The last night of the unusual prolonged heat wave brought another round of severe thunderstorms. Surface dew point temperatures continued in the oppressive 70F to 80F range. With the extreme heat, mid level temperatures also remained quite warm. However, the combination of a subtle upper level disturbance and a modest low level jet helped spawn the thunderstorms.

Hail in RAMSEY, NORTH DAKOTA
From 20-JUL-11 04:40:00 to 20-JUL-11 04:40:00 (CST-6)
Location: LAWTON
Magnitude: 1.25 
Reported by: Public

Thunderstorm Wind in WALSH, NORTH DAKOTA
From 20-JUL-11 05:59:00 to 20-JUL-11 05:59:00 (CST-6)
Location: HERRICK
Magnitude: 55.00 EG
Reported by: NWS Storm Survey

A tree was snapped in a shelterbelt along Interstate 29.

Thunderstorm Wind in BENSON, NORTH DAKOTA
From 20-JUL-11 06:05:00 to 20-JUL-11 06:05:00 (CST-6)
Location: BAKER
Magnitude: 50.00 EG
Reported by: Public

Five to ten inch diameter tree branches were blown down.

Thunderstorm Wind in PEMBINA, NORTH DAKOTA
From 20-JUL-11 05:59:00 to 20-JUL-11 05:59:00 (CST-6)
Location: DRAYTON
Magnitude: 55.00 EG
Reported by: NWS Storm Survey

A tree was snapped and a wooden roadside sign was broken down.

Thunderstorm Wind in TOWNER, NORTH DAKOTA
From 20-JUL-11 06:45:00 to 20-JUL-11 06:45:00 (CST-6)
Location: MAZA
Magnitude: 50.00 EG
Reported by: Public

A few large branches were blown down.

Thunderstorm Wind in RAMSEY, NORTH DAKOTA
From 20-JUL-11 06:58:00 to 20-JUL-11 06:58:00 (CST-6)
Location: HAMPDEN
Magnitude: 50.00 EG
Reported by: Public

Several large three to five inch diameter tree branches were broken down at a farmstead. Power lines were also blown down.

Thunderstorm Wind in WALSH, NORTH DAKOTA
From 20-JUL-11 07:55:00 to 20-JUL-11 07:55:00 (CST-6)
Location: VESELEYVILLE
Magnitude: 60.00 EG
Reported by: Newspaper

Corn fields were flattened by winds.

Thunderstorm Wind in WALSH, NORTH DAKOTA
From 20-JUL-11 05:58:00 to 20-JUL-11 05:58:00 (CST-6)
Location: OAKWOOD
Magnitude: 51.00 MG
Reported by: Mesonet

The wind gust was measured by the Grafton NDAWN.

Thunderstorm Wind in BENSON, NORTH DAKOTA
From 20-JUL-11 06:25:00 to 20-JUL-11 06:25:00 (CST-6)
Location: LEEDS
Magnitude: 47.00 MS
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Mesonet

A NOAA wind profiler at Leeds measured the 2 minute average sustained wind speed.

Thunderstorm Wind in TOWNER, NORTH DAKOTA
From 20-JUL-11 03:50:00 to 20-JUL-11 03:50:00 (CST-6)
Location: CANDO
Magnitude: 60.00 EG
Reported by: Public

A large tree fell on a house.

Hail in RAMSEY, NORTH DAKOTA
From 20-JUL-11 04:00:00 to 20-JUL-11 04:00:00 (CST-6)
Location: GARSKE
Magnitude: 1.00 
Reported by: COOP Observer

An observer also measured 1.51 inches of rain.

Thunderstorm Wind in GRAND FORKS, NORTH DAKOTA
From 20-JUL-11 05:20:00 to 20-JUL-11 05:20:00 (CST-6)
Location: FOREST RIVER COLONY
Magnitude: 60.00 EG
Reported by: Emergency Manager

A tree fell on a pickup truck with no reported injuries. The time was estimated based on radar imagery.

Thunderstorm Wind in WALSH, NORTH DAKOTA
From 20-JUL-11 05:35:00 to 20-JUL-11 05:35:00 (CST-6)
Location: FOREST RIVER
Magnitude: 60.00 EG
Reported by: Emergency Manager

Large trees were blown over in Forest River.

Thunderstorm Wind in WALSH, NORTH DAKOTA
From 20-JUL-11 05:45:00 to 20-JUL-11 05:45:00 (CST-6)
Location: GRAFTON
Magnitude: 60.00 EG
Reported by: Emergency Manager

A group of power poles was blown over.

Lightning in WALSH, NORTH DAKOTA
From 20-JUL-11 06:00:00 to 20-JUL-11 06:00:00 (CST-6)
Location: GRAFTON
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A lightning strike was presumed to have been the source of a house fire. The time was estimated.

Thunderstorm Wind in PEMBINA, NORTH DAKOTA
From 20-JUL-11 06:00:00 to 20-JUL-11 06:00:00 (CST-6)
Location: DRAYTON
Magnitude: 65.00 EG
Reported by: Public

A 60 foot tall pine tree was uprooted and a 1 foot diameter oak tree was snapped off. Shingle damage also occurred.

Thunderstorm Wind in CAVALIER, NORTH DAKOTA
From 20-JUL-11 07:35:00 to 20-JUL-11 07:35:00 (CST-6)
Location: MILTON
Magnitude: 52.00 MG
Reported by: Trained Spotter

Hail in WALSH, NORTH DAKOTA
From 20-JUL-11 03:15:00 to 20-JUL-11 03:15:00 (CST-6)
Location: LANKIN
Magnitude: 1.00 
Reported by: Public

Hail fell in various sizes, with one inch diameter being the largest.

Hail in PEMBINA, NORTH DAKOTA
From 20-JUL-11 04:55:00 to 20-JUL-11 04:55:00 (CST-6)
Location: ST THOMAS
Magnitude: 1.75 
Reported by: Public

Hail fell in various sizes from dimes to golf balls.

Thunderstorm Wind in WALSH, NORTH DAKOTA
From 20-JUL-11 05:20:00 to 20-JUL-11 05:20:00 (CST-6)
Location: FORDVILLE
Magnitude: 60.00 EG
Reported by: Emergency Manager

Large trees were blown down in Fordville. The time was estimated.

Thunderstorm Wind in WALSH, NORTH DAKOTA
From 20-JUL-11 05:40:00 to 20-JUL-11 05:40:00 (CST-6)
Location: VESELEYVILLE
Magnitude: 60.00 EG
Reported by: Emergency Manager

Power poles were blown down at the intersection of North Dakota 18 and Walsh 15. The time was estimated.

Thunderstorm Wind in BENSON, NORTH DAKOTA
From 20-JUL-11 05:50:00 to 20-JUL-11 05:50:00 (CST-6)
Location: PLEASANT LAKE
Magnitude: 60.00 EG
Reported by: Public

A steel pole barn was destroyed.

Thunderstorm Wind in WALSH, NORTH DAKOTA
From 20-JUL-11 05:58:00 to 20-JUL-11 05:58:00 (CST-6)
Location: OAKWOOD
Magnitude: 50.00 EG
Reported by: Public

Several tree branches were blown down.

Thunderstorm Wind in BENSON, NORTH DAKOTA
From 20-JUL-11 05:55:00 to 20-JUL-11 05:55:00 (CST-6)
Location: KNOX
Magnitude: 60.00 EG
Reported by: Public

Several large tree limbs were broken down and a few tall evergreen trees were snapped around Knox. The grain elevator doors were also blown off.