US Extended Forecast thru Dec 13

Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
Valid 12Z Fri Dec 06 2013 - 12Z Sun Dec 08 2013

...Snow expected from the Middle Mississippi Valley to parts of New
England...

...A band of sleet/freezing rain is expected from parts of the Lower
Mississippi Valley to parts of Northern Mid-Atlantic...

...Temperatures will be 10 to 30 degrees below average from the Plains to parts of the Mississippi Valley...

A front extending from the Northeast Coast to the Western Gulf Coast will move southeastward to the Southeast Coast by Saturday evening.

Moisture from the Gulf of Mexico will pool along the boundary producing bands of snow, sleet, and rain over parts of the Southern Plains to the Western portions of the Ohio Valley through Friday afternoon.

Showers and thunderstorms will develop along the front from the Western Gulf Coast to parts of the Southern Mid-Atlantic through Saturday morning.

In addition, rain will develop over parts of the Tennessee and Ohio Valleys into the Northern Mid-Atlantic/New England, moving mostly off the Northeast Coast by Saturday.

Snow will develop over parts of the Ohio Valley into the Lower Great Lakes moving into parts of Northern New England by late Friday night, before ending on Saturday morning.

As the front settles over the Southeast, rain will develop over the
Western/Central Gulf Coast into the Southeast and Southern Mid-Atlantic by Saturday evening.

A new band of sleet/freezing rain will develop over parts of eastern Texas also on Saturday evening.

Behind the front, high pressure over the West-Central Canada will move southeastward to the Upper Mississippi Valley bringing cold air to the Upper Midwest to the Southern Plains.

The cold air and upper-level energy will produce lake effect snow over the Upper Great Lakes through Saturday.

Meanwhile, energy over the Pacific Northwest will dig southeastward over the Great Basin/Central Rockies by Saturday. The system will produce snow down to the coast over part of the Northwest and rain along parts of the Northern California Coast with snow developing over the higher elevations of Northern California on Friday.

Rain will move southward over parts of Central/Southern California with snow over the higher elevations on Saturday. Additionally, snow will move into parts of the Great Basin/Southwest and the Northern/ Central Rockies on Saturday, too.

Snow will also develop over parts of the Central Plains by Saturday evening.

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Extended Forecast Discussion
Nws Weather Prediction Center College Park Md
1259 Am Est Fri Dec 06 2013
Valid 12z Mon Dec 09 2013 - 12z Fri Dec 13 2013

A Solid Run Of Four Consecutive Ecmwf/Ecens Mean Solutions For The Medium Range Bodes Well For Confidence In The Current Forecast.

Another Impressive Cold Outbreak Is Slated For This Period, Beginning In The Northern Intermountain Region And Spreading To
The Atlantic Coast.

The Split Flow Along The West Coast Should Direct An Onshore Component Sufficient To Bring Significant Precipitation To The Pacific States.

A Wave Of Low Pressure Is Expected To Pass Across The Deep South Late In The Forecast, Tracking To The Carolina Coast.

This System May Have Enough Cold Air Available For Snowfall To The North Of Its Path. Otherwise, The Big News Will Be Another Round Of Much-Below-Normal Temperatures For The North Central States.


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