

486 

WWUS20 KWNS 041236

SEL8

SPC WW 041236

ALZ000-FLZ000-LAZ000-MSZ000-CWZ000-041900-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 238

NWS STORM PREDICTION CENTER NORMAN OK

735 AM CDT MON MAY 4 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTHERN ALABAMA

       CENTRAL AND WESTERN FLORIDA PANHANDLE

       SOUTHEASTERN LOUISIANA

       SOUTHEASTERN MISSISSIPPI

       COASTAL WATERS



EFFECTIVE THIS MONDAY MORNING AND AFTERNOON FROM 735 AM UNTIL 200

PM CDT.



TORNADOES...HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS

TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 55 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 25 MILES WEST NORTHWEST OF

HOUMA LOUISIANA TO 20 MILES SOUTH SOUTHEAST OF DOTHAN ALABAMA.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU8).



REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR

TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH

AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR

THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS

AND POSSIBLE WARNINGS.



OTHER WATCH INFORMATION...THIS TORNADO WATCH REPLACES TORNADO

WATCH NUMBER 237. WATCH NUMBER 237 WILL NOT BE IN EFFECT AFTER

735 AM CDT.



DISCUSSION...BAND OF STG-SVR TSTMS -- INCLUDING A FEW

HEAVY-PRECIPITATION SUPERCELLS AND SMALL BOWS -- IS FCST TO MOVE

ESEWD ACROSS WW AREA THROUGH REMAINDER MORNING.  VERTICAL SHEAR

PROFILES WILL REMAIN FAVORABLE INVOF OLD OUTFLOW BOUNDARY LEFT

BEHIND BY DERECHO-PRODUCING MCS OF PREVIOUS DAY.  MEANWHILE

MARITIME/TROPICAL AIR MASS IN PROSPECTIVE INFLOW LAYER...WHICH

ALREADY APPEARS TO BE NEARLY UNCAPPED FOR SFC-BASED PARCELS...WILL

BE SUBTLY HEATED AND DESTABILIZED FURTHER IN ADVANCE OF CONVECTION.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND

GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500.

MEAN STORM MOTION VECTOR 24025.





...EDWARDS/EVANS

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