NAM 24-hour 500 mb heights and vorticity valid 03/01 00 UTC.

500 mb

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NAM 24-hour 500 mb forecasts valid at 00 UTC on the 1st showed a deep trough over the western Great Lakes. A short-wave trough was forecast to be lifting northeast along the mid-Atlantic coast in the southwesterly flow ahead of the main upper-level trough.

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