A two round severe event developed on the afternoon of June 9 and continued into the early morning hours of June 10. The first round started in the late afternoon of June 9 as a warm front lifted through central into eastern North Dakota and a dry line/cold front dropped towards south central North Dakota. Scattered supercell thunderstorms developed from north central North Dakota into the James River Valley. These storms moved out of the area and were followed by the second round late at night, Storms  moved into southwest North Dakota from Montana and strengthened in a high shear and moderate instability environment. The strongest wind gusts estimated at 90 mph occurred near Rugby in Pierce County, while the largest hail was baseball sized, and occurred in multiple locations along and near Interstate 94 in Stark County.

Hail in FOSTER, NORTH DAKOTA
From 09-JUN-17 19:35:00 to 09-JUN-17 19:38:00 (CST-6)
Location: CARRINGTON
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in STUTSMAN, NORTH DAKOTA
From 09-JUN-17 19:38:00 to 09-JUN-17 19:40:00 (CST-6)
Location: JAMESTOWN
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in STUTSMAN, NORTH DAKOTA
From 09-JUN-17 20:01:00 to 09-JUN-17 20:03:00 (CST-6)
Location: COURTENAY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in STUTSMAN, NORTH DAKOTA
From 09-JUN-17 20:24:00 to 09-JUN-17 20:27:00 (CST-6)
Location: YPSILANTI
Magnitude: 2.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in STUTSMAN, NORTH DAKOTA
From 09-JUN-17 20:30:00 to 09-JUN-17 20:33:00 (CST-6)
Location: YPSILANTI
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in STARK, NORTH DAKOTA
From 09-JUN-17 22:40:00 to 09-JUN-17 22:44:00 (MST-7)
Location: TAYLOR
Magnitude: 1.00 
Property damage: 30.00K
Crop damage: 0.00K
Reported by: Public

Wind driven hail caused damage to the home, barns, and vehicles. Multiple windows were shattered on the home causing damage inside.

Hail in STARK, NORTH DAKOTA
From 09-JUN-17 22:45:00 to 09-JUN-17 22:48:00 (MST-7)
Location: RICHARDTON
Magnitude: 2.75 
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Public

Five windows were shattered by the hail.

Hail in STARK, NORTH DAKOTA
From 09-JUN-17 23:11:00 to 09-JUN-17 23:14:00 (MST-7)
Location: ANTELOPE
Magnitude: 2.75 
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Multiple car windshields were broken between mile marker 90 and 91 on Interstate 94.

Hail in MORTON, NORTH DAKOTA
From 10-JUN-17 00:03:00 to 10-JUN-17 00:06:00 (CST-6)
Location: HEBRON
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in MORTON, NORTH DAKOTA
From 10-JUN-17 00:06:00 to 10-JUN-17 00:10:00 (CST-6)
Location: HEBRON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in MORTON, NORTH DAKOTA
From 10-JUN-17 00:10:00 to 10-JUN-17 00:15:00 (CST-6)
Location: GLEN ULLIN
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in MORTON, NORTH DAKOTA
From 10-JUN-17 00:30:00 to 10-JUN-17 00:38:00 (CST-6)
Location: NEW SALEM
Magnitude: 2.00 
Property damage: 40.00K
Crop damage: 15.00K
Reported by: Public

The home suffered paint and window damage. The metal roof on the barn had dents. Holes were punched in corn storage bags and crop damage was reported around the area.

Hail in OLIVER, NORTH DAKOTA
From 10-JUN-17 00:40:00 to 10-JUN-17 00:43:00 (CST-6)
Location: HANNOVER
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in MORTON, NORTH DAKOTA
From 10-JUN-17 00:45:00 to 10-JUN-17 00:50:00 (CST-6)
Location: JUDSON
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Thunderstorm wind gusts to 70 mph were estimated by a National Weather Service employee.

Hail in OLIVER, NORTH DAKOTA
From 10-JUN-17 00:48:00 to 10-JUN-17 00:51:00 (CST-6)
Location: CENTER
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in OLIVER, NORTH DAKOTA
From 10-JUN-17 02:40:00 to 10-JUN-17 02:50:00 (CST-6)
Location: HANNOVER
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm wind gusts of 60 mph were estimated by a trained spotter.

