Severe T-Storm US Outlook Sep 19

Day 3 (Sun) Convective Outlook
Nws Storm Prediction Center Norman Ok
0217 Am Cdt Fri Sep 17 2010

Valid 191200z - 201200z

...Synopsis...
Large-Scale Pattern Amplification Is Forecast Over The U.S. This
Period...As The Large Canadian Vortex Continues Slowly Ewd With Time And Expands Swd Somewhat Across The Northeast Conus...While The Ern Pacific Trough Begins Moving Onshore Over The West. This Increase In Troughing Over The Northeast U.S. Combined With Ewd Progression Of The Wrn Trough Will Result In Strengthening/Nwd Expansion Of The Central U.S. Ridge.

At The Surface...A Cold Front Is Progged To Shift Across The Great
Basin And Vicinity Ahead Of The Wrn Upper System. Meanwhile...A
Weakening Front Associated With The Ern Canada Vortex Will Cross New England...While The Trailing Portion Of This Boundary Remains Draped E-W Across The Midwest/Central Plains Region.

Convection Is Expected Across Parts Of The West Invof The Advancing Upper System...While Showers And Scattered Storms Will Also Likely Persist Across The Midwest/Oh Valley Region Invof The Remnant Surface Front. Weak Instability Precludes Appreciable Severe
Potential Across The West...While A Similar Lack Of Favorable
Instability And Shear -- Combined With Increasing Large-Scale
Subsidence Beneath The Expanding Upper Ridge -- Suggests Minimal
Threat Over The Central Conus Through The Period.

..Goss.. 09/17/2010


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