Weather Sep 15 US Short Term Outlook Through Sep 17

Short Range Forecast Discussion
Nws Hydrometeorological Prediction Center Camp Springs Md
343 Am Edt Wed Sep 15 2010

Valid 12z Wed Sep 15 2010 - 12z Fri Sep 17 2010

Most Of The Precipitation Action For The U.S. Will Be Setting Up
Wednesday Morning Over The Great Plains. The Front That Has Been
Hanging Out Across The Central Plains And Midwest Over The Past
Couple Of Days Will Finally Get A Bit Of An Eastward Push As A
Weak Upper-Level Energy Max Moves Across The Plains Late
Wednesday. The Western Portion Of The Boundary Will Drive
Southward Late Wednesday Into Thursday As A Packet Of Mid-Level
Energy From The Northern Rockies Is Pushed Southeastward Ahead Of
A Second Much Stronger Upper-Level Disturbance. Heavy Rain And
Thunderstorms Will Develop Over The Upper Mississippi Valley And
Midwestern States...Bringing Much Needed Rain To An Area Of The
Country That Has Seen Very Little Precipitation In Recent Weeks.

To The North One Of The First Powerful Cold Systems Of The Season
Is Taking Shape. A Very Strong Upper-Level Maximum Of Energy Is
Diving Southward From Northwestern Canada. Very Cold Air Will
Accompany This Disturbance As It Heads Towards The Norther Tier Of
The U.S. Thursday Morning. A Second Upper-Level Disturbance Over
The Pacific Will Move Inland At Approximately The Same
Time...Bringing Ample Moisture To Southwestern Canada. Most Of The
Heavy Precipitation Will Stay To The North In Canada In The Short
Term...Not Reaching The Northern Plains Until Late Thursday.

Collins


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