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|CONVECTIVE SIGMETs are issued in the
conterminous U.S. for:
Any Convective SIGMET implies severe or greater
turbulence, severe icing, and low level wind shear. A Convective
SIGMET may be issued for any convective situation which the forecaster
feels is hazardous to all categories of aircraft. Bulletins are issued
hourly at Hour+55. The text of the bulletin consists of either an
observation and a forecast or just a forecast. The forecast is valid
for up to 2 hours.
- Severe surface weather including:
- surface winds greater than or equal to 50 knots
- hail at the surface greater than or equal to 3/4 inches in
- Embedded thunderstorms
- Line of thunderstorms
- Thunderstorms greater than or equal to VIP level 4 affecting
40% or more of an area at least 3000 square miles
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