734
ACUS03 KWNS 210728
SWODY3
SPC AC 210725
DAY 3 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0125 AM CST FRI NOV 21 2008
VALID 231200Z - 241200Z
..NO SVR TSTM AREAS FORECAST
..SYNOPSIS
A DEEP UPPER LOW IS FORECAST TO DIG FROM MANITOBA/SASKATCHEWAN SEWD
INTO THE WRN GREAT LAKES BY LATE SUNDAY. AN INTENSE SHORTWAVE TROUGH
WILL EXTEND SWD FROM THIS LOW AND MOVE EWD FROM THE PLAINS STATES
INTO MS/WRN TN/OH VALLEYS. A WEAK FRONT WILL ACCOMPANY THE TROUGH
AND SHOULD STRETCH ROUGHLY FROM THE CENTRAL GREAT LAKES SSWWD
THROUGH THE MIDDLE MS VALLEY AND INTO ERN/SRN TX BY DAYBREAK MONDAY.
..AR/WRN TN NEWD INTO THE WRN OH VALLEY
AHEAD OF THE APPROACHING UPPER TROUGH/COLD FRONT...SLY WINDS ARE
EXPECTED TO ADVECT LOWER TO MID 50 DEWPOINTS INTO THE MID MS VALLEY
SUNDAY NIGHT. THIS INCREASED MOISTURE COMBINED WITH FRONTAL
CONVERGENCE AND INCREASING UVV/S SHOULD BE SUFFICIENT FOR CONVECTION
TO DEVELOP NEAR THE FRONT LATE IN THE PERIOD. DESPITE DEEP LAYER
SHEAR AT 50KT...WEAK INSTABILITY AND POOR MID LEVEL LAPSE RATES
INDICATES ANY SEVERE THREAT WOULD BE VERY LIMITED.
..IMY.. 11/21/2008
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