Severe Thunderstorm Watch numbers 402 and 403 were in effect during this event.
A mid level shortwave trough moving east over north central Montana was the trigger for afternoon severe convection over central and eastern Montana. Widespread thunderstorms continued to track east into western North Dakota early in the evening and maintained their intensity due to a moderately unstable air mass over North Dakota. Large hail and severe thunderstorm wind gusts accompanied this initial surge of severe storms. By the mid evening the storms congealed into an eastward moving mesoscale convective system, where it produced severe thunderstorm winds across south central North Dakota and into the James River Valley.

Hail in MCKENZIE, NORTH DAKOTA
From 08-JUL-13 16:55:00 to 08-JUL-13 17:00:00 (MST-7)
Location: FAIRVIEW
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in MCKENZIE, NORTH DAKOTA
From 08-JUL-13 16:55:00 to 08-JUL-13 17:00:00 (MST-7)
Location: FAIRVIEW
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Large hail accompanied the strong winds.

Thunderstorm Wind in GOLDEN VALLEY, NORTH DAKOTA
From 08-JUL-13 17:30:00 to 08-JUL-13 17:40:00 (MST-7)
Location: BEACH
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Very heavy rain accompanied the strong winds.

Hail in MCKENZIE, NORTH DAKOTA
From 08-JUL-13 17:15:00 to 08-JUL-13 17:20:00 (MST-7)
Location: EAST FAIRVIEW
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MCKENZIE, NORTH DAKOTA
From 08-JUL-13 17:37:00 to 08-JUL-13 17:47:00 (MST-7)
Location: WATFORD CITY
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm Wind in MCKENZIE, NORTH DAKOTA
From 08-JUL-13 17:55:00 to 08-JUL-13 18:05:00 (MST-7)
Location: GRASSY BUTTE
Magnitude: 65.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

No damage was reported with these very strong winds.

Thunderstorm Wind in BILLINGS, NORTH DAKOTA
From 08-JUL-13 18:00:00 to 08-JUL-13 18:05:00 (MST-7)
Location: FAIRFIELD
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Thunderstorm Wind in BURLEIGH, NORTH DAKOTA
From 08-JUL-13 21:40:00 to 08-JUL-13 21:50:00 (CST-6)
Location: BISMARCK
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Strong winds reduced visibilities to less than one mile along north Bismarck Expressway.

Thunderstorm Wind in FOSTER, NORTH DAKOTA
From 08-JUL-13 23:35:00 to 08-JUL-13 23:45:00 (CST-6)
Location: CARRINGTON ARPT
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Thunderstorm Wind in FOSTER, NORTH DAKOTA
From 08-JUL-13 23:44:00 to 08-JUL-13 23:51:00 (CST-6)
Location: CARRINGTON ARPT
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Thunderstorm Wind in BILLINGS, NORTH DAKOTA
From 08-JUL-13 18:00:00 to 08-JUL-13 18:10:00 (MST-7)
Location: FAIRFIELD
Magnitude: 65.00 EG
Property damage: 75.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Severe thunderstorm winds flipped over a calf shelter, blew down several power poles, and rolled hay bales through fencing.

Hail in SLOPE, NORTH DAKOTA
From 08-JUL-13 18:45:00 to 08-JUL-13 18:50:00 (MST-7)
Location: AMIDON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in DUNN, NORTH DAKOTA
From 08-JUL-13 18:50:00 to 08-JUL-13 19:00:00 (MST-7)
Location: EMERSON
Magnitude: 61.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Trained Spotter

The strong winds caused tree damage.

Thunderstorm Wind in DUNN, NORTH DAKOTA
From 08-JUL-13 19:05:00 to 08-JUL-13 19:15:00 (MST-7)
Location: HALLIDAY
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Heavy rain accompanied the strong winds.

Funnel Cloud in BILLINGS, NORTH DAKOTA
From 08-JUL-13 18:05:00 to 08-JUL-13 18:08:00 (MST-7)
Location: FAIRFIELD
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A brief funnel cloud was reported.

Thunderstorm Wind in FOSTER, NORTH DAKOTA
From 08-JUL-13 23:45:00 to 08-JUL-13 23:50:00 (CST-6)
Location: CARRINGTON
Magnitude: 56.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Strong winds blew down several trees in Carrington.

Thunderstorm Wind in DUNN, NORTH DAKOTA
From 08-JUL-13 18:35:00 to 08-JUL-13 18:45:00 (MST-7)
Location: KILLDEER
Magnitude: 74.00 EG
Property damage: 175.00K
Crop damage: 0.00K
Reported by: Trained Spotter

There were multiple reports of up to eight inch in diameter trees snapped around Killdeer.  A hanger at the Killdeer airport was destroyed, with several planes damaged or destroyed.

Thunderstorm Wind in DUNN, NORTH DAKOTA
From 08-JUL-13 18:53:00 to 08-JUL-13 19:04:00 (MST-7)
Location: HALLIDAY
Magnitude: 70.00 EG
Property damage: 80.00K
Crop damage: 0.00K
Reported by: State Official

Severe thunderstorm winds tipped over campers, took power lines down, and ripped siding from several homes in Halliday.

Thunderstorm Wind in GOLDEN VALLEY, NORTH DAKOTA
From 08-JUL-13 18:30:00 to 08-JUL-13 18:40:00 (MST-7)
Location: GOLVA
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Heavy rain accompanied the strong winds.

Thunderstorm Wind in MERCER, NORTH DAKOTA
From 08-JUL-13 20:55:00 to 08-JUL-13 20:59:00 (CST-6)
Location: STANTON
Magnitude: 56.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Tree 18 inches in diameter knocked over.

Thunderstorm Wind in MERCER, NORTH DAKOTA
From 08-JUL-13 20:55:00 to 08-JUL-13 20:59:00 (CST-6)
Location: HAZEN
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Thunderstorm Wind in MERCER, NORTH DAKOTA
From 08-JUL-13 20:56:00 to 08-JUL-13 21:05:00 (CST-6)
Location: PICK CITY
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A strong thunderstorm wind gust was reported.

Thunderstorm Wind in MERCER, NORTH DAKOTA
From 08-JUL-13 20:35:00 to 08-JUL-13 20:45:00 (CST-6)
Location: HAZEN
Magnitude: 53.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Thunderstorm Wind in MORTON, NORTH DAKOTA
From 08-JUL-13 20:25:00 to 08-JUL-13 20:35:00 (CST-6)
Location: GLEN ULLIN
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Gust front severe winds.

Thunderstorm Wind in MORTON, NORTH DAKOTA
From 08-JUL-13 20:29:00 to 08-JUL-13 20:39:00 (CST-6)
Location: HEBRON
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Gust front severe winds.

Thunderstorm Wind in MORTON, NORTH DAKOTA
From 08-JUL-13 20:30:00 to 08-JUL-13 20:40:00 (CST-6)
Location: GLEN ULLIN
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Gust front severe winds.

Thunderstorm Wind in MORTON, NORTH DAKOTA
From 08-JUL-13 20:35:00 to 08-JUL-13 20:45:00 (CST-6)
Location: HEBRON
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Gust front severe winds.

Thunderstorm Wind in MCLEAN, NORTH DAKOTA
From 08-JUL-13 21:14:00 to 08-JUL-13 21:20:00 (CST-6)
Location: GARRISON MUNI ARPT
Magnitude: 65.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Heavy rain accompanied the strong winds.

Thunderstorm Wind in MCLEAN, NORTH DAKOTA
From 08-JUL-13 21:15:00 to 08-JUL-13 21:20:00 (CST-6)
Location: GARRISON
Magnitude: 55.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS