US Preliminary Extended Weather thru Dec 28

The New High Latitude Blocking Will Relax Enough At The Medium
Range To Allow At Least Two Shortwaves The Development Space To
Threaten Portions Of The Central And Eastern United States With
Snow And Ice.

The First Impulse Is Expected To Lift Up The Ohio River Valley Day 4, Painting A Narrow Stripe Of Snow, Sleet, Or Freezing Rain To Its North.

The Second, More Significant Wave, Will Also Try To Lift Toward The Ohio River Valley Day 5, But May Be Held To The Latitude Of Tennessee In The Wake Of The Lead Impulse.

Damming Looks Like A Good Bet East Of The Appalachians From Virginia To Pennsylvania Day 5, So That Warming Aloft May Lead To Overrunning Freezing Rain And Sleet South Of The Old Mason-Dixon Line, And Sleet And Snow To The North.

Thereafter, The Action Should Shift Back To The West, Where New Energy Is Expected To Roll Into The Nation Upstream Of The Reestablishment Of The Eastern Block. Relied On The 12z/20 Ecens Mean For This Package, Which Represents A Stable Middle Ground Between Some Of The More Developed Deterministic Solutions And Some Of The Flatter Ones East Of The Mississippi River.

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