Garmin aera 510 Pilot's Guide - Page 98
AIRMETS, and sandstorms that lower visibility to less than three statute miles.
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Overview GPS Navigation Additional Features Hazard Avoidance Flight Planning Hazard Avoidance The METAR flag color is determined by the information in the METAR text. VFR (ceiling greater than 3000 feet AGL and visibility greater than 5 miles) Marginal VFR (ceiling 1000-3000 feet AGL and/or visibility 3-5 miles) IFR (ceiling 500 to below 1000 feet AGL and/or visibility 1 mile to less than 3 miles) Low IFR (ceiling below 500 feet AGL or visibility less than 1 mile) METAR text does not contain adequate information to determine flight conditions AIRMETs An AIRMET (AIRmen's METeorological Information) can be especially helpful for pilots of light aircraft that have limited flight capability or instrumentation. An AIRMET must affect or be forecast to affect an area of at least 3,000 square miles at any one time. AIRMETs are routinely issued for six-hour periods and are amended as necessary due to changing weather conditions. AIRMETs are displayed as colored, dashed lines. SIGMETs A SIGMET (SIGnificant METeorological Information) 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. Appendices Index 86 Garmin aera 500 Series Pilot's Guide 190-01117-02 Rev. A