Several thunderstorms developed across the western Twin Cities metro, into east central Minnesota, between 300 and 330 PM LST. One storm developed over the National Weather Service Office in Chanhassen, MN and produced large hail. There was also siding damage to homes just south of the National Weather Service Office in Chanhassen, which reported up to two inches in diameter for hail size. As this storm moved off across the southern part of the Twin Cities area, most of the hail was measured up to the size of nickels.
Another severe thunderstorm developed in the northwest part of the Twin Cities, near Brooklyn Park, where windows were blown out, and then began to move rapidly eastward across the northern and eastern Twin Cities area. Numerous reports of large hail (up to 1.25) and damaging winds were reported along the storm path from near Crystal, Robbinsdale, and Golden Valley, eastward to North Minneapolis, Columbia Heights, Saint Anthony and Arden Hills. Another swath of large hail (up to golf ball size) occurred from near White Bear Lake, eastward to Stillwater. Some of the hail was measured up to a foot deep in some areas. These storms moved quickly eastward into west central Wisconsin and produced more severe hail and damaging winds.
A secondary line of thunderstorms developed along the Minnesota, Iowa border and produced damaging winds near Albert Lea where power lines were blown down.

Hail in RAMSEY, MINNESOTA
From 03-MAY-15 16:30:00 to 03-MAY-15 16:30:00 (CST-6)
Location: LITTLE CANADA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in RAMSEY, MINNESOTA
From 03-MAY-15 16:43:00 to 03-MAY-15 16:43:00 (CST-6)
Location: GEM LAKE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in RAMSEY, MINNESOTA
From 03-MAY-15 16:30:00 to 03-MAY-15 16:32:00 (CST-6)
Location: LITTLE CANADA
Magnitude: 1.25 
Crop damage: 0.00K
Reported by: CoCoRaHS

The hail was up to five inches deep. Winds gusted up to 50 mph before the hail started. It was measured by a handheld anemometer.

Hail in CARVER, MINNESOTA
From 03-MAY-15 15:20:00 to 03-MAY-15 15:22:00 (CST-6)
Location: CHANHASSEN
Magnitude: 2.00 
Property damage: 40.00K
Crop damage: 0.00K
Reported by: Public

Two inch diameter hail was reported just south of the National Weather Service Office and produced siding damage. After a survey of the houses, approximately 5-10 homes sustained minor damage.

Hail in CARVER, MINNESOTA
From 03-MAY-15 15:18:00 to 03-MAY-15 15:18:00 (CST-6)
Location: CHANHASSEN
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Hail in WASHINGTON, MINNESOTA
From 03-MAY-15 16:45:00 to 03-MAY-15 16:45:00 (CST-6)
Location: OAK PARK HEIGHTS
Magnitude: 1.75 
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in HENNEPIN, MINNESOTA
From 03-MAY-15 16:00:00 to 03-MAY-15 16:00:00 (CST-6)
Location: OSSEO
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Windows were blown out near Osseo.

Thunderstorm Wind in HENNEPIN, MINNESOTA
From 03-MAY-15 16:25:00 to 03-MAY-15 16:27:00 (CST-6)
Location: MINNEAPOLIS
Magnitude: 52.00 MG
Crop damage: 0.00K
Reported by: Amateur Radio

A trained spotter measured a wind gust of 60 mph in north Minneapolis. There were reports just north of downtown Minneapolis of several large tree limbs blown down and a few windows blown out.

Hail in HENNEPIN, MINNESOTA
From 03-MAY-15 15:48:00 to 03-MAY-15 15:48:00 (CST-6)
Location: ROCKFORD
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in SCOTT, MINNESOTA
From 03-MAY-15 15:53:00 to 03-MAY-15 15:53:00 (CST-6)
Location: SAVAGE
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm Wind in ANOKA, MINNESOTA
From 03-MAY-15 16:35:00 to 03-MAY-15 16:35:00 (CST-6)
Location: LINO LAKES
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A large tree was blown down in Lino Lakes, just west of Marshan Lake.

Thunderstorm Wind in WASHINGTON, MINNESOTA
From 03-MAY-15 16:35:00 to 03-MAY-15 16:35:00 (CST-6)
Location: MAHTOMEDI
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A measured wind gust of 60 mph was reported by a trained spotter.

Hail in HENNEPIN, MINNESOTA
From 03-MAY-15 16:08:00 to 03-MAY-15 16:08:00 (CST-6)
Location: GOLDEN VLY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in HENNEPIN, MINNESOTA
From 03-MAY-15 16:09:00 to 03-MAY-15 16:09:00 (CST-6)
Location: ROBBINSDALE
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in HENNEPIN, MINNESOTA
From 03-MAY-15 16:08:00 to 03-MAY-15 16:08:00 (CST-6)
Location: CRYSTAL ARPT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Hail in HENNEPIN, MINNESOTA
From 03-MAY-15 16:15:00 to 03-MAY-15 16:15:00 (CST-6)
Location: ST ANTHONY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in HENNEPIN, MINNESOTA
From 03-MAY-15 16:10:00 to 03-MAY-15 16:10:00 (CST-6)
Location: ROBBINSDALE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Hail in CARVER, MINNESOTA
From 03-MAY-15 15:25:00 to 03-MAY-15 15:25:00 (CST-6)
Location: CHASKA
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in HENNEPIN, MINNESOTA
From 03-MAY-15 16:12:00 to 03-MAY-15 16:12:00 (CST-6)
Location: MINNEAPOLIS
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in HENNEPIN, MINNESOTA
From 03-MAY-15 16:15:00 to 03-MAY-15 16:15:00 (CST-6)
Location: MINNEAPOLIS
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in HENNEPIN, MINNESOTA
From 03-MAY-15 16:18:00 to 03-MAY-15 16:18:00 (CST-6)
Location: MINNEAPOLIS
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in FREEBORN, MINNESOTA
From 03-MAY-15 17:50:00 to 03-MAY-15 17:50:00 (CST-6)
Location: ALBERT LEA
Magnitude: 52.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: State Official

Several reports were received from state officials of windows blown out, trees and power lines knocked down around Albert Lea.

Hail in HENNEPIN, MINNESOTA
From 03-MAY-15 16:14:00 to 03-MAY-15 16:14:00 (CST-6)
Location: MINNEAPOLIS
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in HENNEPIN, MINNESOTA
From 03-MAY-15 16:14:00 to 03-MAY-15 16:14:00 (CST-6)
Location: BROOKLYN CENTER
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in HENNEPIN, MINNESOTA
From 03-MAY-15 16:23:00 to 03-MAY-15 16:23:00 (CST-6)
Location: MINNEAPOLIS
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in CARVER, MINNESOTA
From 03-MAY-15 15:04:00 to 03-MAY-15 15:04:00 (CST-6)
Location: HAMBURG
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Hail in HENNEPIN, MINNESOTA
From 03-MAY-15 16:25:00 to 03-MAY-15 16:25:00 (CST-6)
Location: MINNEAPOLIS
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio