

945 

WWUS20 KWNS 302250

SEL5

SPC WW 302250

ILZ000-INZ000-LMZ000-310600-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 255

NWS STORM PREDICTION CENTER NORMAN OK

550 PM CDT THU MAY 30 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  NORTHEASTERN ILLINOIS

  NORTHWESTERN INDIANA

  LAKE MICHIGAN



* EFFECTIVE THIS THURSDAY AFTERNOON AND FRIDAY MORNING FROM 550

  PM UNTIL 100 AM CDT.



* PRIMARY THREATS INCLUDE...

  SEVERAL DAMAGING WIND GUSTS LIKELY WITH A FEW SIGNIFICANT GUSTS

    TO 80 MPH POSSIBLE

  SEVERAL LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE

  A FEW TORNADOES POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 40

STATUTE MILES EAST AND WEST OF A LINE FROM 75 MILES NORTH

NORTHWEST OF VALPARAISO INDIANA TO 40 MILES WEST OF LAFAYETTE

INDIANA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU5).



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 250...WW 251...WW

252...WW 253...WW 254...



DISCUSSION...SEVERE SQUALL LINE NOW ADVANCING EASTWARD ACROSS

NORTHERN ILLINOIS APPEARS LIKELY TO PROGRESS ACROSS MUCH OF THE

CHICAGO METROPOLITAN AREA DURING THE 00-02Z TIME.  THIS WILL BE

ACCOMPANIED BY THE RISK FOR STRONG...POTENTIALLY DAMAGING WIND

GUSTS.  A RELATIVELY SHORT-LIVED TORNADO OR TWO MAY NOT BE

COMPLETELY OUT OF THE QUESTION.



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

TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70

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

MOTION VECTOR 23045.





...KERR

