Tornado Watch number 428 was in effect during this event.
An eastward moving surface cold front and upper level shortwave trough combined with strong instability and wind shear to trigger a severe weather outbreak across much of west and central North Dakota.  Storms initiated during the mid afternoon over northwest North Dakota, and continued to develop east and south through the mid evening hours.  Originally, the Tornado Watch was mainly north of Interstate 94, but was later expanded southward as severe storms moved southeast, and as thunderstorms over south central North Dakota became severe.  Very large hail, severe thunderstorm wind gusts, and very heavy rain accompanied the storms. In addition, one confirmed tornado rated EF0 briefly touched down in rural McHenry County.

Hail in DUNN, NORTH DAKOTA
From 21-JUL-13 14:57:00 to 21-JUL-13 15:04:00 (MST-7)
Location: HALLIDAY
Magnitude: 2.50 
Property damage: 105.00K
Crop damage: 0.00K
Reported by: Public

The large hail damaged vehicles and homes in the city of Halliday.

Hail in DUNN, NORTH DAKOTA
From 21-JUL-13 15:00:00 to 21-JUL-13 15:10:00 (MST-7)
Location: MARSHALL
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MORTON, NORTH DAKOTA
From 21-JUL-13 18:09:00 to 21-JUL-13 18:14:00 (CST-6)
Location: MANDAN
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in BURLEIGH, NORTH DAKOTA
From 21-JUL-13 18:15:00 to 21-JUL-13 18:20:00 (CST-6)
Location: BISMARCK
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in STARK, NORTH DAKOTA
From 21-JUL-13 15:15:00 to 21-JUL-13 15:20:00 (MST-7)
Location: RICHARDTON
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in STARK, NORTH DAKOTA
From 21-JUL-13 15:20:00 to 21-JUL-13 15:25:00 (MST-7)
Location: RICHARDTON
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in MORTON, NORTH DAKOTA
From 21-JUL-13 16:27:00 to 21-JUL-13 16:35:00 (CST-6)
Location: HEBRON
Magnitude: 2.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in MCHENRY, NORTH DAKOTA
From 21-JUL-13 17:15:00 to 21-JUL-13 17:20:00 (CST-6)
Location: TOWNER
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in PIERCE, NORTH DAKOTA
From 21-JUL-13 17:55:00 to 21-JUL-13 18:00:00 (CST-6)
Location: BALTA
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 75.00K
Reported by: Trained Spotter

The hail resulted in crop damage.

Hail in MORTON, NORTH DAKOTA
From 21-JUL-13 18:20:00 to 21-JUL-13 18:25:00 (CST-6)
Location: MANDAN
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in MORTON, NORTH DAKOTA
From 21-JUL-13 16:24:00 to 21-JUL-13 16:30:00 (CST-6)
Location: HEBRON
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Hail in MORTON, NORTH DAKOTA
From 21-JUL-13 16:45:00 to 21-JUL-13 16:55:00 (CST-6)
Location: GLEN ULLIN
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 180.00K
Reported by: Trained Spotter

The hail caused heavy damage to crops.

Thunderstorm Wind in BURLEIGH, NORTH DAKOTA
From 21-JUL-13 18:21:00 to 21-JUL-13 18:30:00 (CST-6)
Location: BISMARCK
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Heavy rain accompanied the strong winds.

Hail in BURLEIGH, NORTH DAKOTA
From 21-JUL-13 18:25:00 to 21-JUL-13 18:30:00 (CST-6)
Location: BISMARCK
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Flash Flood in MOUNTRAIL, NORTH DAKOTA
From 21-JUL-13 15:45:00 to 21-JUL-13 17:25:00 (CST-6)
Location: NEW TOWN
Flood cause: Heavy Rain
Property damage: 65.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Heavy runoff from thunderstorms resulted in a flash flood in the city of New Town. Water was a few feet deep in town and running into buildings.

Hail in MORTON, NORTH DAKOTA
From 21-JUL-13 18:28:00 to 21-JUL-13 18:33:00 (CST-6)
Location: MANDAN
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in MCKENZIE, NORTH DAKOTA
From 21-JUL-13 13:37:00 to 21-JUL-13 13:42:00 (MST-7)
Location: WATFORD CITY
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Park/Forest Service

Hail in WILLIAMS, NORTH DAKOTA
From 21-JUL-13 14:30:00 to 21-JUL-13 14:35:00 (CST-6)
Location: TIOGA
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in WILLIAMS, NORTH DAKOTA
From 21-JUL-13 14:35:00 to 21-JUL-13 14:40:00 (CST-6)
Location: RAY
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in DUNN, NORTH DAKOTA
From 21-JUL-13 14:15:00 to 21-JUL-13 14:20:00 (MST-7)
Location: MANNING
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public report of large hail.

Funnel Cloud in MCHENRY, NORTH DAKOTA
From 21-JUL-13 16:35:00 to 21-JUL-13 16:42:00 (CST-6)
Location: DEERING
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A funnel cloud was observed for several minutes. This funnel cloud eventually made contact with the ground as reported by an aircraft pilot. See the tornado entry for this same day in McHenry County.

Tornado in MCHENRY, NORTH DAKOTA
From 21-JUL-13 16:42:00 to 21-JUL-13 16:51:00 (CST-6)
Location: GRANVILLE
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Airplane Pilot

An aircraft pilot with the North Dakota Atmospheric Resource Board reported seeing a tornado, seeing evidence that it was in contact with the ground, in rural McHenry County. Doppler radar was used to narrow the more exact location. Follow up with emergency management indicated there were no reports of damage and so the tornado was rated EF0. Prior to touchdown a funnel cloud was observed for several minutes. See the funnel cloud entry for this same day in McHenry County.

Hail in DUNN, NORTH DAKOTA
From 21-JUL-13 14:25:00 to 21-JUL-13 14:30:00 (MST-7)
Location: KILLDEER
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Funnel Cloud in DUNN, NORTH DAKOTA
From 21-JUL-13 14:35:00 to 21-JUL-13 14:36:00 (MST-7)
Location: HALLIDAY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

A brief funnel cloud was observed.

Thunderstorm Wind in MOUNTRAIL, NORTH DAKOTA
From 21-JUL-13 15:20:00 to 21-JUL-13 15:30:00 (CST-6)
Location: NEW TOWN
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Large hail accompanied the strong winds.

Hail in DUNN, NORTH DAKOTA
From 21-JUL-13 14:40:00 to 21-JUL-13 14:45:00 (MST-7)
Location: WERNER
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MOUNTRAIL, NORTH DAKOTA
From 21-JUL-13 15:40:00 to 21-JUL-13 15:45:00 (CST-6)
Location: NEW TOWN
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in MCKENZIE, NORTH DAKOTA
From 21-JUL-13 13:00:00 to 21-JUL-13 13:05:00 (MST-7)
Location: ARNEGARD
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in DUNN, NORTH DAKOTA
From 21-JUL-13 14:56:00 to 21-JUL-13 15:01:00 (MST-7)
Location: HALLIDAY
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 55.00K
Reported by: Public

The large hail resulted in crop damage.

Hail in DUNN, NORTH DAKOTA
From 21-JUL-13 14:22:00 to 21-JUL-13 14:29:00 (MST-7)
Location: KILLDEER
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MOUNTRAIL, NORTH DAKOTA
From 21-JUL-13 15:14:00 to 21-JUL-13 15:29:00 (CST-6)
Location: NEW TOWN
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in MOUNTRAIL, NORTH DAKOTA
From 21-JUL-13 14:45:00 to 21-JUL-13 14:50:00 (CST-6)
Location: WHITE EARTH
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public report of large hail.