The following differences will exist on 7 November 2007 between the
regulations and/or practices of United States and the provisions of
Annex 3, including Amendment 74

Coding for differences:

A: [Exceeds ICAO SARP]{.underline} in that State requires a higher
standard which effects the operation of aircraft of other Contracting
States

B: [Different in character or other means of compliance]{.underline} in
that National regulations differ in principle, type of system from
corresponding SARP without necessarily imposing an additional obligation

C: [Less protective, partially implemented, or not
implemented]{.underline} in that the national regulation is less
protective than the corresponding SARP or the SARP is not implemented
because no regulation exists.

+---+------+-----+------+-------+-------------+----------+----------+
|   | A    | C   | Sec  | Diffe | Details of  | Remarks  | Ad       |
|   | nnex | hpt |      | rence | Difference  |          | ditional |
|   | P    |     |      | Cat   |             |          | Notes    |
|   | rovi |     |      | egory |             |          |          |
|   | sion |     |      |       |             |          |          |
|   |      |     |      | (A,B, |             |          |          |
|   |      |     |      | C)    |             |          |          |
+---+------+-----+------+-------+-------------+----------+----------+
| 1 | Part | **  | *    | **B** | The United  | NWS      |          |
|   | I    | 2** | *2.1 |       | States has  | Ins      |          |
|   |      |     | .5** |       | its owns    | truction |          |
|   |      |     |      |       | standards   | 20-103   |          |
|   |      |     |      |       | on the      | and      |          |
|   |      |     |      |       | qua         | 20-106   |          |
|   |      |     |      |       | lifications | provides |          |
|   |      |     |      |       | and         | training |          |
|   |      |     |      |       | training of | requ     |          |
|   |      |     |      |       | met         | irements |          |
|   |      |     |      |       | eorological | for NWS  |          |
|   |      |     |      |       | personnel   | meteor   |          |
|   |      |     |      |       | providing   | ologist. |          |
|   |      |     |      |       | service for |          |          |
|   |      |     |      |       | in          |          |          |
|   |      |     |      |       | ternational |          |          |
|   |      |     |      |       | air         |          |          |
|   |      |     |      |       | navigation  |          |          |
+---+------+-----+------+-------+-------------+----------+----------+
| * | **   | **  | **2  | **C** | Untied      |          |          |
| * | [New | 2** | .2** |       | States has  |          |          |
| [ | ]{.u |     |      |       | not         |          |          |
| 2 | nder |     |      |       | instituted  |          |          |
| ] | line |     |      |       | an ISO 9000 |          |          |
| { | }**: |     |      |       | series of   |          |          |
| . | Part |     |      |       | quality     |          |          |
| u | I:   |     |      |       | assurance   |          |          |
| n |      |     |      |       | standards   |          |          |
| d |      |     |      |       |             |          |          |
| e |      |     |      |       |             |          |          |
| r |      |     |      |       |             |          |          |
| l |      |     |      |       |             |          |          |
| i |      |     |      |       |             |          |          |
| n |      |     |      |       |             |          |          |
| e |      |     |      |       |             |          |          |
| } |      |     |      |       |             |          |          |
| * |      |     |      |       |             |          |          |
| * |      |     |      |       |             |          |          |
+---+------+-----+------+-------+-------------+----------+----------+
| 3 | Part | **  | *    | **C** | There are   |          |          |
|   | I:   | 2** | *2.3 |       | no          |          |          |
|   |      |     | .3** |       | provisions  |          |          |
|   |      |     |      |       | to notify   |          |          |
|   |      |     |      |       | the         |          |          |
|   |      |     |      |       | met         |          |          |
|   |      |     |      |       | eorological |          |          |
|   |      |     |      |       | office of   |          |          |
|   |      |     |      |       | flight      |          |          |
|   |      |     |      |       | schedules,  |          |          |
|   |      |     |      |       | delays, or  |          |          |
|   |      |     |      |       | c           |          |          |
|   |      |     |      |       | ancellation |          |          |
|   |      |     |      |       | of flights  |          |          |
+---+------+-----+------+-------+-------------+----------+----------+
|   | ~~   |     |      |       | ~~United    | ~~NWS    |          |
|   | Part |     |      |       | States      | Ins      |          |
|   | I:   |     |      |       | MWO's have  | truction |          |
|   | 3    |     |      |       | no          | 10-811~~ |          |
|   | .4.2 |     |      |       | provision   |          |          |
|   | g)~~ |     |      |       | to supply   |          |          |
|   |      |     |      |       | information |          |          |
|   |      |     |      |       | received    |          |          |
|   |      |     |      |       | concerning  |          |          |
|   |      |     |      |       | the         |          |          |
|   |      |     |      |       | accidental  |          |          |
|   |      |     |      |       | release of  |          |          |
|   |      |     |      |       | radioactive |          |          |
|   |      |     |      |       | material    |          |          |
|   |      |     |      |       | into the    |          |          |
|   |      |     |      |       | atmosphere  |          |          |
|   |      |     |      |       | to          |          |          |
|   |      |     |      |       | associated  |          |          |
|   |      |     |      |       | ACC/FIC.~~  |          |          |
+---+------+-----+------+-------+-------------+----------+----------+
|   | ~~   |     |      |       | ~~U.S. MWOs | ~~NWS    |          |
|   | Part |     |      |       | do not      | Ins      |          |
|   | I:   |     |      |       | supply      | truction |          |
|   | 3    |     |      |       | information | 10-811~~ |          |
|   | .4.2 |     |      |       | on the      |          |          |
|   | g)~~ |     |      |       | location,   |          |          |
|   |      |     |      |       | date, time, |          |          |
|   |      |     |      |       | and         |          |          |
|   |      |     |      |       | forecast    |          |          |
|   |      |     |      |       | t           |          |          |
|   |      |     |      |       | rajectories |          |          |
|   |      |     |      |       | of          |          |          |
|   |      |     |      |       | radioactive |          |          |
|   |      |     |      |       | material    |          |          |
|   |      |     |      |       | released    |          |          |
|   |      |     |      |       | into the    |          |          |
|   |      |     |      |       | at          |          |          |
|   |      |     |      |       | mosphere.~~ |          |          |
+---+------+-----+------+-------+-------------+----------+----------+
| 4 | Part | **  | **4  | **C** | United      | FMH-1    |          |
|   | I:   | 4** | .3.2 |       | States does | Chapter  |          |
|   |      |     | a)** |       | not issue   | 2.5      |          |
|   |      |     |      |       | local       | Types of |          |
|   |      |     |      |       | routine     | Reports  |          |
|   |      |     |      |       | reports or  | provided |          |
|   |      |     |      |       | local       | by the   |          |
|   |      |     |      |       | special     | United   |          |
|   |      |     |      |       | reports.    | States   |          |
+---+------+-----+------+-------+-------------+----------+----------+
| 5 | Part | **  | 4    | **B** | This field  | FMH-1,   |          |
|   | I:   | 4** | .5.1 |       | is also     | Chapter  |          |
|   |      |     | d)   |       | used to     | 12       |          |
|   |      |     | and  |       | denote a    |          |          |
|   |      |     | Part |       | correction  |          |          |
|   |      |     | II:  |       | to the      |          |          |
|   |      |     | App  |       | METAR/SPECI |          |          |
|   |      |     | 3,   |       | by "COR"    |          |          |
|   |      |     | T    |       |             |          |          |
|   |      |     | able |       |             |          |          |
|   |      |     | A    |       |             |          |          |
|   |      |     | 3-2, |       |             |          |          |
|   |      |     | Id   |       |             |          |          |
|   |      |     | enti |       |             |          |          |
|   |      |     | fica |       |             |          |          |
|   |      |     | tion |       |             |          |          |
|   |      |     | of   |       |             |          |          |
|   |      |     | a    |       |             |          |          |
|   |      |     | utom |       |             |          |          |
|   |      |     | ated |       |             |          |          |
|   |      |     | re   |       |             |          |          |
|   |      |     | port |       |             |          |          |
+---+------+-----+------+-------+-------------+----------+----------+
| 6 | Part | **  | 4.6  | **B** | The United  | FMH-1,   |          |
|   | I:   | 4** | .2.1 |       | States      | Chapter  |          |
|   |      |     |      |       | reports     | 6        |          |
|   |      |     |      |       | visibility  |          |          |
|   |      |     |      |       | in statute  |          |          |
|   |      |     |      |       | miles       |          |          |
+---+------+-----+------+-------+-------------+----------+----------+
| 7 | Part | **  | 4.6  | **B** | RVR values  | FMH-1,   |          |
|   | I:   | 4** | .3.3 |       | in the      | Chapter  |          |
|   |      |     |      |       | METAR/SPECI | 7.5.2    |          |
|   |      |     |      |       | code forms  |          |          |
|   |      |     |      |       | are         |          |          |
|   |      |     |      |       | reported in |          |          |
|   |      |     |      |       | feet (FT)   |          |          |
+---+------+-----+------+-------+-------------+----------+----------+
| 8 | Part | **  | 4.6  | **B** | Practice is | FAA      |          |
|   | I:   | 4** | .3.4 |       | to report   | Order    |          |
|   |      |     |      |       | only the    | 7900.5B  |          |
|   |      |     |      |       | touchdown   |          |          |
|   |      |     |      |       | zone in the |          |          |
|   |      |     |      |       | METAR       |          |          |
+---+------+-----+------+-------+-------------+----------+----------+
|   | ~~   |     |      |       | ~~The       | ~~FAA    |          |
|   | Part |     |      |       | following   | Order    |          |
|   | I:   |     |      |       | weather     | 7900.5B, |          |
|   | 4.6  |     |      |       | elements    | Appendix |          |
|   | .4.4 |     |      |       | are         | E~~      |          |
|   | \*~~ |     |      |       | augmented   |          |          |
|   |      |     |      |       | manually at |          |          |
|   |      |     |      |       | designated  |          |          |
|   |      |     |      |       | automated   |          |          |
|   |      |     |      |       | stations    |          |          |
|   |      |     |      |       | observation |          |          |
|   |      |     |      |       | sites: FC,  |          |          |
|   |      |     |      |       | TS, GR, GS, |          |          |
|   |      |     |      |       | and VA. At  |          |          |
|   |      |     |      |       | selected    |          |          |
|   |      |     |      |       | airports,   |          |          |
|   |      |     |      |       | additional  |          |          |
|   |      |     |      |       | present     |          |          |
|   |      |     |      |       | weather     |          |          |
|   |      |     |      |       | elements    |          |          |
|   |      |     |      |       | may be      |          |          |
|   |      |     |      |       | provided.~~ |          |          |
|   |      |     |      |       |             |          |          |
|   |      |     |      |       | ~~With the  |          |          |
|   |      |     |      |       | exception   |          |          |
|   |      |     |      |       | of volcanic |          |          |
|   |      |     |      |       | ash,        |          |          |
|   |      |     |      |       | present     |          |          |
|   |      |     |      |       | weather is  |          |          |
|   |      |     |      |       | reported    |          |          |
|   |      |     |      |       | when        |          |          |
|   |      |     |      |       | prevailing  |          |          |
|   |      |     |      |       | visibility  |          |          |
|   |      |     |      |       | is less     |          |          |
|   |      |     |      |       | than 7      |          |          |
|   |      |     |      |       | statute     |          |          |
|   |      |     |      |       | miles or    |          |          |
|   |      |     |      |       | considered  |          |          |
|   |      |     |      |       | op          |          |          |
