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Severe · Special Marine WarningThis alert has expired. It is kept for reference.

Special Marine Warning issued September 4 at 4:39AM EDT until September 4

Affecting Holland to Grand Haven MI; Grand Haven to Whitehall MI; Whitehall to Pentwater MI; 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

In effect until: Sep 4, 2026, 10:45 AM

Holland to Grand Haven MI; Grand Haven to Whitehall MI; Whitehall to Pentwater MI; 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

Likely impact; effects through 10:45 AM.

Move to safe harbor until hazardous weather passes.

Read the original bulletin (official text)
SMWGRR

The National Weather Service in Grand Rapids has issued a

* Special Marine Warning for...
Nearshore Waters from Holland to Pentwater MI...
Open Waters from South Haven to Manistee MI...

* Until 645 AM EDT.

* At 439 AM EDT, strong thunderstorms were located along a line
extending from 13 nm east of Sheboygan to 31 nm west of White Lake
Pier Heads to near Port Washington, moving east at 30 knots.

HAZARD...Wind gusts to nearly 50 knots and small hail.

SOURCE...Radar.

IMPACT...Small craft could be damaged in briefly higher winds and
suddenly higher waves.

* Locations impacted include...
White Lake Pier Heads, Holland Light, Little Sable Point Light,
Port Sheldon Harbor, Grand Haven Light, Muskegon Light, and The
White Lake Pierheads.
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Alert data: U.S. National Weather Service / NOAA · Translation: WeatherTranslate™