During the late afternoon of Tuesday, May 10th, a line of severe thunderstorms developed along the leading edge of a strong dry line moving across southern and central Minnesota. Once the thunderstorms developed, several became super cells and produced large hail across portions of the Twin Cities metro area, then northwest along the Mississippi River valley, and north to Mille Lacs Lake. Numerous reports of golf ball size hail occurred with these storms, along with an isolated tornado near St. Michael, Minnesota.

Hail in HENNEPIN, MINNESOTA
From 10-MAY-11 19:29:00 to 10-MAY-11 19:35:00 (CST-6)
Location: MORNINGSIDE
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in WRIGHT, MINNESOTA
From 10-MAY-11 19:15:00 to 10-MAY-11 19:19:00 (CST-6)
Location: ALBERTVILLE
Magnitude: 2.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in HENNEPIN, MINNESOTA
From 10-MAY-11 19:38:00 to 10-MAY-11 19:43:00 (CST-6)
Location: MINNEAPOLIS
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail fell at the intersection of Interstates 94 and 394.

Hail in HENNEPIN, MINNESOTA
From 10-MAY-11 19:03:00 to 10-MAY-11 19:03:00 (CST-6)
Location: EDEN PRAIRIE
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail fell near Pioneer Trail and Eden Prairie Road.

Funnel Cloud in ANOKA, MINNESOTA
From 10-MAY-11 19:55:00 to 10-MAY-11 19:55:00 (CST-6)
Location: BLAINE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A funnel cloud was witnessed by a number of spotters, including one who photographed it. The funnel was high-based.

Hail in WRIGHT, MINNESOTA
From 10-MAY-11 18:36:00 to 10-MAY-11 18:39:00 (CST-6)
Location: ST MICHAEL
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in CARVER, MINNESOTA
From 10-MAY-11 18:43:00 to 10-MAY-11 18:43:00 (CST-6)
Location: CHASKA
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in WRIGHT, MINNESOTA
From 10-MAY-11 19:13:00 to 10-MAY-11 19:13:00 (CST-6)
Location: OTSEGO
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in CARVER, MINNESOTA
From 10-MAY-11 18:40:00 to 10-MAY-11 18:40:00 (CST-6)
Location: CHASKA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in WRIGHT, MINNESOTA
From 10-MAY-11 18:58:00 to 10-MAY-11 18:58:00 (CST-6)
Location: ST MICHAEL
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in CARVER, MINNESOTA
From 10-MAY-11 18:58:00 to 10-MAY-11 18:58:00 (CST-6)
Location: CHANHASSEN
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in HENNEPIN, MINNESOTA
From 10-MAY-11 19:15:00 to 10-MAY-11 19:15:00 (CST-6)
Location: HOPKINS
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MORRISON, MINNESOTA
From 10-MAY-11 17:27:00 to 10-MAY-11 17:27:00 (CST-6)
Location: BOWLUS
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in STEARNS, MINNESOTA
From 10-MAY-11 17:30:00 to 10-MAY-11 17:30:00 (CST-6)
Location: ST JOSEPH
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in STEARNS, MINNESOTA
From 10-MAY-11 17:43:00 to 10-MAY-11 17:43:00 (CST-6)
Location: ST JOSEPH
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in WRIGHT, MINNESOTA
From 10-MAY-11 18:20:00 to 10-MAY-11 18:20:00 (CST-6)
Location: BUFFALO MUNI ARPT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in HENNEPIN, MINNESOTA
From 10-MAY-11 19:25:00 to 10-MAY-11 19:25:00 (CST-6)
Location: MINNEAPOLIS
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in WASHINGTON, MINNESOTA
From 10-MAY-11 19:35:00 to 10-MAY-11 19:35:00 (CST-6)
Location: FOREST LAKE
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in ANOKA, MINNESOTA
From 10-MAY-11 20:00:00 to 10-MAY-11 20:00:00 (CST-6)
Location: ST FRANCIS
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MILLE LACS, MINNESOTA
From 10-MAY-11 20:15:00 to 10-MAY-11 20:15:00 (CST-6)
Location: PEASE
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in CARVER, MINNESOTA
From 10-MAY-11 18:48:00 to 10-MAY-11 18:48:00 (CST-6)
Location: CHANHASSEN
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Hail in ISANTI, MINNESOTA
From 10-MAY-11 21:17:00 to 10-MAY-11 21:17:00 (CST-6)
Location: BRAHAM
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in CHISAGO, MINNESOTA
From 10-MAY-11 21:50:00 to 10-MAY-11 21:50:00 (CST-6)
Location: BRANCH
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in CHISAGO, MINNESOTA
From 10-MAY-11 22:14:00 to 10-MAY-11 22:14:00 (CST-6)
Location: NORTH BRANCH
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in BENTON, MINNESOTA
From 10-MAY-11 18:50:00 to 10-MAY-11 18:50:00 (CST-6)
Location: OAK PARK
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in SHERBURNE, MINNESOTA
From 10-MAY-11 19:25:00 to 10-MAY-11 19:25:00 (CST-6)
Location: ELK RIVER
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Hail in HENNEPIN, MINNESOTA
From 10-MAY-11 18:53:00 to 10-MAY-11 18:53:00 (CST-6)
Location: CHANHASSEN
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Located near Highways 101 and 62.

