

069 

WWUS20 KWNS 291438

SEL9

SPC WW 291438

ARZ000-OKZ000-TXZ000-292100-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 209

NWS STORM PREDICTION CENTER NORMAN OK

940 AM CDT WED APR 29 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       PARTS OF SOUTHWEST ARKANSAS

       PARTS OF SOUTHEAST OKLAHOMA

       PARTS OF NORTHEAST TEXAS



EFFECTIVE THIS WEDNESDAY MORNING AND AFTERNOON FROM 940 AM UNTIL

400 PM CDT.



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 75

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 20 MILES NORTH

NORTHWEST OF SHERMAN TEXAS TO 55 MILES NORTHEAST OF TEXARKANA

ARKANSAS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).



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 208...



DISCUSSION...LARGE MCS OK WITH LEADING EWD MOVING SQUALL LINE

ALONG/N OF RED RIVER VALLEY.  WITH A VERY MOIST AND INCREASINGLY

UNSTABLE AIR MASS EWD INTO THE ARKLATEX REGION...EXPECT THE

THUNDERSTORMS WITHIN THE SQUALL LINE TO INTENSIFY WITH DAMAGING

WINDS THE PRIMARY THREAT.



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 550. MEAN STORM

MOTION VECTOR 27035.





...HALES

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