Heavy Freezing Spray Warning and Gale Watch Issued for Central Lake Superior

Alert Details

The National Weather Service (NWS) in Marquette, MI, has issued a Heavy Freezing Spray Warning and a Gale Watch for the open waters of Lake Superior. The alert indicates a high probability of rapid ice accumulation on vessels, which poses a significant risk to maritime safety.

Affected Areas

The warning and watch apply to Lake Superior, specifically the area east of a line from Manitou Island to Marquette, MI, and west of a line from Grand Marais, MI, to the US/Canadian Border. This alert covers areas beyond 5 nautical miles from the shore.

What You Should Do

Mariners are strongly advised to prepare for dangerous ice accumulation. If possible, vessels should remain in port or seek safe harbor. Those currently in the warning area should consider altering course or conducting mitigation efforts to manage ice. Vessels should be secured for severe wind and waves to prevent damage or capsizing.

Expected Conditions

• Ice Accumulation: Heavy freezing spray is expected at a rate of 2 cm per hour or greater.
• Wind: North winds between 25 to 30 knots, with gusts reaching up to 35 knots.
• Waves: Wave heights of 7 to 12 feet are possible.
• Hazards: Rapid ice accretion on decks and superstructures may lead to a catastrophic loss of vessel stability. Freezing spray can also render mechanical and electronic components inoperative and reduce visibility.

Timeline

• Heavy Freezing Spray Warning: Effective from 1:00 PM Sunday, February 22, until 1:00 AM EST Monday, February 23.
• Gale Watch: Effective from Sunday afternoon through Monday morning.