Garmin 010-00730-00 User Manual

XM WX Weather Features

A SIGMET (Significant METeorological Forecast) advises 

of weather that is potentially hazardous to all aircraft. In the 

contiguous United States, the following items are covered: 

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 the following 

conditions: thunderstorms, isolated severe thunderstorms, 

embedded thunderstorms, hail at the surface, and tornadoes.
A SIGMET is widespread and 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.