

000 

WWUS20 KWNS 011338

SEL4

SPC WW 011338

ARZ000-MOZ000-OKZ000-012000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 414

NWS STORM PREDICTION CENTER NORMAN OK

835 AM CDT SUN JUN 1 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHWEST ARKANSAS

       FAR SOUTHWESTERN MISSOURI

       NORTHEAST OKLAHOMA



EFFECTIVE THIS SUNDAY MORNING AND AFTERNOON FROM 835 AM UNTIL 300

PM 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 55

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 45 MILES WEST

SOUTHWEST OF BARTLESVILLE OKLAHOMA TO 30 MILES NORTHEAST OF

RUSSELLVILLE ARKANSAS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE

THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4).



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 411...WW 413...



DISCUSSION...STRONG MCS EVOLVING OVER NERN OK WILL LIKELY TRACK

ESEWD THROUGH THE MORNING/EARLY AFTERNOON AS RIDGING ALOFT BUILDS

OVER THE SRN ROCKIES.  ACTIVITY IS EXPECTED TO TRACK ALONG SURFACE

THETA-E GRADIENT INTO NWRN AR/POSSIBLY FAR SWRN MO...WITH VERY STEEP

LAPSE RATES AND SUFFICIENT EFFECTIVE SHEAR FOR VERY LARGE HAIL WITH

THE STRONGER CORES.  THIS MCS MAY BECOME ORIENTED ALONG LEADING EDGE

OF A COMMON COLD POOL DURING THE MID MORNING HOURS AND INCREASE THE

THREAT OF DAMAGING WINDS AS IT ORGANIZES INTO A BOWING MCS.



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 29030.





...EVANS

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