Alert archive / North Dakota / Severe Thunderstorm Warnings

Severe Thunderstorm Warnings in North Dakota, 2017

236 severe thunderstorm warnings in 2017. An alert counts here when it covered any part of the state, so the counties below add up to more than the state. The archive of severe thunderstorm warnings reaches back to 1986.

Severe Thunderstorm Warnings by county

Each county as a circle sized by its count in 2017. Tap one for its archive.

Severe Thunderstorm Warnings: 236
Busiest month: July120 severe thunderstorm warnings
Busiest day: June 10, 201723 severe thunderstorm warnings

Over time

By month

Warning verification

How often warnings here had a storm report inside them, and how much warning the reports had.

181 of 236 severe thunderstorm warnings covering North Dakota in 2017 had a qualifying storm report inside them; 340 of 409 hail, wind and damage reports fell inside a warning, on average 25 minutes after it went out.

North Dakota, 2017

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Severe thunderstorm warnings	236	181	23%	409	83%	25 min

Each office's whole area, 2017

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Bismarck, ND: severe thunderstorm warnings	148	98	34%	188	89%	25 min
NWS Grand Forks, ND: severe thunderstorm warnings	148	137	7%	435	76%	26 min

An office's figures cover every county it serves, including across state lines.

Verified by the Iowa Environmental Mesonet's Cow, which matches each storm-based warning with the local storm reports inside its polygon while it was in force, within 15 km of its edge: a tornado warning counts as verified on a tornado report, a severe thunderstorm warning on hail of 1 inch or more, a gust of 58 mph or more, or wind damage, a flash flood warning on a flash flood report. The false alarm ratio is the share of warnings with no such report; "inside a warning" is the probability of detection, the share of reports that fell inside one; lead time runs from the warning's issue to each report inside it, counting zero for a report that came first. A warning with no report is not proof nothing happened: reports come from spotters, the public and damage surveys, and are thin where few people live.

The alerts

Every alert, in the order issued. Times are local, Central Time. Each opens its own page with the text, the map, the radar and the sounding.

