In the early afternoon of June 26th, Severe Thunderstorm Watch 518 was issued in anticipation of severe thunderstorms developing and intensifying along and ahead of a surface boundary across western South Dakota and central North Dakota, and ahead of a series of upper level vorticity maxima advancing northeast into North Dakota. Tornado watch 522 was then issued in the early evening and replaced eastern portions of Severe Thunderstorm Watch 518. This upgrade was due to discrete supercells developing along a warm front where enhanced ascent and strong low level wind shear coincided.
Multiple tornado and several severe thunderstorm warnings were issued. Multiple reports of large hail, several reports of severe thunderstorm wind gusts, and two confirmed tornado reports were received from the mid afternoon hours through the mid evening hours. In addition, very heavy rainfall over north central and south central North Dakota prompted the issuance of several flash flood warnings.

Hail in HETTINGER, NORTH DAKOTA
From 26-JUN-09 13:04:00 to 26-JUN-09 13:14:00 (MST-7)
Location: REGENT
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail up to the size of half dollar coins lasted ten minutes.

Hail in MCLEAN, NORTH DAKOTA
From 26-JUN-09 16:55:00 to 26-JUN-09 17:00:00 (CST-6)
Location: RIVERDALE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Very heavy rain accompanied the large hail.

Funnel Cloud in MORTON, NORTH DAKOTA
From 26-JUN-09 18:50:00 to 26-JUN-09 18:52:00 (CST-6)
Location: SWEET BRIAR
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Tornado in MCLEAN, NORTH DAKOTA
From 26-JUN-09 18:10:00 to 26-JUN-09 18:11:00 (CST-6)
Location: MERCER
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A tornado briefly touched down in open country. The tornado impacted no structures and so no damage was done.

Hail in MCLEAN, NORTH DAKOTA
From 26-JUN-09 18:25:00 to 26-JUN-09 18:30:00 (CST-6)
Location: MERCER
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in MORTON, NORTH DAKOTA
From 26-JUN-09 19:05:00 to 26-JUN-09 19:10:00 (CST-6)
Location: SWEET BRIAR
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported a strong thunderstorm wind gust.

Flash Flood in BURLEIGH, NORTH DAKOTA
From 26-JUN-09 20:00:00 to 26-JUN-09 23:00:00 (CST-6)
Location: (BIS)BISMARCK MUNI A
Flood cause: Heavy Rain
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Newspaper

One to three inches of rain fell over the Bismarck area in 45 minutes.  The heaviest rainfall occurred across northern sections of the city. This resulted in widespread street flooding and overturned manhole covers. A few homes suffered water damage to basements.

Thunderstorm Wind in MORTON, NORTH DAKOTA
From 26-JUN-09 18:10:00 to 26-JUN-09 18:15:00 (CST-6)
Location: GLEN ULLIN
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported strong thunderstorm winds and heavy rainfall.

Hail in MCLEAN, NORTH DAKOTA
From 26-JUN-09 18:20:00 to 26-JUN-09 18:24:00 (CST-6)
Location: MERCER
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in MCLEAN, NORTH DAKOTA
From 26-JUN-09 18:35:00 to 26-JUN-09 18:40:00 (CST-6)
Location: GARRISON MUNI ARPT
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported strong thunderstorm wind gusts and heavy rainfall.

Hail in MCLEAN, NORTH DAKOTA
From 26-JUN-09 18:45:00 to 26-JUN-09 18:49:00 (CST-6)
Location: MERCER
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in MCLEAN, NORTH DAKOTA
From 26-JUN-09 18:45:00 to 26-JUN-09 18:50:00 (CST-6)
Location: GARRISON
Magnitude: 61.00 EG
Property damage: 4.00K
Crop damage: 0.00K
Reported by: Public

An estimated thuderstorm wind gust of 70 mph was reported by the public. Large tree branches were broken.

Hail in MCLEAN, NORTH DAKOTA
From 26-JUN-09 18:48:00 to 26-JUN-09 18:53:00 (CST-6)
Location: TURTLE LAKE
Magnitude: 2.75 
Property damage: 45.00K
Crop damage: 0.00K
Reported by: Newspaper

Residents of rural Turtle Lake reported window damage to homes and vehicles from the large hail.

Hail in MCLEAN, NORTH DAKOTA
From 26-JUN-09 17:00:00 to 26-JUN-09 17:05:00 (CST-6)
Location: RIVERDALE
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in MCLEAN, NORTH DAKOTA
From 26-JUN-09 17:39:00 to 26-JUN-09 17:44:00 (CST-6)
Location: GARRISON
Magnitude: 55.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Thunderstorm Wind in HETTINGER, NORTH DAKOTA
From 26-JUN-09 15:15:00 to 26-JUN-09 15:20:00 (MST-7)
Location: NEW ENGLAND
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Strong thunderstorm winds were accompanied by heavy rain.

Heavy Rain in SLOPE, NORTH DAKOTA
From 26-JUN-09 14:55:00 to 26-JUN-09 15:15:00 (MST-7)
Location: AMIDON
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A thunderstorm produced 1.40 inches of rainfall in 20 minutes.

Hail in PIERCE, NORTH DAKOTA
From 26-JUN-09 16:15:00 to 26-JUN-09 16:20:00 (CST-6)
Location: SELZ
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Tornado in MCLEAN, NORTH DAKOTA
From 26-JUN-09 17:43:00 to 26-JUN-09 17:46:00 (CST-6)
Location: UNDERWOOD
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A brief tornado touchdown occurred in open country. The tornado impacted no structures and so no damage was done.

Hail in MCLEAN, NORTH DAKOTA
From 26-JUN-09 17:45:00 to 26-JUN-09 17:50:00 (CST-6)
Location: UNDERWOOD
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Hail in MCLEAN, NORTH DAKOTA
From 26-JUN-09 18:10:00 to 26-JUN-09 18:15:00 (CST-6)
Location: MERCER
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Heavy Rain in BURLEIGH, NORTH DAKOTA
From 26-JUN-09 21:22:00 to 26-JUN-09 21:22:00 (CST-6)
Location: (BIS)BISMARCK MUNI A
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A public report of 3.6 inches of rain was recieved.