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3/10 Early AM All Zones Update: Light to Moderate Snowfall Today

A wave of low pressure moving east from the Delmarva region, will bring a light to moderate snowfall to much of the region. Over the higher elevations over Northwest NJ and parts of Lower Hudson Valley snow has been falling over past few hours and surface temperatures have dropped to near freezing. So some accumulation is likely occurring on colder surfaces.

Closer to the coast, boundary layer temperatures may initially support some rain or wintry mix at the start, But it should quickly change over to snow, as lower dewpoints and wet-bulb temperatures, will support more cooling down to surface. Surface temperatures should fall down into low to mid 30s everywhere over by 9am.

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The importance of a cross polar flow and Aleutian ridge in December

Multiple ensemble guidance indicate a major pattern change over the Pacific region. A ridge will builds near Aleutians then poleward into the Bering Strait and the Artic Ocean next week. This will cause cross-polar flow to finally setup over the North America.  All the anomalous cold air that is has been over much of Eurasia for the last several weeks with finally see an open gateway into North America. Temperatures departures are forecast to between 10 to 20 below average over parts of the Rockies and Northern and Central Plains over next weeks.

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