By late in the afternoon of the 4th, temperatures had risen into the 80s to low 90s with dew points in the low 70s. This created an extremely unstable airmass over eastern North Dakota and the northwest quarter of Minnesota. A cold front over central North Dakota marched to the east, helping to initiate severe thunderstorms across the area.

Thunderstorm Wind in CASS, NORTH DAKOTA
From 04-JUL-11 20:40:00 to 04-JUL-11 20:40:00 (CST-6)
Location: GARDNER
Magnitude: 60.00 EG
Reported by: Amateur Radio

One eight inch diameter tree and numerous tree limbs were snapped in a shelterbelt.

Hail in TOWNER, NORTH DAKOTA
From 04-JUL-11 14:30:00 to 04-JUL-11 14:30:00 (CST-6)
Location: ROCKLAKE
Magnitude: 1.00 
Reported by: Public

Penny to quarter size hail fell in Rock Lake.

Hail in CAVALIER, NORTH DAKOTA
From 04-JUL-11 15:15:00 to 04-JUL-11 15:15:00 (CST-6)
Location: MUNICH
Magnitude: 0.88 
Reported by: Public

Hail in CAVALIER, NORTH DAKOTA
From 04-JUL-11 15:20:00 to 04-JUL-11 15:20:00 (CST-6)
Location: WEAVER
Magnitude: 1.00 
Reported by: Public

Pea to quarter size hail fell.

Hail in PEMBINA, NORTH DAKOTA
From 04-JUL-11 15:55:00 to 04-JUL-11 15:55:00 (CST-6)
Location: PEMBINA
Magnitude: 1.00 
Reported by: Trained Spotter

Thunderstorm Wind in PEMBINA, NORTH DAKOTA
From 04-JUL-11 16:00:00 to 04-JUL-11 16:00:00 (CST-6)
Location: PEMBINA
Magnitude: 52.00 EG
Reported by: Trained Spotter

Tree branches up to 4 inches in diameter were blown down.

Hail in TRAILL, NORTH DAKOTA
From 04-JUL-11 19:32:00 to 04-JUL-11 19:32:00 (CST-6)
Location: REYNOLDS
Magnitude: 0.75 
Reported by: Public

Funnel Cloud in TRAILL, NORTH DAKOTA
From 04-JUL-11 20:35:00 to 04-JUL-11 20:35:00 (CST-6)
Location: CALEDONIA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in CASS, NORTH DAKOTA
From 04-JUL-11 21:30:00 to 04-JUL-11 21:30:00 (CST-6)
Location: LEONARD
Magnitude: 1.00 
Reported by: Public

Dime to quarter sized hail was reported along with brief heavy rain.

Hail in PEMBINA, NORTH DAKOTA
From 04-JUL-11 15:40:00 to 04-JUL-11 15:40:00 (CST-6)
Location: NECHE
Magnitude: 1.25 
Property damage: 10.00K
Crop damage: 50.00K
Reported by: Public

Quarter to half dollar sized hail fell. Wind drive hail produced crop, roofing, and some vehicle damage across neche township.

Tornado in PEMBINA, NORTH DAKOTA
From 04-JUL-11 15:57:00 to 04-JUL-11 16:01:00 (CST-6)
Location: PEMBINA
Tornado F-scale: EF0
Property damage: 100.00K
Reported by: NWS Storm Survey

This tornado tracked eastward for about two miles and appears to have lifted just before reaching the Red River. The tornado was likely wrapped in downburst winds and rain as it tracked across the north side of Pembina. Though wind and hail occurred over a broad area of Pembina and Pembina East townships, there was more extreme tree branch damage and evidence of a tornado track across the north side of town. Peak winds were estimated at 85 mph.

Tornado in TRAILL, NORTH DAKOTA
From 04-JUL-11 20:15:00 to 04-JUL-11 20:17:00 (CST-6)
Location: KELSO
Tornado F-scale: EF1
Property damage: 20.00K
Reported by: Trained Spotter

This tornado touched down briefly in a farmyard and tracked southward for about one-half mile before lifting. The tornado tore off part of the house eaves and numerous shingles. It also spread sections of a ground based solar collector around the farmyard. Only small branches were broken down in the poplar trees to the northeast of the farmyard. Peak winds were estimated at 95 mph.

Tornado in CASS, NORTH DAKOTA
From 04-JUL-11 20:26:00 to 04-JUL-11 20:35:00 (CST-6)
Location: GRANDIN
Tornado F-scale: EF0
Property damage: 5.00K
Crop damage: 5.00K
Reported by: Fire Department/Rescue

This tornado tracked for a distance of nearly four miles, to around four miles south-southwest of Grandin. Initially the tornado tracked southward for about 1.5 miles before turning southeast. Farm shelterbelts along the route had numerous large tree branches and tree limbs broken down. The long rope tornado was partially obscured in heavy rains at times. Peak winds were estimated at 85 mph.

Hail in CASS, NORTH DAKOTA
From 04-JUL-11 20:40:00 to 04-JUL-11 20:40:00 (CST-6)
Location: GARDNER
Magnitude: 0.88 
Reported by: Amateur Radio

Funnel Cloud in CASS, NORTH DAKOTA
From 04-JUL-11 21:05:00 to 04-JUL-11 21:07:00 (CST-6)
Location: EVEREST
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A funnel cloud was evident for a couple of minutes.

Tornado in CASS, NORTH DAKOTA
From 04-JUL-11 20:59:00 to 04-JUL-11 21:06:00 (CST-6)
Location: AMENIA
Tornado F-scale: EF2
Property damage: 150.00K
Crop damage: 150.00K
Reported by: NWS Storm Survey

This tornado tracked southeastward for nearly three miles to around three miles northwest of Mapleton. The tornado took down three sets of wooden high voltage double power poles. It continued into a farmyard and completely removed the roof from one farmhouse and blew apart the attached garage. A semi tractor and trailer in the yard were rolled. Numerous trees were snapped or uprooted and smaller sheds were destroyed. Peak winds were estimated at 130 mph.