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About This Map

Thickness is the difference between the geopotential heights at two levels of the atmosphere at a given moment. The black line on each map denotes roughly where the freezing line is for that section of the atmosphere. Thickness anomaly is the departure of the thickness from average. On our weather maps, thickness and thickness anomaly are given in decameters.

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Map Status


Model Run Hour
GFS 18Z 336
GFS-HR 18Z 336
NAM 18Z 084
RAP 22Z 021
ECMWF 00Z 240
GEFS 18Z 186
CMC 12Z 240

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