|   |      |     |      |       | erationally |          |          |
|   |      |     |      |       | s           |          |          |
|   |      |     |      |       | ignificant. |          |          |
|   |      |     |      |       | Volcanic    |          |          |
|   |      |     |      |       | ash is      |          |          |
|   |      |     |      |       | always      |          |          |
|   |      |     |      |       | reported    |          |          |
|   |      |     |      |       | when        |          |          |
|   |      |     |      |       | observed.~~ |          |          |
+---+------+-----+------+-------+-------------+----------+----------+
| # | #    | **  | 4    | **C** | United      | FMH-1    |          |
|   | Part | 4** | .6.7 |       | States      | Chapter  |          |
| 9 |  I:  |     |      |       | provides    | 11.5.2   |          |
|   |      |     |      |       | atmospheric |          |          |
|   |      |     |      |       | pressure in |          |          |
|   |      |     |      |       | inches of   |          |          |
|   |      |     |      |       | mercury     |          |          |
+---+------+-----+------+-------+-------------+----------+----------+
| # | #    |     |      |       | ~~Practice  | ~~FAA    |          |
|   |  ~~P |     |      |       | is to use   | Order    |          |
|   | art  |     |      |       | AUTO in the | 7        |          |
|   | I: 4 |     |      |       | METAR/SPECI | 900.5B~~ |          |
|   | .7~~ |     |      |       | during      |          |          |
|   |      |     |      |       | operational |          |          |
|   |      |     |      |       | hours of    |          |          |
|   |      |     |      |       | the         |          |          |
|   |      |     |      |       | aerodrome~~ |          |          |
+---+------+-----+------+-------+-------------+----------+----------+
| # | #    | **  | **5  | **B** | Urgent      | FMH-12,  |          |
|   | Part | 5** | .5** |       | Pilot       | Chapter  |          |
| 1 |  I:  |     |      |       | Reports     | 1        |          |
| 0 |      |     |      |       | (UUA) are   |          |          |
|   |      |     |      |       | used in     |          |          |
|   |      |     |      |       | lieu of     |          |          |
|   |      |     |      |       | Special     |          |          |
|   |      |     |      |       | Aircraft    |          |          |
|   |      |     |      |       | ob          |          |          |
|   |      |     |      |       | servations, |          |          |
|   |      |     |      |       | that        |          |          |
|   |      |     |      |       | include     |          |          |
|   |      |     |      |       | Hail (GR,   |          |          |
|   |      |     |      |       | GS) Low     |          |          |
|   |      |     |      |       | Level Wind  |          |          |
|   |      |     |      |       | Shear       |          |          |
|   |      |     |      |       | (within     |          |          |
|   |      |     |      |       | 2000ft of   |          |          |
|   |      |     |      |       | surface)    |          |          |
|   |      |     |      |       | Severe      |          |          |
|   |      |     |      |       | icing,      |          |          |
|   |      |     |      |       | severe      |          |          |
|   |      |     |      |       | extreme     |          |          |
|   |      |     |      |       | turbulence, |          |          |
|   |      |     |      |       | tornado,    |          |          |
|   |      |     |      |       | funnel      |          |          |
|   |      |     |      |       | cloud or    |          |          |
|   |      |     |      |       | water spout |          |          |
|   |      |     |      |       | (FC) and    |          |          |
|   |      |     |      |       | volcanic    |          |          |
|   |      |     |      |       | eruption    |          |          |
|   |      |     |      |       | and/or      |          |          |
|   |      |     |      |       | Volcanic    |          |          |
|   |      |     |      |       | Ash. In     |          |          |
|   |      |     |      |       | addition,   |          |          |
|   |      |     |      |       | Routine     |          |          |
|   |      |     |      |       | Pilot       |          |          |
|   |      |     |      |       | Reports and |          |          |
|   |      |     |      |       | UAA         |          |          |
|   |      |     |      |       | identify    |          |          |
|   |      |     |      |       | the         |          |          |
|   |      |     |      |       | location of |          |          |
|   |      |     |      |       | the weather |          |          |
|   |      |     |      |       | phenomenon  |          |          |
|   |      |     |      |       | by NAVAIDs. |          |          |
+---+------+-----+------+-------+-------------+----------+----------+
| 1 | Part | **  | 6.3  | **B** | Landing and | NWS      |          |
| 1 | I:   | 6** | &    |       | Take-off    | Ins      |          |
|   |      |     | 6.4  |       | forecasts   | truction |          |
|   |      |     |      |       | are         | 10-813   |          |
|   |      |     |      |       | provided by |          |          |
|   |      |     |      |       | the TAF.    |          |          |
|   |      |     |      |       | Select      |          |          |
|   |      |     |      |       | military    |          |          |
|   |      |     |      |       | aerodromes  |          |          |
|   |      |     |      |       | provide     |          |          |
|   |      |     |      |       | temperature |          |          |
|   |      |     |      |       | and lowest  |          |          |
|   |      |     |      |       | altimeter   |          |          |
|   |      |     |      |       | setting.    |          |          |
+---+------+-----+------+-------+-------------+----------+----------+
| # | # *  | **  | *    | **C** | United      |          |          |
|   | *[Ne | 6** | *6.3 |       | States does |          |          |
| * | w]{. |     | .3** |       | not provide |          |          |
| * | unde |     |      |       | trend       |          |          |
| [ | rlin |     |      |       | forecasts   |          |          |
| 1 | e}** |     |      |       |             |          |          |
| 2 | : Pa |     |      |       |             |          |          |
| ] | rt I |     |      |       |             |          |          |
| { |      |     |      |       |             |          |          |
| . |      |     |      |       |             |          |          |
| u |      |     |      |       |             |          |          |
| n |      |     |      |       |             |          |          |
| d |      |     |      |       |             |          |          |
| e |      |     |      |       |             |          |          |
| r |      |     |      |       |             |          |          |
| l |      |     |      |       |             |          |          |
| i |      |     |      |       |             |          |          |
| n |      |     |      |       |             |          |          |
| e |      |     |      |       |             |          |          |
| } |      |     |      |       |             |          |          |
| * |      |     |      |       |             |          |          |
| * |      |     |      |       |             |          |          |
+---+------+-----+------+-------+-------------+----------+----------+
| # | # *  | **  | **6  | **B** | United      | NWSI     |          |
|   | *[Ne | 6** | .6** |       | States      | 10-811   |          |
| * | w]{. |     |      |       | provides an |          |          |
| * | unde |     |      |       | Area        |          |          |
| [ | rlin |     |      |       | Forecast    |          |          |
| 1 | e}** |     |      |       | (FA) in     |          |          |
| 3 | : Pa |     |      |       | place of a  |          |          |
| ] | rt I |     |      |       | GAMET.      |          |          |
| { |      |     |      |       | AIRMETs are |          |          |
| . |      |     |      |       | issued      |          |          |
| u |      |     |      |       | every 6     |          |          |
| n |      |     |      |       | hours.      |          |          |
| d |      |     |      |       |             |          |          |
| e |      |     |      |       | Sp          |          |          |
| r |      |     |      |       | ecifically, |          |          |
| l |      |     |      |       | the FA are  |          |          |
| i |      |     |      |       | issued      |          |          |
| n |      |     |      |       | three times |          |          |
| e |      |     |      |       | a day in    |          |          |
| } |      |     |      |       | the United  |          |          |
| * |      |     |      |       | States,     |          |          |
| * |      |     |      |       | with the    |          |          |
|   |      |     |      |       | exception   |          |          |
|   |      |     |      |       | of Alaska   |          |          |
|   |      |     |      |       | and Hawaii  |          |          |
|   |      |     |      |       | where they  |          |          |
|   |      |     |      |       | are issued  |          |          |
|   |      |     |      |       | four times  |          |          |
|   |      |     |      |       | a day. They |          |          |
|   |      |     |      |       | are valid   |          |          |
|   |      |     |      |       | for a       |          |          |
|   |      |     |      |       | 12-hour     |          |          |
|   |      |     |      |       | period      |          |          |
|   |      |     |      |       | beginning 1 |          |          |
|   |      |     |      |       | hour after  |          |          |
|   |      |     |      |       | issuance    |          |          |
|   |      |     |      |       | and have an |          |          |
|   |      |     |      |       | 18-hour     |          |          |
|   |      |     |      |       | outlook.    |          |          |
+---+------+-----+------+-------+-------------+----------+----------+
| # | #    | **~ | **~  | **~~  | ~~United    | ~~AIP    | We do    |
|   | ~~** | ~7~ | ~7.4 | B~~** | States does | GEN 3.5  | not have |
| * | [New | ~** | ~~** |       | not provide | page 45, | to file  |
| * | ]{.u |     |      |       | wind shear  | Sec      | this     |
| ~ | nder |     |      |       | warnings,   | 24.6.1.7 | dif      |
| ~ | line |     |      |       | but does    | b) wind  | ference. |
| [ | }**: |     |      |       | provide     | shear    | The      |
| 1 |  Par |     |      |       | wind shear  | alerts~~ | s        |
| 4 | t I: |     |      |       | alerts at   |          | tandards |
| ] |  7.4 |     |      |       | selected    |          | states   |
| { | .1~~ |     |      |       | a           |          | that     |
| . |      |     |      |       | erodromes~~ |          | wind     |
| u |      |     |      |       |             |          | shear    |
| n |      |     |      |       |             |          | warning  |
| d |      |     |      |       |             |          | are      |
| e |      |     |      |       |             |          | prepared |
| r |      |     |      |       |             |          | by the   |
| l |      |     |      |       |             |          | WFO      |
| i |      |     |      |       |             |          | de       |
| n |      |     |      |       |             |          | signated |
| e |      |     |      |       |             |          | by the   |
| } |      |     |      |       |             |          | MET      |
| ~ |      |     |      |       |             |          | au       |
| ~ |      |     |      |       |             |          | thority. |
| * |      |     |      |       |             |          | Since    |
| * |      |     |      |       |             |          | the MET  |
|   |      |     |      |       |             |          | A        |
|   |      |     |      |       |             |          | uthority |
|   |      |     |      |       |             |          | has      |
|   |      |     |      |       |             |          | never    |
|   |      |     |      |       |             |          | directed |
|   |      |     |      |       |             |          | the NWS  |
|   |      |     |      |       |             |          | to issue |
|   |      |     |      |       |             |          | a wind   |
|   |      |     |      |       |             |          | shear    |
|   |      |     |      |       |             |          | warning  |
|   |      |     |      |       |             |          | we are   |
|   |      |     |      |       |             |          | in       |
|   |      |     |      |       |             |          | co       |
|   |      |     |      |       |             |          | mpliance |
|   |      |     |      |       |             |          | with the |
|   |      |     |      |       |             |          | s        |
|   |      |     |      |       |             |          | tandard. |
+---+------+-----+------+-------+-------------+----------+----------+
| # | # ~  |     |      | **~~  | ~~AIRMETS   | ~~NWS    |          |
|   | ~Par |     |      | B~~** | are issued  | Ins      |          |
|   | t I: |     |      |       | on a        | truction |          |
|   |  7.2 |     |      |       | scheduled   | 10-811~~ |          |
|   | .3~~ |     |      |       | basis every |          |          |
|   |      |     |      |       | 6 hours~~   |          |          |
+---+------+-----+------+-------+-------------+----------+----------+
|   | **   | **  | *    | **C** | United      |          |          |
|   | [New | 9** | *9.3 |       | States      |          |          |
|   | ]{.u |     | .3** |       | met         |          |          |
|   | nder |     |      |       | eorological |          |          |
|   | line |     |      |       | offices     |          |          |
