Storm Warning and Heavy Freezing Spray Warning Issued for Grand Portage to Grand Marais MN

Alert Details

The National Weather Service in Duluth, MN, has issued a Storm Warning and a Heavy Freezing Spray Warning. These alerts are currently in effect and are scheduled to remain active until 4:00 PM CDT this afternoon.

Affected Areas

The warning specifically covers the coastal waters and shoreline from Grand Portage to Grand Marais, Minnesota.

What You Should Do

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

• Remain in port if possible.
• Avoid the warning area entirely.
• If currently at sea, alter course and secure the vessel for severe conditions.
• Conduct necessary mitigation to manage ice accumulation.

Expected Conditions

Severe maritime conditions are expected throughout the duration of the alert:

• Wind: North winds between 20 to 30 knots, with gusts reaching up to 50 knots.
• Waves: Significant wave heights between 3 to 6 feet.
• Freezing Spray: Heavy freezing spray is expected to accumulate at a rate of 2 cm per hour or greater.

Timeline

The warnings are effective immediately and are set to expire at 4:00 PM CDT on Monday, March 16, 2026.

Operating a vessel under these conditions is extremely hazardous. Rapid ice accretion on decks and superstructures can lead to a catastrophic loss of stability, while storm-force winds and waves may capsize or damage vessels and significantly reduce visibility.