Garmin GXM 30A - Manual (Page 30)

3 GXM 30A XM Radio Smart Antenna Owner’s Manual
SIGMET
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.
SIGMET detailed information
SIGMET selected with map pointer
XM W
eather
f
eatures
> sIgMet