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WWUS20 KWNS 242321

SEL8

SPC WW 242321

ILZ000-INZ000-MIZ000-OHZ000-LMZ000-250400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 358

NWS STORM PREDICTION CENTER NORMAN OK

715 PM EDT MON JUN 24 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  EAST CENTRAL ILLINOIS

  NORTHERN AND CENTRAL INDIANA

  SOUTHERN LOWER MICHIGAN

  NORTHWEST OHIO

  LAKE MICHIGAN



* EFFECTIVE THIS MONDAY NIGHT FROM 715 PM UNTIL MIDNIGHT EDT.



* PRIMARY THREATS INCLUDE...

  NUMEROUS DAMAGING WIND GUSTS LIKELY WITH A FEW SIGNIFICANT GUSTS

    TO 75 MPH POSSIBLE

  A FEW LARGE HAIL EVENTS TO 1 INCH IN DIAMETER POSSIBLE

  A FEW TORNADOES POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 75

STATUTE MILES EAST AND WEST OF A LINE FROM 25 MILES NORTHWEST OF

LANSING MICHIGAN TO 35 MILES SOUTH SOUTHEAST OF DANVILLE

ILLINOIS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).



PRECAUTIONARY/PREPAREDNESS ACTIONS...



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 354...WW 355...WW

356...WW 357...



DISCUSSION...NRN IL SQLN EXPECTED TO CONTINUE E AT AOA 45-50

KTS...GIVEN ASSOCIATED WIND PROFILES SAMPLED AT DVN AND LOT

DEPICTING DEEP/STRONG REAR-INFLOW JET. PRESENCE OF WEAK W-E FRONT

OVER THE GRR-LAN AREA...AND THE NWD ADVANCE OF WEAKER LOW-LVL LAPSE

RATE PLUME ACROSS CNTRL IND EXPECTED TO SERVE AS RESPECTIVE

NORTH/SOUTH DELIMITERS OF SVR THREAT. BACKGROUND SHEAR ENVIRONMENT

SAMPLED BY IWX VWP SUGGESTS POTENTIAL FOR A TORNADO OR TWO...BOTH

ALONG THE SQLN...AND WITH ANY SUSTAINED...DISCRETE STORMS FORMING

ALONG LAKE BREEZE BOUNDARY AHEAD OF SQLN IN NW IND.



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

TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 65 KNOTS.

A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM MOTION

VECTOR 27045.





...CORFIDI

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