Eastern North Dakota remained in a very weak surface pattern on the 18th, with numerous weak surface lows and boundaries across the midwest. Like the past several days, moisture levels remained very high, with surface dew points in the low to mid 60s. Some morning cloud cover along the North Dakota/South Dakota border lifted north by afternoon, and allowed a period of good heating. Although the upper level winds were fairly light, another in a series of upper level disturbances shifted over the area by mid afternoon. This helped initiate thunderstorm development over southeast North Dakota and west central Minnesota. A cluster of thunderstorms also developed over extreme northeast North Dakota. By late afternoon, a line of thunderstorms raced across the Mooreton (ND) area, through Wahpeton/Breckenridge, and into the Fergus Falls (MN) area. This line of storms brought many reports of strong winds. The weak wind flow and moist atmosphere once again brought heavy rainfall to areas along the Canadian border and areas along and south of Interstate 94.

Thunderstorm Wind in OTTER TAIL, MINNESOTA
From 18-JUN-09 17:50:00 to 18-JUN-09 17:50:00 (CST-6)
Location: FERGUS FALLS
Magnitude: 56.00 EG
Reported by: Newspaper

Several trees were blown over in town.

Thunderstorm Wind in OTTER TAIL, MINNESOTA
From 18-JUN-09 18:00:00 to 18-JUN-09 18:00:00 (CST-6)
Location: DALTON
Magnitude: 52.00 EG
Reported by: Newspaper

Several large four to six inch diameter tree branches were blown down around town.

Tornado in OTTER TAIL, MINNESOTA
From 18-JUN-09 18:15:00 to 18-JUN-09 18:17:00 (CST-6)
Location: DENT
Tornado F-scale: EF1
Reported by: Public

A tornado touched down briefly near Dent, knocking down several large trees and riping the roof off the dugout at the baseball field. The tornado tracked for about a mile and peak winds were estimated at 90 mph. Downburst winds produced additional wind damage around the Big McDonald and Star Lake areas.

Thunderstorm Wind in WADENA, MINNESOTA
From 18-JUN-09 19:10:00 to 18-JUN-09 19:10:00 (CST-6)
Location: NIMROD
Magnitude: 52.00 EG
Reported by: COOP Observer

Several four to six inch diameter tree branches were blown down.

Flash Flood in WILKIN, MINNESOTA
From 18-JUN-09 19:57:00 to 19-JUN-09 08:30:00 (CST-6)
Location: MC CAULEYVILLE
Flood cause: Heavy Rain
Property damage: 5.00K
Crop damage: 50.00K
Reported by: NWS Storm Survey

Several fields and farm access roads were flooded in McCauleyville and Nordick townships. The U.S. Highway 75 bridge over Whiskey Creek closed with water running level with the bridge deck. The highway was also closed at the railroad bridge underpass due to long term flooding issues.

Funnel Cloud in OTTER TAIL, MINNESOTA
From 18-JUN-09 18:30:00 to 18-JUN-09 18:30:00 (CST-6)
Location: LUCE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

A persistent wall cloud with a weak funnel was noted.

Hail in GRANT, MINNESOTA
From 18-JUN-09 18:20:00 to 18-JUN-09 18:20:00 (CST-6)
Location: ELBOW LAKE
Magnitude: 1.00 
Reported by: Law Enforcement

Thunderstorm Wind in OTTER TAIL, MINNESOTA
From 18-JUN-09 18:50:00 to 18-JUN-09 18:50:00 (CST-6)
Location: DEER CREEK
Magnitude: 52.00 EG
Reported by: Trained Spotter

Several four to six inch diameter tree branches were blown down around town.

Thunderstorm Wind in WADENA, MINNESOTA
From 18-JUN-09 19:02:00 to 18-JUN-09 19:07:00 (CST-6)
Location: WADENA ARPT
Magnitude: 56.00 EG
Reported by: Public

Several six to eight inch diameter tree branches were blown down.

Thunderstorm Wind in OTTER TAIL, MINNESOTA
From 18-JUN-09 18:50:00 to 18-JUN-09 18:50:00 (CST-6)
Location: DEER CREEK
Magnitude: 61.00 EG
Reported by: Trained Spotter

A large tree was blown down a mile north of Deer Creek.

Tornado in OTTER TAIL, MINNESOTA
From 18-JUN-09 17:50:00 to 18-JUN-09 17:57:00 (CST-6)
Location: CARLISLE
Tornado F-scale: EF0
Reported by: Law Enforcement

Peak winds were estimated at 80 mph.

Funnel Cloud in OTTER TAIL, MINNESOTA
From 18-JUN-09 18:43:00 to 18-JUN-09 18:43:00 (CST-6)
Location: RICHDALE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A funnel cloud was viewed over Big Pine Lake moving east.

Funnel Cloud in ROSEAU, MINNESOTA
From 18-JUN-09 16:45:00 to 18-JUN-09 16:45:00 (CST-6)
Location: SWIFT
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A funnel cloud was reported south of Warroad.

Hail in GRANT, MINNESOTA
From 18-JUN-09 18:10:00 to 18-JUN-09 18:10:00 (CST-6)
Location: HERMAN MUNI ARPT
Magnitude: 0.88 
Reported by: Public

Thunderstorm Wind in WILKIN, MINNESOTA
From 18-JUN-09 17:29:00 to 18-JUN-09 17:29:00 (CST-6)
Location: TENNEY
Magnitude: 50.00 MG
Reported by: Mesonet

The wind gust was measured at the MNDOT RWIS site near Tenney on highway 75.

Thunderstorm Wind in OTTER TAIL, MINNESOTA
From 18-JUN-09 17:48:00 to 18-JUN-09 17:48:00 (CST-6)
Location: CARLISLE
Magnitude: 70.00 EG
Reported by: Law Enforcement

Two semi trucks were blown over on Interstate 94 between the Rothsay and Fergus Falls exits.

Hail in OTTER TAIL, MINNESOTA
From 18-JUN-09 12:40:00 to 18-JUN-09 12:40:00 (CST-6)
Location: URBANK
Magnitude: 2.50 
Reported by: Public

Significant tree damage was reported.

Thunderstorm Wind in OTTER TAIL, MINNESOTA
From 18-JUN-09 17:45:00 to 18-JUN-09 17:45:00 (CST-6)
Location: (FFM)FERGUS FALLS AR
Magnitude: 69.00 MG
Reported by: Storm Chaser

The wind gust was measured by a storm chaser.

Thunderstorm Wind in WILKIN, MINNESOTA
From 18-JUN-09 17:10:00 to 18-JUN-09 17:10:00 (CST-6)
Location: EVERDELL
Magnitude: 52.00 EG
Reported by: Trained Spotter

A gustnado was observed in the thunderstorm outflow well ahead of an approaching shelf cloud.

Thunderstorm Wind in OTTER TAIL, MINNESOTA
From 18-JUN-09 17:55:00 to 18-JUN-09 17:55:00 (CST-6)
Location: FERGUS FALLS
Magnitude: 70.00 EG
Property damage: 50.00K
Reported by: Law Enforcement

A semi tractor and trailer were blown off Interstate 94 near the Dalton exit.

Thunderstorm Wind in WILKIN, MINNESOTA
From 18-JUN-09 17:15:00 to 18-JUN-09 17:15:00 (CST-6)
Location: BRECKENRIDGE
Magnitude: 56.00 EG
Reported by: NWS Storm Survey

Several large four to six inch diameter tree branches were blown down.