**TEMP DROP CODE**

UZNT13 KNHC 061851\
XXAA 56185 99251 70786 08158 99016 26444 18501 00140 26247 07004 92827\
22856 10509 85560 17834 07510 70200 09045 07012 50591 05532 07016 88999\
77999\
61616 AF968 0204A BONNIE OB 04\
62626 RAINBAND SPL 2635N08996W LST WND 001 MBL WND 04010\
XXBB 56188 99251 70786 08158 00016 26444 11005 25841 2291 26657 33860\
18233 44719 10657 55679 07023 66624 03656 77555 01917 88541 02556 99523\
11497 05927\
21212 00016 18501 11983 07510 22959 10010 33865 09511\
44787 06510 55719 08011 66695 06512 77646 08512 88597 07011 99570 03511\
11538 08014 22523 08516 33497 07016\
31313 09608 81828\
51515 10166 02050\
61616 AF968 0204A BONNIE OB 04\
62626 RAINBAND SPL 2635N08996W LST WND 001 MBL WND 04010

**PART ALPHA (A)**

**XXAA** -- Identifier for a temp drop code

**Date/Time Group: YYGGI~d\ ~**

-   Identifier: YY -- Date Group

-   Identifier: GG -- Time Group

-   Identifier: I~d~ - The highest mandatory level for which wind is
    available

**LATTITUDE: 99L~a~L~a~L~a\ ~**

-   Identifier: 99 -- Indicator for data on position follows

-   Identifier: L~a~L~a~L~a~ -- Latitude in tenths of degrees

**LONGITUDE: Q~c~L~o~L~o~L~o~L~o\ ~**

-   Identifier: Q~c~ -- The octant of the globe

-   Identifier: L~o~L~o~L~o~L~o~ -- Longitude in tenths of degrees

**MARSDEN SQUARE:** **MMMU~la~U~lo\ ~**

-   Identifier and explain: MMM -- Marsden square

-   Identifier and explain: U~la~U~lo~ -- Units digits in the reported
    latitude and longitude

**SEA LEVEL PRESSURE: 99P~o~P~o~P~o~ T~o~T~o~T~o~D~o~D~o~
d~o~d~o~f~o~f~o~f~o\ ~**

-   Identifier: 99 -- Indicator for data at the surface level follows

-   Identifier: P~o~P~o~P~o~ -- Indicator for pressure of specified
    levels in whole millibar (thousands digit omitted)

-   Identifier: T~o~T~o~T~o~ -- Tens and digits of air temperature (not
    rounded off) in degrees Celsius, at specified levels beginning with
    surface

-   Identifier: D~o~D~o~ -- Dewpoint depression at standard isobaric
    surfaces beginning with surface level

**[NOTE]{.underline}**

> When the depression is 4.9C or less encode the units and tenths\
> digits of the depression. Encode depressions of 5.0 through 5.4C\
> as 50. Encode depressions of 5.5C through 5.9C as 56. Dew point\
> repressions of 6.0 and above are encoded in tens and units with 50\
> added. Dew point depressions for relative humidities less then 20%\
> are encoded as 80. When air temperature is below --40C report D~a~D~a~
> as //
>
>  

-   Identifier: d~o~d~o~ -- True direction from which the wind is
    blowing rounded to nearest 5 degrees. Report hundreds and tens
    digits. The unit (0 and 5) is added to the hundreds digit of wind.

-   Identifier: f~o~f~o~f~o~ -- Wind speed in knots. Hundreds digit is
    sum of hundreds digit of speed and unit digit of direction. Example:
    295 degrees at 125 knots is encoded as 29625

**STANDARD ISOBARIC SURFACES: P~1~P~1~h~1~h~1~h~1~ T~1~T~1~T~1~D~1~D~1~
d~1~d~1~f~1~f~1~f~1\ ~**

-   Identifier: P~1~P~1~ -- Pressure of standard isobaric surfaces in
    units of tens of millibars. (1000mbs = 00, 925mbs = 92, 850mbs = 85,
    700mbs = 70, 500mbs = 50, 400mbs = 40, 300mbs = 30, 250mbs = 25)

-   Identifier: h~1~h~1~h~1~ -- Heights of the standard pressure level
    in geopotential meters or decameters above the surface. Encoded in
    decameters at and above 500mbs omitting, if necessary, the thousands
    or tens of thousands digits. Add 500 to hhh for negative 1000mb or
    925mb heights. Report 1000mb group as 00/// ///// ///// when
    pressure is less than 950mbs.

