Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
Valid 12Z Sat Dec 07 2013 - 12Z Mon Dec 09 2013
...Snow from the Middle Missouri Valley to the Upper Great Lakes and over parts of the Mid-Atlantic...
...Heavy rain possible from the Lower Mississippi Valley to the Tennessee Valley...
...Temperatures will be 10 to 35 degrees below average from the High
Plains to Great Lakes/Central Gulf...
A storm over the Great Basin will move eastward to the Middle Mississippi Valley and merge with the system over the Southeast by Sunday evening. The system will produce snow over the Great Basin/Central Rockies and the higher elevations of California that will move eastward into the Central Rockies/Middle Missouri Valley by Sunday morning. The snow will wane to a few small areas over parts of the Central Rockies by Sunday evening. Rain will also develop over parts of Central/Southern California through Saturday evening.
In the meantime, a front over the Southeast will begin to lift northward
over the Central/Eastern Gulf Coast by Sunday evening and merge with the storm from the West. The system will produce showers and thunderstorms over parts of the Southeast/Southern Mid-Atlantic on Saturday.
Rain will develop over parts of the Central Gulf Coast on Saturday and will lift northward into the Tennessee Valley/Southern Mid-Atlantic by Sunday.
Snow will develop over parts of the Ohio Valley on Sunday morning that will expand into the Upper Great Lakes to the Northern Mid-Atlantic by Sunday evening. A band of freezing rain/sleet will develop over parts of the Tennessee Valley and the Mid-Atlantic on Sunday.
Elsewhere, lake effect snow will develop over parts of the Upper Great
Lakes through Sunday morning.
High pressure will develop over the Pacific Northwest on Sunday. Another area of high pressure over the Northern Plains will move eastward to Northeast/Southeastern Canada by Sunday evening.
Extended Forecast Discussion
Nws Weather Prediction Center College Park Md
Valid 12z Tue Dec 10 2013 - 12z Sat Dec 14 2013
...More Early-Season Arctic Air Slated For The Central United
Continue To Rely On The Steadiness Of The Ecmwf/Ecens Mean For The Synoptic Details Across The Nation At The Medium Range.
Precipitation Will Take Second Fiddle To The Anomalous Cold, With
The Only Appreciable Increase In Moisture Anticipated Along The
Pacific Coast And In The South Central States Day 7.
Most Of The Snowfall Should Be Confined To The Cascades And Downwind Of The Great Lakes.
The Sharpest Cold Should Center On The Ozarks Early In The Period,
With Minimum Temperatures Some 30 Degrees Below Normal.
The Next Delivery Of Arctic Air Is Expected To Be Most Anomalous Over
Northern Minnesota Later In The Period, With Cities Like Duluth
Falling Appreciably Short Of Zero Even During The Early Afternoon.