WHUS73 KLOT 221218

MWWLOT



URGENT - MARINE WEATHER MESSAGE

National Weather Service Chicago IL

718 AM CDT Sun Mar 22 2026



LMZ740>742-230000-

/O.UPG.KLOT.SC.Y.0032.000000T0000Z-260323T1800Z/

/O.NEW.KLOT.GL.W.0015.260322T1218Z-260323T0300Z/

Winthrop Harbor to Wilmette Harbor IL-

Wilmette Harbor to Northerly Island IL-

Northerly Island to Calumet Harbor IL-

718 AM CDT Sun Mar 22 2026



...GALE WARNING IN EFFECT UNTIL 10 PM CDT THIS EVENING...



* WHAT...North gales to 35 kt and significant waves to 11 ft 

  occasionally to 14 ft.



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



* WHEN...Until 10 PM CDT this evening.



* IMPACTS...Strong winds will cause hazardous waves which could 

  capsize or damage vessels and reduce visibility.



PRECAUTIONARY/PREPAREDNESS ACTIONS...



Mariners should alter plans to avoid these hazardous conditions.

Remain in port, seek safe harbor, alter course, and/or secure the

vessel for hazardous conditions.



&&



$$



LMZ743>745-230000-

/O.UPG.KLOT.SC.Y.0032.260322T1500Z-260323T2100Z/

/O.NEW.KLOT.GL.W.0015.260322T1600Z-260323T0300Z/

Calumet Harbor IL to Gary IN-Gary to Burns Harbor IN-

Burns Harbor to Michigan City IN-

718 AM CDT Sun Mar 22 2026



...GALE WARNING IN EFFECT FROM 11 AM THIS MORNING TO 10 PM CDT

THIS EVENING...



* WHAT...North gales to 35 kt and significant waves to 12 ft 

  occasionally to 16 ft expected.



* WHERE...Calumet Harbor IL to Michigan City IN.



* WHEN...From 11 AM this morning to 10 PM CDT this evening.



* IMPACTS...Strong winds will cause hazardous waves which could

  capsize or damage vessels and reduce visibility.



PRECAUTIONARY/PREPAREDNESS ACTIONS...



Mariners should alter plans to avoid these hazardous conditions.

Remain in port, seek safe harbor, alter course, and/or secure the

vessel for hazardous conditions.



&&



$$