

000 

WWUS20 KWNS 142308

SEL7

SPC WW 142308

ILZ000-KSZ000-MOZ000-150500-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 517

NWS STORM PREDICTION CENTER NORMAN OK

610 PM CDT SAT JUL 14 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       WEST CENTRAL ILLINOIS

       FAR NORTHEAST KANSAS

       NORTHERN MISSOURI



EFFECTIVE THIS SATURDAY NIGHT FROM 610 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 40

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 30 MILES SOUTH OF

FALLS CITY NEBRASKA TO 30 MILES EAST NORTHEAST OF SPRINGFIELD

ILLINOIS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7).



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 516...



DISCUSSION...TSTMS FORMING IN MODERATELY SHEARED ENVIRONMENT ALONG

PRE-COLD FRONTAL TROUGH IN NRN MO MAY BECOME SUFFICIENTLY ORGANIZED

TO POSE A THREAT FOR HAIL/HIGH WIND AS ASSOCIATED UPR IMPULSE

CONTINUES SEWD.  SUSTAINED MULTICELLS AND PERHAPS A COUPLE EMBEDDED

SUPERCELLS MAY ENHANCE SVR THREAT THROUGH MID EVENING.



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 32025.





...CORFIDI

