A very moist and unstable air mass in place and the presence of a nearly stationary frontal boundary produced several rounds of severe storms and flash flooding across portions of west and central Upper Michigan from the 16th into the 17th.  The hardest-hit area was in Houghton County where widespread rain amounts of 3 to almost 7 inches caused massive  flood damage to the City of Houghton and surrounding areas and resulted in one fatality.

Hail in MARQUETTE, MICHIGAN
From 16-JUN-18 05:20:00 to 16-JUN-18 05:30:00 (EST-5)
Location: WINTHROP JCT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

One inch diameter hail was reported in Ishpeming by an NWS employee.

Hail in DELTA, MICHIGAN
From 16-JUN-18 07:49:00 to 16-JUN-18 07:54:00 (EST-5)
Location: GLADSTONE
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Dime-sized hail was observed in Gladstone.

Thunderstorm Wind in MENOMINEE, MICHIGAN
From 16-JUN-18 09:40:00 to 16-JUN-18 09:45:00 (CST-6)
Location: TALBOT
Magnitude: 50.00 EG
Property damage: 0.50K
Crop damage: 0.00K
Reported by: Law Enforcement

The Menominee County Sheriff reported a tree down across the railroad line near the intersection of U.S. Highway 41 and County Road 366 in Talbot.

Flash Flood in DICKINSON, MICHIGAN
From 16-JUN-18 10:00:00 to 16-JUN-18 14:00:00 (CST-6)
Location: VULCAN
Flood cause: Heavy Rain
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Broadcast media relayed reports of fields flooded in the Vulcan area.  Also, two six-inch diameter trees were downed in the area.

Thunderstorm Wind in GOGEBIC, MICHIGAN
From 17-JUN-18 16:04:00 to 17-JUN-18 16:10:00 (CST-6)
Location: BESSEMER
Magnitude: 55.00 EG
Property damage: 8.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported numerous trees and power lines down in Bessemer via Public Safety Radio.

Flash Flood in GOGEBIC, MICHIGAN
From 17-JUN-18 15:12:00 to 17-JUN-18 17:12:00 (CST-6)
Location: IRONWOOD
Flood cause: Heavy Rain
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Possible roads washed out near Cloverland Cinemas per Public Safety Radio.  Much of Ironwood, including stores along Highway US-2, was without electricity on Sunday evening the 17th due to storms and flooding. Homeowners reported flooded basements.

Thunderstorm Wind in GOGEBIC, MICHIGAN
From 17-JUN-18 15:58:00 to 17-JUN-18 16:05:00 (CST-6)
Location: HURLEY
Magnitude: 55.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported numerous trees and power lines down in the Ironwood area via Public Safety Radio.

Thunderstorm Wind in GOGEBIC, MICHIGAN
From 17-JUN-18 16:00:00 to 17-JUN-18 16:05:00 (CST-6)
Location: HURLEY
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported trees down along Pioneer Road via Public Safety Radio.

Thunderstorm Wind in GOGEBIC, MICHIGAN
From 17-JUN-18 16:24:00 to 17-JUN-18 16:30:00 (CST-6)
Location: MARENISCO
Magnitude: 50.00 EG
Property damage: 4.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported multiple trees down on Highway US-2 near Marenisco.  Report relayed via Public Safety Radio.

Flash Flood in GOGEBIC, MICHIGAN
From 17-JUN-18 16:50:00 to 17-JUN-18 18:00:00 (CST-6)
Location: MARENISCO
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Fair Avenue was possibly flooded.  Report was relayed via Public Safety Radio.

Thunderstorm Wind in ONTONAGON, MICHIGAN
From 17-JUN-18 17:45:00 to 17-JUN-18 17:50:00 (EST-5)
Location: PAULDING
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: COOP Observer

The observer in Paulding reported via social media that a sign was damaged at the COOP site there.

Flash Flood in MENOMINEE, MICHIGAN
From 16-JUN-18 11:00:00 to 16-JUN-18 14:30:00 (CST-6)
Location: SPALDING
Flood cause: Heavy Rain
Property damage: 175.00K
Crop damage: 0.00K
Reported by: Social Media

Nearly three inches of heavy rain flooded or washed out 40 to 50 roads from Spalding Township through Daggett to Stephenson.  The Menominee County Emergency Manager reported that flooding damaged farms and toppled trees in the area as well.  There were only two homes with damage reports such as basement flooding. The Stephenson Fire Department started a pumping operation, which local farmers assisted with as well, to pump around 12,000 gallons per minute to stay ahead of the flooding. Governor Rick Snyder declared a state of disaster for Menominee County as flood damage estimates totaled nearly $175,000.

Flash Flood in HOUGHTON, MICHIGAN
From 17-JUN-18 03:00:00 to 17-JUN-18 11:00:00 (EST-5)
Location: ALCONE
Flood cause: Heavy Rain
Property damage: 100.00M
Crop damage: 0.00K
Reported by: Emergency Manager

Three to nearly seven inches of rainfall in the early morning hours of the 17th caused widespread and catastrophic flash flooding across much of Houghton County from Chassell through Houghton/Hancock to Dollar Bay, Hubbell and Lake Linden.  The NOAA Precipitation Frequency Atlas indicated a 1000-year recurrence interval for rainfall  amounts of the magnitude which occurred during this event. The Houghton County emergency manager reported that nearly all roads were impassable in central and southern Houghton County. Many homes and businesses were flooded throughout the area, particularly in Houghton/Hancock where one fatality occurred when a basement collapsed at a home on Canal Road.  The Administration Building at Michigan Tech University also sustained flood damage. Governor Rick Snyder declared a state of disaster for Houghton County a day after the flooding occurred and damage estimates from flooding are currently over $100 million. Recovery efforts will be ongoing over Houghton County for the next several months.

Flash Flood in MARQUETTE, MICHIGAN
From 17-JUN-18 15:00:00 to 17-JUN-18 20:35:00 (EST-5)
Location: CLOWRY
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: NWS Employee

Rainfall amounts between two and three inches over approximately five hours caused flooding of several roads from Marquette and Harvey to Negaunee.  The Marquette County Road Commission reported the washout and closure of a portion of County Road 601 in Humboldt Township due to the heavy rains.  A NWS employee reported the closure of Lakeshore Boulevard in Marquette due to mud and debris flowing over the street.  Several other streets were reported closed in Marquette due to water over the roads.  Rescue personnel from the Chocolay Fire and Sheriff departments were evacuating residences along Green Garden Road at the Chocolay River Bridge southeast of Harvey. There was also a picture via social media of water under the bridge in Negaunee, and several residences in Negaunee reported water in the basements due to the heavy rain.