Garmin 30a Manuale Proprietario

A SIGMET (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. 
A Convective 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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