SIGMET: Significant Meteorological Information is a weather advisory from a meteorological agency that contains information specific to aircraft safety.
Severe Weather (WS) and Volcanic Ash (WV) SIGMETS are valid for 4 hours. Tropical Cyclones (WC) SIGMETS are valid for 6 hours.
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METARs is a weather report, produced every hour, that gives present weather conditions of the area (10 km or more) around the aerodrome.
It is predominantly used by pilots as part of the pre-flight briefing, and by forecasters for forecasting.
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