Heavy Freezing Spray Warning Issued for Munising to Grand Marais MI Through Monday Morning

Alert Details

The National Weather Service in Marquette, MI, has issued a Heavy Freezing Spray Warning for the coastal waters of Lake Superior. This alert is issued alongside a Small Craft Advisory and a Gale Watch, indicating significant hazards for maritime activities in the region.

Affected Areas

The primary geographic scope of this alert covers the Michigan coastline from Munising to Grand Marais. This includes the nearshore waters and zones identified under UGC LSZ250.

What You Should Do

Mariners are advised to prepare for a dangerous accumulation of ice on their vessels. The National Weather Service recommends the following actions:

• If possible, remain in port or seek safe harbor immediately.
• Avoid the warning area or conduct necessary ice mitigation if already at sea.
• Alter course to avoid hazardous conditions and secure vessels for severe wind and waves.
• Monitor mechanical and electronic components, as freezing spray can render them inoperative.

Expected Conditions

• Ice Accretion: Heavy freezing spray is expected at a rate of 2 cm per hour or greater, which may rapidly accumulate on decks and superstructures.
• Wind Speeds: North winds of 20 to 25 knots are expected, with gusts reaching up to 35 knots during the Gale Watch period.
• Wave Heights: Waves are forecast to range between 6 to 11 feet during the height of the storm.
• Hazards: Rapid ice buildup can result in a catastrophic loss of vessel stability. Strong winds and high waves may capsize or damage vessels and significantly reduce visibility.

Timeline

• Small Craft Advisory: In effect until 4 PM EST Saturday, February 21.
• Heavy Freezing Spray Warning: Effective from 1 PM Sunday, February 22, until 1 AM EST Monday, February 23.
• Gale Watch: Effective from Sunday afternoon through Monday morning, February 23.