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URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 593

NWS STORM PREDICTION CENTER NORMAN OK

650 PM CDT TUE AUG 28 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTHWEST ALABAMA

       WESTERN FLORIDA PANHANDLE

       SOUTHEAST LOUISIANA

       SOUTHERN MISSISSIPPI

       COASTAL WATERS



EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 650 PM

UNTIL 700 AM CDT.



TORNADOES...HAIL TO 0.5 INCH IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 75 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 75 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 50 MILES NORTH NORTHWEST OF

HOUMA LOUISIANA TO 35 MILES NORTH NORTHEAST OF PANAMA CITY

FLORIDA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).



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 591...TORNADO WATCH NUMBER 592. WATCH NUMBER 591 592

WILL NOT BE IN EFFECT AFTER 650 PM CDT.



DISCUSSION...CONVECTION/STORMS APPEAR TO HAVE STRENGTHENED/INCREASED

IN COVERAGE OVER THE PAST 2-3 HRS NEAR CENTER OF HRCN ISAAC...NOW

LOCATED SSW OF BOOTHVILLE LA /BVE/. THE SYSTEM ALSO APPEARS TO HAVE

DEVELOPED MORE HIGH-LVL OUTFLOW. AS ISAAC CONTINUES SLOWLY

NWWD...THESE FACTORS COULD RESULT IN INCREASINGLY MOISTURE-RICH

LOW-LVL AIR BEING DRAWN N AND NWWD TO E OF CIRCULATION CENTER.

AREA VWP DATA SHOW ENVELOPE OF WIND PROFILES FAVORABLE FOR LOW-LVL

ROTATION/POSSIBLE TORNADOES EXTENDING WELL N /INLAND/ AND E FROM

CENTER OF ISAAC. WITH LOSS OF DAYTIME HEATING...HOWEVER...EXPECT

THAT AREAS FOR POTENTIAL SHOWER/TSTM DEVELOPMENT THROUGH THE

OVERNIGHT WILL CONTRACT SOMEWHAT TOWARD ISAAC/S CORE...INTO EXISTING

AND FUTURE CONFLUENCE BANDS E AND N OF CIRCULATION CENTER.

AN INCREASE IN DEEP-LAYER MOISTURE MAY MAKE STORMS IN THE CONFLUENCE

BANDS SOMEWHAT LESS OUTFLOW-DOMINANT THAN THEY HAVE BEEN OVER THE

PAST TWO DAYS. THIS COULD BE FOLLOWED BY AN INCREASING RISK FOR

TORNADOES IF CONVECTION DOES CONTINUE TO FORM ALONG THE BANDS.



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

SURFACE AND ALOFT TO 0.5 INCH. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 65 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

500. MEAN STORM MOTION VECTOR 15040.





...CORFIDI

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