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

Special Marine Warning issued September 2 at 4:05PM EDT until September 2

Affecting Port Austin to Harbor Beach MI; Harbor Beach to Port Sanilac MI; Port Sanilac to Port Huron MI; Lake Huron from Port Austin to Harbor Beach 5NM Off Shore to the US/Canadian border; Lake Huron from Harbor Beach to Port Sanilac 5NM Off Shore to US/Canadian border; Lake Huron from Port Sanilac to Port Huron 5NM Off Shore to US/Canadian border

In effect until: Sep 2, 2026, 9:30 PM

Port Austin to Harbor Beach MI; Harbor Beach to Port Sanilac MI; Port Sanilac to Port Huron MI; Lake Huron from Port Austin to Harbor Beach 5NM Off Shore to the US/Canadian border; Lake Huron from Harbor Beach to Port Sanilac 5NM Off Shore to US/Canadian border; Lake Huron from Port Sanilac to Port Huron 5NM Off Shore to US/Canadian border

Likely impact; effects through 9:30 PM.

Move to safe harbor until hazardous weather passes. Frequent lightning is occurring with this storm. If caught on the open water stay below deck if possible, keep away from ungrounded metal objects.

Read the original bulletin (official text)
For the following areas...
Harbor Beach to Port Sanilac MI...
Lake Huron from Harbor Beach to Port Sanilac 5NM Off Shore to
US/Canadian border...
Lake Huron from Port Austin to Harbor Beach 5NM Off Shore to the
US/Canadian border...
Lake Huron from Port Sanilac to Port Huron 5NM Off Shore to
US/Canadian border...
Port Austin to Harbor Beach MI...
Port Sanilac to Port Huron MI...

At 405 PM EDT, a severe thunderstorm was located 9 nm north of Port
Sanilac, moving east at 50 knots.

HAZARD...Wind gusts in excess of 50 knots and large hail.

SOURCE...Radar indicated.

IMPACT...Boats could suffer significant structural damage in high
winds and hail. Small craft could capsize in suddenly
higher waves.

The severe thunderstorm will remain over mainly open waters.
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Alert data: U.S. National Weather Service / NOAA · Translation: WeatherTranslate™