Decoding Guide
Average Relative Humidity Chart
Description:
This chart depicts the average relative humidity between the surface and 500mb (18,000ft). An average relative humidity of 50% or greater is quite frequently associated with areas of clouds and possibly precipitation.
Issuance:
0000 and 1200 UTC
Data Sources:
Surface and upper air observations, computer models
Depiction:
Individual observations are depicted in white. At each station, the relative
humidity value is plotted above a symbol. See the table below for an interpretation
of the symbols.
 |
Relative Humidity less than 50% |
 |
Relative Humidity greater than or equal to 50% |
 |
All significant observations missing |
 |
Some mandatory observations missing |
 |
Some mandatory and significant observations missing |