Storm Warning and Heavy Freezing Spray Warning Issued for Grand Portage to Grand Marais MN
This alert is no longer in effect.
NOAA issued it on April 6, 2026, 4 months ago. Warnings of this kind stay in effect for hours to a few days, so this page is a historical record of what was issued, not a current warning. For conditions where you are right now, check weather.gov (US), weather.gc.ca (Canada), the Met Office (UK), or the Bureau of Meteorology (Australia).
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The National Weather Service has issued a Storm Warning and Heavy Freezing Spray Warning for the Lake Superior shoreline between Grand Portage and Grand Marais through Monday afternoon.
Read this weather record in 30 seconds
- Record type
- Storm Warning
- Affected area
- Grand Portage to Grand Marais MN
- Issued
- April 6, 2026
- Issuing authority
- NWS Duluth
Storm notices can cover different combinations of wind, hail, lightning, and rainfall. Use the original notice for the hazards and boundaries attached to this specific record.
Record status: historical. It was issued 4 months ago; use the issuing agency's live warning service for current conditions in 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.
Original source: NOAA Official Notice ↗
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