091  
FLUS43 KLOT 230917  
HWOLOT  
 
HAZARDOUS WEATHER OUTLOOK  
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL  
417 AM CDT SAT OCT 23 2021  
 
ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-  
010-011-019-240930-  
WINNEBAGO-BOONE-MCHENRY-LAKE IL-OGLE-LEE-DE KALB-KANE-DUPAGE-  
LA SALLE-KENDALL-GRUNDY-KANKAKEE-LIVINGSTON-IROQUOIS-FORD-  
NORTHERN COOK-CENTRAL COOK-SOUTHERN COOK-NORTHERN WILL-  
SOUTHERN WILL-EASTERN WILL-LAKE IN-PORTER-NEWTON-JASPER-BENTON-  
417 AM CDT SAT OCT 23 2021 /517 AM EDT SAT OCT 23 2021/  
 
THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTH CENTRAL  
ILLINOIS...NORTHEAST ILLINOIS AND NORTHWEST INDIANA.  
   
DAY ONE
 
TODAY AND TONIGHT.  
 
WEATHER HAZARDS EXPECTED...  
 
ELEVATED FROST AND FREEZE RISK THIS MORNING.  
LIMITED FROST RISK FOR INTERIOR NW ILLINOIS TONIGHT.  
 
DISCUSSION...  
 
THE THREAT FOR FROST AND NEAR-FREEZING TEMPERATURES WILL CONTINUE  
NEAR AND NORTHWEST OF THE I-55 CORRIDOR OUTSIDE OF CHICAGO THIS  
MORNING. ELSEWHERE, PATCHY FROST IS POSSIBLE AWAY FROM THE  
LAKEFRONT.  
 
ADDITIONAL PATCHY FROST DEVELOPMENT IS POSSIBLE LATE TONIGHT.  
   
DAYS TWO THROUGH SEVEN
 
SUNDAY THROUGH FRIDAY.  
 
SUNDAY...  
LIMITED FLOODING RISK.  
LIMITED NON THUNDERSTORM WIND RISK.  
ELEVATED LAKESHORE FLOOD RISK.  
MONDAY...  
LIMITED THUNDERSTORM RISK.  
LIMITED NON THUNDERSTORM WIND RISK.  
ELEVATED LAKESHORE FLOOD RISK.  
TUESDAY MORNING...  
LIMITED FROST AND OR FREEZE RISK.  
 
DISCUSSION:  
 
WIDESPREAD, SOAKING RAIN AND STRONG EASTERLY WINDS ARE BECOMING  
INCREASINGLY LIKELY SUNDAY AND MONDAY. WINDS COULD GUST AS HIGH AS  
40-45 MPH NEAR THE IMMEDIATE LAKESHORE SUNDAY EVENING INTO MONDAY.  
RISES IN RIVER AND STREAM LEVELS, SOME POSSIBLY SIGNIFICANT,  
WILL OCCUR. FLOODING MAY OCCUR ON ROADWAYS NEAR LEAF-CLOGGED  
SEWER DRAINS. ADDITIONALLY, FLOODING OF PARKS AND TRAILS  
IMMEDIATELY ALONG THE LAKE MICHIGAN SHORE MAY OCCUR, PARTICULARLY  
IN ILLINOIS, INCLUDING THE CHICAGO BIKE PATH. FINALLY, A FEW  
STRONG THUNDERSTORMS MAY OCCUR SOUTH OF US-24 SUNDAY EVENING.  
   
SPOTTER INFORMATION STATEMENT
 
 
SPOTTER ACTIVATION WILL NOT BE NECESSARY THROUGH TONIGHT.  
 

 
 
LMZ740>745-240930-  
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-  
417 AM CDT SAT OCT 23 2021  
 
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
 
TODAY AND TONIGHT.  
 
NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.  
   
DAYS TWO THROUGH SEVEN
 
SUNDAY THROUGH FRIDAY.  
 
SUNDAY AND MONDAY...  
GALE FORCE WINDS AND VERY HAZARDOUS WAVES ARE LIKELY.  
LIMITED THUNDERSTORM RISK.  
TUESDAY...  
HAZARDOUS CONDITIONS FOR SMALL CRAFT ARE LIKELY.  
 

 
 
DOOM  
 
VISIT US AT WWW.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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