Two waves of severe weather struck west and central North Dakota from the evening of the 29th through the early morning hours of the 30th.
The first wave of storms occurred along a surface warm front over the south and along a cool front across the north during the evening hours to just after midnight central time. Several severe thunderstorm warnings were issued, with multiple reports of large hail and strong winds received. Severe Thunderstorm Watch number 702 was in effect for this period.
The second wave of storms occurred along the cool front as it moved south into south central and southeast North Dakota, with support from a short wave trough and a strengthening low level jet. Several severe thunderstorm warnings were issued, with reports of large hail, strong winds, and heavy rain received.

Thunderstorm Wind in STUTSMAN, NORTH DAKOTA
From 29-JUL-11 23:30:00 to 29-JUL-11 23:50:00 (CST-6)
Location: WOODWORTH
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Strong winds gusted multiple times during this time period.

Thunderstorm Wind in WELLS, NORTH DAKOTA
From 29-JUL-11 23:45:00 to 29-JUL-11 23:52:00 (CST-6)
Location: HARVEY
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Strong winds were reported.

Hail in MORTON, NORTH DAKOTA
From 30-JUL-11 02:05:00 to 30-JUL-11 02:10:00 (CST-6)
Location: SWEET BRIAR
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in BURLEIGH, NORTH DAKOTA
From 30-JUL-11 03:00:00 to 30-JUL-11 03:10:00 (CST-6)
Location: STERLING
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

The strong winds lasted a few minutes.

Hail in LOGAN, NORTH DAKOTA
From 30-JUL-11 03:09:00 to 30-JUL-11 03:22:00 (CST-6)
Location: NAPOLEON
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Hail in DICKEY, NORTH DAKOTA
From 30-JUL-11 05:20:00 to 30-JUL-11 05:29:00 (CST-6)
Location: ELLENDALE
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in WARD, NORTH DAKOTA
From 30-JUL-11 02:17:00 to 30-JUL-11 02:21:00 (CST-6)
Location: MINOT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in BOWMAN, NORTH DAKOTA
From 29-JUL-11 17:50:00 to 29-JUL-11 18:00:00 (MST-7)
Location: RHAME
Magnitude: 2.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

There were no damage reports received.

Heavy Rain in BURLEIGH, NORTH DAKOTA
From 29-JUL-11 22:00:00 to 30-JUL-11 04:00:00 (CST-6)
Location: DRISCOLL
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Waves of thunderstorms moved through with a storm total rainfall measured at 3.5 inches.

Lightning in BURLEIGH, NORTH DAKOTA
From 30-JUL-11 02:00:00 to 30-JUL-11 02:00:00 (CST-6)
Location: BISMARCK
Property damage: 190.00K
Crop damage: 0.00K
Reported by: Newspaper

A lightning strike to a rural north Bismarck home caused a fire that destroyed the home several hours later.

Hail in MORTON, NORTH DAKOTA
From 30-JUL-11 02:10:00 to 30-JUL-11 02:18:00 (CST-6)
Location: SWEET BRIAR
Magnitude: 2.50 
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Public

The large hail dented cars.

Thunderstorm Wind in LA MOURE, NORTH DAKOTA
From 30-JUL-11 05:30:00 to 30-JUL-11 05:45:00 (CST-6)
Location: LA MOURE
Magnitude: 74.00 EG
Property damage: 80.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Extensive tree damage was reported in the city of Lamoure. The strong thunderstorm winds also blew the tin roof off of a building.

Flash Flood in BURLEIGH, NORTH DAKOTA
From 30-JUL-11 02:45:00 to 30-JUL-11 06:00:00 (CST-6)
Location: BISMARCK
Flood cause: Heavy Rain
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Mesonet

Multiple reports were received from across Bismarck of water up to 18 inches deep flowing over roads. Mainly the flash flooding was in low lying and poor drainage areas of the city. In some cases water washed up to the foundation of homes and into window wells. Rain amounts were around two inches.

Hail in GRANT, NORTH DAKOTA
From 29-JUL-11 07:30:00 to 29-JUL-11 07:45:00 (MST-7)
Location: ELGIN
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in SLOPE, NORTH DAKOTA
From 29-JUL-11 17:36:00 to 29-JUL-11 17:43:00 (MST-7)
Location: MARMARTH
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in SLOPE, NORTH DAKOTA
From 29-JUL-11 17:52:00 to 29-JUL-11 17:56:00 (MST-7)
Location: MARMARTH
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in GOLDEN VALLEY, NORTH DAKOTA
From 29-JUL-11 20:00:00 to 29-JUL-11 20:15:00 (MST-7)
Location: TROTTERS
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Hail in GOLDEN VALLEY, NORTH DAKOTA
From 29-JUL-11 21:12:00 to 29-JUL-11 21:17:00 (MST-7)
Location: SENTINEL BUTTE
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in GOLDEN VALLEY, NORTH DAKOTA
From 29-JUL-11 21:12:00 to 29-JUL-11 21:17:00 (MST-7)
Location: BEACH
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Large hail accompanied the strong winds.

Thunderstorm Wind in MOUNTRAIL, NORTH DAKOTA
From 29-JUL-11 21:42:00 to 29-JUL-11 21:49:00 (CST-6)
Location: STANLEY
Magnitude: 61.00 EG
Property damage: 8.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The strong winds destroyed a baseball dugout and snapped a ten inch in diameter tree.

Thunderstorm Wind in MOUNTRAIL, NORTH DAKOTA
From 29-JUL-11 21:45:00 to 29-JUL-11 21:49:00 (CST-6)
Location: PARSHALL
Magnitude: 52.00 EG
Property damage: 8.00K
Crop damage: 0.00K
Reported by: Public

The strong winds lasted a few minutes.

Hail in BURLEIGH, NORTH DAKOTA
From 29-JUL-11 22:16:00 to 29-JUL-11 22:21:00 (CST-6)
Location: BISMARCK
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in KIDDER, NORTH DAKOTA
From 29-JUL-11 23:25:00 to 29-JUL-11 23:29:00 (CST-6)
Location: TUTTLE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter