

000 

WWUS20 KWNS 092136

SEL0

SPC WW 092136

ARZ000-OKZ000-100300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 500

NWS STORM PREDICTION CENTER NORMAN OK

440 PM CDT MON JUL 9 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHWEST ARKANSAS

       CENTRAL AND EASTERN OKLAHOMA



EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 440 PM UNTIL

1000 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 100

STATUTE MILES EAST AND WEST OF A LINE FROM 15 MILES SOUTHWEST OF

DURANT OKLAHOMA TO 45 MILES NORTHEAST OF CHANDLER OKLAHOMA.  FOR

A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU0).



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 495...WW 496...WW

497...WW 498...WW 499...



DISCUSSION...LARGE CLUSTERS OF THUNDERSTORMS HAVE RAPIDLY DEVELOPED

IN THE PAST HOUR ACROSS PORTIONS OF CENTRAL AND EASTERN OK.  THESE

STORMS ARE IN REGION OF EXTREME INSTABILITY...ALONG WITH WEAK BUT

SUFFICIENT MID LEVEL FLOW TO SUSTAIN MULTICELL UPDRAFTS AND SUPPORT

SEVERE RISK.  LOCALLY DAMAGING WINDS AND HAIL ARE THE MAIN THREATS.



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 600. MEAN STORM

MOTION VECTOR 29020.





...HART

