Heights of cloud bases, tops, freezing level, icing, and turbulence are referenced to mean sea level (MSL) unless otherwise stated. Ceilings are given in heights above ground level (AGL). The causes of LIFR, IFR, or MVFR are indicated by either ceiling or restrictions to visibility, or both. If winds (or gusts) of 25 knots or greater are forecast for the outlook period, the word WIND is included. Example: IFR CIG RA WND: Expect IFR conditions due both to ceiling below 1,000 feet and to visibility restricted by rain; the wind is expected to be 25 knots or greater.

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