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US Extended Forecast thru Dec 26

...Strong Storm To Bring Heavy Rain, Thunderstorms, Snow, And Wind
To The Midwest...
...Frigid Cold In The Northern Plains...Record Warmth In The Mid
Atlantic Region...

Relied On The Most Recent Ensemble Means As A Synoptic Guide For The Fronts And Pressures This Package.

The Deterministic Solutions Have Proven Far Too Volatile Over The Past Few Days To Invest In Their Details At The Medium Range.

With A T-Bone-Occluded System Lifting Into The Great Lakes Day 3, Expect Heavy Rain Close To The Low Track,

Thunderstorms--Some Severe As Per The Latest Spc Outlook--Along The Attendant Cold Front Trailing Into The Western Gulf States, And Snow And Ice Northwest Of The Primary Low Track From Eastern Kansas Into The Upper Midwest.

Snow And Ice Are Also Expected Well Ahead Of The Main Surface Low With The Warm Advection Across Extreme Upstate New York And Northern New England. With Gradients Tightening Throughout The Midwest And Northeast, Winds Should Increase Sharply Day 3 Into Day 4.

The Big Storm Will Feed Upon Extreme Baroclinicity As Much As
Anything, With Record Warmth Ahead Of It In The Central
Appalachians And Mid Atlantic Region, And Frigid Cold Being Drawn
Southward Into The Northern Plains Behind The Low.

After The Storm Passes, The Pattern Goes Benign Quickly From Coast To Coast, With Continental Polar Air Dominating Much Of The
Nation.

Some Return Flow And Light Precipitation Are Expected Over The Western Gulf States Late In The Period As A Shortwave Crosses The Region.

Also, A Clipper System Grazing The Upper Midwest And Great Lakes Days 6 And 7 Should Bring Snow Showers To Those Regions.

The Southwest Looks High And Dry, With The Pronounced Split In The Westerlies Over The Eastern Pacific Directing Energy And Moisture Around The Region.

The Northwest Will Dry Out After The Northern Stream Is Diverted Away From That Area Mid Period.


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