Severe Severe Storm ● Closed

Special Marine Warning — Silver Bay Harbor to Two Harbors MN; Two Harbors to Duluth MN; Duluth MN to Port Wing WI; Port Wing to Sand Island WI; Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM

Event time: Aug 25, 2026 22:48 UTC Last updated: Sep 6, 2026 United States

Icon = what happened · ring colour = how serious: Extreme Severe Moderate Minor

Loading live data… · Marker positions are approximate; severity is labelled in each popup. Sources: USGS, GDACS, NASA EONET, NOAA/NWS, EMSC.

Special Marine Warning issued August 25 at 5:48PM CDT until August 25 at 6:45PM CDT by NWS Duluth MN

Measurements

Coordinates	46.8600, -91.7675
Region	Silver Bay Harbor to Two Harbors MN; Two Harbors to Duluth MN; Duluth MN to Port Wing WI; Port Wing to Sand Island WI; Lake Superior west of a line from Sa
Nws Urgency	Immediate
Nws Certainty	Likely
Expires	2026-08-25T18:45:00-05:00

Official source

Weather alert data courtesy of NOAA / National Weather Service

This is an official warning issued by the authority named above. Follow its instructions and those of your local emergency services.

Severity as published by US National Weather Service.

View original report

This event as JSON · API and licence

Source updated 61 days ago (Aug 25, 2026 23:44 UTC) · we last heard from US National Weather Service 17 seconds ago

On a slow connection? Low-bandwidth version — no map, no scripts, under 14 KB.

Official authorities in United States

If you are there, these are the bodies whose instructions apply. This site is not an emergency service and does not issue warnings.

More for United States →

Earlier severe storm events in United States

Severe and extreme events of the same kind, before this one. Listed for scale, not because they are connected to it.

Severe Thunderstorm Warning — Edwards, IL; Wabash, IL; White, IL; Gibson, IN; Posey, IN Severe Severe Storm United States closed via NWS Jul 26, 2026 Severe Thunderstorm Warning — Edwards, IL; Wabash, IL; White, IL; Gibson, IN; Posey, IN; Vanderburgh, IN; Henderson, KY; Union, KY Severe Severe Storm United States closed via NWS Jul 26, 2026 Severe Thunderstorm Warning — Marion, IL Severe Severe Storm United States closed via NWS Jul 26, 2026 Severe Thunderstorm Warning — Black Hawk, IA Severe Severe Storm United States closed via NWS Jul 26, 2026

Nearby & related events

yellow advisory - fog - in effect — City of Thunder Bay, Canada Moderate Extreme Weather Canada monitoring via WMO 3 days ago yellow advisory - fog - in effect — City of Thunder Bay, Canada Moderate Extreme Weather Canada monitoring via WMO 3 days ago yellow advisory - fog - in effect — City of Thunder Bay, Canada Moderate Extreme Weather Canada monitoring via WMO 3 days ago yellow advisory - fog - in effect — City of Thunder Bay, Canada Moderate Extreme Weather Canada monitoring via WMO 3 days ago yellow advisory - fog - in effect — City of Thunder Bay, Canada Moderate Extreme Weather Canada monitoring via WMO 3 days ago

Disclaimer: figures are automatic feeds from the named agencies and may be revised. Do not use this page for life-safety decisions — follow official local emergency services.