Hail in BENTON, MINNESOTA
From 10-MAY-11 18:54:00 to 10-MAY-11 18:54:00 (CST-6)
Location: OAK PARK
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Hail in RICE, MINNESOTA
From 10-MAY-11 19:07:00 to 10-MAY-11 19:07:00 (CST-6)
Location: WEBSTER
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in MORRISON, MINNESOTA
From 10-MAY-11 17:38:00 to 10-MAY-11 17:38:00 (CST-6)
Location: BOWLUS
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Hail in STEARNS, MINNESOTA
From 10-MAY-11 17:44:00 to 10-MAY-11 17:44:00 (CST-6)
Location: ST JOSEPH
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in SHERBURNE, MINNESOTA
From 10-MAY-11 18:04:00 to 10-MAY-11 18:04:00 (CST-6)
Location: CLEAR LAKE
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in SHERBURNE, MINNESOTA
From 10-MAY-11 18:05:00 to 10-MAY-11 18:05:00 (CST-6)
Location: CLEAR LAKE
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in HENNEPIN, MINNESOTA
From 10-MAY-11 18:55:00 to 10-MAY-11 18:55:00 (CST-6)
Location: EDEN PRAIRIE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in HENNEPIN, MINNESOTA
From 10-MAY-11 19:10:00 to 10-MAY-11 19:10:00 (CST-6)
Location: RICHFIELD
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail fell at 46th Street and Nicollet Avenue in South Minneapolis.

Hail in HENNEPIN, MINNESOTA
From 10-MAY-11 19:30:00 to 10-MAY-11 19:35:00 (CST-6)
Location: ST LOUIS PARK
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Hail fell at Interstate 394 and Highway 100.

Hail in HENNEPIN, MINNESOTA
From 10-MAY-11 19:05:00 to 10-MAY-11 19:05:00 (CST-6)
Location: EDEN PRAIRIE
Magnitude: 2.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Hail was photographed and measured. It fell near Mitchell Road and Carmody Drive in Eden Prairie.

Hail in MILLE LACS, MINNESOTA
From 10-MAY-11 19:37:00 to 10-MAY-11 19:37:00 (CST-6)
Location: PEASE
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in HENNEPIN, MINNESOTA
From 10-MAY-11 19:10:00 to 10-MAY-11 19:15:00 (CST-6)
Location: EDINA
Magnitude: 1.90 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

There were multiple reports of golf ball size hail, as well as a 1.9 inch hailstone that was photographed and measured.

Hail in MILLE LACS, MINNESOTA
From 10-MAY-11 19:58:00 to 10-MAY-11 19:58:00 (CST-6)
Location: MILACA
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in MILLE LACS, MINNESOTA
From 10-MAY-11 20:18:00 to 10-MAY-11 20:18:00 (CST-6)
Location: MILACA
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in BENTON, MINNESOTA
From 10-MAY-11 18:13:00 to 10-MAY-11 18:13:00 (CST-6)
Location: JAKEVILLE
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in STEELE, MINNESOTA
From 10-MAY-11 18:09:00 to 10-MAY-11 18:13:00 (CST-6)
Location: ELLENDALE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MILLE LACS, MINNESOTA
From 10-MAY-11 19:30:00 to 10-MAY-11 19:40:00 (CST-6)
Location: PEASE
Magnitude: 3.20 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail began as pea size at 1925 and gradually increased to three inches in diameter by 1940. It exceeded one inch in diameter for ten minutes. Roofs and vehicles were damaged. Hail was measured and photographed.

