XM WEATHER FEATURES > SIGMET
SIGMET
ASIGMET (SIGnificant METeorlogical Forecast) advises of weather that is potentially hazardous to all aircraft. In the contiguous United States, items covered are: severe icing, severe or extreme turbulence, volcanic ash, dust storms, and sandstorms that lower visibility to less than three statute miles.
AConvective SIGMET is issued for: thunderstorms, isolated severe thunderstorms, embedded thunderstorms, hail at the surface, and tornadoes. A SIGMET is widespread. A SIGMET must affect or be forecast to affect an area of at least 3,000 square miles.
SIGMETs are displayed as a yellow dashed line. To view SIGMET data, select the SIGMET using the map pointer. To view detailed information, press ENTER.
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