Issued	Product	Office	Counties	Lasted
Jun 2, 3:21 PM CDT	Severe Thunderstorm Warning	BIS	Kidder	39 min
Jun 2, 3:58 PM CDT	Severe Thunderstorm Warning	BIS	Kidder, Wells	41 min
Jun 2, 4:05 PM CDT	Severe Thunderstorm Warning	FGF	Benson, Ramsey, Towner	55 min
Jun 2, 4:15 PM CDT	Severe Thunderstorm Warning	FGF	Cavalier, Ramsey, Towner	60 min
Jun 2, 4:29 PM CDT	Severe Thunderstorm Warning	BIS	Kidder, Stutsman	61 min
Jun 2, 4:48 PM CDT	Severe Thunderstorm Warning	FGF	Benson	57 min
Jun 2, 5:03 PM CDT	Severe Thunderstorm Warning	FGF	Benson, Cavalier, Ramsey, Towner	57 min
Jun 2, 5:27 PM CDT	Severe Thunderstorm Warning	BIS	Stutsman	63 min
Jun 2, 5:44 PM CDT	Severe Thunderstorm Warning	FGF	Benson, Ramsey	45 min
Jun 2, 5:56 PM CDT	Severe Thunderstorm Warning	FGF	Cavalier, Ramsey, Towner	64 min
Jun 2, 6:28 PM CDT	Severe Thunderstorm Warning	BIS	Stutsman	62 min
Jun 2, 6:56 PM CDT	Severe Thunderstorm Warning	BIS	Kidder, Stutsman	64 min
Jun 2, 10:07 PM CDT	Severe Thunderstorm Warning	FGF	Grand Forks, Walsh	38 min
Jun 5, 5:01 PM CDT	Severe Thunderstorm Warning	BIS	Bowman	35 min
Jun 7, 2:39 PM CDT	Severe Thunderstorm Warning	FGF	Walsh	20 min
Jun 9, 4:43 PM CDT	Severe Thunderstorm Warning	BIS	McLean, Sheridan	62 min
Jun 9, 4:53 PM CDT	Severe Thunderstorm Warning	BIS	Bottineau, McHenry, Renville, Ward	67 min
Jun 9, 5:22 PM CDT	Severe Thunderstorm Warning	BIS	McHenry, Pierce, Sheridan	38 min
Jun 9, 5:34 PM CDT	Severe Thunderstorm Warning	FGF	Cavalier, Towner	56 min
Jun 9, 5:37 PM CDT	Severe Thunderstorm Warning	FGF	Benson	53 min
Jun 9, 5:44 PM CDT	Severe Thunderstorm Warning	BIS	Sheridan	61 min
Jun 9, 5:58 PM CDT	Severe Thunderstorm Warning	BIS	Bottineau, McHenry, Pierce	62 min
Jun 9, 6:26 PM CDT	Severe Thunderstorm Warning	BIS	McHenry, Pierce	64 min
Jun 9, 6:30 PM CDT	Severe Thunderstorm Warning	FGF	Cavalier, Pembina, Walsh	45 min
Jun 9, 6:31 PM CDT	Severe Thunderstorm Warning	BIS	Sheridan, Wells	59 min
Jun 9, 6:40 PM CDT	Severe Thunderstorm Warning	BIS	Pierce, Rolette	65 min
Jun 9, 6:48 PM CDT	Severe Thunderstorm Warning	FGF	Benson	57 min
Jun 9, 7:00 PM CDT	Severe Thunderstorm Warning	BIS	Pierce	15 min
Jun 9, 7:08 PM CDT	Severe Thunderstorm Warning	FGF	Cavalier, Pembina, Walsh	52 min
Jun 9, 7:16 PM CDT	Severe Thunderstorm Warning	BIS	Foster, Kidder, Stutsman, Wells	59 min
Jun 9, 7:56 PM CDT	Severe Thunderstorm Warning	FGF	Pembina, Walsh	64 min
Jun 9, 8:14 PM CDT	Severe Thunderstorm Warning	BIS	Foster	61 min
Jun 9, 8:20 PM CDT	Severe Thunderstorm Warning	BIS	Stutsman	55 min
Jun 9, 8:38 PM CDT	Severe Thunderstorm Warning	FGF	Benson, Eddy, Nelson	38 min
Jun 9, 8:41 PM CDT	Severe Thunderstorm Warning	BIS	Stutsman	37 min
Jun 9, 9:00 PM CDT	Severe Thunderstorm Warning	FGF	Barnes, Cass, Griggs, Steele	60 min
Jun 9, 9:13 PM CDT	Severe Thunderstorm Warning	BIS	Stutsman	46 min
Jun 9, 9:45 PM CDT	Severe Thunderstorm Warning	FGF	Barnes, Ransom	60 min
