Heavy Freezing Spray and Storm Warnings Issued for Grand Portage to Grand Marais MN
This alert is no longer in effect.
NOAA issued it on March 31, 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 Heavy Freezing Spray Warning and Storm Warning for the Minnesota coast of Lake Superior, with rapid ice accumulation and 50-knot gusts expected.
Read this weather record in 30 seconds
- Record type
- Heavy Freezing Spray Warning
- Affected area
- Grand Portage to Grand Marais MN
- Issued
- March 31, 2026
- Issuing authority
- NWS Duluth
The warning type, named area, and issue time define this record. Confirm all three against the original agency notice before treating it as current.
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 Heavy Freezing Spray Warning, a Storm Warning, and a Gale Warning for the Lake Superior coastal waters. These alerts indicate severe marine conditions that pose a significant threat to vessel stability and safety.
Affected Areas
The warning area specifically covers the region from Grand Portage to Grand Marais, MN (Zone LSZ140).
What You Should Do
Mariners are strongly advised to remain in port or alter course to avoid the warning area. If at sea, mariners should prepare for dangerous accumulation of ice on their vessels and conduct immediate mitigation. Vessels should be secured for severe conditions, including storm-force winds and hazardous waves.
Expected Conditions
- Freezing Spray: Heavy freezing spray is expected at a rate of 2 cm per hour or greater, which may cause rapid ice accretion on decks and superstructures.
- Wind: Northeast winds of 20 to 30 knots with gusts up to 40 knots are expected during the Gale Warning. During the Storm Warning, north winds will increase to 25 to 35 knots with gusts reaching 50 knots.
- Waves: Wave heights are forecast to range between 5 and 8 feet.
- Impacts: Rapid ice accumulation can lead to a catastrophic loss of vessel stability and render mechanical or electronic components inoperative. Storm-force winds and waves may capsize or damage vessels and significantly reduce visibility.
Timeline
- Gale Warning: Effective from 4:00 AM to 7:00 PM CDT Sunday.
- Heavy Freezing Spray Warning: Effective from 7:00 AM Sunday to 4:00 PM CDT Monday.
- Storm Warning: Effective from 7:00 PM Sunday to 4:00 PM CDT Monday.
Original source: NOAA Official Notice ↗
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