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102 

WWUS20 KWNS 190110

SEL6

SPC WW 190110

IAZ000-ILZ000-INZ000-MOZ000-LMZ000-190500-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 346

NWS STORM PREDICTION CENTER NORMAN OK

805 PM CDT FRI JUN 18 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHEAST IOWA

       NORTHWEST ILLINOIS

       NORTHWEST INDIANA

       NORTHEAST MISSOURI

       LAKE MICHIGAN



EFFECTIVE THIS FRIDAY NIGHT FROM 805 PM UNTIL MIDNIGHT CDT.



HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 80

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 45 MILES WEST

SOUTHWEST OF KIRKSVILLE MISSOURI TO 5 MILES NORTH NORTHEAST OF

VALPARAISO INDIANA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE

THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).



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 343...WW 344...WW 345...



DISCUSSION...ANOTHER INTENSE QUASI-LINEAR MCS WILL SPREAD

EAST/SOUTHEAST ACROSS NRN IL AND SERN IA THIS EVENING. THIS

DEVELOPMENT IS OCCURRING ALONG AND NORTH OF OUTFLOW-REINFORCED

BOUNDARY FROM NRN MO INTO WRN/CNTRL IL. VERY HOT AND UNSTABLE

AIRMASS ALONG AND SOUTH OF THE OUTFLOW CONTINUES TO FEED STORMS

WITHIN MODERATELY SHEARED DEEP-LAYER FLOW. EXPECT FLANKING LINE TO

CONTINUE TO BACKBUILD ACROSS PARTS OF NERN MO AS NOCTURNAL LLJ

INTENSIFIES MODESTLY THROUGH THE LATE EVENING. IN ADDITION TO HIGH

WINDS WITH FAST-MOVING BOWING LINE SEGMENTS...A FEW CELLS COULD ALSO

PRODUCE LARGE HAIL.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM

MOTION VECTOR 29035.





...CARBIN

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