ACUS02 KWNS 290456
SWODY2
SPC AC 290455
DAY 2 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1155 PM CDT TUE AUG 28 2012
VALID 301200Z - 311200Z
...THERE IS A SLGT RISK OF SVR TSTMS ACROSS MUCH OF LA...WRN MS AND
FAR SRN AR...
...SYNOPSIS...
AN UPPER RIDGE WILL STRETCH FROM THE FOUR CORNERS STATES EWD TO THE
APPALACHIANS ON THU WITH TROPICAL SYSTEM ISAAC AFFECTING THE LOWER
MS VALLEY AREA. THE STRONGER FLOW WILL BE ACROSS THE NRN U.S. WITH A
LOW AMPLITUDE SHORTWAVE TROUGH AFFECTING THE UPPER MS VALLEY/GREAT
LAKES REGION BUT WITH LITTLE MOISTURE FOR STORMS. A GREATER THREAT
FOR THUNDERSTORMS WILL BE ACROSS AZ INTO THE GREAT BASIN AS MOISTURE
STREAMS NWD AROUND THE UPPER RIDGE.
...LA...SWRN MS...SRN AR...
ISAAC IS EXPECTED TO BE IN A WEAKENING PHASE AS IT CONTINUES NWWD
ACROSS LA AND INTO SRN AR BY THU EVENING. SUBSTANTIAL WIND FIELDS
WILL STILL EXIST AROUND THIS SYSTEM ALONG WITH MINIMAL INSTABILITY.
AS SUCH...A FEW BRIEF TORNADOES MAY OCCUR WITH SOME OF THE STRONGER
CELLS WITHIN THE RAIN BANDS MAINLY ALONG AND JUST E OF THE CENTER OF
CIRCULATION WHERE THE STRONGEST SHEAR AND FORCING WILL COEXIST.
...CNTRL MN INTO NRN WI AND UPPER MI...
A WEAK SFC TROUGH WILL TRAIL SWWD ACROSS NRN WI INTO SRN MN BY LATE
AFTERNOON. WEAK CONVERGENCE AND HEATING NEAR THE BOUNDARY MAY ALLOW
FOR A NARROW AXIS OF INSTABILITY TO DEVELOP...WITH ISOLATED
THUNDERSTORMS BY PEAK HEATING. VERY LITTLE MOISTURE WILL BE PRESENT
BUT MODEST WIND FIELDS A WELL AS VERY DRY AIR IN THE LOW LEVELS
COULD SUPPORT SOME STRONGER WIND GUSTS.
..JEWELL.. 08/29/2012
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