Special Marine Warning Issued for Lake Superior and Apostle Islands
This alert is no longer in effect.
NOAA issued it on May 1, 2026, 3 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.
A Special Marine Warning is in effect for areas including Duluth MN to Port Wing WI and parts of Lake Superior, with potential waterspouts and wind gusts up to 34 knots until 6:45 PM CDT.
Read this weather record in 30 seconds
- Record type
- Special Marine Warning
- Affected area
- Lake Superior Region
- Issued
- May 1, 2026
- Issuing authority
- NWS Duluth MN
Marine notices apply to named waters or shoreline zones. They may not describe conditions on land, even when the nearest place name is the same.
Record status: historical. It was issued 3 months ago; use the issuing agency's live warning service for current conditions in Lake Superior Region.
Alert Details
A Special Marine Warning has been issued by the National Weather Service (NWS) Duluth MN. This alert is effective from 5:56 PM CDT on April 23, 2026, until 6:45 PM CDT on the same day.
Affected Areas
The warning affects the following regions: Duluth MN to Port Wing WI; Port Wing to Sand Island WI; Sand Island to Bayfield WI; Outer Apostle Islands Beyond 5 NM from Mainland; and Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM. Specific locations include Sand Island, Siskwit Bay, Apostle Island Sea Caves, Maikwe Bay, Herbster, Meyers Beach, York Island, Bark Bay, Eagle Island, Port Wing Harbor, Bark Point, Sand Bay, and Apostle Islands National Lake Shore.
What You Should Do
Residents and boaters in the affected areas should move to safe harbor until the hazardous weather passes.
Expected Conditions
The warning is for a severe thunderstorm capable of producing waterspouts and wind gusts of 34 knots or greater. These conditions are based on radar detection.
Timeline
The alert becomes effective at 5:56 PM CDT on April 23, 2026, and is expected to end at 6:45 PM CDT on April 23, 2026.
Original source: NOAA Official Notice ↗
Related Weather Alerts
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Two Areazine-derived peer sets for this NWS weather alert: nearest notices by body length and by same severity near the same agency date. Peers come from other categories so they are not the same-feed Related list above.
Similar body length
Nearest notices by article body length (1,161 characters here).
Similar severity timing
Same severity (high) notices issued closest in time to May 1, 2026.
Frequently Asked Questions
Common questions about this NWS weather alert.