Storms developed along a stationary boundary. One supercell storm produced large hail before a line of storms formed and brought damaging winds and heavy rain.

Hail in CASS, MINNESOTA
From 14-SEP-18 18:48:00 to 14-SEP-18 18:49:00 (CST-6)
Location: LAKE SHR
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in CROW WING, MINNESOTA
From 14-SEP-18 18:55:00 to 14-SEP-18 18:56:00 (CST-6)
Location: NISSWA
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in CROW WING, MINNESOTA
From 14-SEP-18 19:29:00 to 14-SEP-18 19:30:00 (CST-6)
Location: IRONTON
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in CROW WING, MINNESOTA
From 14-SEP-18 19:25:00 to 14-SEP-18 19:35:00 (CST-6)
Location: CROSBY
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in AITKIN, MINNESOTA
From 14-SEP-18 19:45:00 to 14-SEP-18 19:46:00 (CST-6)
Location: BENNETTVILLE
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in ST. LOUIS, MINNESOTA
From 14-SEP-18 23:50:00 to 14-SEP-18 23:51:00 (CST-6)
Location: SILICA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Hail in ST. LOUIS, MINNESOTA
From 15-SEP-18 00:32:00 to 15-SEP-18 00:33:00 (CST-6)
Location: ISLAND LAKE
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in ST. LOUIS, MINNESOTA
From 14-SEP-18 01:11:00 to 14-SEP-18 01:12:00 (CST-6)
Location: SMITHVILLE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Multiple trees were blown down along the Willard Munger State Trail.

Thunderstorm Wind in CROW WING, MINNESOTA
From 14-SEP-18 19:01:00 to 14-SEP-18 19:02:00 (CST-6)
Location: MERRIFIELD
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A birch tree 25 inches in diameter was blown over.

Thunderstorm Wind in CARLTON, MINNESOTA
From 15-SEP-18 01:00:00 to 15-SEP-18 01:01:00 (CST-6)
Location: HARNEY
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A downed tree was partially blocking Harney Road.

Thunderstorm Wind in ST. LOUIS, MINNESOTA
From 15-SEP-18 01:05:00 to 15-SEP-18 01:06:00 (CST-6)
Location: PROCTOR
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A tree snapped by the wind landed on a garage while another tree was uprooted in the adjacent yard.

Thunderstorm Wind in AITKIN, MINNESOTA
From 14-SEP-18 20:28:00 to 14-SEP-18 20:29:00 (CST-6)
Location: GLEN
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A tree was blown down across State Highway 47 at mile marker 110.

Thunderstorm Wind in CARLTON, MINNESOTA
From 15-SEP-18 01:02:00 to 15-SEP-18 01:03:00 (CST-6)
Location: ESKO
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A tree that was blown down partially blocked Palkie Road.

Thunderstorm Wind in ST. LOUIS, MINNESOTA
From 15-SEP-18 01:06:00 to 15-SEP-18 01:07:00 (CST-6)
Location: SMITHVILLE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

A large pine tree was snapped in half by the thunderstorm winds.

Thunderstorm Wind in ST. LOUIS, MINNESOTA
From 15-SEP-18 01:05:00 to 15-SEP-18 01:06:00 (CST-6)
Location: PROCTOR
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A 40 foot tall tree was snapped in half.  Many smaller trees were also damaged or blown down by the thunderstorm winds.

Thunderstorm Wind in ST. LOUIS, MINNESOTA
From 15-SEP-18 01:09:00 to 15-SEP-18 01:10:00 (CST-6)
Location: NEW DULUTH
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

A 12 inch diameter pine tree was snapped off 6 feet above the ground by the thunderstorm winds.

Thunderstorm Wind in ST. LOUIS, MINNESOTA
From 15-SEP-18 01:09:00 to 15-SEP-18 01:10:00 (CST-6)
Location: SMITHVILLE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

An 18 inch diameter willow tree showing some evidence of decay was snapped off 8 feet above the ground.

Flash Flood in CARLTON, MINNESOTA
From 15-SEP-18 08:53:00 to 15-SEP-18 10:30:00 (CST-6)
Location: CLOQUET
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Storm sewer manhole covers were flipped over. Standing water was also reported in town.