Weather Type Definitions


Predominant Weather (Wx)

The expected weather (precipitating or non-precipitating) valid at the indicated hour. The weather element includes type, probability, and intensity information.



Weather Key Graphic

Weather Legend

Weather Key Table


Probability Key

Probability category Potential Index
None 0-14
Slight chance, Isolated 15-24
Chance, Scattered 25-54
Likely, Numerous 55-74
Definite 75-100


Precipitation Intensity Key

Precipitation Intensity
Light (-)
Moderate (m)
Heavy (+)