Small Craft Advisory
URGENT - MARINE WEATHER MESSAGE
National Weather Service Grand Rapids MI
313 AM EDT Tue Aug 18 2026
LMZ846>849-181515-
/O.NEW.KGRR.SC.Y.0058.260818T2100Z-260819T0300Z/
Holland to Grand Haven MI-Grand Haven to Whitehall MI-
Whitehall to Pentwater MI-Pentwater to Manistee MI-
313 AM EDT Tue Aug 18 2026
...SMALL CRAFT ADVISORY IN EFFECT FROM 5 PM THIS AFTERNOON TO
11 PM EDT THIS EVENING...
* WHAT...Southwest winds 10 to 15 knots with gusts up to 25
knots and waves 3 to 5 feet expected.
* WHERE...Holland to Manistee.
* WHEN...From 5 PM this afternoon to 11 PM EDT this evening.
* IMPACTS...Conditions will be hazardous to small craft.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Inexperienced mariners, especially those operating smaller
vessels, should avoid navigating in hazardous conditions.
&&
$$
Hazardous Weather Outlook
Hazardous Weather Outlook
National Weather Service Milwaukee/Sullivan WI
505 AM CDT Tue Aug 18 2026
LMZ080-261-362-364-366-563-565-567-669-671-673-675-777-779-868-
870-872-874-876-878-191015-
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-
505 AM CDT Tue Aug 18 2026
This Hazardous Weather Outlook is for the open waters of Lake Michigan.
.DAY ONE...Today and Tonight
Chance of thunderstorms today and tonight, mainly in the
afternoon and evening.
.DAYS TWO THROUGH SEVEN...Wednesday through Monday
Chance of thunderstorms on Friday.
$$
www.weather.gov/mkx
Hazardous Weather Outlook
National Weather Service Milwaukee/Sullivan WI
505 AM CDT Tue Aug 18 2026
LMZ643>646-191015-
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-
505 AM CDT Tue Aug 18 2026
This Hazardous Weather Outlook is for the nearshore waters from
Sheboygan Wisconsin to Winthrop Harbor Illinois.
.DAY ONE...Today and Tonight
Chance of thunderstorms, mainly in the afternoon and evening.
.DAYS TWO THROUGH SEVEN...Wednesday through Monday
Chance of thunderstorms on Friday.
$$
Hazardous Weather Outlook
National Weather Service Milwaukee/Sullivan WI
505 AM CDT Tue Aug 18 2026
WIZ046-047-051-052-056>060-062>072-191015-
Marquette-Green Lake-Fond du Lac-Sheboygan-Sauk-Columbia-Dodge-
Washington-Ozaukee-Iowa-Dane-Jefferson-Waukesha-Milwaukee-
Lafayette-Green-Rock-Walworth-Racine-Kenosha-
505 AM CDT Tue Aug 18 2026
This Hazardous Weather Outlook is for portions of east central
Wisconsin, south central Wisconsin and southeast Wisconsin.
.DAY ONE...Today and Tonight
Thunderstorms possible today through this evening. Cannot rule out
a few stronger storms capable of producing gusty winds and heavy
rainfall later this afternoon/evening.
.DAYS TWO THROUGH SEVEN...Wednesday through Monday
Chance of thunderstorms Friday.
.SPOTTER INFORMATION STATEMENT...
Spotter activation may be needed this afternoon and evening.
$$
Hazardous Weather Outlook
National Weather Service La Crosse WI
436 AM CDT Tue Aug 18 2026
IAZ008>011-018-019-029-030-MNZ079-086>088-094>096-WIZ017-029-
032>034-041>044-053>055-061-191345-
Mitchell-Howard-Winneshiek-Allamakee-Floyd-Chickasaw-Fayette-
Clayton-Wabasha-Dodge-Olmsted-Winona-Mower-Fillmore-Houston-
Taylor-Clark-Buffalo-Trempealeau-Jackson-La Crosse-Monroe-Juneau-
Adams-Vernon-Crawford-Richland-Grant-
436 AM CDT Tue Aug 18 2026
This Hazardous Weather Outlook is for portions of southeast
Minnesota...central Wisconsin...north central Wisconsin and west
central Wisconsin.
