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URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 772

NWS STORM PREDICTION CENTER NORMAN OK

1200 PM CDT THU OCT 22 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       MUCH OF EASTERN LOUISIANA

       PARTS OF SOUTHWESTERN MISSISSIPPI

       COASTAL WATERS



EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM NOON UNTIL 700

PM CDT.



TORNADOES...HAIL TO 0.5 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 65 STATUTE

MILES EAST AND WEST OF A LINE FROM 40 MILES NORTH NORTHEAST OF

MONROE LOUISIANA TO 35 MILES SOUTH OF INTRACOASTAL CITY

LOUISIANA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).



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 771. WATCH NUMBER 771 WILL NOT BE IN EFFECT AFTER

NOON CDT.



DISCUSSION...VERY MOIST WARM SECTOR CONTINUES TO SPREAD NWD UP THE

LWR MS RIVER VALLEY AHEAD OF A COLD FRONT AND GRADUALLY DEEPENING

SURFACE LOW ALONG TX/LA BORDER.  STRONG SHEAR PROFILES AND

SUFFICIENT INSTABILITY WILL CONTINUE TO SUPPORT SUPERCELLS AND

ISOLATED TORNADOES ALONG AND AHEAD OF N/S SQUALL LINE ACROSS WRN LA.

THREAT AREA WILL ALSO DEVELOP FURTHER N DURING THE AFTERNOON ALONG

WITH THE WARM SECTOR.



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

SURFACE AND ALOFT TO 0.5 INCH. EXTREME TURBULENCE AND SURFACE

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

500. MEAN STORM MOTION VECTOR 19035.





...HALES

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