...Modest Snowfall Accumulations Are Expected Over Much Of The
Northeastern U.S. This Weekend...
The Major Player During The Concluding Weekend Of 2012 Will Be A
System Impacting The Northeastern Corridor Of The Country.
An Upper Trough Swinging From The Lower Ohio Valley To The
Mid-Atlantic Will Allow An Expansive Shield Of Precipitation To
Develop Across Much Of The Eastern Third Of The Nation. Enough
Cold Air Has Worked Its Way Into The Region To Allow Snow To Be
The Dominant Precipitation Type From The Ohio Valley Up Through
The Upper Mid-Atlantic And Into New England.
It Appears The Dividing Line For Snow Will Occur Right Across The Washington D.C. Metro Area And Toward The Delmarva Peninsula. Given The Progressive Nature Of This Trough...Accumulations Should Generally Range From 2 To 6 Inches Over The Affected Region. The Snow Forecast Remains A Little More Uncertain Across Coastal Upper New England As The System Rapidly Strengthens In The Offshore Waters. Heavy Precipitation Will Fall Fairly Close To The Coastline And Any Further Shift Inland Would Significantly Alter The Forecast Snow Amounts.
Meanwhile...The Other Aspect Of This System Will Be Showers And Thunderstorms Which Develop Along The Surging Cold Front. Much Of This Activity Should Wind Down By Saturday Night As An Expansive Surface Ridge Builds To The West.
The Other Region Of Active Weather Will Be Across The Southwestern
States. A Strong Upper Trough Digging Southward Along The Coast Of California Will Continue To Fuel Light To Moderate Precipitation.
In Particular...The Shower Activity Will Particularly Focus Closer
To The Coastline Where The Better Moisture Support Should Occur.
However...This North To South Motion Of The System Is Not The Most
Favorable For Moisture Advection Into The West Coast Which Will
Limit The Overall Rain/Snow Totals. Eventually This Upper Trough
Will Split Into Two With Some Of The Energy Tracking Through The
Central Great Basin. This Is Expected To Spawn Some Light Shower
Activity But Its Effects Will Be Rather Limited.
The Other Batch Of Energy Is Forecast To Sink Further To The South Before Ejecting Eastward As Another System Quickly Approaches To Its North. While The Strongest Energetics With The Trough Will Be Across Mexico On Sunday...Moisture Return From The Western Gulf Of Mexico Will Allow Showers To Break Out Along The Big Bend Of Texas By The Evening Hours.
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