250  
WHUS73 KLOT 211455  
MWWLOT  
 
URGENT - MARINE WEATHER MESSAGE  
NATIONAL WEATHER SERVICE CHICAGO IL  
955 AM CDT THU OCT 21 2021  
 
LMZ740>742-212300-  
/O.CON.KLOT.SC.Y.0082.000000T0000Z-211022T0900Z/  
WINTHROP HARBOR TO WILMETTE HARBOR IL-  
WILMETTE HARBOR TO NORTHERLY ISLAND IL-  
NORTHERLY ISLAND TO CALUMET HARBOR IL-  
955 AM CDT THU OCT 21 2021  
   
..SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 4 AM CDT FRIDAY
 
 
* WHAT...WEST WINDS TO 25 KT BECOMING NORTHWEST TO NORTH INTO THIS  
EVENING, SIGNIFICANT WAVES UP TO 9 FT, AND OCCASIONAL WAVES UP  
TO 12 FT.  
 
* WHERE...WINTHROP HARBOR TO CALUMET HARBOR IL.  
 
* WHEN...FROM 4 AM THURSDAY TO 4 AM CDT FRIDAY.  
 
* IMPACTS...CONDITIONS WILL BE HAZARDOUS TO SMALL CRAFT.  
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...  
 
INEXPERIENCED MARINERS, ESPECIALLY THOSE OPERATING SMALLER  
VESSELS, SHOULD AVOID NAVIGATING IN HAZARDOUS CONDITIONS.  
 

 
 

 
 
LMZ743>745-212300-  
/O.CON.KLOT.SC.Y.0082.000000T0000Z-211022T1500Z/  
CALUMET HARBOR IL TO GARY IN-GARY TO BURNS HARBOR IN-  
BURNS HARBOR TO MICHIGAN CITY IN-  
955 AM CDT THU OCT 21 2021  
 
...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 10 AM CDT  
FRIDAY...  
 
* WHAT...WEST WINDS TO 25 KT BECOMING NORTHWEST TO NORTH INTO THIS  
EVENING WITH GUSTS UP TO 30 KT, SIGNIFICANT WAVES UP TO 11 FT,  
AND OCCASIONAL WAVES UP TO 14 FT.  
 
* WHERE...CALUMET HARBOR IL TO MICHIGAN CITY IN.  
 
* WHEN...UNTIL 10 AM CDT FRIDAY.  
 
* IMPACTS...CONDITIONS WILL BE HAZARDOUS TO SMALL CRAFT.  
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...  
 
INEXPERIENCED MARINERS, ESPECIALLY THOSE OPERATING SMALLER  
VESSELS, SHOULD AVOID NAVIGATING IN HAZARDOUS CONDITIONS.  
 

 
 

 
 
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