-   Identifier: T~1~T~1~T~1~D~1~D~1~ -- Same temperature/dew point
    encoding procedures apply to all levels

-   Identifier: d~1~d~1~f~1~f~1~f~1~ -- Same wind encoding procedures
    apply to all levels

**DATA FOR TROPOPAUSE LEVELS: 88P~n~P~n~P~n~ T~n~T~n~T~n~D~n~D~n~
d~n~d~n~f~n~f~n~f~n\ ~**

-   Identifier: 88 -- Indicator for Tropopause level follows

-   Identifier: P~n~P~n~P~n~ -- Pressure at the tropopause level
    reported in whole millibars. Report 88P~n~P~n~P~n~ as 88999 when
    tropopause is not observed

-   Identifier: T~n~T~n~T~n~D~n~D~n~ -- Same temperature/dew point
    encoding procedures apply

-   Identifier: d~n~d~n~f~n~f~n~f~n~ - Same wind encoding procedures
    apply

**MAXIMUM WIND DATA: 77P~n~P~n~P~n~ d~n~d~n~f~n~f~n~f~n~
4v~b~v~b~v~a~v~a\ ~**

-   Identifier: 77 -- Indicator that data for maximum wind level and for
    vertical wind shear follow when max wind does not coincide at
    flight. If the maximum wind level coincides with flight level encode
    as 66

-   Identifier: P~n~P~n~P~n~ -- Pressure at maximum wind level in whole
    millibars

-   Identifier: d~n~d~n~f~n~f~n~f~n~ -- Same wind encoding procedures
    apply

-   Identifier: 4 -- Data for vertical wind shear follow

-   Identifier: v~b~v~b~ -- Absolute value of vector difference between
    max wind and wind 3000 feet BELOW the level of max wind, reported to
    the nearest knot. Use \"//\" if missing and a 4 is reported. A
    vector difference of 99 knots or more is reported with the code
    figure \"99\".

-   Identifier: v~a~v~a~ -- Absolute value of vector difference between
    max wind and wind 3000 feet ABOVE the level of max wind, reported to
    the nearest knot. Use \"//\" if missing and a 4 is reported. A
    vector difference of 99 knots or more is reported with the code
    figure \"99\".

**AIRCRAFT AND MISSION IDENTIFICATION: 61616 AFXXX XXXXX XXXXX OB X
KXXX**

-   Identifier: 61616 -- Aircraft and mission identification data
    follows

-   Identifier: AFXXX -- The identifier AF for U.S. Air Force and the
    last three digits of the aircraft's tail number

-   Identifier: XXXXX XXXXX -- The identifier for the type of mission
    being flown.

a.  If a training mission the mission identifier is WXWXA TRAIN. The
    fifth letter \"A\" is the only character that could possibly change.
    The \"A\" defining that the flight is in the Atlantic basin. The
    letter \"C\" identifies the Central Pacific area and the letter
    \"E\" identifies the Eastern Pacific.

b.  If an operational storm mission: the first two numbers Identifies
    the number of times an aircraft has flown this system and the second
    two numbers identifies the system number. The last character again
    identifies the basin flown. The name of the storm would replace
    TRAIN. EXAMPLE: AF968 0204A BONNIE -- Aircraft 50968, this was the
    second flight into this system and the system was the fourth of the
    season. The system reached tropical storm strength and was named
    BONNIE.

-   Identifier: OB 04 -- The observation (both vertical and horizontal)
    number as transmitted from the aircraft.

**NATIONALLY DEVELOPED CODES: 62626**

-   Identifier: 62626 -- This is the remarks section. Only the remarks:
    EYE EYEWALL XXX (eyewall will be followed by the radian to the eye
    center procured from the ARWO), or RAINBAND, if release was made in
    a feeder band. The splash location will be recorded automatically by
    computer. Followed by last wind height in meters and the mean
    boundary layer wind with degrees to the nearest five-degree and
    knots.

**PART BRAVO (B)**

-   XXBB -- Identifier for a temp drop code

 

**Date/Time Group: YYGG8**

-   Identifier: YY -- Date Group

-   Identifier: GG -- Time Group

-   Identifier: 8 - Indicator group for the use of satellite navigation
    for windfinding

**LATTITUDE: 99L~a~L~a~L~a\ ~**

-   Identifier: 99 -- Indicator for data on position follows

-   Identifier: L~a~L~a~L~a~ -- Latitude in tenths of degrees

**LONGITUDE: Q~c~L~o~L~o~L~o~L~o\ ~**

-   Identifier: Q~c~ -- The octant of the globe

-   Identifier: L~o~L~o~L~o~L~o~ -- Longitude in tenths of degrees

**MARSDEN SQUARE:** **MMMU~la~U~lo\ ~**

-   Identifier and explain: MMM -- Marsden square

-   Identifier and explain: U~la~U~lo~ -- Units digits in the reported
    latitude and longitude