Jun 9, 10:03 PM CDT	Severe Thunderstorm Warning	FGF	Barnes, Cass, Steele, Traill	34 min
Jun 9, 10:45 PM CDT	Severe Thunderstorm Warning	FGF	Barnes, Cass	36 min
Jun 9, 11:01 PM CDT	Severe Thunderstorm Warning	FGF	Cass	44 min
Jun 9, 11:15 PM CDT	Severe Thunderstorm Warning	FGF	Cass	31 min
Jun 10, 12:33 AM CDT	Severe Thunderstorm Warning	BIS	Mercer, Morton, Stark	57 min
Jun 10, 1:18 AM CDT	Severe Thunderstorm Warning	BIS	Burleigh, McLean, Morton, Oliver	57 min
Jun 10, 3:39 AM CDT	Severe Thunderstorm Warning	BIS	Burleigh, McLean, Mercer, Oliver, Sheridan	51 min
Jun 10, 4:08 AM CDT	Severe Thunderstorm Warning	FGF	Grand Forks, Griggs, Nelson, Steele, Traill	37 min
Jun 10, 4:22 AM CDT	Severe Thunderstorm Warning	BIS	Foster, Kidder, Sheridan, Wells	53 min
Jun 10, 4:45 AM CDT	Severe Thunderstorm Warning	FGF	Grand Forks, Steele, Traill	32 min
Jun 10, 5:40 AM CDT	Severe Thunderstorm Warning	FGF	Benson, Cavalier, Eddy, Grand Forks, Nelson, Ramsey and 2 more	50 min
Jun 10, 6:07 AM CDT	Severe Thunderstorm Warning	FGF	Cavalier, Grand Forks, Nelson, Pembina, Walsh	38 min
Jun 13, 3:38 AM CDT	Severe Thunderstorm Warning	BIS	Dickey, LaMoure, McIntosh	67 min
Jun 13, 4:07 AM CDT	Severe Thunderstorm Warning	FGF	Ransom, Sargent	53 min
Jun 13, 4:58 AM CDT	Severe Thunderstorm Warning	FGF	Barnes, Cass, Ransom, Sargent	62 min
Jun 13, 6:11 PM CDT	Severe Thunderstorm Warning	BIS	Logan	37 min
Jun 13, 7:11 PM CDT	Severe Thunderstorm Warning	FGF	Cass, Richland	49 min
Jun 13, 7:27 PM CDT	Severe Thunderstorm Warning	FGF	Ransom, Sargent	48 min
Jun 13, 8:11 PM CDT	Severe Thunderstorm Warning	FGF	Cass, Ransom, Richland, Sargent	49 min
Jun 13, 8:44 PM CDT	Severe Thunderstorm Warning	FGF	Barnes, Cass, Richland, Traill	46 min
Jun 13, 8:54 PM CDT	Severe Thunderstorm Warning	FGF	Cass, Richland	66 min
Jun 13, 9:24 PM CDT	Severe Thunderstorm Warning	FGF	Cass, Grand Forks, Steele, Traill	41 min
Jun 14, 12:57 AM CDT	Severe Thunderstorm Warning	BIS	McKenzie	37 min
Jun 27, 7:50 PM CDT	Severe Thunderstorm Warning	BIS	Grant, Morton	55 min
Jun 27, 8:29 PM CDT	Severe Thunderstorm Warning	BIS	Burleigh, Morton	61 min
Jun 27, 9:30 PM CDT	Severe Thunderstorm Warning	BIS	Burleigh	60 min
Jun 27, 9:54 PM CDT	Severe Thunderstorm Warning	BIS	Burleigh, Emmons, Sioux	43 min
Jun 29, 3:24 PM CDT	Severe Thunderstorm Warning	BIS	Mountrail	66 min
Jun 29, 3:46 PM CDT	Severe Thunderstorm Warning	BIS	Mountrail	39 min
Jul 2, 6:37 PM CDT	Severe Thunderstorm Warning	BIS	Billings, Golden Valley	53 min
Jul 4, 5:40 PM CDT	Severe Thunderstorm Warning	BIS	Burleigh	65 min
Jul 4, 6:16 PM CDT	Severe Thunderstorm Warning	BIS	Burleigh	59 min
Jul 4, 6:29 PM CDT	Severe Thunderstorm Warning	BIS	Burleigh, Kidder	61 min
Jul 4, 7:08 PM CDT	Severe Thunderstorm Warning	FGF	Barnes, Griggs, Steele	52 min
Jul 4, 7:14 PM CDT	Severe Thunderstorm Warning	BIS	Burleigh, Kidder	49 min
