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NAM 500mb Vertical Velocity Map Unavailable
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About This Map

Vertical velocity, also called omega, is the speed of air motion in the vertical direction. Negative values represent rising air, and positive values represent falling air. On our weather maps, vertical velocity is given in decipascals per second.

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Map Status


Model Run Hour
GFS 12Z 222
GFS-HR 12Z 225
NAM 12Z 084
RAP 15Z 021
ECMWF 00Z 240
GEFS 06Z 384
CMC 12Z 006
ECMEPS 00Z 240

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2018-12-04: Changed snowfall algorithm to be more accurate.