Heavy Freezing Spray and Gale Warnings Issued for Central Lake Superior

Alert Details

The National Weather Service in Marquette, MI, has issued a Heavy Freezing Spray Warning and a Gale Warning for portions of Lake Superior. These alerts signify hazardous conditions for maritime operations due to rapid ice accumulation and high winds.

Affected Areas

The warning covers Lake Superior east of a line from Manitou Island to Marquette, MI, and west of a line from Grand Marais, MI, to the US/Canadian border. The alert applies specifically to areas beyond 5 nautical miles (5NM) from the shore.

What You Should Do

Mariners are strongly advised to prepare for dangerous ice accumulation on their vessels. If possible, remain in port or seek safe harbor immediately. Those already at sea should avoid the warning area, alter course, and secure the vessel for hazardous conditions. Mitigation efforts should be conducted to manage ice buildup.

Expected Conditions

• Freezing Spray: Accumulation rates of 2 cm per hour or greater are expected, which can rapidly build up on decks and superstructures.
• Wind: South winds of 20 to 30 knots are forecast, with gusts reaching up to 40 knots.
• Waves: Significant wave heights between 8 to 13 feet are expected.
• Impacts: Heavy freezing spray can render mechanical and electronic components inoperative and cause a catastrophic loss of vessel stability. Strong winds and high waves may damage vessels, cause capsizing, or reduce visibility.

Timeline

• Initial Heavy Freezing Spray Warning: In effect until 7:00 PM EST this evening.
• Second Heavy Freezing Spray Warning: Effective from 6:00 AM to 4:00 PM EST Tuesday.
• Gale Warning: Effective from 7:00 AM to 7:00 PM EST Tuesday.