|   | }**: |     |      |       | have no     |          |          |
|   | Part |     |      |       | means to    |          |          |
|   | I:   |     |      |       | communicate |          |          |
|   |      |     |      |       | directly to |          |          |
|   |      |     |      |       | flight      |          |          |
|   |      |     |      |       | crews if    |          |          |
|   |      |     |      |       | there is a  |          |          |
|   |      |     |      |       | divergence  |          |          |
|   |      |     |      |       | in the      |          |          |
|   |      |     |      |       | forecast    |          |          |
|   |      |     |      |       | from what   |          |          |
|   |      |     |      |       | is provided |          |          |
|   |      |     |      |       | in the      |          |          |
|   |      |     |      |       | flight      |          |          |
|   |      |     |      |       | document    |          |          |
|   |      |     |      |       | folder      |          |          |
+---+------+-----+------+-------+-------------+----------+----------+
| 1 | Part | **  | **2  | **B** | The United  | FMH-1,   |          |
| 5 | II:  | App | .2** |       | States does | Chapter  |          |
|   |      | 3** |      |       | not use the | 9        |          |
|   |      |     |      |       | term CAVOK  |          |          |
|   |      |     |      |       | in          |          |          |
|   |      |     |      |       | met         |          |          |
|   |      |     |      |       | eorological |          |          |
|   |      |     |      |       | reports.    |          |          |
+---+------+-----+------+-------+-------------+----------+----------+
|   | ~~   |     |      | **~~  | ~~Practices | ~~FMH-1, | This is  |
|   | Part |     |      | B~~** | do not      | Chapter  | only     |
|   | II:  |     |      |       | require a   | 2.5.2~~  | ap       |
|   | App  |     |      |       | SPECI for   |          | plicable |
|   | 3,   |     |      |       | changes in  |          | to local |
|   | 2    |     |      |       | air         |          | reports, |
|   | .3.1 |     |      |       | tem         |          | should   |
|   | c)~~ |     |      |       | perature.~~ |          | not have |
|   |      |     |      |       |             |          | been     |
|   |      |     |      |       |             |          | filed in |
|   |      |     |      |       |             |          | the      |
|   |      |     |      |       |             |          | first    |
|   |      |     |      |       |             |          | place    |
+---+------+-----+------+-------+-------------+----------+----------+
| 1 | Part | **  | **2  | **B** | Practices   | FMH-1    |          |
| 6 | II:  | App | .3.2 |       | require     | Chapter  |          |
|   |      | 3** | a)** |       | SPECI for   | 2.5.2    |          |
|   |      |     |      |       | wind shift  |          |          |
|   |      |     |      |       | when wind   |          |          |
|   |      |     |      |       | direction   |          |          |
|   |      |     |      |       | changes by  |          |          |
|   |      |     |      |       | 45 degrees  |          |          |
|   |      |     |      |       | or more in  |          |          |
|   |      |     |      |       | less than   |          |          |
|   |      |     |      |       | 15 minutes  |          |          |
|   |      |     |      |       | and the     |          |          |
|   |      |     |      |       | wind speed  |          |          |
|   |      |     |      |       | is 10 knots |          |          |
|   |      |     |      |       | or more     |          |          |
|   |      |     |      |       | throughout  |          |          |
|   |      |     |      |       | the wind    |          |          |
|   |      |     |      |       | shift.      |          |          |
+---+------+-----+------+-------+-------------+----------+----------+
| 1 | Part | **  | **2  | **B** | Practices   | FMH-1,   |          |
| 7 | II:  | App | .3.2 |       | do not      | Chapter  |          |
|   |      | 3** | b)** |       | require     | 2.5.2    |          |
|   |      |     |      |       | SPECI for   |          |          |
|   |      |     |      |       | increases   |          |          |
|   |      |     |      |       | of mean     |          |          |
|   |      |     |      |       | surface     |          |          |
|   |      |     |      |       | wind speed. |          |          |
+---+------+-----+------+-------+-------------+----------+----------+
| 1 | Part | **  | **2  | **B** | Practices   | FMH-1,   | We       |
| 8 | II:  | App | .3.2 |       | require     | Chapters | should   |
|   |      | 3** | c)** |       | SPECI for   | 2.5.2    | remove   |
|   |      |     |      |       | squall,     | and      | this     |
|   |      |     |      |       | where       | 8.3.3    | from     |
|   |      |     |      |       | squall is   |          | FMH-1 as |
|   |      |     |      |       | defined as  |          | I doubt  |
|   |      |     |      |       | a strong    |          | that     |
|   |      |     |      |       | wind        |          | ASOS     |
|   |      |     |      |       | ch          |          | provides |
|   |      |     |      |       | aracterized |          | this     |
|   |      |     |      |       | by a sudden |          | unless   |
|   |      |     |      |       | onset in    |          | it is    |
|   |      |     |      |       | which the   |          | entered  |
|   |      |     |      |       | wind speed  |          | through  |
|   |      |     |      |       | increases   |          | augm     |
|   |      |     |      |       | at least 16 |          | entation |
|   |      |     |      |       | knots and   |          |          |
|   |      |     |      |       | is          |          |          |
|   |      |     |      |       | sustained   |          |          |
|   |      |     |      |       | at least 22 |          |          |
|   |      |     |      |       | knots or    |          |          |
|   |      |     |      |       | more for at |          |          |
|   |      |     |      |       | least one   |          |          |
|   |      |     |      |       | minute.     |          |          |
+---+------+-----+------+-------+-------------+----------+----------+
| 1 | Part | **  | **2  | **B** | Practices   | FMH-1    |          |
| 9 | II:  | App | .3.2 |       | do not      | Chapter  |          |
|   |      | 3\  | d)** |       | require     | 2.5.2    |          |
|   |      | **  |      |       | SPECI for   |          |          |
|   |      |     |      |       | wind        |          |          |
|   |      |     |      |       | direction   |          |          |
|   |      |     |      |       | changes     |          |          |
|   |      |     |      |       | based on    |          |          |
|   |      |     |      |       | local       |          |          |
|   |      |     |      |       | criteria.   |          |          |
+---+------+-----+------+-------+-------------+----------+----------+
| 2 | Part | **  | **2  | **B** | SPECI not   | FMH-1,   |          |
| 0 | II:  | App | .3.2 |       | prepared    | Chapter  |          |
|   |      | 3** | f)** |       | for the     | 2.5.2    |          |
|   |      |     |      |       | equivalents |          |          |
|   |      |     |      |       | in feet of  | SPECI is |          |
|   |      |     |      |       | 150, 350,   | made     |          |
|   |      |     |      |       | or 600      | when the |          |
|   |      |     |      |       | meters.     | highest  |          |
|   |      |     |      |       | United      | value    |          |
|   |      |     |      |       | States      | from the |          |
|   |      |     |      |       | military    | de       |          |
|   |      |     |      |       | stations    | signated |          |
|   |      |     |      |       | may not     | RVR      |          |
|   |      |     |      |       | report a    | runway   |          |
|   |      |     |      |       | SPECI based | d        |          |
|   |      |     |      |       | on RVR.     | ecreases |          |
|   |      |     |      |       |             | to less  |          |
|   |      |     |      |       |             | than, or |          |
|   |      |     |      |       |             | if       |          |
|   |      |     |      |       |             | below,   |          |
|   |      |     |      |       |             | i        |          |
|   |      |     |      |       |             | ncreases |          |
|   |      |     |      |       |             | to equal |          |
|   |      |     |      |       |             | or       |          |
|   |      |     |      |       |             | exceed   |          |
|   |      |     |      |       |             | 2,400    |          |
|   |      |     |      |       |             | feet     |          |
|   |      |     |      |       |             | during   |          |
|   |      |     |      |       |             | the      |          |
|   |      |     |      |       |             | p        |          |
|   |      |     |      |       |             | receding |          |
|   |      |     |      |       |             | 10       |          |
|   |      |     |      |       |             | minutes. |          |
+---+------+-----+------+-------+-------------+----------+----------+
|   | ~~   |     |      | **~~  | ~~Practices | ~~FMH-1, | Removing |
|   | Part |     |      | B~~** | do not      | Chapter  | this     |
|   | II:  |     |      |       | require     | 2.5.2~~  | since    |
|   | App  |     |      |       | SPECI for   |          | AUTO     |
|   | 3,   |     |      |       | the onset,  | ~~SPECI  | MET      |
|   | 2    |     |      |       | cessation   | is made  | AR/SPECI |
|   | .3.2 |     |      |       | or change   | when     | are not  |
|   | g)\* |     |      |       | in          | re       | re       |
|   | and  |     |      |       | intensity   | ferenced | cognized |
|   | h)   |     |      |       | of:         | weather  | and dust |
|   | \*~~ |     |      |       | freezing    | p        | storms,  |
|   |      |     |      |       | fog;        | henomena | etc are  |
|   |      |     |      |       | moderate or | cause    | not part |
|   |      |     |      |       | heavy       | changes  | of an    |
|   |      |     |      |       | pr          | in the   | a        |
|   |      |     |      |       | ecipitation | vis      | utomated |
|   |      |     |      |       | (including  | ibility, | system   |
|   |      |     |      |       | showers     | ceiling, | report.  |
|   |      |     |      |       | thereof);   | sky      |          |
|   |      |     |      |       | low         | co       |          |
|   |      |     |      |       | drifting    | ndition, |          |
|   |      |     |      |       | dust, sand  | freezing |          |
|   |      |     |      |       | or snow;    | precip   |          |
|   |      |     |      |       | blowing     | itatinon |          |
|   |      |     |      |       | dust, sand  | (i       |          |
|   |      |     |      |       | or snow     | ncluding |          |
|   |      |     |      |       | (including  | int      |          |
|   |      |     |      |       | snowstorm); | ensity), |          |
|   |      |     |      |       | duststorm;  | hail,    |          |
|   |      |     |      |       | or          | ice      |          |
|   |      |     |      |       | s           | p        |          |
|   |      |     |      |       | andstorm.~~ | ellets~~ |          |
+---+------+-----+------+-------+-------------+----------+----------+
| 2 | Part | **  | *    | **A** | United      | FMH-1    |          |
| 1 | II   | App | *2.3 |       | States      | Chapter  |          |
|   |      | 3** | .2.2 |       | provides a  | 2.5.2    |          |
|   |      |     | i)   |       | SPECI when  |          |          |
|   |      |     | and  |       | layer of    | SPECI is |          |
|   |      |     | j)** |       | clouds or   | made     |          |
|   |      |     |      |       | o           | when the |          |
|   |      |     |      |       | bscurations | ceiling  |          |
|   |      |     |      |       | aloft is    | (rounded |          |
|   |      |     |      |       | present     | off to   |          |
|   |      |     |      |       | below 1000  | re       |          |
|   |      |     |      |       | ft and no   | portable |          |
|   |      |     |      |       | layer aloft | values)  |          |
|   |      |     |      |       | was         | forms or |          |
|   |      |     |      |       | reported    | di       |          |
|   |      |     |      |       | below 1000  | ssipates |          |
|   |      |     |      |       | ft in the   | below,   |          |
|   |      |     |      |       | preceding   | d        |          |
|   |      |     |      |       | report.     | ecreases |          |
|   |      |     |      |       | Also a      | to less  |          |
|   |      |     |      |       | SPECI is    | than, or |          |
|   |      |     |      |       | reported    | if       |          |
|   |      |     |      |       | when the    | below,   |          |
|   |      |     |      |       | ceiling     | i        |          |
|   |      |     |      |       | decreases   | ncreases |          |
|   |      |     |      |       | or          | to equal |          |
|   |      |     |      |       | increases   | or       |          |
|   |      |     |      |       | at these    | exceed:  |          |
|   |      |     |      |       | markers     | 3,000    |          |
|   |      |     |      |       | 3000, 1500, | feet;    |          |
|   |      |     |      |       | 1000, 500ft | 1,500    |          |
|   |      |     |      |       | or lowest   | feet;    |          |
|   |      |     |      |       | published   | 1,000    |          |
|   |      |     |      |       | instrument  | feet;    |          |
|   |      |     |      |       | approach    | 500      |          |
