Publication: Magyar Közlöny
Issue: MK-2009-104 (Year: 2009, Number: 104)
Era: 2004-2010
Section: 
Paragraph Index: 667

5. USE OF AERONAUTICAL BROADCASTING SERVICE — VOLMET BROADCASTS 5.1 Detailed content of meteorological information to be included in VOLMET broadcasts 5.1.1 The aerodromes for which METAR, SPECI and TAF are to be included in VOLMET broadcasts, the sequence in which they are to be transmitted and the broadcast time shall be determined by regional air navigation agreement. 5.1.2 The flight information regions for which SIGMET messages are to be included in scheduled VOLMET broadcasts shall be determined by regional air navigation agreement. Where this is done, the SIGMET message shall be transmitted at the beginning of the broadcast or of a five-minute time block. 5.2 Criteria related to information to be included in VOLMET broadcasts 5.2.1 Recommendation.— When a report has not arrived from an aerodrome in time for a broadcast, the latest available report should be included in the broadcast, together with the time of observation. 5.2.2 Recommendation.— TAF included in scheduled VOLMET broadcasts should be amended as necessary to ensure that a forecast, when transmitted, reflects the latest opinion of the meteorological office concerned. 5.2.3 Recommendation.— Where SIGMET messages are included in scheduled VOLMET broadcasts, an indication of “NIL SIGMET” should be transmitted if no SIGMET message is valid for the flight information regions concerned. Appendix 10 Annex 3 — Meteorological Service for International Air Navigation APP 10-5 7/11/07 5.3 Format of information to be included in VOLMET broadcasts 5.3.1 The content and format of reports, forecasts and SIGMET information included in VOLMET broadcasts shall be consistent with the provisions of Chapters 4, 6 and 7 of this Annex. 5.3.2 Recommendation.— VOLMET broadcasts should use standard radiotelephony phraseologies. Note.— Guidance on the standard radiotelephony phraseologies to be used in VOLMET broadcasts is given in the Manual on Coordination between Air Traffic Services, Aeronautical Information Services and Aeronautical Meteorological Services (Doc 9377), Appendix 1. ___________________ ANNEX 3 ATT A-1 7/11/07 ATTACHMENT A. OPERATIONALLY DESIRABLE ACCURACY OF MEASUREMENT OR OBSERVATION Note.— The guidance contained in this table relates to Chapter 4 — Meteorological observations and reports, in particular to 4.1.9. Element to be observed Operationally desirable accuracy of measurement or observation* Mean surface wind Direction: ± 10° Speed: ± 2 km/h (1 kt) up to 20 km/h (10 kt) ± 10% above 20 km/h (10 kt) Variations from the mean surface wind ± 4 km/h (2 kt), in terms of longitudinal and lateral components Visibility ± 50 m up to 600 m ± 10% between 600 m and 1 500 m ± 20% above 1 500 m Runway visual range ± 10 m up to 400 m ± 25 m between 400 m and 800 m ± 10% above 800 m Cloud amount ± 1 okta Cloud height ± 10 m (33 ft) up to 100 m (330 ft) ± 10% above 100 m (330 ft) Air temperature and dew-point temperature ± 1°C Pressure value (QNH, QFE) ± 0.5 hPa * The operationally desirable accuracy is not intended as an operational requirement; it is to be understood as a goal that has been expressed by the operators. Note.— Guidance on the uncertainties of measurement or observation can be found in WMO Publication No. 8 — Guide to Meteorological Instruments and Methods of Observation. ___________________ ANNEX 3 ATT B-1 7/11/07 ATTACHMENT B. OPERATIONALLY DESIRABLE ACCURACY OF FORECASTS Note 1.— The guidance contained in this table relates to Chapter 6 — Forecasts, in particular to 6.1.1. Note 2.— If the accuracy of the forecasts remains within the operationally desirable range shown in the second column, for the percentage of cases indicated in the third column, the effect of forecast errors is not considered serious in comparison with the effects of navigational errors and of other operational uncertainties. Element to be forecast Operationally desirable accuracy of forecasts Minimum percentage of cases within range TAF Wind direction ± 20° 80% of cases Wind speed ± 10 km/h (5 kt) 80% of cases Visibility ± 200 m up to 800 m ± 30% between 800 m and 10 km 80% of cases Precipitation Occurrence or non-occurrence 80% of cases Cloud amount One category below 450 m (1 500 ft) Occurrence or non-occurrence of BKN or OVC between 450 m (1 500 ft) and 3 000 m (10 000 ft) 70% of cases Cloud height ± 30 m (100 ft) up to 300 m (1 000 ft) ± 30% between 300 m (1 000 ft) and 3 000 m (10 000 ft) 70% of cases Air temperature ± 1°C 70% of cases TREND FORECAST Wind direction ± 20° 90% of cases Wind speed ± 10 km/h (5 kt) 90% of cases Visibility ± 200 m up to 800 m ± 30% between 800 m and 10 km 90% of cases Precipitation Occurrence or non-occurrence 90% of cases Annex 3 — Meteorological Service for International Air Navigation Attachment B 7/11/07 ATT B-2 Element to be forecast Operationally desirable accuracy of forecasts Minimum percentage of cases within range Cloud amount ± One category below 450 m (1 500 ft) Occurrence