Dense Fog Advisory
URGENT - MARINE WEATHER MESSAGE
National Weather Service Marquette MI
513 AM EDT Mon May 18 2026
LSZ267-182115-
/O.NEW.KMQT.MF.Y.0011.260518T0913Z-260519T0000Z/
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
513 AM EDT Mon May 18 2026
...DENSE FOG ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING...
* WHAT...Dense fog will reduce visibility to less than one
nautical mile.
* WHERE...Lake Superior from Grand Marais MI to Whitefish Point
MI 5NM off shore to the US/Canadian border.
* WHEN...Until 8 PM EDT this evening.
* IMPACTS...Low visibility will make navigation difficult.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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.
&&
$$
URGENT - MARINE WEATHER MESSAGE
National Weather Service Marquette MI
513 AM EDT Mon May 18 2026
LMZ221-181500-
/O.CAN.KMQT.SC.Y.0085.000000T0000Z-260519T0000Z/
/O.NEW.KMQT.MF.Y.0011.260518T0913Z-260518T1500Z/
Green Bay North of line from Cedar River MI to Rock Island
Passage-
513 AM EDT Mon May 18 2026
...DENSE FOG ADVISORY IN EFFECT UNTIL 11 AM EDT THIS MORNING...
...SMALL CRAFT ADVISORY IS CANCELLED...
* WHAT...Dense fog will reduce visibility to less than one
nautical mile.
* WHERE...Green Bay North of line from Cedar River MI to Rock
Island Passage.
* WHEN...Until 11 AM EDT this morning.
* IMPACTS...Low visibility will make navigation difficult.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If you must navigate, proceed with caution. Use proper fog
signals. Make sure all running lights are on. Remember to use
your radar and compass.
&&
$$
URGENT - MARINE WEATHER MESSAGE
National Weather Service Marquette MI
513 AM EDT Mon May 18 2026
LMZ248-250-182115-
/O.NEW.KMQT.MF.Y.0011.260518T0913Z-260518T1500Z/
/O.EXT.KMQT.SC.Y.0085.000000T0000Z-260520T0000Z/
Seul Choix Point to Point Detour MI-
5NM East of a line from Fairport MI to Rock Island Passage-
513 AM EDT Mon May 18 2026
...DENSE FOG ADVISORY IN EFFECT UNTIL 11 AM EDT THIS MORNING...
...SMALL CRAFT ADVISORY NOW IN EFFECT UNTIL 8 PM EDT TUESDAY...
* WHAT...For the Dense Fog Advisory, dense fog will reduce
visibility to less than one nautical mile. For the Small Craft
Advisory, south winds 15 to 25 kt with gusts up to 30 kt and
waves 5 to 8 ft occurring.
* WHERE...Seul Choix Point to Point Detour MI and 5NM East of a
line from Fairport MI to Rock Island Passage.
* WHEN...For the Dense Fog Advisory, until 11 AM EDT this
morning. For the Small Craft Advisory, until 8 PM EDT 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.
&&
$$
URGENT - MARINE WEATHER MESSAGE
National Weather Service Marquette MI
513 AM EDT Mon May 18 2026
LSZ264>266-182100-
/O.NEW.KMQT.MF.Y.0011.260518T0913Z-260518T2100Z/
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
Lake Superior East of a line from Manitou Island to Marquette MI
and West of a line from Grand Marais MI to the US/Canadian Border
Beyond 5NM from shore-
513 AM EDT Mon May 18 2026
...DENSE FOG ADVISORY IN EFFECT UNTIL 5 PM EDT THIS AFTERNOON...
* WHAT...Dense fog will reduce visibility to less than one
nautical mile.
* WHERE...Lake Superior from Upper Entrance to Portage Canal to
Manitou Island MI 5NM off shore to the US/Canadian Border,
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore and Lake Superior East of a line from
Manitou Island to Marquette MI and West of a line from Grand
Marais MI to the US/Canadian Border Beyond 5NM from shore.
* WHEN...Until 5 PM EDT this afternoon.
* IMPACTS...Low visibility will make navigation difficult.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If you must navigate, proceed with caution. Use proper fog
signals. Make sure all running lights are on. Remember to use
your radar and compass.
&&
$$
URGENT - MARINE WEATHER MESSAGE
National Weather Service Green Bay WI
345 AM CDT Mon May 18 2026
LMZ521-522-181645-
/O.CAN.KGRB.SC.Y.0052.000000T0000Z-260519T0000Z/
/O.CON.KGRB.MF.Y.0006.000000T0000Z-260518T1400Z/
/O.NEW.KGRB.SC.Y.0053.260519T1500Z-260520T0000Z/
Green Bay south of line from Cedar River to Rock Island Passage
and north of a line from Oconto WI to Little Sturgeon Bay WI-
Green Bay south of line from Oconto WI to Little Sturgeon Bay WI-
345 AM CDT Mon May 18 2026
...DENSE FOG ADVISORY REMAINS IN EFFECT UNTIL 9 AM CDT THIS
MORNING...
...SMALL CRAFT ADVISORY IN EFFECT FROM 10 AM TO 7 PM CDT
TUESDAY...
* WHAT...For the Dense Fog Advisory, dense fog will reduce
visibility to less than 1 NM. For the Small Craft Advisory, west
winds 15 to 20 kts with gusts up to 25 kts and waves 2 to 4 ft
expected.
* WHERE...Central and Southern Bay of Green Bay.
* WHEN...For the Dense Fog Advisory, until 9 AM CDT this
morning. For the Small Craft Advisory, from 10 AM 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.
&&
$$
URGENT - MARINE WEATHER MESSAGE
National Weather Service Green Bay WI
345 AM CDT Mon May 18 2026
LMZ541-542-181645-
/O.CON.KGRB.MF.Y.0006.000000T0000Z-260518T1400Z/
/O.CON.KGRB.SC.Y.0052.000000T0000Z-260520T0600Z/
Rock Island Passage to Sturgeon Bay WI-
Sturgeon Bay to Two Rivers WI-
345 AM CDT Mon May 18 2026
...DENSE FOG ADVISORY REMAINS IN EFFECT UNTIL 9 AM CDT THIS
MORNING...
...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 1 AM CDT
WEDNESDAY...
* WHAT...For the Dense Fog Advisory, dense fog will reduce
visibility to 1 NM or less. For the Small Craft Advisory, south
winds 10 to 20 kts with gusts to 25 kts veering west on Tuesday.
Waves 3 to 5 ft increasing to 4 to 7 ft late tonight into
Tuesday.
* WHERE...Lake Michigan nearshore waters from Washington Island
to Two Rivers.
* WHEN...For the Dense Fog Advisory, until 9 AM CDT this
morning. For the Small Craft Advisory, until 1 AM CDT
Wednesday.
* IMPACTS...Conditions will be hazardous to small craft. Low
visibility will make navigation difficult.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Inexperienced mariners, especially those operating smaller
vessels, should avoid navigating in hazardous conditions.
If you must navigate, proceed with caution. Use proper fog
signals. Make sure all running lights are on. Remember to use
your radar and compass.
&&
$$
Kieckbusch
