US Preliminary Extended Weather Update thru Dec 15

Used The 00z/08 Ecmwf To Update The Preliminary Fronts And
Pressures For Days 3 Through 7.

The Latest Global Numerical Models Are In Good Agreement, With The Ecmwf Showing More Run-To-Run Continuity Than The Gfs, Gem Global, And Ukmet.

The Pattern Will Change This Period, With A Trough Digging Down The Pacific Coast, And A Southeast Ridge Popping Up.

The Split In The Flow Over The West Will Send A Branch Of Flow Across The Great Plains And Into The Great Lakes And Saint Lawrence Valley, With Wintry Precipitation Indicated North Of The Polar Front.

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