

251 

WWUS20 KWNS 212346

SEL6

SPC WW 212346

ARZ000-OKZ000-220600-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 536

NWS STORM PREDICTION CENTER NORMAN OK

645 PM CDT TUE JUN 21 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       WESTERN AND CENTRAL ARKANSAS

       SOUTHEAST OKLAHOMA



EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 645 PM

UNTIL 100 AM 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 EAST AND WEST OF A LINE FROM 25 MILES NORTH

NORTHWEST OF RUSSELLVILLE ARKANSAS TO 45 MILES WEST SOUTHWEST OF

DE QUEEN ARKANSAS.  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...CONTINUE...WW 531...WW 532...WW

533...WW 534...WW 535...



DISCUSSION...WDLY SCTD TSTMS EXPECTED TO FORM ALONG/MOVE E FROM

NEARLY STNRY SW-NE BOUNDARY OVER SE OK/WRN AR...WHERE AMPLE

SBCAPE...MOISTURE...AND 30-40 DEEP WLY SHEAR ARE PRESENT FOR

SUPERCELLS WITH SVR HAIL/WIND.  LATER THIS EVE...STORMS ALSO MAY

PROPAGATE NEWD ALONG SAME BOUNDARY ACROSS N CNTRL/NE TX...FROM

DEVELOPING STORM CLUSTER NOW IN CNTRL TX.  SUCH DEVELOPMENT MAY

REQUIRE LOCAL EXTENSION OF WW 534 /SVR WATCH ALREADY IN PLACE FROM

THE DFW AREA SWD/ NWD TO THE RED RVR.



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 25025.





...CORFIDI

