

555 

WWUS20 KWNS 222136

SEL3

SPC WW 222136

LAZ000-MSZ000-CWZ000-230300-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 773

NWS STORM PREDICTION CENTER NORMAN OK

435 PM CDT THU OCT 22 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTHEAST LOUISIANA

       SOUTHERN MISSISSIPPI

       COASTAL WATERS



EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 435 PM UNTIL

1000 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 75 STATUTE

MILES EAST AND WEST OF A LINE FROM 45 MILES NORTH NORTHEAST OF

SLIDELL LOUISIANA TO 50 MILES SOUTHWEST OF BOOTHVILLE LOUISIANA.

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...CONTINUE...WW 772...



DISCUSSION...LINE OF STRONG THUNDERSTORMS CONTINUES TO TRACK

EASTWARD ACROSS SOUTHERN LA...AND WILL BEGIN TO AFFECT SOUTHERN MS

THIS EVENING.  LOW LEVEL VERTICAL SHEAR REMAINS FAVORABLE FOR A FEW

SUPERCELLS EMBEDDED IN...OR OUT AHEAD OF THE MAIN LINE.  VERY MOIST

BOUNDARY LAYER AND MLCAPE VALUES AROUND 500 J/KG MAY BE SUFFICIENT

FOR A FEW TORNADOES THIS EVENING.



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 450.

MEAN STORM MOTION VECTOR 24035.





...HART

