Publication: Magyar Közlöny
Issue: MK-2009-104 (Year: 2009, Number: 104)
Era: 2004-2010
Section: 
Paragraph Index: 525

1. CRITERIA RELATED TO TAF 1.1 TAF format 1.1.1 TAF shall be issued in accordance with the template shown in Table A5-1 and disseminated in the TAF code form prescribed by the World Meteorological Organization. Note.— The TAF code form is contained in WMO Publication No. 306, Manual on Codes, Volume I.1, Part A — Alphanumeric Codes. 1.1.2 Recommendation.— TAF should be disseminated, under bilateral agreements between States in a position to do so, in the WMO BUFR code form, in addition to the dissemination of the TAF in accordance with 1.1.1. Note.— The BUFR code form is contained in WMO Publication No. 306, Manual on Codes, Volume I.2, Part B — Binary Codes. 1.2 Inclusion of meteorological elements in TAF Note.— Guidance on operationally desirable accuracy of forecasts is given in Attachment B. 1.2.1 Surface wind Recommendation.— In forecasting surface wind, the expected prevailing direction should be given. When it is not possible to forecast a prevailing surface wind direction due to its expected variability, for example, during light wind conditions (less than 6 km/h (3 kt)) or thunderstorms, the forecast wind direction should be indicated as variable using “VRB”. When the wind is forecast to be less than 2 km/h (1 kt), the forecast wind speed should be indicated as calm. When the forecast maximum speed (gust) exceeds the forecast mean wind speed by 20 km/h (10 kt) or more, the forecast maximum wind speed should be indicated. When a wind speed of 200 km/h (100 kt) or more is forecast, it should be indicated to be more than 199 km/h (99 kt). 1.2.2 Visibility Recommendation.— When the visibility is forecast to be less than 800 m, it should be expressed in steps of 50 m; when it is forecast to be 800 m or more but less than 5 km, in steps of 100 m; 5 km or more but less than 10 km, in kilometre steps; and when it is forecast to be 10 km or more, it should be expressed as 10 km, except when conditions of CAVOK are forecast to apply. The prevailing visibility should be forecast. When visibility is forecast to vary in different directions and the prevailing visibility cannot be forecast, the lowest forecast visibility should be given. Annex 3 — Meteorological Service for International Air Navigation Appendix 5 7/11/07 APP 5-2 5/11/08 No. 74 1.2.3 Weather phenomena Recommendation.— One or more, up to a maximum of three, of the following weather phenomena or combinations thereof, together with their characteristics and, where appropriate, intensity, should be forecast if they are expected to occur at the aerodrome: — freezing precipitation — freezing fog — moderate or heavy precipitation (including showers thereof) — low drifting dust, sand or snow — blowing dust, sand or snow — duststorm — sandstorm — thunderstorm (with or without precipitation) — squall — funnel cloud (tornado or waterspout) — other weather phenomena given in Appendix 3, 4.4.2.3, only if they are expected to cause a significant change in visibility. The expected end of occurrence of those phenomena should be indicated by the abbreviation “NSW”. 1.2.4 Cloud Recommendation.— Cloud amount should be forecast using the abbreviations “FEW”, “SCT”, “BKN” or “OVC” as necessary. When it is expected that the sky will remain or become obscured and clouds cannot be forecast and information on vertical visibility is available at the aerodrome, the vertical visibility should be forecast in the form “VV” followed by the forecast value of the vertical visibility. When several layers or masses of cloud are forecast, their amount and height of base should be included in the following order:

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