|   |      |     |      |       | procedures  | feet,    |          |
|   |      |     |      |       |             | the      |          |
|   |      |     |      |       |             | lowest   |          |
|   |      |     |      |       |             | standard |          |
|   |      |     |      |       |             | in       |          |
|   |      |     |      |       |             | strument |          |
|   |      |     |      |       |             | approach |          |
|   |      |     |      |       |             | p        |          |
|   |      |     |      |       |             | rocedure |          |
|   |      |     |      |       |             | minimum  |          |
|   |      |     |      |       |             | p        |          |
|   |      |     |      |       |             | ublished |          |
|   |      |     |      |       |             | in the   |          |
|   |      |     |      |       |             | National |          |
|   |      |     |      |       |             | Ocean    |          |
|   |      |     |      |       |             | Survey   |          |
|   |      |     |      |       |             | (NOS)    |          |
|   |      |     |      |       |             | *U.S.    |          |
|   |      |     |      |       |             | Terminal |          |
|   |      |     |      |       |             | Proc     |          |
|   |      |     |      |       |             | edures.* |          |
|   |      |     |      |       |             | If none  |          |
|   |      |     |      |       |             | pu       |          |
|   |      |     |      |       |             | blished, |          |
|   |      |     |      |       |             | then 200 |          |
|   |      |     |      |       |             | feet.    |          |
+---+------+-----+------+-------+-------------+----------+----------+
| 2 | Part | **  | **4  | **B** | The United  | FAA      |          |
| 2 | II:  | App | .1.2 |       | States does | Order    |          |
|   |      | 3** | .1** |       | not provide | 7900.5B  |          |
|   |      |     |      |       | wind for    | Par 3.3  |          |
|   |      |     |      |       | specific    |          |          |
|   |      |     |      |       | runways but |          |          |
|   |      |     |      |       | wind        |          |          |
|   |      |     |      |       | rep         |          |          |
|   |      |     |      |       | resentative |          |          |
|   |      |     |      |       | for the     |          |          |
|   |      |     |      |       | airport.    |          |          |
+---+------+-----+------+-------+-------------+----------+----------+
| 2 | Part | **  | *    | **B** | United      | FMH-1,   |          |
| 3 | II:  | App | *4.1 |       | States      | Chapter  |          |
|   |      | 3** | .3.1 |       | provides a  | 5.       |          |
|   |      |     | b)** |       | 2-minute    |          |          |
|   |      |     |      |       | average     |          |          |
|   |      |     |      |       | wind        |          |          |
|   |      |     |      |       | observation |          |          |
|   |      |     |      |       | for the     |          |          |
|   |      |     |      |       | METAR/SPECI |          |          |
+---+------+-----+------+-------+-------------+----------+----------+
| 2 | Part | **  | *    | **B** | The wind    | FMH-1,   |          |
| 4 | II   | App | *4.1 |       | direction   | Chapter  |          |
|   |      | 3** | .4.2 |       | may be      | 5.       |          |
|   |      |     | b)** |       | considered  |          |          |
|   |      |     |      |       | variable    |          |          |
|   |      |     |      |       | if, during  |          |          |
|   |      |     |      |       | the 2-min   |          |          |
|   |      |     |      |       | evaluation  |          |          |
|   |      |     |      |       | period, the |          |          |
|   |      |     |      |       | wind speed  |          |          |
|   |      |     |      |       | is 6 KT or  |          |          |
|   |      |     |      |       | less. Also, |          |          |
|   |      |     |      |       | the wind    |          |          |
|   |      |     |      |       | direction   |          |          |
|   |      |     |      |       | shall be    |          |          |
|   |      |     |      |       | considered  |          |          |
|   |      |     |      |       | variable,   |          |          |
|   |      |     |      |       | if during   |          |          |
|   |      |     |      |       | the 2-min   |          |          |
|   |      |     |      |       | evaluation  |          |          |
|   |      |     |      |       | period, it  |          |          |
|   |      |     |      |       | varies by   |          |          |
|   |      |     |      |       | 60 deg or   |          |          |
|   |      |     |      |       | more when   |          |          |
|   |      |     |      |       | the wind    |          |          |
|   |      |     |      |       | speed is    |          |          |
|   |      |     |      |       | greater     |          |          |
|   |      |     |      |       | than 6 KTs. |          |          |
+---+------+-----+------+-------+-------------+----------+----------+
| 2 | Part | **  | *    | **B** | United      | FMH-1,   |          |
| 5 | II:  | App | *4.1 |       | States      | Chapter  |          |
|   |      | 3** | .4.2 |       | practices   | 5.4.4    |          |
|   |      |     | c)** |       | define wind |          |          |
|   |      |     |      |       | gust as     |          |          |
|   |      |     |      |       | rapid       |          |          |
|   |      |     |      |       | f           |          |          |
|   |      |     |      |       | luctuations |          |          |
|   |      |     |      |       | in wind     |          |          |
|   |      |     |      |       | speed with  |          |          |
|   |      |     |      |       | a variation |          |          |
|   |      |     |      |       | of 10 knots |          |          |
|   |      |     |      |       | or more     |          |          |
|   |      |     |      |       | between     |          |          |
|   |      |     |      |       | peaks and   |          |          |
|   |      |     |      |       | lulls. Wind |          |          |
|   |      |     |      |       | speed data  |          |          |
|   |      |     |      |       | for the     |          |          |
|   |      |     |      |       | most recent |          |          |
|   |      |     |      |       | 10 minutes  |          |          |
|   |      |     |      |       | is examined |          |          |
|   |      |     |      |       | and a gust, |          |          |
|   |      |     |      |       | the maximum |          |          |
|   |      |     |      |       | in          |          |          |
|   |      |     |      |       | stantaneous |          |          |
|   |      |     |      |       | wind speed  |          |          |
|   |      |     |      |       | during that |          |          |
|   |      |     |      |       | 10-minute   |          |          |
|   |      |     |      |       | period, is  |          |          |
|   |      |     |      |       | reported if |          |          |
|   |      |     |      |       | the         |          |          |
|   |      |     |      |       | definition  |          |          |
|   |      |     |      |       | above is    |          |          |
|   |      |     |      |       | met during  |          |          |
|   |      |     |      |       | that        |          |          |
|   |      |     |      |       | period.     |          |          |
+---+------+-----+------+-------+-------------+----------+----------+
| * | *    | **  | **4  | **C** | United      | FMH-1    |          |
| * | *[Ne | App | .2.4 |       | States does | Chapter  |          |
| [ | w]{. | 3** | .5** |       | not use     | 12       |          |
| 2 | unde |     |      |       | "NDV", no   |          |          |
| 6 | rlin |     |      |       | direction   |          |          |
| ] | e}** |     |      |       | variations  |          |          |
| { | Part |     |      |       | can be      |          |          |
| . | II:  |     |      |       | given for   |          |          |
| u |      |     |      |       | visiblity   |          |          |
| n |      |     |      |       |             |          |          |
| d |      |     |      |       |             |          |          |
| e |      |     |      |       |             |          |          |
| r |      |     |      |       |             |          |          |
| l |      |     |      |       |             |          |          |
| i |      |     |      |       |             |          |          |
| n |      |     |      |       |             |          |          |
| e |      |     |      |       |             |          |          |
| } |      |     |      |       |             |          |          |
| * |      |     |      |       |             |          |          |
| * |      |     |      |       |             |          |          |
+---+------+-----+------+-------+-------------+----------+----------+
| * | *    | **  | 4.3  |       |             | [Need to | [        |
| * | *[Ne | App | .6.1 |       |             | verify   | ]{.mark} |
| [ | w]{. | 3** |      |       |             | if we    |          |
| 2 | unde |     |      |       |             | round    |          |
| 7 | rlin |     |      |       |             | down for |          |
| ] | e}** |     |      |       |             | RVR      |          |
| { | Part |     |      |       |             | re       |          |
| . | II:  |     |      |       |             | porting] |          |
| u | App  |     |      |       |             | {.mark}. |          |
| n | 3,   |     |      |       |             |          |          |
| d | 4.3  |     |      |       |             |          |          |
| e | .6.1 |     |      |       |             |          |          |
| r |      |     |      |       |             |          |          |
| l |      |     |      |       |             |          |          |
| i |      |     |      |       |             |          |          |
| n |      |     |      |       |             |          |          |
| e |      |     |      |       |             |          |          |
| } |      |     |      |       |             |          |          |
| * |      |     |      |       |             |          |          |
| * |      |     |      |       |             |          |          |
+---+------+-----+------+-------+-------------+----------+----------+
| 2 | Part | *   | **4  | **B** | United      | FMH-1,   |          |
| 8 | II:  | *Ap | .3.6 |       | States      | Chapter  |          |
|   |      | p** | .1** |       | reports RVR | 7.5.2    |          |
|   |      |     |      |       | in          |          |          |
|   |      | **  |      |       | increments  |          |          |
|   |      | 3** |      |       | of 100 feet |          |          |
|   |      |     |      |       | up to 1,000 |          |          |
|   |      |     |      |       | feet,       |          |          |
|   |      |     |      |       | increments  |          |          |
|   |      |     |      |       | of 200 feet |          |          |
|   |      |     |      |       | from 1,000  |          |          |
|   |      |     |      |       | feet to     |          |          |
|   |      |     |      |       | 3,000 feet, |          |          |
|   |      |     |      |       | and         |          |          |
|   |      |     |      |       | increments  |          |          |
|   |      |     |      |       | of 500 feet |          |          |
|   |      |     |      |       | above 3,000 |          |          |
|   |      |     |      |       | feet to     |          |          |
|   |      |     |      |       | 6,000 feet. |          |          |
+---+------+-----+------+-------+-------------+----------+----------+
| 2 | Part | **  | *    | **B** | United      | FAA      |          |
| 9 | II:  | App | *4.3 |       | States      | Order    |          |
|   |      | 3** | .6.5 |       | reports RVR | 7900.5B  |          |
|   |      |     | b)   |       | for a       |          |          |
|   |      |     | and  |       | single      |          |          |
|   |      |     | 4    |       | designated  |          |          |
|   |      |     | .3.6 |       | runway in   |          |          |
|   |      |     | .6** |       | the         |          |          |
|   |      |     |      |       | M           |          |          |
|   |      |     |      |       | ETAR/SPECI. |          |          |
|   |      |     |      |       | RVR         |          |          |
|   |      |     |      |       | tendency is |          |          |
|   |      |     |      |       | not         |          |          |
|   |      |     |      |       | reported    |          |          |
+---+------+-----+------+-------+-------------+----------+----------+
|   | ~~   |     |      |       | ~~The       | ~~FAA    | With the |
|   | Part |     |      |       | practice is | Order    | ac       |
|   | II:  |     |      |       | to not      | 7900.5A, | ceptance |
|   | App  |     |      |       | report the  | Appendix | of       |
|   | 3,   |     |      |       | following   | E and    | a        |
|   | 4.4  |     |      |       | weather     | system   | utomated |
|   | .2.3 |     |      |       | phenomena   | capabi   | reports  |
|   | \*~~ |     |      |       | at          | lities~~ | this     |
|   |      |     |      |       | unstaffed   |          | di       |
|   |      |     |      |       | stations in |          | fference |
|   |      |     |      |       | METAR or    |          | can be   |
|   |      |     |      |       | SPECI: DZ,  |          | removed. |
|   |      |     |      |       | PL, IC, SG, |          |          |
|   |      |     |      |       | GR, GS, SA, |          |          |
|   |      |     |      |       | DU, FU, VA, |          |          |
