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Destructive Late April Snow for the Appalachians

April 22, 2012

Remember the October 2011 heavy, wet snowstorm that caused millions in the Northeast to go without power for weeks?  This time, locations from Jamestown New York to Bradford PA to Elkins, West Virginia could be digging out from 6 to 14″ of heavy, wet snow by Tuesday morning.  I fear that elevations at or above 1500 feet will be most susceptible for a damaging, heavy, wet snow that will bring down trees and power lines. 

One to two inches of steady, soaking rain will fall by late tonight across the Washington Metropolitan Area.

As the upper level low swings overhead on Monday morning, temperatures aloft will cool rapidly causing the rain showers to mix with snow, even across the far western suburbs of Washington and BaltimoreThe North American Model shifted the rain-snow much further east into the Shenandoah Valley on Monday morning.

NAM (North American Model) shows snow falling across the Shenandoah Valley on Monday Morning. Snow may even mix in at times with the rain across the northern and western suburbs of DC and Baltimore.  Image courtesy: weatherunderground.com

Winter Weather Advisories may be needed for the higher elevations of:  The Shenandoah Valley, Skyline Drive, Loudoun County VA and Frederick County Maryland (elevations above 1500 feet) where 2 to 4″ of snow could accumulate on trees causing scattered power outages.  

Highs on Monday will range from the mid 30s out west to the lower to mid 40s in DC and Baltimore. Winds will gust out of the northwest at 30 mph lowering wind chills into the 20s!

Snow Accumulation Timeline:

Snowfall Accumulation Potential between 6 & 9 AM Monday. Courtesy: weatherunderground.com

Snowfall Accumulation Potential between 9AM & 12PM Monday. Courtesy: weatherunderground.com

Snowfall Accumulation Potential between 12PM & 3PM Monday. Courtesy: weatherunderground.com

Snowfall Accumulation Potential between 3PM & 6PM Monday. Courtesy: weatherunderground.com

High temperatures in the Nation’s Capital will gradually moderate into the middle 60s by mid to late week.

2 Comments leave one →
  1. Joel permalink
    April 22, 2012 8:26 AM

    Hey Tim! So one to two inches of steady, soaking rain will help the water table. Where will we be in terms of drought after this is all said and done? Thanks!

    • Tim permalink*
      April 22, 2012 11:17 AM

      The immediate Washington Area needs about 3 to 4″ of rain to get out of the drought. The intensity of the rain will really pick up as the upper level low catches up to the surface low still sitting off the coast of GA at this time. The heaviest rain will fall between 6 PM and midnight. The Eastern shore of Maryland is worse off with a rainfall deficit running closer to 6″. They are under the gun for rainfall totals approaching 3.5 to 4.5″. The rainfall today will cut the drought in half for the entire Washington Region, the rest of the Mid-Atlantic states (Delaware, New Jersey, New York/Long Island) and parched, southern New England.

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