or non-occurrence of BKN or OVC between 450 m (1 500 ft) and 3 000 m (10 000 ft) 90% of cases Cloud height ± 30 m (100 ft) up to 300 m (1 000 ft) ± 30% between 300 m (1 000 ft) and 3 000 m (10 000 ft) 90% of cases FORECAST FOR TAKE-OFF Wind direction ± 20° 90% of cases Wind speed ± 10 km/h (5 kt) up to 50 km/h (25 kt) 90% of cases Air temperature ± 1°C 90% of cases Pressure value (QNH) ± 1 hPa 90% of cases AREA, FLIGHT AND ROUTE FORECASTS Upper-air temperature ± 2°C (Mean for 900 km (500 NM) 90% of cases Relative humidity ± 20% 90% of cases Upper wind ± 20 km/h (10 kt) (Modulus of vector difference for 900 km (500 NM) 90% of cases Significant en-route weather phenomena and cloud Occurrence or non-occurrence Location: ± 100 km (60 NM Vertical extent: ± 300 m (1 000 ft) Flight level of tropopause: ± 300 m (1 000 ft) Max wind level: ± 300 m (1 000 ft) 80% of cases 70% of cases 70% of cases 80% of cases 80% of cases ___________________ ANNEX 3 ATT C-1 7/11/07 ATTACHMENT C. SELECTED CRITERIA APPLICABLE TO AERODROME REPORTS (The guidance in this table relates to Chapter 4 and Appendix 3.) Cloud Surface wind Visibility (VIS) RVR1 A B C –10 –5 (Time, MIN) (OBS TIME) Present weather Amount Type2 Temperature Pressure (QNH, QFE) Supplementary information Directional variations3 Speed variations3 Directional variations4 Past tendency5 Variations5 Layers reported if coverage ≥ 60° and < 180° Special cases Minimum VIS ≠ prevailing VIS Mean speed − 5(AB) 5(BC) R R Specifications < 6 km/h (3 kt) ≥ 6 km/h (3 kt) ≥ 180° Exceeding the mean speed by ≥ 20 km/h (10 kt) General rule Minimum VIS < 1 500 m or < 0.5 × prevailing VIS VIS fluctuating and prevailing VIS cannot be determined < 100 m ≥ 100 m − R R > MAX [50 m or 20% × R ] Lowest layer Next layer > Next higher layer > CB6 or TCU Identification Parameters reported Updated if changes > agreed magnitude Parameter to be included 2 min 7 2 min 2 min 2 min 1 min 1 min Local routine and special report VRB + 2 extreme directions11 mean + 2 extreme directions11 VRB (no extremes)11 Minimum and maximum speed VIS along the runway(s) N/A N/A N/A8 Always 2/8 4/8 Always CB TCU QNH QFE9 Yes All10 10 min 10 min 10 min 10 min 10 min 10 min 1 min No tendency observed (“N”) Upward (“U”) or downward (“D”) METAR/ SPECI VRB (no extremes) mean + 2 extreme directions VRB (no extremes) Maximum speed11 Prevailing VIS Prevailing VIS and minimum VIS + direction Minimum VIS No tendency available, the tendency is to be omitted Minimum and maximum (instead of 10-minute mean) No general criteria applicable to all the WX phenomena (for specific criteria, see Appendix 3, 4.4.2) Always 2/8 4/8 Always CB TCU No criteria QNH No Recent WX of operational significance and wind shear12 Relevant reporting scales for all messages Direction in three figures rounded off to the nearest 10 degrees (degrees 1 – 4 down, degrees 5 – 9 up) Speed in 1 km/h or 1 kt Speed < 2 km/h (1 kt) indicated as CALM If Step applicable VIS < 800 m : 50 m 800 m ≤ VIS < 5 000 m : 100 m 5 000 m ≤ VIS < 10 km : 1 km VIS ≥ 10 km : None, given as 10 km or covered under CAVOK If Step applicable RVR < 400 m : 25 m 400 ≤ RVR ≤ 800 m : 50 m 800 < RVR < 2 000 m : 100 m13 N/A If Step applicable Base ≤ 3 000 m (10 000 ft) : 30 m (100 ft) (Reference level: Aerodrome elevation14 or mean sea level for off-shore structures) Rounded off to whole degrees: up for decimal 5 In whole hPa15 rounding down for decimals 1 – 9 N/A Notes.— 1. Considered for the past 10 minutes (exception: if the 10-minute period includes a marked discontinuity (i.e. RVR changes or passes 150, 350, 600 or 800 m, lasting ≥ 2 minutes), only data after the discontinuity to be used). A simple diagrammatic convention is used to illustrate those parts of the 10-minute period prior to the observation relevant to RVR criteria, i.e. AB, BC and AC. 2. Layer composed of CB and TCU with a common base should be reported as “CB”. 3. Considered for the past 10 minutes (exception: if the 10-minute period includes a marked discontinuity (i.e. the direction changes ≥ 30° with a speed ≥ 20 km/h or the speed changes ≥ 20 km/h lasting ≥ 2 minutes), only data after the discontinuity to be used). 4. If several directions, the most operationally significant direction used. 5. Let R1 = any 1-minute mean RVR-value during period AC, R10 = 10-minute mean RVR-value during period AC, R5(AB) = 5-minute mean RVR-value during period AB and R5(BC) = 5-minute mean RVR-value during period BC. 6. CB (cumulonimbus) and TCU (towering cumulus = cumulus congestus of great vertical extent) if not already indicated as one of the other layers. 7. Time averaging, if applicable, indicated in the upper left-hand corner. 8. N/A = not applicable. 9. QFE is to be included if required. Reference elevation for QFE should be aerodrome elevation except for precision approach runways, and nonprecision approach runways with threshold ≥ 2 m (7 ft) below or above aerodrome elevation, where the reference level should be the relevant threshold elevation.

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