US Final Extended Weather thru Jan 22

An Amplified Ridge/Trough Pattern Is Expected Through The Medium
Range Period With A Cold Trough Anchored In Hudson Bay And Eastern Canada And A Ridge Along The Continental Divide And Westward To The West Coast. The Canadian/Gefs/Ecmwf Ensembles Have The General Flow Pattern In Order...With The Eastern Pacific Flow Aloft And A Slow To Breakdown The Ridge In The West.

The 15/00z Operational Ecmwf/Ukmet Were Decent Operational
Guidance Package To Follow Through Day 5 With The Operational Gfs Displaying Its 'Faster' Bias...In The Eastern Pacific And With Its
Breakdown Of The Upper Ridge In The West.

The Strong Ridge In The Southeast And All The Warm Air/Moist Air
Along Its Western Periphery Will Be All But A Memory By Day
3...With A Succession Of Canadian/Arctic Airmass Intrusions
Shunting The Southeast Ridge Out To Sea.

Lining Up Along The Upwind Side (In Northwest Flow Aloft) Of The Deep Troughing Over Eastern Canada....These Canadian/Arctic Intrusions Will Trend Temperatures Downward...And Well Below Normal (Bitter Cold) For Much Of The Northern Plains And Parts Of The Upper Great Lakes.

The Only Exceptions Will Be In The Southwest...Where The Ridge
Will Rebuild...And Allow For More Seasonal Temperatures Across
Southern Nevada...Arizona And Parts Of New Mexico...Texas And
California. In General...Areas South And West Of The Stationary
Front Depicted On The Day 5, 6 And 7 Surface Progs Will Be Milder.

What Light Precipitation Will Occur In This Pattern Will Be Confined To The Leading Edges Of The Shallow Cold Fronts. This Favors The Northern High Plains In A Weak Upslope Flow...The Great Lakes And Lake-Enhancement Snows...And The Windward Slopes Of The
Appalachian Chain And Immediately Downwind Along The Appalachian Trail.

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