Several supercell thunderstorms formed in eastern Montana and moved into northwest North Dakota late in the afternoon. Storms initially produced large hail and heavy rain. Early in the evening, reports of rotating wall clouds and possible funnel clouds were received from various locations in McKenzie County. A confirmed EF2 tornado touched down six miles south of Watford City, and resulted in extensive damage to an RV park that was serving as a semi-permanent housing facility. Storms then transitioned into a linear convective system before weakening across Dunn County.

Hail in WILLIAMS, NORTH DAKOTA
From 26-MAY-14 16:54:00 to 26-MAY-14 16:59:00 (CST-6)
Location: BUFORD
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in WILLIAMS, NORTH DAKOTA
From 26-MAY-14 17:26:00 to 26-MAY-14 17:30:00 (CST-6)
Location: ZAHL
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in WILLIAMS, NORTH DAKOTA
From 26-MAY-14 17:32:00 to 26-MAY-14 17:36:00 (CST-6)
Location: ZAHL
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in MCKENZIE, NORTH DAKOTA
From 26-MAY-14 17:15:00 to 26-MAY-14 17:20:00 (MST-7)
Location: ARNEGARD
Magnitude: 2.25 
Property damage: 30.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A McKenzie County Deputy Sheriff reported between golf ball and baseball size hail with damage in the area.

Hail in MCKENZIE, NORTH DAKOTA
From 26-MAY-14 17:17:00 to 26-MAY-14 17:22:00 (MST-7)
Location: WATFORD CITY
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in MCKENZIE, NORTH DAKOTA
From 26-MAY-14 19:33:00 to 26-MAY-14 19:43:00 (MST-7)
Location: GRASSY BUTTE
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Hail in MCKENZIE, NORTH DAKOTA
From 26-MAY-14 17:40:00 to 26-MAY-14 17:45:00 (MST-7)
Location: ALEXANDER
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in DUNN, NORTH DAKOTA
From 26-MAY-14 20:10:00 to 26-MAY-14 20:20:00 (MST-7)
Location: MANNING
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in DUNN, NORTH DAKOTA
From 26-MAY-14 19:30:00 to 26-MAY-14 19:35:00 (MST-7)
Location: KILLDEER
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in MCKENZIE, NORTH DAKOTA
From 26-MAY-14 18:20:00 to 26-MAY-14 18:25:00 (MST-7)
Location: WATFORD CITY
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in MCKENZIE, NORTH DAKOTA
From 26-MAY-14 19:15:00 to 26-MAY-14 19:20:00 (MST-7)
Location: GRASSY BUTTE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Tornado in MCKENZIE, NORTH DAKOTA
From 26-MAY-14 17:46:00 to 26-MAY-14 17:56:00 (MST-7)
Location: WATFORD CITY
Tornado F-scale: EF2
Property damage: 2.50M
Crop damage: 0.00K
Reported by: NWS Storm Survey

Thirteen campers, serving as homes, were completely destroyed and two more were damaged by this tornado.  Other damage included a snapped wooden power line pole, automobiles, and fences, both wooden and metal. One automobile was tossed sixty feet and flipped onto its roof, with a trailer parked next to its initial location also flipped and completely destroyed. About a dozen other vehicles were damage, some destroyed. Eye witness reports indicated two other funnel clouds in the immediate area.
Of all the damage surveyed by the National Weather Service the absolute worst corresponded to EF2 on the Enhanced Fujita Scale. From that it was determined that the peak wind speeds in the tornado were on the order of 120 mph.
There were nine direct injuries.

Hail in DIVIDE, NORTH DAKOTA
From 26-MAY-14 15:38:00 to 26-MAY-14 15:44:00 (CST-6)
Location: WESTBY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in WILLIAMS, NORTH DAKOTA
From 26-MAY-14 16:30:00 to 26-MAY-14 16:35:00 (CST-6)
Location: BUFORD
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in WILLIAMS, NORTH DAKOTA
From 26-MAY-14 16:43:00 to 26-MAY-14 16:48:00 (CST-6)
Location: TRENTON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in WILLIAMS, NORTH DAKOTA
From 26-MAY-14 16:30:00 to 26-MAY-14 16:35:00 (CST-6)
Location: BUFORD
Magnitude: 2.50 
Property damage: 50.00K
Crop damage: 25.00K
Reported by: Public

Damage was reported to vehicles, roofs, and crops.

Hail in WILLIAMS, NORTH DAKOTA
From 26-MAY-14 16:52:00 to 26-MAY-14 16:57:00 (CST-6)
Location: TRENTON
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MCKENZIE, NORTH DAKOTA
From 26-MAY-14 16:24:00 to 26-MAY-14 16:33:00 (MST-7)
Location: CHARBONNEAU
Magnitude: 1.75 
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Most of the hail that fell was pea size, with the largest golf ball size. There was some damage.

Hail in MCKENZIE, NORTH DAKOTA
From 26-MAY-14 17:39:00 to 26-MAY-14 17:44:00 (MST-7)
Location: ALEXANDER
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in WILLIAMS, NORTH DAKOTA
From 26-MAY-14 17:05:00 to 26-MAY-14 17:10:00 (CST-6)
Location: ALAMO
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public