

000 

WWUS20 KWNS 090622

SEL5

SPC WW 090622

ARZ000-KSZ000-MOZ000-OKZ000-091000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 285

NWS STORM PREDICTION CENTER NORMAN OK

125 AM CDT FRI MAY 9 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       PARTS OF NORTHWEST ARKANSAS

       SMALL PART OF SOUTHEAST KANSAS

       PARTS OF SOUTHERN MISSOURI

       PARTS OF NORTHEAST OKLAHOMA



EFFECTIVE THIS FRIDAY MORNING FROM 125 AM UNTIL 500 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 50

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 40 MILES WEST

NORTHWEST OF GROVE OKLAHOMA TO 35 MILES NORTHEAST OF HARRISON

ARKANSAS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU5).



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 283...WW 284...



DISCUSSION...CLUSTER OF SEVERE TSTMS VICINITY SERN KS/OK BORDER IS

DRIVEN BY UPPER  S/WV TROUGH AND ASSOCIATED WIND MAX.  ALTHOUGH

INSTABILITY APPEARS MARGINAL...STEEP MID LEVEL LAPSE RATES AND

STRONG VEERING SHEAR PROFILES WILL SUPPORT ORGANIZED STORMS

INCLUDING SUPERCELL STRUCTURES ACROSS THE WATCH AREA.



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 500. MEAN STORM

MOTION VECTOR 27035.





...HALES

