Increasing moisture and instability ahead of cold front approaching from the Northern Plains aided the development of strong to severe thunderstorms over portions of western Upper Michigan from the afternoon of the 9th into the morning of the 10th.

Flash Flood in GOGEBIC, MICHIGAN
From 09-AUG-20 17:00:00 to 09-AUG-20 20:00:00 (CST-6)
Location: CONNORVILLE
Flood cause: Heavy Rain
Property damage: 4.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Gogebic County Sheriff's department reported that a portion of Highway US-2 was flooded with stranded vehicles.  Highway US-2 was closed from Douglas Boulevard to Lowell Street.  Law enforcement also reported a downed power line nearby in Ironwood. Nearly an inch and a half of rainfall from thunderstorms over a three-hour period caused the flooding.

Thunderstorm Wind in MARQUETTE, MICHIGAN
From 09-AUG-20 22:00:00 to 09-AUG-20 22:05:00 (EST-5)
Location: CLARKSBURG
Magnitude: 60.00 EG
Property damage: 7.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Numerous softwood trees were snapped and uprooted near Clarksburg.  The time of the report was estimated from radar.

Tornado in IRON, MICHIGAN
From 09-AUG-20 20:20:00 to 09-AUG-20 20:25:00 (CST-6)
Location: SCOTT LAKE
Tornado F-scale: EF0
Property damage: 70.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Tornado damage was confirmed by NWS storm survey team with numerous hardwood and softwood trees snapped off or uprooted on its path along and north of the Brule River in Iron County.  Time of the damage was estimated from radar.

Thunderstorm Wind in IRON, MICHIGAN
From 09-AUG-20 19:43:00 to 09-AUG-20 19:48:00 (CST-6)
Location: BASSWOOD
Magnitude: 70.00 EG
Property damage: 150.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

The NWS storm survey found widespread extensive tree damage on both sides of Golden Lake in Iron County.  At least a hundred healthy softwood and hardwood trees were snapped and uprooted, some causing minor damage to homes in the area.  One camper had to be rescued after being trapped by falling trees but was uninjured.  Time of the report was estimated from radar.

Thunderstorm Wind in MARQUETTE, MICHIGAN
From 09-AUG-20 21:51:00 to 09-AUG-20 21:56:00 (EST-5)
Location: WOBIS
Magnitude: 60.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Two fresh pine trees about a foot in diameter were uprooted on the side of Highway M-95 northeast of Republic.  The time of the report was estimated from radar.

Hail in HOUGHTON, MICHIGAN
From 09-AUG-20 15:45:00 to 09-AUG-20 15:55:00 (EST-5)
Location: ALSTON
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

The spotter near Alston observed hail up to penny-sized which lasted for about ten minutes.

Thunderstorm Wind in MARQUETTE, MICHIGAN
From 09-AUG-20 22:21:00 to 09-AUG-20 22:26:00 (EST-5)
Location: (MQT)MARQUETTE CO AR
Magnitude: 55.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported downed power lines on Highway US-41 near Heritage Drive causing power outages.  The NWS Marquette also took a power hit and was on generator power for a period.

Thunderstorm Wind in MARQUETTE, MICHIGAN
From 09-AUG-20 22:40:00 to 09-AUG-20 22:45:00 (EST-5)
Location: GREENWOOD
Magnitude: 55.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement dispatch reported downed power lines across a driveway on County Road CD southwest of Ishpeming.

Thunderstorm Wind in MARQUETTE, MICHIGAN
From 09-AUG-20 22:44:00 to 09-AUG-20 22:49:00 (EST-5)
Location: NEGAUNEE
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported a tree down from thunderstorm winds across Miller Road in New Buffalo location near Negaunee.

Thunderstorm Wind in MARQUETTE, MICHIGAN
From 09-AUG-20 22:08:00 to 09-AUG-20 22:13:00 (EST-5)
Location: PARTRIDGE
Magnitude: 50.00 EG
Property damage: 0.50K
Crop damage: 0.00K
Reported by: Social Media

There was a damage report via social media of a brand new trampoline bent and torn along with a shattered planter on a deck.

Thunderstorm Wind in MARQUETTE, MICHIGAN
From 09-AUG-20 22:04:00 to 09-AUG-20 22:09:00 (EST-5)
Location: WEST ISHPEMING
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Social Media

There was a report of half a tree down and a power outage near Ishpeming from thunderstorm winds.   Time of the report was estimated from radar.

