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000 

WWUS20 KWNS 221934

SEL6

SPC WW 221934

ARZ000-LAZ000-MSZ000-OKZ000-230200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 216

NWS STORM PREDICTION CENTER NORMAN OK

235 PM CDT TUE APR 22 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       LARGE PART OF CENTRAL AND SOUTHERN ARKANSAS

       SMALL PART OF NORTHEAST LOUISIANA

       PARTS OF WESTERN MISSISSIPPI

       SMALL PART OF SOUTHEASTERN OKLAHOMA



EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 235 PM UNTIL

900 PM CDT.



HAIL TO 2.5 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 65

STATUTE MILES EITHER SIDE OF A LINE FROM 45 MILES NORTH OF DE

QUEEN ARKANSAS TO 50 MILES EAST OF GREENVILLE MISSISSIPPI.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU6).



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...THIS SEVERE THUNDERSTORM WATCH REPLACES

SEVERE THUNDERSTORM WATCH NUMBER 214. WATCH NUMBER 214 WILL NOT

BE IN EFFECT AFTER 235 PM CDT. CONTINUE...WW 215...



DISCUSSION...COLD POOL DRIVEN THUNDERSTORMS CONTINUE SWD VICINITY MS

RIVER VALLEY WHERE AIR MASS IS NOW VERY UNSTABLE DOWNSTREAM.

ADDITIONALLY THUNDERSTORMS EXPECTED TO DEVELOP ACROSS NWRN AR/ERN OK

AHEAD OF COLD FRONT AND PROPAGATE SEWD ACROSS AR THRU THIS EVENING.

PRIMARY THREAT WILL BE LARGE HAIL AND LOCAL DAMAGING

WINDS...PARTICULARLY ASSOCIATED WITH STORMS CLUSTERS.



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

TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM

MOTION VECTOR 32025.





...HALES

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