WHUS73 KLOT 211950

MWWLOT



URGENT - MARINE WEATHER MESSAGE

National Weather Service Chicago IL

250 PM CDT Sat Mar 21 2026



LMZ740>742-220400-

/O.CON.KLOT.SC.Y.0032.260322T1200Z-260323T1800Z/

Winthrop Harbor to Wilmette Harbor IL-

Wilmette Harbor to Northerly Island IL-

Northerly Island to Calumet Harbor IL-

250 PM CDT Sat Mar 21 2026



...SMALL CRAFT ADVISORY REMAINS IN EFFECT FROM 7 AM SUNDAY TO

1 PM CDT MONDAY...



* WHAT...North winds to 30 kt with a few gale force gusts to 35 kt

  and significant waves to 10 ft occasionally to 13 ft expected.



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



* WHEN...From 7 AM Sunday to 1 PM CDT Monday.



* 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>745-220400-

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

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

Burns Harbor to Michigan City IN-

250 PM CDT Sat Mar 21 2026



...SMALL CRAFT ADVISORY REMAINS IN EFFECT FROM 10 AM SUNDAY TO

4 PM CDT MONDAY...



* WHAT...North winds to 30 kt with a few gale force gusts to 35 

  kt and significant waves to 12 ft occasionally to 16 ft 

  expected.



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



* WHEN...From 10 AM Sunday to 4 PM CDT Monday.



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



PRECAUTIONARY/PREPAREDNESS ACTIONS...



Inexperienced mariners, especially those operating smaller

vessels, should avoid navigating in hazardous conditions.



&&



$$