During the early morning hours of Monday, June 22nd, a complex of thunderstorms (classified by some as a weak derecho event) developed across western South Dakota and moved rapidly eastward into southwest Minnesota before daybreak. Several bow-echo segments and a few isolated storms ahead of the main thunderstorm complex affected a large area along and south of the Minnesota River Valley, and in the southern suburbs of the Twin Cities between 4 am and 6 am LST.
Initially, a line of thunderstorms that bowed out in far southern Minnesota, caused numerous downed trees, power lines, and some structural damage to outbuildings and homes as winds of 60 to 70 mph moved across the area between 4 am and 6 am LST.
There were isolated severe storms that developed ahead of the main line and moved northeast across south central and into the southern suburbs of the Twin Cities. Golf ball size hail was reported west of Lakeville before sunrise.

Hail in SCOTT, MINNESOTA
From 22-JUN-15 05:23:00 to 22-JUN-15 05:23:00 (CST-6)
Location: ELKO NEW MARKET
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in DAKOTA, MINNESOTA
From 22-JUN-15 05:26:00 to 22-JUN-15 05:26:00 (CST-6)
Location: LAKEVILLE
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in DAKOTA, MINNESOTA
From 22-JUN-15 05:45:00 to 22-JUN-15 05:45:00 (CST-6)
Location: COATES
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in BLUE EARTH, MINNESOTA
From 22-JUN-15 05:05:00 to 22-JUN-15 05:07:00 (CST-6)
Location: VERNON CENTER
Magnitude: 61.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Numerous trees were blown down along with a roof blown off a commercial building near Vernon Center.

Thunderstorm Wind in MARTIN, MINNESOTA
From 22-JUN-15 04:55:00 to 22-JUN-15 04:57:00 (CST-6)
Location: FAIRMONT
Magnitude: 60.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Public

A tree was blown down and landed on a house in Fairmont.

Thunderstorm Wind in FREEBORN, MINNESOTA
From 22-JUN-15 05:46:00 to 22-JUN-15 05:47:00 (CST-6)
Location: ALBERT LEA
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

A tree was blown down in Albert Lea.

Hail in DAKOTA, MINNESOTA
From 22-JUN-15 05:40:00 to 22-JUN-15 05:40:00 (CST-6)
Location: ROSEMOUNT
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in WASECA, MINNESOTA
From 22-JUN-15 04:30:00 to 22-JUN-15 04:30:00 (CST-6)
Location: NEW RICHLAND
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

Thunderstorm Wind in MARTIN, MINNESOTA
From 22-JUN-15 04:45:00 to 22-JUN-15 04:47:00 (CST-6)
Location: SHERBURN
Magnitude: 56.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Broadcast Media

A tree was uprooted and fell onto a car and building causing significant damage in Sherburn.

Thunderstorm Wind in WATONWAN, MINNESOTA
From 22-JUN-15 04:50:00 to 22-JUN-15 04:52:00 (CST-6)
Location: ST JAMES
Magnitude: 52.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Amateur Radio

A large tree was blown down and landed on a house in St. James.

Hail in DAKOTA, MINNESOTA
From 22-JUN-15 05:35:00 to 22-JUN-15 05:35:00 (CST-6)
Location: FARMINGTON
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Hail in SCOTT, MINNESOTA
From 22-JUN-15 05:15:00 to 22-JUN-15 05:15:00 (CST-6)
Location: ELKO NEW MARKET
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Tornado in NICOLLET, MINNESOTA
From 22-JUN-15 05:50:00 to 22-JUN-15 05:54:00 (CST-6)
Location: OSHAWA
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

The tornado mostly crossed corn and bean fields, but it did originate near a freshly cut alfalfa field. The alfalfa was easily blown and resulted in a debris signature on radar. The tornado produced very minor damage at a few farmsteads, and knocked down several dozen trees along with breaking many large branches. The tornado was also photographed by a local resident.