

229 

WWUS20 KWNS 102157

SEL8

SPC WW 102157

ILZ000-KSZ000-MOZ000-OKZ000-110500-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 458

NWS STORM PREDICTION CENTER NORMAN OK

500 PM CDT FRI JUN 10 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       WEST CENTRAL ILLINOIS

       SOUTHEAST KANSAS

       CENTRAL AND SOUTHWEST MISSOURI

       NORTHERN OKLAHOMA



EFFECTIVE THIS FRIDAY AFTERNOON FROM 500 PM UNTIL MIDNIGHT 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 75

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

SOUTHWEST OF ENID OKLAHOMA TO 55 MILES EAST SOUTHEAST OF QUINCY

ILLINOIS.  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 457...



DISCUSSION...A MOIST AND MODERATELY UNSTABLE AIR MASS IS PRESENT

ACROSS A BROAD ZONE FROM NORTHERN OK INTO CENTRAL MO.  VISIBLE

SATELLITE TRENDS SUGGEST THIS AREA WILL LIKELY SEE SCATTERED

THUNDERSTORM DEVELOPMENT IN THE NEXT 1-2 HOURS.  FAVORABLE VERTICAL

SHEAR PROFILES AND LOW LEVEL CONVERGENCE WILL PROMOTE A FEW SEVERE

STORMS CAPABLE OF LARGE HAIL AND DAMAGING WINDS.



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 27030.





...HART

