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URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 771

NWS STORM PREDICTION CENTER NORMAN OK

555 AM CDT THU OCT 22 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTHERN AND WESTERN LOUISIANA

       SOUTHEAST TEXAS

       COASTAL WATERS



EFFECTIVE THIS THURSDAY MORNING AND AFTERNOON FROM 555 AM UNTIL

100 PM CDT.



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

GUSTS TO 60 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 60 STATUTE

MILES EAST AND WEST OF A LINE FROM 15 MILES NORTH NORTHWEST OF

NATCHITOCHES LOUISIANA TO 45 MILES EAST OF GALVESTON TEXAS.  FOR

A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU1).



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.



DISCUSSION...TSTMS HAVE INCREASED IN THE PAST 1-2 HOURS OVER THE

NWRN GULF AND ADJACENT SE TX.  THIS ACTIVITY IS FORMING IN VERY

MOIST AIR ALONG A WEAK NNW/SSE WARM FRONT...AND BENEATH BAND OF

ENHANCED MID LVL SW FLOW ASSOCIATED WITH REMNANTS OF FORMER T.C.

RICK /REF MCD 2122/.  LOW-BASED STORMS SHOULD CONTINUE TO FORM IN

CONFLUENT LOW LVL FLOW INVOF OF THE FRONT AS IT MOVES SLOWLY EWD

THROUGH MIDDAY.  AREA WIND PROFILES APPEAR SUPPORTIVE OF LOW LVL

ROTATION/TORNADOES...AND POSSIBLY LOCALLY DMGG WIND GUSTS.



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

SURFACE AND ALOFT TO 0.5 INCH. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 50 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

450. MEAN STORM MOTION VECTOR 19040.





...CORFIDI

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