Storm Events Database

Storm Events Database

Event Details

Event Tornado
-- Scale EF2
-- Length 11.98
-- Width 50
State NORTH DAKOTA
County/Area LOGAN
WFO BIS
Begin Date 07/10/2011 13:40:00 CST-6
Begin Range 7
Begin Azimuth S
Begin Location NAPOLEON
Begin Lat/Lon 46.4/-99.79
End Date 07/10/2011 13:59:00 CST-6
End Range 4
End Azimuth E
End Location BURNSTAD
End Lat/Lon 46.38/-99.54
Deaths Direct/Indirect 0/0 (fatality details below, when available...)
Injuries Direct/Indirect 0/0
Property Damage 450.00K
Crop Damage 0.00K
Episode Narrative A strong upper level jet streak moving into the region triggered scattered elevated thunderstorm activity during the late morning hours of July 10th over southwest North Dakota. Large hail up to two inches in diameter was reported with these storms. As the aerial coverage of storms became more widespread, Severe Thunderstorm Watch number 616 was issued. Once the storms advected to the east into south central and southeast North Dakota during the afternoon, they became rooted in the boundary layer and became much more intense necessitating the issuance of Tornado Watch number 617. Considerable veering winds with height, strong instability, and favorable deep layer sheer produced a favorable environment for very large hail, damaging winds, and isolated tornadoes.

Multiple severe thunderstorm warnings and several tornado warnings were issued during this event. Numerous reports of large hail and destructive thunderstorm winds were received. After in depth investigation including two separate storm damage surveys, it was concluded that four confirmed tornadoes occurred during this event, including EF2 tornado damage seven miles south of Napoleon.
Event Narrative A National Weather Service storm survey confirmed that an EF2 tornado on the Enhanced Fujita Scale touched down around seven miles south southwest of Napoleon, then moved east southeast before lifting four miles east of Burnstad. No fewer than three farmsteads were damaged along the path of the tornado. The worst damage occurred seven miles south southwest of Napoleon, where the tornado picked up and threw an 18 thousand bushel grain bin 250 yards, and also destroyed 1,800 feet of shelter belt trees near 100 feet tall. East southeast of this farmstead, the tornado lifted and rolled a ten ton grain bin three quarters of one mile to another farmstead, where it impacted and damaged a barn. The damage corresponded to EF2 on the Enhanced Fujita Scale. From that it was determined that wind speeds with this tornado were around 120 miles per hour.


All events for this episode:

