Marine Weather Message
Issued by NWS Chicago, IL
Issued by NWS Chicago, IL
466 WHUS73 KLOT 200809 MWWLOT URGENT - MARINE WEATHER MESSAGE National Weather Service Chicago IL 309 AM CDT Sun Sep 20 2026 LMZ740>742-201615- /O.CON.KLOT.MF.Y.0014.000000T0000Z-260920T1400Z/ /O.CON.KLOT.SC.Y.0083.260920T1200Z-260923T0000Z/ Winthrop Harbor to Wilmette Harbor IL- Wilmette Harbor to Northerly Island IL- Northerly Island to Calumet Harbor IL- 309 AM CDT Sun Sep 20 2026 ...DENSE FOG ADVISORY REMAINS IN EFFECT UNTIL 9 AM CDT THIS MORNING... ...SMALL CRAFT ADVISORY REMAINS IN EFFECT FROM 7 AM THIS MORNING TO 7 PM CDT TUESDAY... * WHAT...For the Dense Fog Advisory, dense fog will reduce visibility to one quarter mile or less. For the Small Craft Advisory, northeast winds to 30 kt and significant waves to 10 ft occasionally to 13 ft expected. * WHERE...Winthrop Harbor to Calumet Harbor IL. * WHEN...For the Dense Fog Advisory, until 9 AM CDT this morning. For the Small Craft Advisory, from 7 AM this morning to 7 PM CDT Tuesday. * IMPACTS...Conditions will be hazardous to small craft. Low visibility will make navigation difficult. PRECAUTIONARY/PREPAREDNESS ACTIONS... Inexperienced mariners, especially those operating smaller vessels, should avoid navigating in hazardous conditions. If you must navigate, proceed with caution. Use proper fog signals. Make sure all running lights are on. Remember to use your radar and compass. && $$ LMZ743-744-201615- /O.CON.KLOT.MF.Y.0014.000000T0000Z-260920T1400Z/ /O.CON.KLOT.SC.Y.0083.260920T1500Z-260923T0000Z/ Calumet Harbor IL to Gary IN-Gary to Burns Harbor IN- 309 AM CDT Sun Sep 20 2026 ...DENSE FOG ADVISORY REMAINS IN EFFECT UNTIL 9 AM CDT THIS MORNING... ...SMALL CRAFT ADVISORY REMAINS IN EFFECT FROM 10 AM THIS MORNING TO 7 PM CDT TUESDAY... * WHAT...For the Dense Fog Advisory, dense fog will reduce visibility to one quarter mile or less. For the Small Craft Advisory, northeast winds to 30 kt and significant waves to 8 ft occasionally to 10 ft expected. * WHERE...Calumet Harbor IL to Burns Harbor IN. * WHEN...For the Dense Fog Advisory, until 9 AM CDT this morning. For the Small Craft Advisory, from 10 AM this morning to 7 PM CDT Tuesday. * IMPACTS...Conditions will be hazardous to small craft. Low visibility will make navigation difficult. PRECAUTIONARY/PREPAREDNESS ACTIONS... Inexperienced mariners, especially those operating smaller vessels, should avoid navigating in hazardous conditions. If you must navigate, proceed with caution. Use proper fog signals. Make sure all running lights are on. Remember to use your radar and compass. && $$ LMZ745-201615- /O.CON.KLOT.MF.Y.0014.000000T0000Z-260920T1400Z/ /O.CON.KLOT.SC.Y.0083.260920T1800Z-260921T1200Z/ Burns Harbor to Michigan City IN- 309 AM CDT Sun Sep 20 2026 ...DENSE FOG ADVISORY REMAINS IN EFFECT UNTIL 9 AM CDT THIS MORNING... ...SMALL CRAFT ADVISORY REMAINS IN EFFECT FROM 1 PM THIS AFTERNOON TO 7 AM CDT MONDAY... * WHAT...For the Dense Fog Advisory, dense fog will reduce visibility to one quarter mile or less. For the Small Craft Advisory, northeast winds to 25 kt and significant waves to 7 ft occasionally to 9 ft expected. * WHERE...Burns Harbor to Michigan City IN. * WHEN...For the Dense Fog Advisory, until 9 AM CDT this morning. For the Small Craft Advisory, from 1 PM this afternoon to 7 AM CDT Monday. * IMPACTS...Conditions will be hazardous to small craft. Low visibility will make navigation difficult. PRECAUTIONARY/PREPAREDNESS ACTIONS... Inexperienced mariners, especially those operating smaller vessels, should avoid navigating in hazardous conditions. If you must navigate, proceed with caution. Use proper fog signals. Make sure all running lights are on. Remember to use your radar and compass. && $$