Thunderstorm Wind in IRON, MICHIGAN
From 09-AUG-20 20:52:00 to 09-AUG-20 20:59:00 (CST-6)
Location: CRYSTAL FALLS IRON C
Magnitude: 70.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Social Media

Photos received through social media indicated at least a dozen trees were snapped or uprooted from thunderstorm winds near Peavy Falls Dam.

Thunderstorm Wind in MARQUETTE, MICHIGAN
From 09-AUG-20 21:52:00 to 09-AUG-20 22:58:00 (EST-5)
Location: WOBIS
Magnitude: 60.00 EG
Property damage: 1.50K
Crop damage: 0.00K
Reported by: Public

Two trees at least a foot in diameter were uprooted by thunderstorm winds in Champion.

Flash Flood in HOUGHTON, MICHIGAN
From 09-AUG-20 22:00:00 to 10-AUG-20 00:00:00 (EST-5)
Location: FREDA
Flood cause: Heavy Rain
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Public

There was a report and video received on social media of water flowing over the roads near the intersection of Massie Road and US-Highway 41 in Chassell.   There was also a video received of a business in Chassell surrounded by about a foot of standing water.  Three to four inches of rainfall over a couple hours time caused the localized flooding over the area.

Thunderstorm Wind in HOUGHTON, MICHIGAN
From 09-AUG-20 20:56:00 to 09-AUG-20 21:01:00 (EST-5)
Location: SIDNAW
Magnitude: 55.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Broadcast Media

There was a picture posted on social media from one of the local TV stations of a large portion of a tree downed on power lines south of Sidnaw.

Thunderstorm Wind in IRON, MICHIGAN
From 09-AUG-20 20:44:00 to 09-AUG-20 20:50:00 (CST-6)
Location: BASSWOOD
Magnitude: 70.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Social Media

There was a photo submitted to local media of numerous trees down near Golden Lake in Iron County.  The time of the report was estimated from radar.

Thunderstorm Wind in MARQUETTE, MICHIGAN
From 09-AUG-20 21:52:00 to 09-AUG-20 21:57:00 (EST-5)
Location: WOBIS
Magnitude: 56.00 EG
Property damage: 1.50K
Crop damage: 0.00K
Reported by: Social Media

There was a photo submitted to local media of two trees at least a foot in diameter uprooted in Champion.  The time of the report was estimated by radar.

Thunderstorm Wind in IRON, MICHIGAN
From 09-AUG-20 21:52:00 to 09-AUG-20 21:57:00 (CST-6)
Location: CRYSTAL FALLS IRON C
Magnitude: 74.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Social Media

There were photos received through social media of at least a dozen trees snapped or uprooted near Peavy Pond Road.  The time of the report was estimated from radar.

Flash Flood in HOUGHTON, MICHIGAN
From 09-AUG-20 22:00:00 to 10-AUG-20 00:00:00 (EST-5)
Location: LAKE ROLAND
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Trained Spotter

There were multiple shoulder washouts along Pike Lake Road.  There were also some docks on local lakes underwater.  The time of the report was estimated from radar.

Thunderstorm Wind in MARQUETTE, MICHIGAN
From 09-AUG-20 22:30:00 to 09-AUG-20 22:35:00 (EST-5)
Location: DIORITE
Magnitude: 60.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported multiple power lines down along County Roads CJ and 496 in Ely Township.

Tornado in IRON, MICHIGAN
From 09-AUG-20 20:56:00 to 09-AUG-20 20:57:00 (CST-6)
Location: CRYSTAL FALLS IRON C
Tornado F-scale: EF1
Property damage: 100.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

At least 50 to 100 healthy softwood and hardwood trees were snapped and uprooted on both sides of the road where NWS personnel has access to the path.  The tornado, with estimated wind speed of 105 mph, started at Peavy Pond Road and took a path over the northern end of Peavy Pond.   Damage could be seen where the tornado moved back onshore and across a small island.

Thunderstorm Wind in IRON, MICHIGAN
From 09-AUG-20 19:54:00 to 09-AUG-20 20:00:00 (CST-6)
Location: GIBBS
Magnitude: 65.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Department of Highways

The Iron County Road Commission reported clearing numerous trees fallen on power lines along Gold Mine Road for about four miles northeast of the intersection with Basswood Road.  The time of the report was estimated from radar.