Location County/Zone St. Date Time T.Z. Type Mag Dth Inj PrD CrD
Totals: 0 0 3.057M 1.000M
BURT HETTINGER CO. ND 07/10/2011 08:45 MST-7 Hail 1.00 in. 0 0 0.00K 0.00K
GLADSTONE STARK CO. ND 07/10/2011 09:15 MST-7 Hail 2.00 in. 0 0 0.00K 0.00K
ELGIN MUNI ARPT GRANT CO. ND 07/10/2011 09:30 MST-7 Hail 2.00 in. 0 0 0.00K 0.00K
GLEN ULLIN MORTON CO. ND 07/10/2011 10:30 CST-6 Hail 2.00 in. 0 0 0.00K 0.00K
GLEN ULLIN MORTON CO. ND 07/10/2011 10:50 CST-6 Hail 1.75 in. 0 0 0.00K 0.00K
ALMONT MORTON CO. ND 07/10/2011 11:02 CST-6 Hail 1.00 in. 0 0 0.00K 0.00K
MANDAN MUNI ARPT MORTON CO. ND 07/10/2011 11:10 CST-6 Thunderstorm Wind 52 kts. EG 0 0 0.00K 0.00K
(BIS)BISMARCK MUNI A BURLEIGH CO. ND 07/10/2011 11:21 CST-6 Hail 0.75 in. 0 0 0.00K 0.00K
SELFRIDGE SIOUX CO. ND 07/10/2011 11:50 MST-7 Hail 1.75 in. 0 0 0.00K 0.00K
SWEET BRIAR MORTON CO. ND 07/10/2011 12:14 CST-6 Thunderstorm Wind 52 kts. EG 0 0 0.00K 0.00K
FT YATES SIOUX CO. ND 07/10/2011 12:33 MST-7 Hail 1.00 in. 0 0 0.00K 0.00K
FT YATES SIOUX CO. ND 07/10/2011 12:33 MST-7 Thunderstorm Wind 52 kts. EG 0 0 0.00K 0.00K
FT YATES SIOUX CO. ND 07/10/2011 12:40 MST-7 Hail 2.00 in. 0 0 0.00K 0.00K
ST ANTHONY MORTON CO. ND 07/10/2011 12:43 CST-6 Hail 1.00 in. 0 0 0.00K 0.00K
HUFF MORTON CO. ND 07/10/2011 12:45 CST-6 Thunderstorm Wind 65 kts. EG 0 0 20.00K 0.00K
(BIS)BISMARCK MUNI A BURLEIGH CO. ND 07/10/2011 12:50 CST-6 Hail 1.25 in. 0 0 150.00K 0.00K
(BIS)BISMARCK MUNI A BURLEIGH CO. ND 07/10/2011 12:52 CST-6 Thunderstorm Wind 65 kts. EG 0 0 0.00K 0.00K
(BIS)BISMARCK MUNI A BURLEIGH CO. ND 07/10/2011 12:53 CST-6 Hail 1.00 in. 0 0 0.00K 0.00K
MOFFIT BURLEIGH CO. ND 07/10/2011 13:14 CST-6 Thunderstorm Wind 83 kts. EG 0 0 250.00K 0.00K
HAZELTON EMMONS CO. ND 07/10/2011 13:15 CST-6 Thunderstorm Wind 83 kts. MG 0 0 150.00K 0.00K
HAZELTON ARPT EMMONS CO. ND 07/10/2011 13:24 CST-6 Thunderstorm Wind 61 kts. EG 0 0 25.00K 0.00K
BRADDOCK EMMONS CO. ND 07/10/2011 13:33 CST-6 Thunderstorm Wind 52 kts. EG 0 0 0.00K 0.00K
NAPOLEON LOGAN CO. ND 07/10/2011 13:35 CST-6 Thunderstorm Wind 74 kts. EG 0 0 50.00K 0.00K
NAPOLEON LOGAN CO. ND 07/10/2011 13:40 CST-6 Tornado EF2 0 0 450.00K 0.00K
ASHLEY MCINTOSH CO. ND 07/10/2011 14:34 CST-6 Tornado EF0 0 0 0.00K 0.00K
MERRICOURT DICKEY CO. ND 07/10/2011 14:40 CST-6 Thunderstorm Wind 70 kts. EG 0 0 15.00K 0.00K
MERRICOURT DICKEY CO. ND 07/10/2011 14:40 CST-6 Thunderstorm Wind 109 kts. EG 0 0 1.250M 1.000M
MERRICOURT DICKEY CO. ND 07/10/2011 14:48 CST-6 Tornado EF1 0 0 75.00K 0.00K
FORBES DICKEY CO. ND 07/10/2011 15:00 CST-6 Flood 0 0 500.00K 0.00K
EDGELEY LA MOURE CO. ND 07/10/2011 15:02 CST-6 Thunderstorm Wind 52 kts. EG 0 0 0.00K 0.00K
MONANGO DICKEY CO. ND 07/10/2011 15:04 CST-6 Tornado EF0 0 0 0.00K 0.00K
ASHLEY MCINTOSH CO. ND 07/10/2011 15:09 CST-6 Thunderstorm Wind 52 kts. EG 0 0 7.00K 0.00K
EDGELEY LA MOURE CO. ND 07/10/2011 15:30 CST-6 Thunderstorm Wind 70 kts. EG 0 0 25.00K 0.00K
FULLERTON DICKEY CO. ND 07/10/2011 15:31 CST-6 Thunderstorm Wind 70 kts. EG 0 0 25.00K 0.00K
ELLENDALE DICKEY CO. ND 07/10/2011 15:35 CST-6 Thunderstorm Wind 70 kts. EG 0 0 15.00K 0.00K
GLOVER DICKEY CO. ND 07/10/2011 15:35 CST-6 Tornado EF0 0 0 0.00K 0.00K
LUDDEN DICKEY CO. ND 07/10/2011 15:42 CST-6 Thunderstorm Wind 70 kts. EG 0 0 50.00K 0.00K
Totals: 0 0 3.057M 1.000M