Colour Codes

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Military airfield’s within the UK use a colour at the end of the airfield METAR. This is to allow pilots to be able to assess the weather conditions at an airfield quickly without a requirement to read full METAR. The colour is assigned given two pieces of information, the cloud base and the visibility. In the case that the visibility and the cloud base are in different colures the lower one is used.

The Colour Codes

Colour Code Minimum base of lowest cloud (SCT or more) above aerodrome level Minimum reported visibility
Blue 2500ft 8km
White 1500ft 5km
Green 700ft 3700m
Yellow 300ft 1600m
Amber 200ft 800m
Red <200ft <800m
Black Aerodrome unavailable for reasons other than cloud or visibility