A cold front worked across the area from north to south during the evening. Rich, low-level moisture was in place ahead of the front and numerous strong to severe storms developed.
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.
A cold front worked across the area from north to south during the evening. Rich, low-level moisture was in place ahead of the front and numerous strong to severe storms developed. Storm motion was west to east parallel to the front and heavy rainfall was being observed. A few of the storms maintained intensity as they moved over Lake Superior.
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 Jul 8, 5:49 PM CST, 13 hours 17 minutes earlier.
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</html>Hazardous Weather Outlook National Weather Service Duluth MN 323 PM CDT Sun Jul 8 2018 MNZ010>012-018>021-025-026-033>038-WIZ001>004-006>009-092030- 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- 323 PM CDT Sun Jul 8 2018 This Hazardous Weather Outlook is for portions of northeast Minnesota and northwest Wisconsin. .DAY ONE...This afternoon and Tonight Strong to severe thunderstorms are expected to develop late this afternoon and continue into this evening across much of northeast Minnesota into parts of northwest Wisconsin. These storms will be capable of producing large hail, damaging winds, and heavy rainfall leading to flash flooding. A Flash Flood Watch remains in effect tonight for much of northeast Minnesota. .DAYS TWO THROUGH SEVEN...Monday through Saturday Thunderstorms are possible Wednesday afternoon through Thursday as a cool front moves eastward across the Northland. Some storms may be strong to severe. Another round of thunderstorms is forecast Saturday. .SPOTTER INFORMATION STATEMENT... Skywarn Spotters may be needed late this afternoon into tonight. Reports of rainfall and flooding from spotters and the public are requested. LSZ121-140>148-092030- 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- 323 PM CDT Sun Jul 8 2018 This Hazardous Weather Outlook is for portions of the Nearshore waters of western Lake Superior. .DAY ONE...This afternoon and Tonight Strong southwest winds will continue through this evening which will create hazardous conditions to smaller vessels. A Small Craft Advisory remains in effect for areas along the north shore. Thunderstorms are expected to develop this afternoon and continue through this evening. Some storms may be strong to severe with frequent lightning, large hail, gusty winds, and torrential rain which will reduce visibility. .DAYS TWO THROUGH SEVEN...Monday through Saturday Thunderstorms are possible Wednesday afternoon through Thursday, and again on Saturday. The storms mid-week may be strong to severe. JJM/Huyck More information may be obtained at the following web address: http://www.weather.gov/duluth (all lower case)
The Duluth radar (KDLH), 108 km away, was scanning. The volume nearest the first event began at 13:05 UTC.
1 marine thunderstorm wind. Local standard time, as filed.
The gust was recorded by mesonet station D6222 2 miles southeast of Bayfield, WI, at the west end of Madeline Island.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Lake Superior in 2018Every state in 2018This 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: 773714.