Another complex of thunderstorms developed the night of the 8th into the 9th across the Northern Plains and pushed eastward across the Northland during the morning hours. Storms were weakening as they reached Lake Superior, but did produce a few strong gusts in the Grand Marais area to around 40 mph as they moved through.
Every event with a place to put it. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS DLH wrote it up.
Another complex of thunderstorms developed the night of the 8th into the 9th across the Northern Plains and pushed eastward across the Northland during the morning hours. Storms were weakening as they reached Lake Superior, but did produce a few strong gusts in the Grand Marais area to around 40 mph as they moved through.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Duluth, MN wrote its last area forecast discussion before the first event at Aug 9, 5:39 AM CST, 15 minutes earlier.
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</html>Hazardous Weather Outlook National Weather Service Duluth MN 417 AM CDT Sat Aug 9 2025 MNZ010>012-018>021-025-026-033>038-WIZ001>004-006>009-100930- Koochiching-North St. Louis-Northern Cook/Northern Lake- North Itasca-Central St. Louis-Southern Lake/North Shore- Southern Cook/North Shore-North Cass-South Itasca-South Cass- Crow Wing-Northern Aitkin-South Aitkin-Carlton/South St. Louis- Pine-Douglas-Bayfield-Ashland-Iron-Burnett-Washburn-Sawyer-Price- 417 AM CDT Sat Aug 9 2025 This Hazardous Weather Outlook is for portions of northeast Minnesota and northwest Wisconsin. .DAY ONE...Today and Tonight Strong to severe thunderstorms are expected across portions of northeast Minnesota and northwest Wisconsin this morning with damaging winds to 60 mph, heavy rainfall, large hail to quarter size, and dangerous lightning. This afternoon, thunderstorm chances will continue across northwest Wisconsin. A few storms could be strong to severe with gusty winds, large hail, locally heavy rain, and dangerous lightning .DAYS TWO THROUGH SEVEN...Sunday through Friday There is a 30 percent chance of thunderstorms across northeast Minnesota on Monday, and a 20 percent chance across northeast Minnesota and northwest Wisconsin on Thursday and Friday. .SPOTTER INFORMATION STATEMENT... Skywarn spotters may be needed today. LSZ121-140>148-150-100930- Bayfield to Oak Point WI-Grand Portage to Grand Marais MN- Grand Marais to Taconite Harbor MN- Taconite Harbor to Silver Bay Harbor MN- Silver Bay Harbor to Two Harbors MN-Two Harbors to Duluth MN- Duluth MN to Port Wing WI-Port Wing to Sand Island WI- Sand Island to Bayfield WI-Oak Point to Saxon Harbor WI- Outer Apostle Islands Beyond 5 NM from Mainland- 417 AM CDT Sat Aug 9 2025 This Hazardous Weather Outlook is for portions of Lake Superior and the Nearshore waters of western Lake Superior. .DAY ONE...Today and Tonight Scattered thunderstorms this morning, decreasing in coverage this afternoon. Wind gusts to 35 kts, dangerous cloud to water lightning and small hail are possible. .DAYS TWO THROUGH SEVEN...Sunday through Friday Gusty southwest winds on Sunday may produce hazardous conditions for small craft along the North Shore, north of Taconite Harbor. There is a 30 percent chance of thunderstorms on Monday, and a 20 percent chance on Thursday and Friday. PA More information may be obtained at the following web address: http://www.weather.gov/duluth
The Duluth radar (KDLH), 173 km away, was scanning. The volume nearest the first event began at 11:55 UTC.
2 marine thunderstorm wind. Local standard time, as filed.
A gust of 40 mph was recorded at the ASOS station KGNA Bay Of Grand Marais.
A gust of 39 mph was recorded by the MnDOT Mesonet station MN166 T.h.61 Grand Marais MP 110.8.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Lake Superior in 2025Every state in 2025This day in weather history
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-10-01. Each event’s entry at NCEI: 1290322, 1290324.