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000 

WWUS20 KWNS 230538

SEL8

SPC WW 230538

ARZ000-KSZ000-MOZ000-OKZ000-231100-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 598

NWS STORM PREDICTION CENTER NORMAN OK

1240 AM CDT MON JUN 23 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHWEST INTO NORTH CENTRAL ARKANSAS

       EASTERN KANSAS

       SOUTHWESTERN MISSOURI

       NORTHEAST OKLAHOMA



EFFECTIVE THIS MONDAY MORNING FROM 1240 AM UNTIL 600 AM 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 60

STATUTE MILES EAST AND WEST OF A LINE FROM 55 MILES NORTH

NORTHWEST OF EMPORIA KANSAS TO 30 MILES SOUTH SOUTHWEST OF

HARRISON ARKANSAS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).



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 597...



DISCUSSION...BACK-BUILDING MCS WILL PERSIST ACROSS THIS REGION FOR

SEVERAL HOURS WITHIN VERY UNSTABLE AIR MASS DEPICTED BY MUCAPE IN

EXCESS OF 2000 J/KG.  EFFECTIVE SHEAR WILL ALSO SUPPORT SUPERCELL

STRUCTURES WHICH WILL ENHANCE THE POTENTIAL FOR LARGE HAIL.

ISOLATED DAMAGING WINDS WILL BE ADDITIONAL HAZARD...ALTHOUGH EXPECT

MOST OF THE ACTIVITY TO REMAIN ELEVATED.  HEAVY RAINFALL IS ALSO

EXPECTED AS STORMS TRAIN AS THEY MOVE SSEWD.



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 500. MEAN STORM

MOTION VECTOR 32020.





...EVANS

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