Aviation Weather Services Handbook by Federal Aviation Administration

Author:Federal Aviation Administration
Language: eng
Format: epub
Publisher: Skyhorse
Published: 2011-10-28T00:00:00+00:00

6.1.5 SIGMET – Outside the Conterminous U.S. (O-CONUS)

6.1.5.1 SIGMET Issuance Criteria – Outside the Conterminous U.S. (O-CONUS)

SIGMETs outside the Conterminous U.S. (O-CONUS SIGMETs) are issued when any of the following is occurring or expected to occur affecting an area greater than 3,000 square miles or, in the judgment of the forecaster, an area having the potential to have a significant effect on the safety of aircraft operations.

Thunderstorm - of type below* Obscured (OBSC TS)

Embedded (EMBD TS)

Widespread (WDSPR TS)

Squall line (SQL TS)

Isolated severe (ISOL SEV TS)

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