|   |      |     |      |       | PY, PO, SQ, |          |          |
|   |      |     |      |       | FC, DS and  |          |          |
|   |      |     |      |       | SS.~~       |          |          |
+---+------+-----+------+-------+-------------+----------+----------+
|   | ~~   |     |      |       | ~~The       | ~~FAA    | With the |
|   | Part |     |      |       | practice is | 7900.5A, | ac       |
|   | II:  |     |      |       | to not      | Appendix | ceptance |
|   | App  |     |      |       | report the  | E and    | of       |
|   | 3,   |     |      |       | following   | system   | a        |
|   | 4.4  |     |      |       | char        | capabi   | utomated |
|   | .2.4 |     |      |       | acteristics | lities~~ | reports  |
|   | \*~~ |     |      |       | of present  |          | this     |
|   |      |     |      |       | weather     |          | di       |
|   |      |     |      |       | phenomena   |          | fference |
|   |      |     |      |       | in METAR or |          | can be   |
|   |      |     |      |       | SPECI: SH,  |          | removed  |
|   |      |     |      |       | DR, MI, BC  |          |          |
|   |      |     |      |       | and PR at   |          |          |
|   |      |     |      |       | unstaffed   |          |          |
|   |      |     |      |       | stations.~~ |          |          |
+---+------+-----+------+-------+-------------+----------+----------+
| 3 | Part | **  | **4  | **B** | The         | FMH-1,   |          |
| 0 | II:  | App | .4.2 |       | practice    | Chapters |          |
|   |      | 3** | .5** |       | with        | 8.4.1    |          |
|   |      |     |      |       | respect to  | and      |          |
|   |      |     |      |       | the         | 8.5.1    |          |
|   |      |     |      |       | proximity   |          |          |
|   |      |     |      |       | indicator   |          |          |
|   |      |     |      |       | VC is       |          |          |
|   |      |     |      |       | between 5   |          |          |
|   |      |     |      |       | to 10       |          |          |
|   |      |     |      |       | statute     |          |          |
|   |      |     |      |       | miles from  |          |          |
|   |      |     |      |       | the         |          |          |
|   |      |     |      |       | ***point of |          |          |
|   |      |     |      |       | obs         |          |          |
|   |      |     |      |       | ervation*** |          |          |
|   |      |     |      |       | with the    |          |          |
|   |      |     |      |       | exception   |          |          |
|   |      |     |      |       | of          |          |          |
|   |      |     |      |       | pr          |          |          |
|   |      |     |      |       | ecipitation |          |          |
|   |      |     |      |       | for which   |          |          |
|   |      |     |      |       | the VC      |          |          |
|   |      |     |      |       | indicates   |          |          |
|   |      |     |      |       | \>0 to 10   |          |          |
|   |      |     |      |       | statute     |          |          |
|   |      |     |      |       | miles from  |          |          |
|   |      |     |      |       | the point   |          |          |
|   |      |     |      |       | of          |          |          |
|   |      |     |      |       | o           |          |          |
|   |      |     |      |       | bservation. |          |          |
+---+------+-----+------+-------+-------------+----------+----------+
|   | Part | **  | *    | **B** | The United  | FMH 1,   | This     |
|   | II   | App | *4.5 |       | States      | Chapter  | should   |
|   |      | 3** | .4** |       | reports     | 9.5.2    | be       |
|   |      |     |      |       | only up to  |          | verified |
|   |      |     |      |       | 3 layers at |          | for ASOS |
|   |      |     |      |       | automated   |          |          |
|   |      |     |      |       | sites and   |          |          |
|   |      |     |      |       | up to 6     |          |          |
|   |      |     |      |       | layers at   |          |          |
|   |      |     |      |       | manual      |          |          |
|   |      |     |      |       | sites.      |          |          |
|   |      |     |      |       | Cloud layer |          |          |
|   |      |     |      |       | amounts are |          |          |
|   |      |     |      |       | a summation |          |          |
|   |      |     |      |       | of layers   |          |          |
|   |      |     |      |       | at or below |          |          |
|   |      |     |      |       | a given     |          |          |
|   |      |     |      |       | level,      |          |          |
|   |      |     |      |       | utilizing   |          |          |
|   |      |     |      |       | cumulative  |          |          |
|   |      |     |      |       | cloud       |          |          |
|   |      |     |      |       | amount. In  |          |          |
|   |      |     |      |       | addition,   |          |          |
|   |      |     |      |       | at          |          |          |
|   |      |     |      |       | automated   |          |          |
|   |      |     |      |       | sites,      |          |          |
|   |      |     |      |       | which are   |          |          |
|   |      |     |      |       | unstaffed,  |          |          |
|   |      |     |      |       | cloud       |          |          |
|   |      |     |      |       | layers      |          |          |
|   |      |     |      |       | about       |          |          |
|   |      |     |      |       | 12,000 ft   |          |          |
|   |      |     |      |       | are not     |          |          |
|   |      |     |      |       | reported.   |          |          |
|   |      |     |      |       | At staffed  |          |          |
|   |      |     |      |       | automated   |          |          |
|   |      |     |      |       | sites,      |          |          |
|   |      |     |      |       | clouds      |          |          |
|   |      |     |      |       | above       |          |          |
|   |      |     |      |       | 12,000 ft   |          |          |
|   |      |     |      |       | may be      |          |          |
|   |      |     |      |       | augmented.  |          |          |
|   |      |     |      |       | CAVOK, SKC, |          |          |
|   |      |     |      |       | and NSC are |          |          |
|   |      |     |      |       | not used.   |          |          |
|   |      |     |      |       | In addition |          |          |
|   |      |     |      |       | the United  |          |          |
|   |      |     |      |       | States does |          |          |
|   |      |     |      |       | not use     |          |          |
|   |      |     |      |       | "///" when  |          |          |
|   |      |     |      |       | cloud type  |          |          |
|   |      |     |      |       | can not be  |          |          |
|   |      |     |      |       | observed;   |          |          |
|   |      |     |      |       | "NCD" when  |          |          |
|   |      |     |      |       | no clouds   |          |          |
|   |      |     |      |       | are         |          |          |
|   |      |     |      |       | detected;   |          |          |
|   |      |     |      |       | "//////"    |          |          |
|   |      |     |      |       | for CB or   |          |          |
|   |      |     |      |       | TCU are not |          |          |
|   |      |     |      |       | detected by |          |          |
|   |      |     |      |       | automated   |          |          |
|   |      |     |      |       | observing   |          |          |
|   |      |     |      |       | systems.    |          |          |
|   |      |     |      |       |             |          |          |
|   |      |     |      |       | In United   |          |          |
|   |      |     |      |       | States the  |          |          |
|   |      |     |      |       | symbol      |          |          |
|   |      |     |      |       | "///" when  |          |          |
|   |      |     |      |       | used in the |          |          |
|   |      |     |      |       | cloud       |          |          |
|   |      |     |      |       | section of  |          |          |
|   |      |     |      |       | the METAR   |          |          |
|   |      |     |      |       | refers to a |          |          |
|   |      |     |      |       | mountain    |          |          |
|   |      |     |      |       | station     |          |          |
|   |      |     |      |       | where the   |          |          |
|   |      |     |      |       | layer is    |          |          |
|   |      |     |      |       | below the   |          |          |
|   |      |     |      |       | station     |          |          |
|   |      |     |      |       | level. See  |          |          |
|   |      |     |      |       | par 4.9.1.4 |          |          |
|   |      |     |      |       | on its use  |          |          |
|   |      |     |      |       | in Annex 3. |          |          |
+---+------+-----+------+-------+-------------+----------+----------+
| 3 | Part | **  | **4  | **B** | The United  | FMH --1  |          |
| 1 | II   | App | .8** |       | States has  | Chapter  |          |
|   |      | 3** |      |       | a Remarks   | 12.      |          |
|   |      |     |      |       | Section     |          |          |
|   |      |     |      |       | that        |          |          |
|   |      |     |      |       | provides    |          |          |
|   |      |     |      |       | similar     |          |          |
|   |      |     |      |       | i           |          |          |
|   |      |     |      |       | nformation. |          |          |
+---+------+-----+------+-------+-------------+----------+----------+
| 3 | Part | **  | **4  | **B** | Wind shear  | FMH-1    |          |
| 2 | II:  | App | .8.1 |       | is not      | Chapter  |          |
|   |      | 3** | .3** |       | included in | 12       |          |
|   |      |     |      |       | the         |          |          |
|   |      |     |      |       | METAR/SPECI |          |          |
|   |      |     |      |       | code form   |          |          |
|   |      |     |      |       | in the U.S  |          |          |
|   |      |     |      |       | remarks.    |          |          |
+---+------+-----+------+-------+-------------+----------+----------+
| 3 | Part | **  | **4  | **B** | Sea-surface | FMH-1    |          |
| 3 | II:  | App | .8.1 |       | t           | Chapter  |          |
|   |      | 3** | .4** |       | emperature, | 12       |          |
|   |      |     |      |       | the state   |          |          |
|   |      |     |      |       | of the sea  |          |          |
|   |      |     |      |       | and state   |          |          |
|   |      |     |      |       | of the      |          |          |
|   |      |     |      |       | runway are  |          |          |
|   |      |     |      |       | not         |          |          |
|   |      |     |      |       | provided in |          |          |
|   |      |     |      |       | the         |          |          |
|   |      |     |      |       | METAR/SPECI |          |          |
|   |      |     |      |       | code form   |          |          |
|   |      |     |      |       | in the U.S. |          |          |
|   |      |     |      |       | remarks.    |          |          |
+---+------+-----+------+-------+-------------+----------+----------+
|   | ~~   |     |      |       | ~~The term  | ~~FMH-1  | Do       |
|   | Part |     |      |       | no          | Chapter  | cumented |
|   | II:  |     |      |       | directional | 12~~     | pr       |
|   | App  |     |      |       | variations  |          | eviously |
|   | 3,   |     |      |       | (NDV) is    |          | no need  |
|   | 4.9  |     |      |       | not used.~~ |          | to       |
|   | .1.2 |     |      |       |             |          | repeat   |
|   | \*~~ |     |      |       |             |          | it       |
+---+------+-----+------+-------+-------------+----------+----------+
|   | ~~   |     |      |       | ~~The       | ~~FMH-1  | Do       |
|   | Part |     |      |       | symbol      | Chapter  | cumented |
|   | II:  |     |      |       | "///" when  | 12~~     | pr       |
|   | App  |     |      |       | used in the |          | eviously |
|   | 3,   |     |      |       | cloud       |          | no need  |
|   | 4.9  |     |      |       | section of  |          | to       |
|   | .1.4 |     |      |       | the METAR   |          | repeat   |
|   | \*~~ |     |      |       | refers to a |          | it       |
|   |      |     |      |       | mountain    |          |          |
|   |      |     |      |       | station     |          |          |
|   |      |     |      |       | where the   |          |          |
|   |      |     |      |       | layer is    |          |          |
|   |      |     |      |       | below the   |          |          |
|   |      |     |      |       | station     |          |          |
|   |      |     |      |       | level.      |          |          |
|   |      |     |      |       | "NCD" when  |          |          |
|   |      |     |      |       | no clouds   |          |          |
|   |      |     |      |       | can be      |          |          |
|   |      |     |      |       | observed is |          |          |
|   |      |     |      |       | not used.~~ |          |          |
+---+------+-----+------+-------+-------------+----------+----------+
| # | #    | **  | *    | **C** | The United  | NWSI     |          |
|   | Part | App | *3.1 |       | States MWOs | 10-811   |          |
| 3 |  II: | 4** | .4** |       | do not      |          |          |
| 4 |      |     |      |       | issue       |          |          |
