What are SIGMET, AIRMET and VOLMET definition, limitations & types?

050 Meteorology theory.
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What are SIGMET, AIRMET and VOLMET definition, limitations & types?

Postby CaptainMFT » 17 Jun 2016 04:17

What is SIGMET and under which scenario is it published?
Information issued by a meteorological watch office regarding the occurrence or expected occurrence of specific enroute weather phenomena which can have an effect on the safety of airplane operations. 
SIGMET warnings are routinely issued by each FIR and relate to cruising levels usually higher than FL100 in conjunction with AIRMETs. SIGMET are going to be issued for severe mountain waves. SIGMET data is issued as a warning for significant weather to "all aircraft" and not only for lightweight or heavy ones. In a short interval, if several flight crews report that they experienced strong clear air turbulence in a very certain airspace then as a consequence of those reports the competent aviation weather office can issue a SIGMET. Heavy dust storm phenomena are mentioned inside a SIGMET.


What is AIRMET and when is it published?
Information issued by a meteorological watch office regarding the occurrence or expected occurrence of specified enroute weather phenomena which can have an effect on the safety of low-level airplane operations and that wasn't already enclosed within the forecast issued for low-level flights within the flight information region involved or sub-area thereof. 
AIRMET warnings are specifically for traffic within the lower levels, usually up to FL100 however up to FL150 or higher in mountainous regions.


What is VOLMET and when is it published?
Routine broadcast containing, as appropriate, current airfield weather reports, airfield forecasts and SIGMET messages for airplane in flight.
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CaptainMFT.

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