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WWUS20 KWNS 190441

SEL7

SPC WW 190441

ILZ000-INZ000-KSZ000-MOZ000-191000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 347

NWS STORM PREDICTION CENTER NORMAN OK

1140 PM CDT FRI JUN 18 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       CENTRAL ILLINOIS

       NORTHERN AND CENTRAL INDIANA

       EXTREME EASTERN KANSAS

       PARTS OF NORTHERN MISSOURI



EFFECTIVE THIS FRIDAY NIGHT AND SATURDAY MORNING FROM 1140 PM

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 55

STATUTE MILES NORTH AND SOUTH OF A LINE FROM KANSAS CITY MISSOURI

TO 35 MILES EAST NORTHEAST OF MUNCIE INDIANA.  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 345...WW 346...



DISCUSSION...EXTENSIVE ZONE OF DEEP CONVECTION IS EXPECTED TO

PERSIST ALONG OUTFLOW-REINFORCED BOUNDARY/WARM FRONT FROM ERN KS TO

IL/IND. 20-35KT LOW LEVEL JET IS EXPECTED TO MAINTAIN ASCENT ACROSS

THIS BOUNDARY THROUGH THE EARLY PART OF SATURDAY MORNING. VERY WARM

AND MOIST AIRMASS FEEDING INTO THE REGION OF STRONGER ASCENT SHOULD

MAINTAIN STOUT UPDRAFTS IN AN REGION ALONG THE SRN FRINGES OF

STRONGER MID LEVEL FLOW. STORM MOTION VECTORS ACROSS MUCH OF THIS

ZONE ARE DOMINATED BY THE STRONGER LOW LEVEL INFLOW SUGGESTING ONLY

A GRADUAL SWD/SWWD PROPAGATION...WHILE ERN AREAS MAY SEE A MORE

PROGRESSIVE FORWARD PROPAGATION. MAGNITUDE OF MID LEVEL LAPSE RATES

AND OVERALL AMBIENT INSTABILITY SUPPORTS AN ISOLATED HAIL AND WIND

THREAT...AS WELL AS EXCESSIVE RAINFALL FROM REPEAT/TRAINING ECHOES.



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.





...CARBIN

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