|   |      |     |      |       | special air |          |          |
|   |      |     |      |       | reports     |          |          |
+---+------+-----+------+-------+-------------+----------+----------+
|   | ~~   | *   | **~  | **~~  | ~~At        |          | Want to  |
|   | Part | *~~ | ~1.1 | A~~** | selected    |          | remove   |
|   | II:  | App | ~~** |       | military    |          | this     |
|   | App  | 5   |      |       | aerodromes  |          | since it |
|   | 5,   | \`~ |      |       | practices   |          | is not   |
|   | 1    | ~** |      |       | are to      |          | part of  |
|   | .1~~ |     |      |       | forecast    |          | the TAF  |
|   |      |     |      |       | for the 5   |          | t        |
|   |      |     |      |       | and 6       |          | emplate. |
|   |      |     |      |       | groups,     |          | Check    |
|   |      |     |      |       | turbulence  |          | with     |
|   |      |     |      |       | and icing   |          | Tagg     |
|   |      |     |      |       | and the     |          | Timm     |
|   |      |     |      |       | lowest      |          |          |
|   |      |     |      |       | expected    |          |          |
|   |      |     |      |       | altimeter   |          |          |
|   |      |     |      |       | setting.~~  |          |          |
+---+------+-----+------+-------+-------------+----------+----------+
|   | ~~   |     |      | **~~  | ~~Area      | ~~NWS    | Includes |
|   | Part |     |      | B~~** | forecasts   | Ins      | this     |
|   | II:  |     |      |       | (FA) are    | truction | above    |
|   | App  |     |      |       | issued      | 10-811~~ | when     |
|   | 5,   |     |      |       | three times |          | comment  |
|   | 5    |     |      |       | a day in    |          | is made  |
|   | .1~~ |     |      |       | the United  |          | that     |
|   |      |     |      |       | States,     |          | U.S.     |
|   |      |     |      |       | with the    |          | does not |
|   |      |     |      |       | exception   |          | provide  |
|   |      |     |      |       | of Alaska   |          | a GAMET  |
|   |      |     |      |       | and Hawaii  |          | but a FA |
|   |      |     |      |       | where they  |          |          |
|   |      |     |      |       | are issued  |          |          |
|   |      |     |      |       | four times  |          |          |
|   |      |     |      |       | a day. They |          |          |
|   |      |     |      |       | are valid   |          |          |
|   |      |     |      |       | for a       |          |          |
|   |      |     |      |       | 12-hour     |          |          |
|   |      |     |      |       | period      |          |          |
|   |      |     |      |       | beginning 1 |          |          |
|   |      |     |      |       | hour after  |          |          |
|   |      |     |      |       | issuance    |          |          |
|   |      |     |      |       | and have an |          |          |
|   |      |     |      |       | 18-hour     |          |          |
|   |      |     |      |       | outlook.    |          |          |
|   |      |     |      |       | Area        |          |          |
|   |      |     |      |       | Forecasts   |          |          |
|   |      |     |      |       | are not     |          |          |
|   |      |     |      |       | issued in   |          |          |
|   |      |     |      |       | the GAMET   |          |          |
|   |      |     |      |       | format, but |          |          |
|   |      |     |      |       | are in      |          |          |
|   |      |     |      |       | abbreviated |          |          |
|   |      |     |      |       | language.~~ |          |          |
+---+------+-----+------+-------+-------------+----------+----------+
|   | ~~   | **~ | *    | **~~  | ~~Practice  | ~~NWS    | This can |
|   | Part | ~5~ | *~~1 | B~~** | is to       | Ins      | be       |
|   | II:  | ~** | .2.1 |       | report      | truction | removed  |
|   | App  |     | ~~** |       | 00000KT for | 10-813~~ | since    |
|   | 5,   |     |      |       | calm        |          | the      |
|   | 1    |     |      |       | winds~~     |          | template |
|   | .2.1 |     |      |       |             |          | for the  |
|   | \*~~ |     |      |       |             |          | TAF      |
|   |      |     |      |       |             |          | format   |
|   |      |     |      |       |             |          | gives    |
|   |      |     |      |       |             |          | this as  |
|   |      |     |      |       |             |          | an       |
|   |      |     |      |       |             |          | example. |
+---+------+-----+------+-------+-------------+----------+----------+
| 3 | Part | **  | *    | **B** | Forecast    | NWS      |          |
| 5 | II:  | App | *1.2 |       | visibility  | Ins      |          |
|   |      | 5** | .2** |       | increments  | truction |          |
|   |      |     |      |       | used        | 10-813   |          |
|   |      |     |      |       | consist of  |          |          |
|   |      |     |      |       | 1/4 mile    |          |          |
|   |      |     |      |       | from 0      |          |          |
|   |      |     |      |       | (zero) to 1 |          |          |
|   |      |     |      |       | mile, 1/2   |          |          |
|   |      |     |      |       | mile from 1 |          |          |
|   |      |     |      |       | to 2 miles, |          |          |
|   |      |     |      |       | and 1 mile  |          |          |
|   |      |     |      |       | above 2     |          |          |
|   |      |     |      |       | miles.      |          |          |
|   |      |     |      |       | Note: miles |          |          |
|   |      |     |      |       | are statute |          |          |
|   |      |     |      |       | miles.      |          |          |
+---+------+-----+------+-------+-------------+----------+----------+
| 3 | Part | **  | *    | **B** | Practices   | NWS      |          |
| 6 | II:  | App | *1.2 |       | require     | Ins      |          |
|   |      | 5** | .3** |       | forecast of | truction |          |
|   |      |     |      |       | non         | 10-813   |          |
|   |      |     |      |       | -convective |          |          |
|   |      |     |      |       | low-level   | The      |          |
|   |      |     |      |       | wind shear  | forecast |          |
|   |      |     |      |       | within      | consists |          |
|   |      |     |      |       | 2,000 feet  | of WS    |          |
|   |      |     |      |       | of the      | (wind    |          |
|   |      |     |      |       | ground in   | shear);  |          |
|   |      |     |      |       | the         | height   |          |
|   |      |     |      |       | Optional    | of the   |          |
|   |      |     |      |       | Group.      | wind     |          |
|   |      |     |      |       |             | shear in |          |
|   |      |     |      |       |             | hundreds |          |
|   |      |     |      |       |             | of feet; |          |
|   |      |     |      |       |             | and wind |          |
|   |      |     |      |       |             | speed    |          |
|   |      |     |      |       |             | and      |          |
|   |      |     |      |       |             | d        |          |
|   |      |     |      |       |             | irection |          |
|   |      |     |      |       |             | above    |          |
|   |      |     |      |       |             | the wind |          |
|   |      |     |      |       |             | shear    |          |
|   |      |     |      |       |             | height,  |          |
|   |      |     |      |       |             | using    |          |
|   |      |     |      |       |             | METAR    |          |
|   |      |     |      |       |             | and TAF  |          |
|   |      |     |      |       |             | coding   |          |
|   |      |     |      |       |             | regu     |          |
|   |      |     |      |       |             | lations. |          |
+---+------+-----+------+-------+-------------+----------+----------+
| 3 | Part | **  | *    | **C** | The United  | NWS      | While we |
| 7 | II:  | App | *1.2 |       | States does | Ins      | have     |
|   |      | 5** | .4** |       | not use     | truction | already  |
|   |      |     |      |       | CAVOK and   | 10-813   | do       |
|   |      |     |      |       | NSC in the  |          | cumented |
|   |      |     |      |       | TAF.        |          | this     |
|   |      |     |      |       |             |          | above    |
|   |      |     |      |       |             |          | for the  |
|   |      |     |      |       |             |          | METAR I  |
|   |      |     |      |       |             |          | believe  |
|   |      |     |      |       |             |          | we have  |
|   |      |     |      |       |             |          | to       |
|   |      |     |      |       |             |          | repeat   |
|   |      |     |      |       |             |          | this for |
|   |      |     |      |       |             |          | the TAF  |
+---+------+-----+------+-------+-------------+----------+----------+
| 3 | Part | **  | **1  | **B** | Change      | NWS      |          |
| 8 | II:  | App | .3.1 |       | groups and  | Ins      |          |
|   |      | 5** | b)** |       | amendment   | truction |          |
|   |      |     |      |       | criteria    | 10-813   |          |
|   |      |     |      |       | below 1/2   |          |          |
|   |      |     |      |       | statute     |          |          |
|   |      |     |      |       | mile (800   |          |          |
|   |      |     |      |       | meters) are |          |          |
|   |      |     |      |       | not used.   |          |          |
+---+------+-----+------+-------+-------------+----------+----------+
| 3 | Part | **  | **1  | **B** | The 100     | NWS      |          |
| 9 | II   | App | .3.1 |       | foot (30    | Ins      |          |
|   |      | 5** | e)** |       | meter)      | truction |          |
|   |      |     |      |       | change      | 10-813   |          |
|   |      |     |      |       | group and   |          |          |
|   |      |     |      |       | amendment   |          |          |
|   |      |     |      |       | criterion   |          |          |
|   |      |     |      |       | is not      |          |          |
|   |      |     |      |       | used.       |          |          |
+---+------+-----+------+-------+-------------+----------+----------+
| # | # P  | **  | *    | **B** | The United  | NWS      |          |
|   | art  | App | *1.3 |       | States does | Ins      |          |
| 4 | II:  | 5** | .3** |       | not use the | truction |          |
| 0 |      |     |      |       | change      | 10-813   |          |
|   |      |     |      |       | indicator   |          |          |
|   |      |     |      |       | "BECMG"     |          |          |
+---+------+-----+------+-------+-------------+----------+----------+
| 4 | Part | **  | **1  | **B** | The United  | NWS      |          |
| 1 | II   | App | .4** |       | States does | Ins      |          |
|   |      | 5** |      |       | not use     | truction |          |
|   |      |     |      |       | "PROB 40"   | 10-813   |          |
|   |      |     |      |       | in the TAF. |          |          |
|   |      |     |      |       | "PROB 30"   |          |          |
|   |      |     |      |       | will not be |          |          |
|   |      |     |      |       | used in the |          |          |
|   |      |     |      |       | first nine  |          |          |
|   |      |     |      |       | (9) hours   |          |          |
|   |      |     |      |       | of every    |          |          |
|   |      |     |      |       | TAF's valid |          |          |
|   |      |     |      |       | period,     |          |          |
|   |      |     |      |       | including   |          |          |
|   |      |     |      |       | amendments. |          |          |
|   |      |     |      |       | Military    |          |          |
|   |      |     |      |       | TAFs do not |          |          |
|   |      |     |      |       | use the     |          |          |
|   |      |     |      |       | "PROB"      |          |          |
|   |      |     |      |       | groups.     |          |          |
+---+------+-----+------+-------+-------------+----------+----------+
|   | ~~   | *   | **~  | **~~  | ~~Area      | ~~NWS    | As we    |
|   | Part | *~~ | ~5.1 | B~~** | forecasts   | Ins      | have     |
|   | II:  | App | ~~** |       | (FA) are    | truction | already  |
|   | App  | 5~  |      |       | issued      | 10-811~~ | do       |
|   | 5,   | ~** |      |       | three times |          | cumented |
|   | 5    |     |      |       | a day in    |          | that we  |
|   | .1~~ |     |      |       | the United  |          | do not   |
|   |      |     |      |       | States,     |          | provide  |
|   |      |     |      |       | with the    |          | a GAMET  |
|   |      |     |      |       | exception   |          | there is |
|   |      |     |      |       | of Alaska   |          | no       |
|   |      |     |      |       | and Hawaii  |          | reason   |
|   |      |     |      |       | where they  |          | to       |
|   |      |     |      |       | are issued  |          | repeat   |
|   |      |     |      |       | four times  |          | this     |
|   |      |     |      |       | a day. They |          | dif      |
|   |      |     |      |       | are valid   |          | ference. |
|   |      |     |      |       | for a       |          |          |
|   |      |     |      |       | 12-hour     |          |          |
|   |      |     |      |       | period      |          |          |
|   |      |     |      |       | beginning 1 |          |          |
|   |      |     |      |       | hour after  |          |          |
