Weather US Short Range Outlook thru Sep 26

Short Range Forecast Discussion
Nws Hydrometeorological Prediction Center Camp Springs Md
424 Am Edt Fri Sep 24 2010

Valid 12z Fri Sep 24 2010 - 12z Sun Sep 26 2010

A Highly Amplified Upper Pattern Will Be Featured As The Work Week
Concludes And The Weekend Nears. A Mid-Level Disturbance Working
Its Way Through The Upper Midwest Will Begin Making More Of A Jog
To The North As It Approaches Eastern Canada. At The
Surface...This Will Drive A Frontal Boundary Eastward Allowing For
Quite A Change In The Sensible Weather. In Fact...High
Temperatures Which Have Been In The Low/Mid 90s From The
Mid-Atlantic Southward Can Expect Numbers Closer To The Low/Mid
70s By The End Of The Weekend. Besides The Noticeable Change In
The Temperature And Humidity...Precipitation Will Also Follow This
System With The Coverage Gradually Diminishing In Intensity And
Coverage. This Is The Result Of The Upper Forcing Moving Farther
Into Canada Which Is Where The Best Dynamical Lift Will Reside.
Consequently...The Heaviest Rains During This Period Are Expected
North Of The Warm Front And In Association With The Surface Low
Center Which Will Both Reach Canada By Late Friday.

While One System Marches Eastward Toward Canada...Another
Disturbance Aloft Will Dive Southeastward Ahead Of A Building
Ridge Over The Western U.S. By Sunday...This Upper System Will
Become More Cut-Off In Nature And Position Itself Very Near The
Ozarks. Ultimately...Unsettled Conditions Will Be The Rule In
Response To This Piece Of Energy As Numerous Showers And
Thunderstorms Are Expected. It Is However Still Too Early To Tell
If This System Will Become More Progressive In Nature Or Become
More Quasi-Stationary As The Weekend Concludes.

A Very Wet Pattern Has Set Up Over Western British Columbia As A
Series Of Strong Upper Systems Impact The Region. In Response To
Some Powerful Surface Low Centers...A Strengthening Onshore Flow
In Excess Of 40 Knots Will Direct A Large Plume Of Pacific
Moisture Toward The Coast Of British Columbia. This Enhanced
Moisture Content Will Quickly Interact With The Topography Over
The Region To Produce Very Heavy Rainfall. At This Point...The
Pacific Northwest Will Be Spared From The Heavier Precipitation As
The Best Onshore Flow Remains Directed North Of The U.S./Canadian
Border.

Rubin-Oster


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