GFS 700 mb frontogenesis and 700-500 mb negative EPV valid 10/25 18z.

GFS forcing

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Speaker Notes:

Looking at GFS forecasts: The GFS at 18z on the 25th was also indicating mid-level frontogenesis over upstate NY at 18z on the 25th. There was slightly less co-location between the frontogenesis and the negative EPV compared to the NAM forecast shown previously.

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