WHUS73 KLOT 110339

MWWLOT



URGENT - MARINE WEATHER MESSAGE

National Weather Service Chicago IL

939 PM CST Wed Dec 10 2025



LMZ740>743-111000-

/O.CON.KLOT.SC.Y.0111.000000T0000Z-251211T1000Z/

Winthrop Harbor to Wilmette Harbor IL-

Wilmette Harbor to Northerly Island IL-

Northerly Island to Calumet Harbor IL-

Calumet Harbor IL to Gary IN-

939 PM CST Wed Dec 10 2025



...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 4 AM CST

THURSDAY...



* WHAT...Significant waves to 8 ft occasionally to 10 ft 

  occurring.



* WHERE...Winthrop Harbor to Calumet Harbor IL, and Calumet 

  Harbor IL to Gary IN.



* WHEN...Until 4 AM CST Thursday.



* IMPACTS...Conditions will be hazardous to small craft.



* ADDITIONAL DETAILS...The largest waves are occurring near the

  outer edges of the nearshore zones.  



PRECAUTIONARY/PREPAREDNESS ACTIONS...



Inexperienced mariners, especially those operating smaller

vessels, should avoid navigating in hazardous conditions.



&&



$$



LMZ744-745-111145-

/O.CON.KLOT.SC.Y.0111.000000T0000Z-251211T1800Z/

Gary to Burns Harbor IN-Burns Harbor to Michigan City IN-

939 PM CST Wed Dec 10 2025



...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL NOON CST

THURSDAY...



* WHAT...Significant waves to 11 ft occasionally to 14 ft

  occurring. 



* WHERE...Gary to Michigan City IN.



* WHEN...Until noon CST Thursday.



* IMPACTS...Conditions will be hazardous to small craft.



PRECAUTIONARY/PREPAREDNESS ACTIONS...



Inexperienced mariners, especially those operating smaller

vessels, should avoid navigating in hazardous conditions.



&&



$$