An upper disturbance moving through a warm, moist and unstable environment set the stage for the development of isolated severe thunderstorms, heavy rainfall and flooding over portions of west and central Upper Michigan during the afternoon and evening of the 12th. Governor Whitmer declared a state of emergency for the flood damage in western Marquette County.

Flash Flood in MARQUETTE, MICHIGAN
From 12-MAY-22 16:00:00 to 12-MAY-22 19:00:00 (EST-5)
Location: NORTH LAKE
Flood cause: Heavy Rain
Property damage: 3.00M
Crop damage: 0.00K
Reported by: Broadcast Media

Heavy rainfall of three to four inches from thunderstorms over an approximate three-hour time period caused flooding from downtown Ishpeming across County Road 510 at the Noquemanon 510 Trailhead to County Road 550 near Wetmore Landing and Harlow Lake.  The flooding in Ishpeming caused multiple cars to get stranded in nearly 2 feet of water near the U.S. National Ski Hall of Fame and water over the road on Hill Street.  Flooding also closed portions of County Road 510 near the Noquemanon 510 Trailhead and portions of County Road 550 were closed near Wetmore Landing and Harlow Lake.  In July, Governor Whitmer declared a state of emergency for the flood damage in western Marquette County on 5/12.

Hail in DICKINSON, MICHIGAN
From 12-MAY-22 14:47:00 to 12-MAY-22 14:52:00 (CST-6)
Location: FELCH
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

There was a social media report of one inch diameter hail observed near Felch.

Heavy Rain in IRON, MICHIGAN
From 12-MAY-22 16:00:00 to 12-MAY-22 18:00:00 (CST-6)
Location: CRYSTAL FALLS IRON C
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

There was a social media report of 2.65 inches of rainfall just west of Peavy Falls on the afternoon and evening of the 12th.  Photos posted showed a stream overtopping its banks, and water was also flowing over driveways from backed up culverts.

Thunderstorm Wind in DICKINSON, MICHIGAN
From 12-MAY-22 16:19:00 to 12-MAY-22 16:24:00 (CST-6)
Location: (IMT)IRON MTN ARPT
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The ASOS at Ford Airport near Iron Mountain measured a peak thunderstorm wind gust of 59 mph.

Flash Flood in DICKINSON, MICHIGAN
From 12-MAY-22 13:00:00 to 12-MAY-22 17:00:00 (CST-6)
Location: IRON MTN
Flood cause: Heavy Rain
Property damage: 2.00K
Crop damage: 0.00K
Reported by: COOP Observer

More than three inches of heavy rainfall caused partial flooding of roadways and parking lots in Iron Mountain and also caused standing water on Cemetery Road in Foster City.

Hail in MARQUETTE, MICHIGAN
From 12-MAY-22 16:11:00 to 12-MAY-22 16:16:00 (EST-5)
Location: SAND RIVER
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

A picture from Twitter showed nickel-sized hail from a thunderstorm at Shot Point.

Hail in MARQUETTE, MICHIGAN
From 12-MAY-22 15:52:00 to 12-MAY-22 15:58:00 (EST-5)
Location: SANDS
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Social media reports from Sands observed penny-sized hail.

Hail in MARQUETTE, MICHIGAN
From 12-MAY-22 15:45:00 to 12-MAY-22 15:50:00 (EST-5)
Location: GORDON
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

There was a public report of nickel-sized hail just southwest of Shot Point.