|   |      |     |      |       | issuance    |          |          |
|   |      |     |      |       | and have an |          |          |
|   |      |     |      |       | 18-hour     |          |          |
|   |      |     |      |       | outlook.    |          |          |
|   |      |     |      |       | Area        |          |          |
|   |      |     |      |       | Forecasts   |          |          |
|   |      |     |      |       | are not     |          |          |
|   |      |     |      |       | issued in   |          |          |
|   |      |     |      |       | the GAMET   |          |          |
|   |      |     |      |       | format, but |          |          |
|   |      |     |      |       | are in      |          |          |
|   |      |     |      |       | abbreviated |          |          |
|   |      |     |      |       | language.~~ |          |          |
+---+------+-----+------+-------+-------------+----------+----------+
| 4 | Part | **  | *    | **B** | Practice is | NWS      |          |
| 2 | II:  | App | *5.1 |       | not to      | Ins      |          |
|   |      | 5** | j)** |       | include     | truction |          |
|   |      |     |      |       | th          | 10-811   |          |
|   |      |     |      |       | understorms |          |          |
|   |      |     |      |       | information |          |          |
|   |      |     |      |       | in Areas    |          |          |
|   |      |     |      |       | Forecasts.  |          |          |
+---+------+-----+------+-------+-------------+----------+----------+
| 4 | Part | **  | *    | **B** | SIGMET      | NWS      |          |
| 3 | II:  | App | *1.1 |       | messages    | Ins      |          |
|   | App  | 6** | .3** |       | are issued  | truction |          |
|   | 6,   |     |      |       | by          | 10-811   |          |
|   | 1    |     |      |       | a           |          |          |
|   | .1.3 |     |      |       | lphanumeric |          |          |
|   |      |     |      |       | series,     |          |          |
|   |      |     |      |       | e.g. Kilo   |          |          |
|   |      |     |      |       | 1,2,3 etc.  |          |          |
|   |      |     |      |       | In          |          |          |
|   |      |     |      |       | c           |          |          |
|   |      |     |      |       | onterminous |          |          |
|   |      |     |      |       | U.S.        |          |          |
|   |      |     |      |       | convective  |          |          |
|   |      |     |      |       | SIGMETs are |          |          |
|   |      |     |      |       | issued in   |          |          |
|   |      |     |      |       | lieu of     |          |          |
|   |      |     |      |       | SIGMETS for |          |          |
|   |      |     |      |       | convection. |          |          |
|   |      |     |      |       | They are    |          |          |
|   |      |     |      |       | issued as   |          |          |
|   |      |     |      |       | hourly as   |          |          |
|   |      |     |      |       | bulletins   |          |          |
|   |      |     |      |       | for East,   |          |          |
|   |      |     |      |       | Central,    |          |          |
|   |      |     |      |       | and Western |          |          |
|   |      |     |      |       | United      |          |          |
|   |      |     |      |       | States thus |          |          |
|   |      |     |      |       | they do not |          |          |
|   |      |     |      |       | indicate    |          |          |
|   |      |     |      |       | the FIR.    |          |          |
|   |      |     |      |       | Connective  |          |          |
|   |      |     |      |       | SIGMETs     |          |          |
|   |      |     |      |       | have an     |          |          |
|   |      |     |      |       | outlook     |          |          |
|   |      |     |      |       | section.    |          |          |
+---+------+-----+------+-------+-------------+----------+----------+
| 4 | Part | **  | *    | **B** | SIGMETs     | NWS      |          |
| 4 | II:  | App | *1.1 |       | issued for  | Ins      |          |
|   |      | 6** | .4** |       | c           | truction |          |
|   |      |     |      |       | onterminous | 10-811   |          |
|   |      |     |      |       | U.S. for    |          |          |
|   |      |     |      |       | convection  |          |          |
|   |      |     |      |       | includes    |          |          |
|   |      |     |      |       | convection  |          |          |
|   |      |     |      |       | at levels   |          |          |
|   |      |     |      |       | lower than  |          |          |
|   |      |     |      |       | the         |          |          |
|   |      |     |      |       | criterion   |          |          |
|   |      |     |      |       | in a)       |          |          |
|   |      |     |      |       | below, are  |          |          |
|   |      |     |      |       | issued as   |          |          |
|   |      |     |      |       | bulletins   |          |          |
|   |      |     |      |       | hourly      |          |          |
|   |      |     |      |       | including   |          |          |
|   |      |     |      |       | \"NIL\"     |          |          |
|   |      |     |      |       | when        |          |          |
|   |      |     |      |       | required.   |          |          |
|   |      |     |      |       | Connective  |          |          |
|   |      |     |      |       | SIGMETs for |          |          |
|   |      |     |      |       | the         |          |          |
|   |      |     |      |       | c           |          |          |
|   |      |     |      |       | onterminous |          |          |
|   |      |     |      |       | U.S. are    |          |          |
|   |      |     |      |       | issued with |          |          |
|   |      |     |      |       | the         |          |          |
|   |      |     |      |       | n           |          |          |
|   |      |     |      |       | on-standard |          |          |
|   |      |     |      |       | WMO Header  |          |          |
|   |      |     |      |       | designator  |          |          |
|   |      |     |      |       | \"WST\".    |          |          |
|   |      |     |      |       | Practices   |          |          |
|   |      |     |      |       | is to issue |          |          |
|   |      |     |      |       | SIGMET for  |          |          |
|   |      |     |      |       | mountain    |          |          |
|   |      |     |      |       | wave only   |          |          |
|   |      |     |      |       | when        |          |          |
|   |      |     |      |       | accompanied |          |          |
|   |      |     |      |       | severe      |          |          |
|   |      |     |      |       | turbulence. |          |          |
+---+------+-----+------+-------+-------------+----------+----------+
| 4 | Part | **  | **2  | **B** | AIRMETs in  | NWS      |          |
| 5 | II:  | App | .1.2 |       | the         | Ins      |          |
|   |      | 6** | and  |       | c           | truction |          |
|   |      |     | 2.1  |       | onterminous | 10-811   |          |
|   |      |     | .3** |       | U.S. are    |          |          |
|   |      |     |      |       | issued as   |          |          |
|   |      |     |      |       | bulletins   |          |          |
|   |      |     |      |       | for East,   |          |          |
|   |      |     |      |       | West, and   |          |          |
|   |      |     |      |       | Central in  |          |          |
|   |      |     |      |       | conjunction |          |          |
|   |      |     |      |       | with area   |          |          |
|   |      |     |      |       | forecast    |          |          |
|   |      |     |      |       | turbulence, |          |          |
|   |      |     |      |       | icing, and  |          |          |
|   |      |     |      |       | ceiling and |          |          |
|   |      |     |      |       | visibility, |          |          |
|   |      |     |      |       | thus do not |          |          |
|   |      |     |      |       | comply with |          |          |
|   |      |     |      |       | template    |          |          |
|   |      |     |      |       | for FIR or  |          |          |
|   |      |     |      |       | series      |          |          |
|   |      |     |      |       | numbering   |          |          |
|   |      |     |      |       | format.     |          |          |
+---+------+-----+------+-------+-------------+----------+----------+
| 4 | Part | **  | *    | **B** | AIRMET in   | NWS      |          |
| 6 | II:  | App | *2.1 |       | the         | Ins      |          |
|   | App  | 6** | .4** |       | c           | truction |          |
|   | 6,   |     |      |       | onterminous | 10-811   |          |
|   | 2    |     |      |       | on a        |          |          |
|   | .1.4 |     |      |       | routine     | The      |          |
|   |      |     |      |       | schedule    | United   |          |
|   |      |     |      |       | for icing,  | States   |          |
|   |      |     |      |       | turbulence, | issues   |          |
|   |      |     |      |       | sustained   | AIRMET   |          |
|   |      |     |      |       | surface     | denoting |          |
|   |      |     |      |       | winds,      | areas of |          |
|   |      |     |      |       | ceiling     | IFR and  |          |
|   |      |     |      |       | /visibility | MVFR     |          |
|   |      |     |      |       | and         | based on |          |
|   |      |     |      |       | convection. | either   |          |
|   |      |     |      |       | Practices   | ceiling  |          |
|   |      |     |      |       | do not      | or       |          |
|   |      |     |      |       | include use | vi       |          |
|   |      |     |      |       | of ISOL,    | sibility |          |
|   |      |     |      |       | OCNL. Or    | c        |          |
|   |      |     |      |       | FRQ.        | riteria. |          |
+---+------+-----+------+-------+-------------+----------+----------+
| * | **   | **  | **6  | **C** | United      | FAA      |          |
| * | [New | App | .2** |       | States does | Order    |          |
| [ | ]{.u | 6** |      |       | not issue   | 7110.10  |          |
| 4 | nder |     |      |       | wind shear  |          |          |
| 7 | line |     |      |       | warnings,   |          |          |
| ] | }**: |     |      |       | but does    |          |          |
| { | Part |     |      |       | provide     |          |          |
| . | II:  |     |      |       | wind shear  |          |          |
| u |      |     |      |       | alert at    |          |          |
| n |      |     |      |       | selected    |          |          |
| d |      |     |      |       | aerodromes  |          |          |
| e |      |     |      |       |             |          |          |
| r |      |     |      |       |             |          |          |
| l |      |     |      |       |             |          |          |
| i |      |     |      |       |             |          |          |
| n |      |     |      |       |             |          |          |
| e |      |     |      |       |             |          |          |
| } |      |     |      |       |             |          |          |
| * |      |     |      |       |             |          |          |
| * |      |     |      |       |             |          |          |
+---+------+-----+------+-------+-------------+----------+----------+
| 4 | Part | **[ | 4.3  | **B** | Practices   | The      | Ron      |
| 8 | II:  | App | .1.1 |       | do require  | United   | needs to |
|   |      | 8   | and  |       | reporting   | States   | verify   |
|   |      | ]{. | 4.3  |       | of ISOL,    | reports  |          |
|   |      | und | .1.3 |       | OCNL or     | isolated |          |
|   |      | erl |      |       | FREQ in     | (ISOL)   |          |
|   |      | ine |      |       | accordance  | to mean  |          |
|   |      | }** |      |       | with the    | the      |          |
|   |      |     |      |       | guidance on | ph       |          |
|   |      |     |      |       | the use of  | enomenon |          |
|   |      |     |      |       | the terms   | affects  |          |
|   |      |     |      |       | given in    | an area  |          |
|   |      |     |      |       | Attachment  | less     |          |
|   |      |     |      |       | F.          | than     |          |
|   |      |     |      |       |             | appro    |          |
|   |      |     |      |       |             | ximately |          |
|   |      |     |      |       |             | 3,000    |          |
|   |      |     |      |       |             | square   |          |
|   |      |     |      |       |             | miles or |          |
|   |      |     |      |       |             | are      |          |
|   |      |     |      |       |             | widely   |          |
|   |      |     |      |       |             | s        |          |
|   |      |     |      |       |             | eparated |          |
|   |      |     |      |       |             | in time, |          |
|   |      |     |      |       |             | and      |          |
|   |      |     |      |       |             | wi       |          |
|   |      |     |      |       |             | despread |          |
|   |      |     |      |       |             | (WDSPR)  |          |
|   |      |     |      |       |             | to mean  |          |
|   |      |     |      |       |             | more     |          |
|   |      |     |      |       |             | than 50  |          |
|   |      |     |      |       |             | percent  |          |
|   |      |     |      |       |             | of area. |          |
+---+------+-----+------+-------+-------------+----------+----------+

