Heavy Freezing Spray Warning Issued for Lake Superior Near Upper Michigan
This alert is no longer in effect.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).
Areazine synthesizes this NWS weather alert directly from NOAA's official public data feed. See our methodology for full source attribution and refresh cadence.
The National Weather Service has issued a Heavy Freezing Spray Warning for parts of Lake Superior, effective Wednesday, as rapid ice accumulation poses a threat to vessel stability.
Read this weather record in 30 seconds
- Record type
- Heavy Freezing Spray Warning
- Affected area
- Lake Superior (Upper Michigan)
- Issued
- April 6, 2026
- Issuing authority
- NWS Marquette MI
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 Lake Superior (Upper Michigan).
Alert Details
The National Weather Service in Marquette, MI, has issued a Heavy Freezing Spray Warning for portions of Lake Superior. This alert is classified as a severe meteorological event with a high likelihood of occurrence.
Affected Areas
The warning covers Lake Superior from the Upper Entrance to Portage Canal to Manitou Island, MI. The affected zone extends 5 nautical miles offshore to the United States/Canadian border.
What You Should Do
Mariners are advised to prepare for dangerous accumulations of ice on their vessels. If possible, boaters should remain in port or avoid the warning area entirely. Those already at sea should conduct necessary mitigation measures to manage ice buildup.
Expected Conditions
Heavy freezing spray is expected to occur at a rate of 2 cm per hour or greater. This spray may rapidly accumulate on vessels, rendering mechanical and electronic components inoperative. Rapid ice accretion on decks and superstructures is a significant hazard that may result in a catastrophic loss of vessel stability.
Timeline
The Heavy Freezing Spray Warning is effective starting at 1:00 AM EST on Wednesday, February 25, 2026. The conditions are expected to persist until the warning expires at 4:00 PM EST on Wednesday afternoon.
Original source: NOAA Official Notice ↗
Related Weather Alerts
All Weather Alerts →Frequently Asked Questions
Common questions about this NWS weather alert.