WHUS73 KMKX 121645

MWWMKX



URGENT - MARINE WEATHER MESSAGE

National Weather Service Milwaukee/Sullivan WI

1045 AM CST Fri Dec 12 2025



LMZ080-261-362-364-366-563-565-567-669-671-673-675-777-779-868-

870-872-874-876-878-130045-

/O.CON.KMKX.UP.W.0005.251213T0600Z-251214T1500Z/

Lake Michigan Michigan City IN to St. Joseph MI 5 NM offshore to

mid-line of lake.-

Lake Michigan from Seul Choix Point to Rock Island Passage 5NM

offshore to Mid Lake-

Lake Michigan South of a line from Seul Choix Point to the

Mackinac Bridge and North of a line from Charlevoix MI to South

Fox Island 5NM offshore-

Lake Michigan from Charlevoix to Point Betsie MI 5NM Offshore to

mid lake-

Lake Michigan from Point Betsie to Manistee MI 5NM offshore to

Mid Lake-

Lake Michigan from Rock Island Passage to Sturgeon Bay WI 5NM

offshore to mid lake-

Lake Michigan from Sturgeon Bay to Two Rivers WI 5NM offshore to

Mid Lake-

Lake Michigan from Two Rivers to Sheboygan WI 5NM offshore to Mid

Lake-

Lake Michigan from Sheboygan to Port Washington WI 5NM offshore

to Mid Lake-

Lake Michigan from Port Washington to North Point Light WI 5NM

offshore to Mid Lake-

Lake Michigan from North Point Light to Wind Point WI 5NM

offshore to Mid Lake-

Lake Michigan from Wind Point WI to Winthrop Harbor IL 5NM

offshore to Mid Lake-

Lake Michigan from Winthrop Harbor to Wilmette Harbor IL 5NM

offshore to Mid Lake-

Lake Michigan from Wilmette Harbor to Michigan City in 5NM

offshore to Mid Lake-

Lake Michigan from Pentwater to Manistee MI 5NM offshore to Mid

Lake-

Lake Michigan from Whitehall to Pentwater MI 5NM offshore to Mid

Lake-

Lake Michigan from Grand Haven to Whitehall MI 5NM offshore to

Mid Lake-

Lake Michigan from Holland to Grand Haven MI 5NM offshore to Mid

Lake-

Lake Michigan from South Haven to Holland MI 5NM offshore to Mid

lake-

Lake Michigan from St Joseph to South Haven MI 5NM offshore to

Mid Lake-

1045 AM CST Fri Dec 12 2025



...HEAVY FREEZING SPRAY WARNING REMAINS IN EFFECT FROM MIDNIGHT

TONIGHT TO 9 AM CST SUNDAY...



* WHAT...Heavy freezing spray at a rate of 2 cm per hour or 

  greater expected, and may rapidly accumulate on vessels.



* WHERE...All Open Waters of Lake Michigan.



* WHEN...From midnight tonight to 9 AM CST Sunday.



* IMPACTS...Operating a vessel in heavy freezing spray is 

  hazardous. Freezing spray may render mechanical and electronic 

  components inoperative. Rapid ice accretion on decks and 

  superstructures may result in a catastrophic loss of stability.



PRECAUTIONARY/PREPAREDNESS ACTIONS...



Mariners should prepare for dangerous accumulation of ice on

their vessel. If possible, remain in port, avoid the warning area

or conduct mitigation.



&&



$$



LMZ643>646-130045-

/O.CON.KMKX.SC.Y.0111.251213T0300Z-251214T1800Z/

Sheboygan to Port Washington WI-

Port Washington to North Point Light WI-

North Point Light to Wind Point WI-

Wind Point WI to Winthrop Harbor IL-

1045 AM CST Fri Dec 12 2025



...SMALL CRAFT ADVISORY REMAINS IN EFFECT FROM 9 PM THIS EVENING

TO NOON CST SUNDAY...



* WHAT...Northwest winds 15 to 25 kt with gusts up to 30 kt 

  expected.



* WHERE...Nearshore Waters from Sheboygan to Winthrop Harbor IL.



* WHEN...From 9 PM this evening to noon CST Sunday.



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



PRECAUTIONARY/PREPAREDNESS ACTIONS...



Inexperienced mariners, especially those operating smaller

vessels, should avoid navigating in hazardous conditions.



&&



$$