3\. By the dates indicated below, The United States will have complied
with the provisions of Annex 3, including all the amendments up to and
including Amendment 74 for which differences have been notified in 2
above

  -------------------- -------------------- -----------------------------
  Annex Provision      Date                 Comment

  Part I: 3.4.2 g)     7 November 2007      U.S. will provide information
                                            concerning accidental release
                                            of radioactive material into
                                            the atmosphere in the area
                                            for which it maintains watch
                                            or adjacent areas to its
                                            associated ACC/FIC in the
                                            form of a SIGMET

  Part I: 4.6.4.4\*    7 November 2007      U.S. provides present weather
                                            as defined as being minimum
                                            standard of precipitation and
                                            freezing precipitation
                                            (including intensity
                                            thereof), fog, freezing fog
                                            and thunderstorms (including
                                            thunderstorms in the
                                            vicinity)

  Part I: 4.7.1        7 November 2007      U.S. provides auto METAR as
                                            determined by the MET
                                            Authority

  Part II: Appx 3 2.32 7 November 2007      U.S. provides SPECIs for
  g) --h)                                   change or intensity of
                                            operationally significant
                                            present weather that includes
                                            freezing precip,
                                            thunderstorms, heavy rain,
                                            hail, or any other
                                            meteorological situation in
                                            the opinion of contract
                                            weather observer is critical

  ~~Part II: App 3,    7 November 2007      The practice is to not report
  4.4.2.4 \*~~                              the following characteristics
                                            of present weather phenomena
                                            in METAR or SPECI: SH, DR,
                                            MI, BC and PR at unstaffed
                                            stations. METAR or SPECI with
                                            AUTO provide the present
                                            weather in compliance with
                                            Annex 3.

  Part II: App 5, 1.1  7 November 2007      At selected military
                                            aerodromes practices are to
                                            forecast for the 5 and 6
                                            groups, turbulence and icing
                                            and the lowest expected
                                            altimeter setting.

  Part II: App 5,      7 November 2007      Practice is to report 00000KT
  1.2.1                                     for calm winds

                                            

                                            

                                            

                                            
  -------------------- -------------------- -----------------------------