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Light snow possible Thursday night. Frigid temperatures over the weekend (05 JAN 2017)

  POSTED ON: Thursday, January 5, 2017 8:03 AM by Meteorologist A.R. Davies

A quick moving Clipper will result in snowfall overnight on Thursday with unseasonably cold temperatures in its wake over the weekend. 

A upper air disturbance (i.e. "Clipper") is over across the Midwest on Thursday morning and will move toward the Mid-Atlantic throughout the day on Thursday. Accumulating snow showers could begin as early as 1900 EST, with the best chance for accumulation between 2200 EST on Thursday and 0400 EST on Friday.  Initially, the most potent upper air dynamics will be across Southern Pennsylvania and Northern Maryland before the energy from the upper air disturbance is transferred to a developing coastal storm along the Delmarva Peninsula.  At this time, it looks like 1.0 to 2.0 inches of snow is possible north of Baltimore, MD.  South of Baltimore, MD up to 1.0 inch is a good bet around Annapolis, MD.  The intensifying coastal low could help boost snow totals slightly pre-dawn on Friday, but at the time, the best chance for that looks south and east of Annapolis, MD (although this is not out of the realm of possibilities).

The first figure below shows the snowfall project through 0700 EST on Friday from the National Weather Service (NWS) NAM/WRF 4-km high resolution model. The second figure is the official NWS snowfall forecast through 1000 EST on Friday. 

NAM model snowfall through 0700 on 20170105

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NWS forecast through 1000 on 20170105

Behind the Clipper, expect temperatures to remain below freezing over the weekend in Annapolis, MD.  Daytime high temperature on Saturday and Sunday will top out around 30 degrees with overnight low temperatures around 20 degrees.  A developing coastal storm will pass south of Annapolis, MD on Saturday.  At this time, it looks like most of the snow will remain to our south. 

ISSUED: 05 January 20176 at 0815
FORECASTER: Meteorologist A.R. Davies
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Category: General Interest

Alexander R. Davies

Meteorologist & Oceanographer
Oceanography Department, USNA