An upper disturbance moving across a warm and unstable air mass generated isolated severe thunderstorms across west half portions of Upper Michigan on the 26th.

Hail in MARQUETTE, MICHIGAN
From 26-MAY-18 11:29:00 to 26-MAY-18 11:44:00 (EST-5)
Location: (MQT)MARQUETTE CO AR
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Hail and heavy rain were observed for approximately 15 minutes at the National Weather Service in Negaunee Township.   The largest hailstones were one inch in diameter.

Hail in MARQUETTE, MICHIGAN
From 26-MAY-18 11:30:00 to 26-MAY-18 11:40:00 (EST-5)
Location: (MQT)MARQUETTE CO AR
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

One inch diameter hail was observed just south of the Dead River Basin and north of Negaunee.

Hail in MARQUETTE, MICHIGAN
From 26-MAY-18 11:30:00 to 26-MAY-18 11:40:00 (EST-5)
Location: EAGLE MILLS
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Dime and penny sized hail were observed along Midway Drive and Marquette County Road 510.

Hail in MARQUETTE, MICHIGAN
From 26-MAY-18 11:33:00 to 26-MAY-18 11:40:00 (EST-5)
Location: NEGAUNEE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

One inch diameter hail was observed a few blocks just to the north of downtown Negaunee.

Hail in MARQUETTE, MICHIGAN
From 26-MAY-18 13:45:00 to 26-MAY-18 13:50:00 (EST-5)
Location: ISHPEMING
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Nickel sized hail was observed just to the south of Al Quall Recreational Area in Ishpeming.

Hail in BARAGA, MICHIGAN
From 26-MAY-18 14:49:00 to 26-MAY-18 14:54:00 (EST-5)
Location: HERMAN
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

The observer in Herman measured one inch diameter hail.

Hail in DICKINSON, MICHIGAN
From 26-MAY-18 14:10:00 to 26-MAY-18 14:15:00 (CST-6)
Location: HARDWOOD
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

There was a report of sporadic nickel and quarter-sized hail at Stromberg Park near Foster City.

Hail in MENOMINEE, MICHIGAN
From 26-MAY-18 14:55:00 to 26-MAY-18 15:03:00 (CST-6)
Location: WILSON
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

The spotter near Wilson reported that hail fell for eight minutes, ranging in size from one inch in diameter to golf ball sized.

Hail in MENOMINEE, MICHIGAN
From 26-MAY-18 15:13:00 to 26-MAY-18 15:18:00 (CST-6)
Location: HERMANSVILLE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

One inch diameter hail was reported by the public at Hermansville.

Hail in MENOMINEE, MICHIGAN
From 26-MAY-18 15:21:00 to 26-MAY-18 15:26:00 (CST-6)
Location: SPALDING
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Post Office

One inch diameter hail was reported by the public in Spalding.

Hail in MARQUETTE, MICHIGAN
From 26-MAY-18 16:02:00 to 26-MAY-18 16:07:00 (EST-5)
Location: REPUBLIC
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

The spotter in Republic reported hail up to one inch in diameter.

Hail in MENOMINEE, MICHIGAN
From 26-MAY-18 16:15:00 to 26-MAY-18 16:20:00 (CST-6)
Location: BEACH GROVE
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

There was a public report of penny-sized hail five miles southwest of Cedar River.

Hail in DICKINSON, MICHIGAN
From 26-MAY-18 14:10:00 to 26-MAY-18 14:15:00 (CST-6)
Location: HARDWOOD
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

There was a delayed report by broadcast media of two inch diameter hail in Helps, MI.

Thunderstorm Wind in MENOMINEE, MICHIGAN
From 26-MAY-18 15:01:00 to 26-MAY-18 15:10:00 (CST-6)
Location: SPALDING
Magnitude: 55.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Social Media

There was a delayed report and photo via social media of an old garage blown onto Ekberg Road in Spalding.  Other reports of minor wind damage were received in Nadeau and Spalding townships, but no specific time or location were shared.

Hail in DICKINSON, MICHIGAN
From 26-MAY-18 14:05:00 to 26-MAY-18 14:10:00 (CST-6)
Location: RALPH ARPT
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

There was a delayed report forwarded by the WJMN-TV meteorologist of a few golf ball sized hailstones in Ralph.  Most of the hailstones were smaller, and no damage was reported.