Hail in HENNEPIN, MINNESOTA
From 10-MAY-11 19:52:00 to 10-MAY-11 19:52:00 (CST-6)
Location: MINNEAPOLIS
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Funnel Cloud in HENNEPIN, MINNESOTA
From 10-MAY-11 19:25:00 to 10-MAY-11 19:30:00 (CST-6)
Location: ST LOUIS PARK
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

There were multiple reports of a funnel cloud over southern St Louis Park. A photograph showed it to be high-based.

Hail in SCOTT, MINNESOTA
From 10-MAY-11 18:33:00 to 10-MAY-11 18:33:00 (CST-6)
Location: MERRIAM
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Hail in BENTON, MINNESOTA
From 10-MAY-11 18:35:00 to 10-MAY-11 18:35:00 (CST-6)
Location: FOLEY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Hail in WRIGHT, MINNESOTA
From 10-MAY-11 18:38:00 to 10-MAY-11 18:43:00 (CST-6)
Location: ST MICHAEL
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in HENNEPIN, MINNESOTA
From 10-MAY-11 18:56:00 to 10-MAY-11 18:56:00 (CST-6)
Location: EDEN PRAIRIE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

At Miller Park, just northwest of Highway 212 and Eden Prairie Road.

Hail in BENTON, MINNESOTA
From 10-MAY-11 18:58:00 to 10-MAY-11 18:58:00 (CST-6)
Location: RONNEBY
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Hail in SHERBURNE, MINNESOTA
From 10-MAY-11 19:00:00 to 10-MAY-11 19:10:00 (CST-6)
Location: ELK RIVER
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in HENNEPIN, MINNESOTA
From 10-MAY-11 19:03:00 to 10-MAY-11 19:08:00 (CST-6)
Location: FLYING CLOUD ARPT
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

The roof of a greenhouse was punctured.

Hail in HENNEPIN, MINNESOTA
From 10-MAY-11 19:03:00 to 10-MAY-11 19:10:00 (CST-6)
Location: EDINA
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

There were multiple reports of large hail, including near the intersection of Highways 62 and 100.

Hail in SHERBURNE, MINNESOTA
From 10-MAY-11 19:24:00 to 10-MAY-11 19:25:00 (CST-6)
Location: ZIMMERMAN
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail fell at the intersection of County Roads 1 and 32.

Hail in MILLE LACS, MINNESOTA
From 10-MAY-11 19:32:00 to 10-MAY-11 19:32:00 (CST-6)
Location: ESTES BROOK
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Hail in SHERBURNE, MINNESOTA
From 10-MAY-11 20:00:00 to 10-MAY-11 20:04:00 (CST-6)
Location: ELK RIVER
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail fell at County Road 33 and Twin Lakes Road.

Hail in HENNEPIN, MINNESOTA
From 10-MAY-11 19:28:00 to 10-MAY-11 19:35:00 (CST-6)
Location: GOLDEN VLY
Magnitude: 2.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in HENNEPIN, MINNESOTA
From 10-MAY-11 19:28:00 to 10-MAY-11 19:35:00 (CST-6)
Location: ST LOUIS PARK
Magnitude: 2.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in HENNEPIN, MINNESOTA
From 10-MAY-11 18:52:00 to 10-MAY-11 18:52:00 (CST-6)
Location: EDEN PRAIRIE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Located at Dell Road and Pioneer Trail.

Hail in BENTON, MINNESOTA
From 10-MAY-11 18:43:00 to 10-MAY-11 18:43:00 (CST-6)
Location: FOLEY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in HENNEPIN, MINNESOTA
From 10-MAY-11 19:20:00 to 10-MAY-11 19:20:00 (CST-6)
Location: EDINA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail fell on the west side of Lake Harriet, near 44th St and Vincent Ave S in Minneapolis.

Hail in BENTON, MINNESOTA
From 10-MAY-11 19:15:00 to 10-MAY-11 19:19:00 (CST-6)
Location: OAK PARK
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Hail fell along Highway 23, just northeast of Oak Park. It began as one inch hail at 1915 and increased to two inch hail by 1919.

Tornado in WRIGHT, MINNESOTA
From 10-MAY-11 18:55:00 to 10-MAY-11 19:01:00 (CST-6)
Location: HANOVER
Tornado F-scale: EF1
Property damage: 500.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

One home lost part of its roof, and others lost shingles. Several homes had windows blown in. Several dozen trees and a number of power poles were broken or knocked down. Siding and soffits were ripped off a few houses. Numerous backyard fences were blown over. A pole barn was lifted up about three feet before being set back down.  The tornado was photographed and videotaped by several people. The condensation funnel was not fully extended, and the debris cloud never extended as high as the condensation funnel. The tornado was a marginal EF-1, with winds near 90 mph.