Convective Sigmet (WST)
A Convective Sigmet may be issued for any of the following;
- Severe thunderstorms due to:
- surface winds 50 knots or greater.
- hail at the surface greater than or equal to 3/4 inches in diameter.
- Embedded thunderstorms.
- A line of thunderstorms.
- Thunderstorms greater than or equal to VIP level 4 affecting 40% or more of an area of at least 3,000 square miles.