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NAM 100mb Geopotential Height Map Unavailable
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About This Map

Geopotential height is the altitude at which the air is at a given pressure at a given moment. When meteorologists mention "upper-level low pressure systems", they are referring to low geopotential heights, usually at the 500mb level. Low geopotential heights are often associated with storm systems and cold air. Geopotential height anomaly is the departure of the geopotential height from average at a given level. On our weather maps, geopotential height and geopotential height anomaly are given in decameters.

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Map Status


Model Run Hour
GFS 12Z 066
GFS-HR 12Z 066
NAM 12Z 084
RAP 15Z 005
ECMWF 12Z 240
GEFS 12Z 006
CMC 00Z 240

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