SWODY3
SPC AC 200726
DAY 3 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0226 AM CDT TUE SEP 20 2011
VALID 221200Z - 231200Z
...SYNOPSIS...
A LARGE/SHARP UPPER TROUGH MOVING ACROSS THE CENTRAL U.S. WILL BE
THE PRIMARY UPPER FEATURE OF INTEREST THIS PERIOD...WITH RIDGING
OVER MUCH OF THE WEST AND OFF THE E COAST. AS THIS TROUGH SHIFTS
SLOWLY EWD TO THE MS VALLEY...AN ASSOCIATED SURFACE COLD FRONT WILL
LIKEWISE TO PROGRESS SLOWLY ACROSS THE OH/TN VALLEYS AND CENTRAL
GULF COAST REGION THROUGH THE DAY...WITH THE FRONT REACHING THE
VICINITY OF THE APPALACHIANS OVERNIGHT.
SHOWERS AND SCATTERED THUNDERSTORMS ARE FORECAST ACROSS THE ERN
THIRD OF THE U.S. THIS PERIOD...BOTH INVOF THE FRONT AND AHEAD OF
THE BOUNDARY BENEATH BROAD CYCLONIC MID-LEVEL FLOW. OVERALL
INSTABILITY IS FORECAST TO BE LIMITED -- PARTICULARLY N OF THE TN
VALLEY WHERE SOMEWHAT STRONGER FLOW ALOFT IS FORECAST.
MEANWHILE...MUCH WEAKER MID-LEVEL WINDS ATOP THE MORE MOIST/UNSTABLE
AIRMASS OVER THE SOUTHEAST AND E COAST REGION SUGGESTS THAT STORMS
ACROSS THE ENTIRE WARM SECTOR OF THE SYNOPTIC SYSTEM SHOULD REMAIN
FOR THE MOST PART SUB-SEVERE THROUGH THE PERIOD.
..GOSS.. 09/20/2011
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