Thunderstorm Wind in OLIVER, NORTH DAKOTA
From 10-JUN-17 02:40:00 to 10-JUN-17 02:45:00 (CST-6)
Location: HANNOVER
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in MCLEAN, NORTH DAKOTA
From 10-JUN-17 02:54:00 to 10-JUN-17 02:59:00 (CST-6)
Location: WASHBURN
Magnitude: 63.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in WELLS, NORTH DAKOTA
From 10-JUN-17 03:50:00 to 10-JUN-17 03:55:00 (CST-6)
Location: BOWDON
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in PIERCE, NORTH DAKOTA
From 09-JUN-17 17:37:00 to 09-JUN-17 18:00:00 (CST-6)
Location: RUGBY
Magnitude: 76.00 EG
Property damage: 75.00K
Crop damage: 0.00K
Reported by: Other Federal Agency

Very strong straight line winds occurred with a thunderstorm that moved from west of Rugby into Rugby. The strongest wind gust reported was an instantaneous, non-averaged measurement of 104 mph taken three miles west of Rugby by a research team from the National Severe Storms Laboratory, which would correlate to an estimated 87 mph 5-second average gust based upon past published research. Four miles west-northwest of Rugby a large, older barn collapsed. In Rugby, large evergreen trees were uprooted at the cemetery at the northwest end of town.

Hail in MCLEAN, NORTH DAKOTA
From 09-JUN-17 15:42:00 to 09-JUN-17 15:45:00 (CST-6)
Location: TURTLE LAKE
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in MCLEAN, NORTH DAKOTA
From 09-JUN-17 15:45:00 to 09-JUN-17 15:48:00 (CST-6)
Location: TURTLE LAKE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in SHERIDAN, NORTH DAKOTA
From 09-JUN-17 16:12:00 to 09-JUN-17 16:15:00 (CST-6)
Location: PICKARDVILLE
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in MCLEAN, NORTH DAKOTA
From 09-JUN-17 15:55:00 to 09-JUN-17 15:57:00 (CST-6)
Location: TURTLE LAKE
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in MCHENRY, NORTH DAKOTA
From 09-JUN-17 16:25:00 to 09-JUN-17 16:28:00 (CST-6)
Location: DEERING
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in SHERIDAN, NORTH DAKOTA
From 09-JUN-17 17:17:00 to 09-JUN-17 17:19:00 (CST-6)
Location: DENHOFF
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in MCHENRY, NORTH DAKOTA
From 09-JUN-17 17:27:00 to 09-JUN-17 17:30:00 (CST-6)
Location: TOWNER
Magnitude: 74.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Thunderstorm Wind in MCHENRY, NORTH DAKOTA
From 09-JUN-17 17:30:00 to 09-JUN-17 17:33:00 (CST-6)
Location: TOWNER
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Thunderstorm wind gust speed estimated by a COOP observer.

Hail in WELLS, NORTH DAKOTA
From 09-JUN-17 17:37:00 to 09-JUN-17 17:40:00 (CST-6)
Location: HURDSFIELD
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Hail in WELLS, NORTH DAKOTA
From 09-JUN-17 18:00:00 to 09-JUN-17 18:02:00 (CST-6)
Location: CHASELEY
Magnitude: 2.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in WELLS, NORTH DAKOTA
From 09-JUN-17 18:20:00 to 09-JUN-17 18:25:00 (CST-6)
Location: CHASELEY
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in FOSTER, NORTH DAKOTA
From 09-JUN-17 19:00:00 to 09-JUN-17 19:03:00 (CST-6)
Location: CARRINGTON ARPT
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Hail in FOSTER, NORTH DAKOTA
From 09-JUN-17 19:05:00 to 09-JUN-17 19:08:00 (CST-6)
Location: CARRINGTON
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in FOSTER, NORTH DAKOTA
From 09-JUN-17 19:10:00 to 09-JUN-17 19:13:00 (CST-6)
Location: CARRINGTON
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public