

000 

WWUS20 KWNS 091954

SEL7

SPC WW 091954

ARZ000-OKZ000-TXZ000-100200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 497

NWS STORM PREDICTION CENTER NORMAN OK

255 PM CDT MON JUN 9 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       A LARGE PART OF ARKANSAS

       SMALL PART OF SOUTHEAST OKLAHOMA

       PARTS OF NORTHEAST TEXAS



EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 255 PM UNTIL 900

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 65

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 60 MILES WEST

NORTHWEST OF TYLER TEXAS TO 45 MILES SOUTHEAST OF BATESVILLE

ARKANSAS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7).



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 496...



DISCUSSION...THUNDERSTORMS INCREASING ALONG AND JUST AHEAD OF

OUTFLOW BOUNDARIES FROM RED RIVER VALLEY NEWD INTO AR.  WITH A VERY

MOIST AND MODERATELY UNSTABLE AIR MASS AVAILABLE AHEAD OF

BOUNDARIES...STORMS ARE EXPECTED TO INTENSIFY FURTHER WITH LARGE

HAIL AND DAMAGING DOWNBURSTS WINDS THE PRIMARY THREAT IN A MODESTLY

SHEARED ENVIRONMENT.



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 23020.





...HALES

