This episode began late in the evening of July 31st and continued into the early morning hours of August 1st, as severe thunderstorms from central North Dakota moved into eastern North Dakota. Many of these storms showed a bow structure, or a structure indicative of strong winds. The storms were also slow movers and several rounds of them tracked over the same area. Hope, ND, was hit by both strong winds and very heavy rainfall. Damaging wind gusts were reported from Hope all the way through northern Richland County (ND). The storms crossed the Red River and produced more wind damage across northern Wilkin County (MN).

Thunderstorm Wind in BENSON, NORTH DAKOTA
From 01-AUG-11 00:40:00 to 01-AUG-11 00:40:00 (CST-6)
Location: FT TOTTEN
Magnitude: 60.00 EG
Reported by: Other Federal Agency

Trees were uprooted in Fort Totten.

Thunderstorm Wind in BARNES, NORTH DAKOTA
From 01-AUG-11 02:04:00 to 01-AUG-11 02:04:00 (CST-6)
Location: PILLSBURY
Magnitude: 58.00 MG
Reported by: Mesonet

The wind gust was measured at a NDAWN mesonet site.

Flash Flood in GRIGGS, NORTH DAKOTA
From 01-AUG-11 08:00:00 to 01-AUG-11 10:00:00 (CST-6)
Location: COOPERSTOWN
Flood cause: Heavy Rain
Property damage: 25.00K
Crop damage: 50.00K
Reported by: NWS Storm Survey

Several sections of farmland and farm access roads were flooded across portions of Sverdrup and Broadview townships.

Flash Flood in BARNES, NORTH DAKOTA
From 01-AUG-11 08:00:00 to 01-AUG-11 10:00:00 (CST-6)
Location: PILLSBURY
Flood cause: Heavy Rain
Property damage: 25.00K
Crop damage: 50.00K
Reported by: NWS Storm Survey

Several sections of farmland and farm access roads were flooded across Ellsbury Township.

Flash Flood in STEELE, NORTH DAKOTA
From 01-AUG-11 08:00:00 to 01-AUG-11 10:00:00 (CST-6)
Location: FINLEY
Flood cause: Heavy Rain
Property damage: 25.00K
Crop damage: 50.00K
Reported by: NWS Storm Survey

State highway 32 was closed to traffic both north and south of Finley due to water overtopping the roadway. The sheriff reported that many sections of county roads were washed out.

Flood in STEELE, NORTH DAKOTA
From 01-AUG-11 09:59:00 to 03-AUG-11 09:58:00 (CST-6)
Location: FINLEY
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 20.00K
Reported by: NWS Storm Survey

Overland flooding continued around Finley after 3 to 6 inches of rain fell.

Thunderstorm Wind in NELSON, NORTH DAKOTA
From 01-AUG-11 00:45:00 to 01-AUG-11 00:45:00 (CST-6)
Location: LAKOTA
Magnitude: 60.00 EG
Reported by: Trained Spotter

A flag pole and tree branches were blown down. The thunderstorms also dropped 1.50 inches of rain.

Thunderstorm Wind in STEELE, NORTH DAKOTA
From 01-AUG-11 01:35:00 to 01-AUG-11 01:35:00 (CST-6)
Location: HOPE
Magnitude: 91.00 EG
Reported by: Broadcast Media

More than 20 to 25 trees were uprooted in Hope. Three trees landed on cars and two trees landed on homes. The grain elevator was also damaged.

Thunderstorm Wind in GRIGGS, NORTH DAKOTA
From 01-AUG-11 01:35:00 to 01-AUG-11 01:35:00 (CST-6)
Location: COOPERSTOWN
Magnitude: 50.00 MG
Reported by: AWOS

The wind gust was measured at the Cooperstown airport.

Thunderstorm Wind in STEELE, NORTH DAKOTA
From 01-AUG-11 02:00:00 to 01-AUG-11 02:00:00 (CST-6)
Location: HOPE
Magnitude: 90.00 EG
Reported by: Law Enforcement

A grain bin was damaged near Hope.

