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## Key to Aerodrome Forecast (TAF) and Aviation Routine Weather Report (METAR) (Back) 

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## Table of Significant Present, Forecast and Recent Weather - Grouped in categories and used in the order listed below; or as needed in TAF, No Significant Weather. 

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- Explanations in parentheses “()” indicate different worldwide practices. 

- Ceiling is not specified; defined as the lowest broken or overcast layer, or the vertical visibility. 

- NWS TAFs exclude BECMG groups and temperature forecasts, NWS TAFS do not use PROB in the first 9 hours of a TAF; NWS METARs exclude trend forecasts. US Military TAFs include Turbulence and Icing groups. 

