SWODY2
SPC AC 211715
DAY 2 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1215 PM CDT THU MAY 21 2009
VALID 221200Z - 231200Z
...NO SVR TSTM AREAS FORECAST...
AN UPPER-LEVEL LOW OVER THE ERN GULF OF MEXICO TONIGHT WILL DRIFT
WNWWD INTO THE NRN GULF OF MEXICO. RAINBANDS AROUND THE UPPER-LEVEL
LOW WILL LIKELY REMAIN JUST OFFSHORE THROUGH MUCH OF THE DAY FRIDAY.
THUNDERSTORMS MAY MOVE INTO THE MS RIVER DELTA BY LATE FRIDAY
AFTERNOON OR DURING THE EVENING. THIS ACTIVITY IS FORECAST TO AFFECT
PORTIONS OF SRN MS...SRN AL AND THE FL PANHANDLE OVERNIGHT. FORECAST
SOUNDINGS IN COASTAL SECTIONS OF THE CNTRL GULF COAST STATES FRIDAY
NIGHT SUGGEST ENOUGH INSTABILITY WHICH COMBINED WITH STRENGTHENING
LOW-LEVEL FLOW COULD BE ENOUGH FOR A FEW STRONG THUNDERSTORMS
CAPABLE OF ISOLATED DAMAGING WIND GUSTS. HOWEVER...THE THREAT IS
EXPECTED TO REMAIN TOO ISOLATED TO WARRANT AN OUTLOOK AREA.
IN THE CNTRL HIGH PLAINS...ISOLATED THUNDERSTORM DEVELOPMENT WILL
ALSO BE POSSIBLE FRIDAY AFTERNOON ALONG A FRONTAL BOUNDARY IN SRN WY
AND WRN NEB. FORECAST SOUNDINGS FRIDAY AFTERNOON IN WRN NEB SHOW
RELATIVELY WEAK VERTICAL SHEAR PROFILES WHICH WILL LIMIT UPDRAFT
ORGANIZATION. IF A CONVECTIVE CLUSTER CAN PERSIST INTO THE EVENING
AS LOW-LEVEL FLOW INCREASES...THE STEEP MID-LEVEL LAPSE RATES COULD
SUPPORT A THREAT FOR SMALL HAIL. ATTM...THE POTENTIAL FOR A
PERSISTENT SEVERE THREAT REMAINS VERY LOW.
..BROYLES.. 05/21/2009
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