Convective SIGMETs Flashcards
1
Q
what is the 3 letter abbreviation for Convective SIGMETs
A
WST
2
Q
what is a WST
A
an inflight advisory of convective weather significant to the safety of all aircraft
3
Q
when is a WST issued
A
hourly at 55 minutes past the hour
4
Q
where is a WST issued
A
western (W), eastern (E), central (C) USA
NOT ALASKA OR HAWA’II
5
Q
how long are WSTs valid for
A
4 hours
6
Q
what does a WST contain
A
either an observation AND a forecast
or
only a forecast
7
Q
when is a WST issued
A
- severe thunderstorms*
- tornadoes
- embedded thunderstorms of any intensity level
- a line of thunderstorms at least 60 miles long with thunderstorms affecting at least 40% of its length
- thunderstorms producing heavy or greater precipitation (VIP level 4) ffw ting at least 40% of an area of at least 3000 square miles
8
Q
*severe thunderstorms under WST due to what
A
- surface winds greater or equal to 50 kts
- hail at the surface greater than 3/4” in diameter
9
Q
any WST implies
A
severe or greater turbulence, severe icing, & low-level wind shear
