

194 

WWUS20 KWNS 272255

SEL9

SPC WW 272255

ILZ000-KSZ000-MOZ000-280400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 529

NWS STORM PREDICTION CENTER NORMAN OK

555 PM CDT SAT JUN 27 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       PARTS OF WEST CENTRAL ILLINOIS

       SMALL PART OF EAST KANSAS

       PARTS OF NORTHERN AND CENTRAL MISSOURI



EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 555 PM UNTIL

1100 PM 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 55 MILES SOUTH

SOUTHWEST OF OLATHE KANSAS TO 30 MILES EAST OF QUINCY ILLINOIS.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU9).



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 525...WW 526...WW

527...WW 528...



DISCUSSION...SCATTERED THUNDERSTORMS EXPECTED TO DEVELOP ALONG AND

JUST AHEAD OF A WEAK FRONTAL BAND ACROSS NRN MO INTO ERN KS.  AIR

MASS IS VERY UNSTABLE WITH MLCAPES AOA 3000 J/KG.  ADDITIONALLY

DCAPES UPWARDS TO 1500 J/KG FAVOR DAMAGING DOWNBURST WINDS WITH ANY

STRONG UPDRAFT.  LACK OF FAVORABLE DEEP LAYER SHEAR SHOULD SUPPORT

PRIMARILY PULSE TYPE DEVELOPMENT.  INTENSITIES SHOULD DIMINISH AFTER

SUNSET.



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 27020.





...HALES

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