Heavy Freezing Spray Warning and Gale Watch Issued for Lake Superior Near Upper Michigan

Alert Details

The National Weather Service (NWS) in Marquette, MI, has issued a Heavy Freezing Spray Warning and a Gale Watch for specific marine zones in Lake Superior. The alert (VTEC: /O.NEW.KMQT.UP.W.0010.260222T0600Z-260223T0600Z/) highlights a significant threat to maritime safety due to rapid ice accumulation and severe wind conditions.

Affected Areas

The warning and watch cover Lake Superior from the Upper Entrance to Portage Canal to Manitou Island, MI, extending 5 nautical miles offshore to the US/Canadian Border.

What You Should Do

Mariners are strongly advised to prepare for dangerous ice accumulation on their vessels. If possible, remain in port, avoid the warning area, or conduct immediate mitigation. Mariners should consider altering plans to avoid hazardous conditions, seek safe harbor, and secure vessels for severe wind and waves.

Expected Conditions

• Freezing Spray: Heavy freezing spray is expected at a rate of 2 cm per hour or greater. This can rapidly accumulate on vessels, potentially rendering mechanical and electronic components inoperative and causing a catastrophic loss of stability.
• Wind and Waves: North winds of 25 to 30 knots are forecast, with gusts up to 40 knots possible. Waves are expected to reach heights of 6 to 11 feet.
• Visibility: Strong winds and heavy spray may cause hazardous waves that could capsize or damage vessels and significantly reduce visibility.

Timeline

• Heavy Freezing Spray Warning: In effect from 1:00 AM Sunday to 1:00 AM EST Monday.
• Gale Watch: In effect from Sunday afternoon through late Sunday night.