METAR (Meteorological Aerodrome Report) is the international standard format for reporting current weather conditions at airports. It typically includes wind, visibility, clouds, temperature, dew point, and pressure.
Example: '27010KT' means wind from 270 degrees at 10 knots. '10SM' means 10 statute miles visibility. 'OVC020' means overcast sky at 2,000 feet AGL.
VFR conditions require a minimum ceiling of 1,000 feet and visibility of 3 statute miles (in controlled airspace). Lower conditions may require IFR.
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