Thunderstorm Wind in CASS, NORTH DAKOTA
From 01-AUG-11 02:25:00 to 01-AUG-11 02:25:00 (CST-6)
Location: ARTHUR
Magnitude: 55.00 EG
Reported by: COOP Observer

Numerous 6 to 10 inch diameter tree branches were blown down.

Thunderstorm Wind in TRAILL, NORTH DAKOTA
From 01-AUG-11 02:05:00 to 01-AUG-11 02:05:00 (CST-6)
Location: GALESBURG
Magnitude: 70.00 EG
Reported by: Broadcast Media

Strong winds damaged a farmstead at Galesburg. A large steel gas tank was blown off its moorings.

Thunderstorm Wind in CASS, NORTH DAKOTA
From 01-AUG-11 03:00:00 to 01-AUG-11 03:00:00 (CST-6)
Location: HORACE
Magnitude: 50.00 EG
Reported by: Broadcast Media

A large tree was split in two from strong winds.

Thunderstorm Wind in STEELE, NORTH DAKOTA
From 01-AUG-11 01:15:00 to 01-AUG-11 01:15:00 (CST-6)
Location: SHARON
Magnitude: 65.00 EG
Reported by: Broadcast Media

Several trees in a shelterbelt were blown down.

Thunderstorm Wind in RICHLAND, NORTH DAKOTA
From 01-AUG-11 03:20:00 to 01-AUG-11 03:20:00 (CST-6)
Location: CHRISTINE
Magnitude: 55.00 EG
Reported by: Public

Many large tree branches were blown down by the strong wind. Crops were also flattened by the wind and rain.

Flash Flood in STEELE, NORTH DAKOTA
From 01-AUG-11 08:00:00 to 01-AUG-11 10:00:00 (CST-6)
Location: HOPE
Flood cause: Heavy Rain
Property damage: 25.00K
Crop damage: 50.00K
Reported by: Law Enforcement

Three to six inches of rain fell over the Hope area, causing street and basement flooding. Numerous county and local township roads were flooded across Willow Lake and Carpenter townships.

Flash Flood in CASS, NORTH DAKOTA
From 01-AUG-11 08:00:00 to 01-AUG-11 10:00:00 (CST-6)
Location: PAGE
Flood cause: Heavy Rain
Property damage: 25.00K
Crop damage: 50.00K
Reported by: NWS Storm Survey

Several sections of farmland and farm access roads were flooded across Rochester Township.

Flood in STEELE, NORTH DAKOTA
From 01-AUG-11 09:59:00 to 03-AUG-11 09:58:00 (CST-6)
Location: HOPE
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 20.00K
Reported by: Law Enforcement

After the 3 to 6 inches of rain fell over the Hope area, overland flooding kept numerous roads closed.

Flood in CASS, NORTH DAKOTA
From 01-AUG-11 09:59:00 to 03-AUG-11 09:58:00 (CST-6)
Location: PAGE
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 20.00K
Reported by: NWS Storm Survey

Overland flooding continued northwest of Page after 3 to 6 inches of rain fell.

Flood in BARNES, NORTH DAKOTA
From 01-AUG-11 09:59:00 to 03-AUG-11 09:58:00 (CST-6)
Location: PILLSBURY
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 20.00K
Reported by: NWS Storm Survey

Overland flooding continued near Pillsbury after three to six inches of rain fell.

Flood in GRIGGS, NORTH DAKOTA
From 01-AUG-11 09:59:00 to 03-AUG-11 09:58:00 (CST-6)
Location: COOPERSTOWN
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 20.00K
Reported by: NWS Storm Survey

Overland flooding continued east and southeast of Cooperstown after 3 to 6 inches of rain fell.

Thunderstorm Wind in CASS, NORTH DAKOTA
From 01-AUG-11 02:15:00 to 01-AUG-11 02:15:00 (CST-6)
Location: ERIE
Magnitude: 50.00 MG
Reported by: Mesonet

The wind gust was measured at a NDAWN mesonet site.