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CFI lesson plans to teach aviation lessons as a Certified Flight Instructor

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Heavy intensity (METAR)

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A leading plus sign means heavy intensity. Example: +SN is heavy snow. Note the special case +FC, which does not mean “heavy funnel cloud” but tornado or waterspout.

Source FAA, Key to Aerodrome Forecast (TAF) and Aviation Routine Weather Report (METAR)↗ · checked 2026-08-25

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