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First Winter Storm to kickoff 2025-26 Winter season


Baroclinic Zone
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There's more going on than whether it's amped or flat. There's the location and amplitude of the shortwave, location of vorticity advection, the tilt of the trof, and its evolution over time.
 

Some runs over the past few days have been "amped" with a sharp shortwave and associated vortmax taking a northerly route near the Great Lakes into NYS (e.g., 0z 28th GFS) and others have been "ampled" but with the shortwave taking a more southerly track from AR through KY to VA (e.g., 06z 27th ECM). Other runs have been a little flat initially but amped up late (e.g., 0z 29th ECM) or initially amped only to quickly flatten (various CMC and UK runs). This combination of variables has led to a spectrum of outcomes that defy a simple binary description.

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