**SEA LEVEL PRESSURE: 00P~o~P~o~P~o~ T~o~T~o~T~o~D~o~D~o\ ~**

-   Identifier: 00 -- Indicator for data at the surface level follows

-   Identifier: P~o~P~o~P~o~ -- Indicator for pressure of specified
    levels in whole millibars (thousands digit omitted)

-   Identifier: T~o~T~o~T~o~ -- Tens and digits of air temperature (not
    rounded off) in degrees Celsius, at specified levels beginning with
    surface

-   Identifier: D~o~D~o~ -- Dewpoint depression at standard isobaric
    surfaces beginning with surface level

**[NOTE]{.underline}**

> When the depression is 4.9C or less encode the units and tenths\
> digits of the depression. Encode depressions of 5.0 through 5.4C\
> as 50. Encode depressions of 5.5C through 5.9C as 56. Dew point\
> repressions of 6.0 and above are encoded in tens and units with 50\
> added. Dew point depressions for relative humidities less then 20%\
> are encoded as 80. When air temperature is below --40C report D~a~D~a~
> as //

**SIGNIFICANT ISOBARIC LEVELS: n~o~n~o~P~o~P~o~P~o~
T~o~T~o~T~o~D~o~D~o\ ~**

-   Identifier: n~o~n~o~ -- Number of level starting with surface level.
    Only surface will be numbered as \"00\". When a standard level is
    also selected as significant, repeat the level.

-   Identifier: P~o~P~o~P~o~ -- Pressure at specified levels in whole
    millibars.

-   Identifier: T~o~T~o~T~o~D~o~D~o~ -- Same temperature/dew point
    encoding applies.

**SOUNDING SYSTEM INDICATION, RADIOSONDE/SYSTEM STATUS, LAUNCH TIME:
31313 s~r~r~a~r~a~s~a~s~a~ 8GGgg**

-   Identifier: s~r~r~a~r~a~s~a~s~a~ -- Sounding system indicator,
    radiosonde/system status

-   Identifier: s~r~ -- Solar and infrared radiation correction ( 0 --
    no correction)

-   Identifier: r~a~r~a~ -- Radiosonde/sounding system used (96 --
    Descending radiosonde)

-   Identifier: s~a~s~a~ -- Tracking technique/status of system used (08
    -- Automatic satellite navigation)

-   Identifier: 8GGgg -- Launch time

-   Identifier: 8 -- Indicator group

-   Identifier: GG -- Time in hours

-   Identifier: gg -- Time in minutes

**ADDITIONAL DATA GROUPS: 51515 101XX 0P~n~P~n~P~n~P~n\ ~**

-   Identifier: 51515 -- Additional data in regional code follow

-   Identifier: 10166 -- Geopotential data are doubtful between the
    following levels 0P~n~P~n~P~n~P~n.~ This code figure is used only
    when geopotential data are doubtful from one level to another.

-   Identifier: 10167 -- Temperature data are doubtful between the
    following levels 0P~n~P~n~P~n~P~n.~ This code figure shall be
    reported when only the temperature data are doubtful for a portion
    of the descent. If a 10167 group is reported a 10166 will also be
    reported. EXAMPLE: Temperature is doubtful from 540mbs to 510mbs.
    SLP is 1020mbs. The additional data groups would be : 51515 10166
    00251 10167 05451

-   Identifier: 10190 -- Extrapolated altitude data follows:

a.  When the sounding begins within 25mbs below a standard surface, the
    height of the surface is reported in the format 10190
    P~n~P~n~h~n~h~n~h~n~. The temperature group is not reported.
    EXAMPLE: Assume the release was made from 310mbs and the 300mb
    height was 966 decameters. The last reported standard level in Part
    A is the 400mb level. The data for the 300mb level is reported in
    Part A and B as 10190 30966

b.  When the sounding does not reach surface, but terminates within
    25mbs of a standard surface, the height of the standard surface is
    reported in Part A of the code in standard format and also at the
    end of Part A and Part B of the code in the format as 10190
    P~n~P~n~h~n~h~n~h~n.~ EXAMPLE: Assume termination occurred as 980mbs
    and the extrapolated height of the 1000mb level was 115 meters. The
    1000mb level would be reported in Part A of the code as 00115 /////
    ///// and in Part B as 10190 0015.

-   Identifier: 10191 -- Extrapolated surface pressure preceds.
    Extrapolated surface pressure is only reported when the termination
    occurs between 850mbs and the surface. Surface pressure is reported
    in Part A as 99P~o~P~o~P~o~ ///// and in Part B as 00P~o~P~o~P~o~
    /////. When surface pressure is extrapolated the 10191 group is the
    last additional data group reported in Part B.

**61616, 62626 --** Same procedures as Part A