SIGMETs are warnings issued by the competent meteorological watch office within a flight information region (FIR) to alert aircraft of significant weather hazards. These warnings are not issued for hazards specific to aerodromes. A SIGMET is typically issued when hazardous conditions are either forecasted or reported by aircraft.
SIGMETs cover the following hazards:
- Thunderstorms
- Heavy hail
- Tropical cyclones
- Freezing rain
- Severe turbulence (not associated with convective clouds)
- Severe icing (not associated with convective clouds)
- Severe mountain waves
- Heavy sand or dust storms
- Volcanic ash clouds
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