SIGMET/AIRMETs Help Page 2 of 2

The SIGMET/AIRMETs in the graphical image have the following representation. An icon (see the table below) is placed approximately in the center of the SIGMET/AIRMET polygon. Icon Description Tropical cyclone TC forecast TC outlook Thunderstorms Hail Squall line Moderate turbulence Severe turbulence Moderate icing Severe icing Volcanic ash VA forecast VA outlook Limited visibility Mountain obscuration Cloud Mountain wave Sand/Dust storm Unknown weather type The SIGMET/AIRMET issuing FIR and ID are placed under the icon. In this example, "RKRR" is the FIR and "01" is the ID. A polygon is drawn around the SIGMET/AIRMET area: Note that if the SIGMET/AIRMET boundaries cannot be decoded from the SIGMET/AIRMET text but the FIR for the SIGMET/AIRMET can be decoded, the polygon is drawn around the entire FIR even if the SIGMET/AIRMET only includes a portion of the FIR. The polygon around the FIR will have dashed, rather than solid, edges. See the text for the SIGMET/AIRMET to determine its actual location.

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