617  
FLUS43 KLOT 182053  
HWOLOT  
 
HAZARDOUS WEATHER OUTLOOK  
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL  
353 PM CDT THU JUL 18 2019  
 
ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019-  
192100-  
WINNEBAGO-BOONE-MCHENRY-LAKE-OGLE-LEE-DE KALB-KANE-DUPAGE-COOK-  
LA SALLE-KENDALL-GRUNDY-WILL-KANKAKEE-LIVINGSTON-IROQUOIS-FORD-  
PORTER-NEWTON-JASPER-BENTON-  
353 PM CDT THU JUL 18 2019 /453 PM EDT THU JUL 18 2019/  
 
THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTH CENTRAL  
ILLINOIS...NORTHEAST ILLINOIS AND NORTHWEST INDIANA.  
   
DAY ONE
 
TONIGHT.  
 
WEATHER HAZARDS EXPECTED...  
 
LIMITED THUNDERSTORM RISK...WITH AN ASSOCIATED:  
LIMITED DAMAGING WIND RISK...UP TO 50 MPH.  
LIMITED FLOODING RISK.  
SIGNIFICANT EXCESSIVE HEAT RISK.  
 
DISCUSSION...  
 
ANOTHER ROUND OF THUNDERSTORMS IS LIKELY TO DEVELOP TO OUR  
NORTHWEST THIS EVENING. THERE IS A SMALL CHANCE THAT SOME OF  
THESE STORMS COULD SHIFT INTO FAR NORTHERN ILLINOIS, NORTH OF  
I-88, OVERNIGHT. IF THESE STORMS DO MAKE IT INTO THIS AREA  
OVERNIGHT, THERE IS A SMALL THREAT FOR GUSTY WINDS AND HEAVY  
RAINFALL.  
 
A VERY WARM AND HUMID NIGHT IS EXPECTED, WITH LOWS ONLY IN THE  
UPPER 70S.  
   
DAYS TWO THROUGH SEVEN
 
FRIDAY THROUGH WEDNESDAY.  
 
FRIDAY...  
LIMITED THUNDERSTORM RISK AT NIGHT.  
SIGNIFICANT EXCESSIVE HEAT RISK.  
SATURDAY...  
LIMITED PM SEVERE THUNDERSTORM RISK.  
ELEVATED PM FLOODING RISK.  
EXTREME EXCESSIVE HEAT RISK.  
SUNDAY...  
LIMITED THUNDERSTORM RISK.  
LIMITED FLOODING RISK.  
LIMITED EXCESSIVE HEAT RISK.  
 
DISCUSSION:  
 
HEAT WILL BUILD TO DANGEROUS LEVELS FOR THE ENTIRE AREA FRIDAY  
THROUGH SATURDAY. HEAT INDICES WILL CLIMB IN EXCESS OF 105  
DEGREES FOR MUCH OF THE AREA. VERY WARM OVERNIGHT TEMPERATURES  
WILL OFFER LITTLE RELIEF FROM THE HEAT AND HUMIDITY, ESPECIALLY IN  
THE URBAN HEAT ISLAND OF CHICAGO.  
 
STRONG THUNDERSTORMS AND HEAVY RAINFALL IS POSSIBLE OVER THE AREA  
LATE SATURDAY INTO SUNDAY MORNING. THIS HEAVY RAIN COULD RESULT IN  
A FLASH FLOOD RISK FOR PORTIONS OF THE AREA.  
   
SPOTTER INFORMATION STATEMENT
 
 
SPOTTERS WILL LIKELY BE NEEDED TONIGHT.  
 
GENERAL STORM MOTION OF THE DAY:  
 
MOVING TOWARD THE EAST AT 20 TO 30 MPH.  
 

 
 
LMZ740>745-192100-  
WINTHROP HARBOR TO WILMETTE HARBOR IL-  
WILMETTE HARBOR TO NORTHERLY ISLAND IL-  
NORTHERLY ISLAND TO CALUMET HARBOR IL-  
CALUMET HARBOR IL TO GARY IN-GARY TO BURNS HARBOR IN-  
BURNS HARBOR TO MICHIGAN CITY IN-  
353 PM CDT THU JUL 18 2019  
 
THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF THE ILLINOIS  
NEARSHORE WATERS OF LAKE MICHIGAN AND THE INDIANA NEARSHORE  
WATERS OF LAKE MICHIGAN.  
   
DAY ONE
 
TONIGHT.  
 
WEATHER HAZARDS EXPECTED...  
 
LIMITED THUNDERSTORM RISK...WITH AN ASSOCIATED:  
LIMITED THUNDERSTORM WIND GUST RISK...UP TO 40 KNOTS.  
   
DAYS TWO THROUGH SEVEN
 
FRIDAY THROUGH WEDNESDAY.  
 
FRIDAY...  
LIMITED THUNDERSTORM RISK.  
SATURDAY...  
LIMITED SEVERE THUNDERSTORM RISK.  
SUNDAY...  
LIMITED THUNDERSTORM RISK.  
 

 
 
KJB  
 
VISIT US AT HTTP://WEATHER.GOV/CHICAGO  
 
FOLLOW US ON FACEBOOK, TWITTER, AND YOUTUBE AT:  
WWW.FACEBOOK.COM/NWSCHICAGO  
WWW.TWITTER.COM/NWSCHICAGO  
WWW.YOUTUBE.COM/NWSCHICAGO  
 
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