SIGMET advisories are issued for hazardous weather conditions that may affect the safety of aircraft in flight, such as severe thunderstorms, volcanic ash, or turbulence. They are issued as warnings to alert pilots of these potentially dangerous conditions along their planned flight path. Pilots are expected to take appropriate action to avoid the affected areas based on the information provided in the SIGMET advisory.
12 hours
Tornadoes, embedded thunderstorms, and hail 3/4 inch or greater in diameter.
The pilot should file a IFR flight plan and be ready for a rough ride.