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000 

WWUS20 KWNS 220053

SEL1

SPC WW 220053

ALZ000-LAZ000-MSZ000-220800-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 71

NWS STORM PREDICTION CENTER NORMAN OK

655 PM CST THU FEB 21 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       PARTS OF WESTERN ALABAMA

       PARTS OF NORTHERN LOUISIANA

       PARTS OF CENTRAL AND SOUTHERN MISSISSIPPI



EFFECTIVE THIS THURSDAY NIGHT AND FRIDAY MORNING FROM 655 PM

UNTIL 200 AM CST.



HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70

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



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 55

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 40 MILES NORTH

NORTHWEST OF NATCHITOCHES LOUISIANA TO 75 MILES EAST OF MERIDIAN

MISSISSIPPI.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).



REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE

FAVORABLE FOR 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. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY

DO PRODUCE TORNADOES.



OTHER WATCH INFORMATION...CONTINUE...WW 70...



DISCUSSION...00Z SOUNDINGS FROM JAN/SHV INDICATED FAVORABLE ELEVATED

SHEAR AND INSTABILITY FOR SEVERE THUNDERSTORMS.  PRIMARY THREAT WILL

BE LARGE HAIL...HOWEVER SHORT LINES/BOWS ARE POSSIBLE GIVEN THE

STRONG MID/UPPER WIND FIELDS WITH ASSOCIATED DAMAGING WINDS.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. MEAN STORM

MOTION VECTOR 24030.





...HALES

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