.DAY ONE...Today and Tonight
Isolated strong storms will be possible this afternoon and evening
with gusty winds being the primary threat.
.DAYS TWO THROUGH SEVEN...Wednesday through Monday
The probability for widespread hazardous weather is low.
.SPOTTER INFORMATION STATEMENT...
No action needed.
.EMERGENCY MANAGEMENT COORDINATION...
No webinar is scheduled.
$$
Hazardous Weather Outlook
National Weather Service Twin Cities/Chanhassen MN
305 AM CDT Tue Aug 18 2026
MNZ041>045-047>070-073>078-082>085-091>093-WIZ014>016-023>028-
190815-
Douglas-Todd-Morrison-Mille Lacs-Kanabec-Stevens-Pope-Stearns-
Benton-Sherburne-Isanti-Chisago-Lac Qui Parle-Swift-Chippewa-
Kandiyohi-Meeker-Wright-Hennepin-Anoka-Ramsey-Washington-
Yellow Medicine-Renville-McLeod-Sibley-Carver-Scott-Dakota-
Redwood-Brown-Nicollet-Le Sueur-Rice-Goodhue-Watonwan-Blue Earth-
Waseca-Steele-Martin-Faribault-Freeborn-Polk-Barron-Rusk-
St. Croix-Pierce-Dunn-Pepin-Eau Claire-
305 AM CDT Tue Aug 18 2026
This Hazardous Weather Outlook is for portions of central and
southern Minnesota, and west central Wisconsin.
.DAY ONE...Today and Tonight.
A few storms are expected this morning and throughout the day,
with severe weather not expected.
.DAYS TWO THROUGH SEVEN...Wednesday through Monday.
Another round of showers and storms arrives Thursday and lasts
into Friday. A few strong storms are possible.
.SPOTTER INFORMATION STATEMENT...
SKYWARN spotter activation may be needed this morning, but is not
expected..
$$
Hazardous Weather Outlook
National Weather Service Green Bay WI
220 AM CDT Tue Aug 18 2026
LMZ521-522-541>543-190730-
The Bay of Green Bay south of a line from Cedar River MI to Rock
Island Passage-Lake Michigan from Washington Island to Sheboygan-
220 AM CDT Tue Aug 18 2026
This Hazardous Weather Outlook is for portions of northwest Lake
Michigan and the waters of Green Bay.
.DAY ONE...Today and Tonight
There is a chance of thunderstorms this afternoon. Any thunderstorm
could pose a hazard to mariners.
.DAYS TWO THROUGH SEVEN...Wednesday through Monday
There is a chance of thunderstorms late Thursday into Friday.
$$
Bersch
Hazardous Weather Outlook
National Weather Service Green Bay WI
220 AM CDT Tue Aug 18 2026
WIZ005-010>013-018>022-030-031-035>040-045-048>050-073-074-190730-
Vilas-Oneida-Forest-Florence-Northern Marinette County-Lincoln-
Langlade-Menominee-Northern Oconto County-Door-Marathon-Shawano-
Wood-Portage-Waupaca-Outagamie-Brown-Kewaunee-Waushara-Winnebago-
Calumet-Manitowoc-Southern Marinette County-
Southern Oconto County-
220 AM CDT Tue Aug 18 2026
This Hazardous Weather Outlook is for north-central and northeast
Wisconsin.
.DAY ONE...Today and Tonight
There is a chance of thunderstorms this afternoon. An isolated
strong or severe storm with hail and gusty winds will be possible,
mainly along/south of Highway 29.
.DAYS TWO THROUGH SEVEN...Wednesday through Monday
There is a chance for thunderstorms Thursday afternoon into
Friday, though confidence in storm severity is low.
.SPOTTER INFORMATION STATEMENT...
Spotters are requested to report wind gusts over 40 mph and hail
to the National Weather Service in Green Bay.
$$
