

751 

WWUS20 KWNS 121833

SEL2

SPC WW 121833

ILZ000-MOZ000-130000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 302

NWS STORM PREDICTION CENTER NORMAN OK

135 PM CDT SAT JUN 12 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTH-CENTRAL ILLINOIS

       EASTERN MISSOURI



EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 135 PM UNTIL

700 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 40

STATUTE MILES EITHER SIDE OF A LINE FROM 10 MILES WEST NORTHWEST

OF COLUMBIA MISSOURI TO 50 MILES SOUTHEAST OF MATTOON ILLINOIS.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU2).



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 301...



DISCUSSION...VERY MOIST AND UNSTABLE AIRMASS WILL FUEL ADDITIONAL

THUNDERSTORM DEVELOPMENT THROUGH THE AFTERNOON ACROSS THE MIDDLE MS

RIVER VALLEY. THESE STORMS WILL TEND TO FOCUS AHEAD OF SLOWLY

ADVANCING COLD FRONT...NOW ACROSS CENTRAL MO...WITH MORE SCATTERED

WARM SECTOR DEVELOPMENT OCCURRING OVER SCNTRL IL. MID LEVEL FLOW

AROUND 30KT WILL PROMOTE MARGINAL STORM ORGANIZATION. GIVEN

MAGNITUDE OF DESTABILIZATION AND ANTICIPATED STORM

COVERAGE...NUMEROUS HAIL AND HIGH WIND EVENTS APPEAR LIKELY.



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 23020.





...CARBIN

