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SIGWX : ウィキペディア英語版
SIGWX

SIGWX is a Significant Weather Chart defined by ICAO.
Weather charts 〔(Representing WAFS SIGWX Data in BUFR v4.3 )〕 being issued by World Area Forecast Centres 〔(ICAO World Area Forecast System Operations Group webpage )〕 (from meteorological offices in London and Washington), presenting the most important meteorological phenomena relevant especially for air traffic transport. WAFC publishes them in two formats
* BUFR code
* PNG images
Charts are typically being issued every six hours (0, 6, 12, 18 UTC) and contain forecast valid for next 12 hours. Prognoses are typically prepared for two ranges of heights:
* SWH - High Level SIGWX (Flight level 250-630)
* SWM - Medium Level SIGWX (Flight level 100-450)
Weather phenomena:
* Cloud - including information about cloud type, height of base and top, turbulence and icing risk
* Clear Air Turbulence - including base and top height, strength of turbulence
* Jet Stream - including base and top height, wind speed
* Tropopause Height
* Tropical Cyclone, Sandstorm
* Volcanoes
* Frontal system
IMPORTANT NOTE: Amendment 74 to ICAO Annex 3 (effective 7 November 2007) 〔(Amendment 74 to ICAO Annex 3 )〕 eliminated the requirement for depiction of surface fronts and well-defined convergence zones (e.g. ITCZ) on WAFS SIGWX forecasts (in BUFR-code and PNG chart form). WAFC still publishes frontal bulletins, but they contain no data.
== References ==

fr:Prévision de zone pour l'aviation

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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