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Severe T-Storm US Outlook Sep 24

Day 3 Convective Outlook
Nws Storm Prediction Center Norman Ok
0157 Am Cdt Wed Sep 22 2010

Valid 241200z - 251200z

...Synopsis...
Mid-Level Trough Moving Across The Upper Great Lakes At The Start Of The Period Is Progged To Continue Weakening With Time As It Shifts
Enewd Across Srn Ontario. As This Occurs...The Surface Low Will
Likewise Shift Enewd...With The Trailing Cold Front To Move Ewd
Across The Great Lakes/Oh Valley And More Slowly Sewd Across The Mid Ms Valley/Srn Plains Through The Afternoon.

Some Amplification Of The Flow Field Aloft Should Occur Late...As A
Weak Trough Moving Ewd Across Wrn Canada And The Nwrn U.S. Begins Digging Sewd Across The N Central Conus. As This
Occurs...Amplification Of The Downstream Wrn U.S. Ridge Is
Anticipated.

Showers And A Few Thunderstorms May Be Ongoing Along The Surface Cold Front From Il Swwd Across Mo/Ok And Into Tx At The Start Of The Period...With Scattered Convection Likely To Expand In Coverage Both Newd And Swwd Along The Front Through The Afternoon. Despite The Expansion In Coverage...Instability Is Progged To Be Very Limited Due To Weak Lapse Rate Environment. This Lack Of Instability Combined With Weak Flow Aloft Across All But The Nern U.S. Portion Of The Front Suggests That Severe Potential Should Remain Minimal Through The Period.


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