Jul 4, 7:54 PM CDT	Severe Thunderstorm Warning	FGF	Grand Forks, Steele, Traill	51 min
Jul 4, 8:17 PM CDT	Severe Thunderstorm Warning	FGF	Barnes, Cass, Griggs, Steele, Traill	25 min
Jul 4, 8:25 PM CDT	Severe Thunderstorm Warning	FGF	Grand Forks	35 min
Jul 4, 8:41 PM CDT	Severe Thunderstorm Warning	FGF	Cass, Grand Forks, Traill	19 min
Jul 4, 8:58 PM CDT	Severe Thunderstorm Warning	FGF	Cass, Grand Forks, Traill	47 min
Jul 4, 9:20 PM CDT	Severe Thunderstorm Warning	FGF	Barnes	42 min
Jul 4, 9:47 PM CDT	Severe Thunderstorm Warning	FGF	Traill	58 min
Jul 4, 9:56 PM CDT	Severe Thunderstorm Warning	FGF	Steele, Traill	64 min
Jul 4, 10:31 PM CDT	Severe Thunderstorm Warning	FGF	Griggs, Steele	44 min
Jul 4, 10:43 PM CDT	Severe Thunderstorm Warning	FGF	Cass, Traill	62 min
Jul 4, 11:10 PM CDT	Severe Thunderstorm Warning	FGF	Cass	50 min
Jul 5, 3:53 PM CDT	Severe Thunderstorm Warning	BIS	Grant, Hettinger, Stark	67 min
Jul 5, 4:40 PM CDT	Severe Thunderstorm Warning	BIS	Adams, Grant, Hettinger, Morton, Sioux	65 min
Jul 5, 6:40 PM CDT	Severe Thunderstorm Warning	BIS	Emmons, McIntosh	38 min
Jul 5, 9:52 PM CDT	Severe Thunderstorm Warning	BIS	Foster, Wells	68 min
Jul 5, 10:23 PM CDT	Severe Thunderstorm Warning	BIS	Foster, Kidder, Stutsman	67 min
Jul 5, 11:13 PM CDT	Severe Thunderstorm Warning	FGF	Barnes, Griggs, Steele	62 min
Jul 5, 11:19 PM CDT	Severe Thunderstorm Warning	BIS	Bottineau	56 min
Jul 5, 11:21 PM CDT	Severe Thunderstorm Warning	BIS	LaMoure, Logan, Stutsman	42 min
Jul 5, 11:54 PM CDT	Severe Thunderstorm Warning	FGF	Steele, Traill	66 min
Jul 6, 12:01 AM CDT	Severe Thunderstorm Warning	FGF	Barnes	59 min
Jul 6, 12:05 AM CDT	Severe Thunderstorm Warning	BIS	Bottineau, McHenry	55 min
Jul 6, 12:09 AM CDT	Severe Thunderstorm Warning	FGF	Barnes, Cass, Steele, Traill	66 min
Jul 6, 12:45 AM CDT	Severe Thunderstorm Warning	FGF	Cavalier, Pembina, Walsh	30 min
Jul 6, 12:58 AM CDT	Severe Thunderstorm Warning	BIS	Bottineau, McHenry, Pierce	62 min
Jul 6, 1:11 AM CDT	Severe Thunderstorm Warning	FGF	Cass, Steele, Traill	64 min
Jul 6, 1:18 AM CDT	Severe Thunderstorm Warning	BIS	Foster, Wells	57 min
Jul 6, 1:58 AM CDT	Severe Thunderstorm Warning	BIS	McHenry, Pierce	47 min
Jul 6, 2:41 AM CDT	Severe Thunderstorm Warning	BIS	Pierce, Wells	54 min
Jul 6, 2:51 AM CDT	Severe Thunderstorm Warning	BIS	Foster	54 min
Jul 10, 6:04 PM CDT	Severe Thunderstorm Warning	BIS	Bowman, Slope	26 min
Jul 10, 6:30 PM CDT	Severe Thunderstorm Warning	BIS	Bowman, Slope	30 min
Jul 10, 7:06 PM CDT	Severe Thunderstorm Warning	BIS	Bowman, Slope	24 min
Jul 10, 7:26 PM CDT	Severe Thunderstorm Warning	BIS	Adams, Bowman, Hettinger, Slope, Stark	33 min
Jul 10, 7:44 PM CDT	Severe Thunderstorm Warning	BIS	Billings, Hettinger, Slope, Stark	38 min
Jul 10, 7:55 PM CDT	Severe Thunderstorm Warning	BIS	Billings, McKenzie	37 min
Jul 11, 2:59 PM CDT	Severe Thunderstorm Warning	BIS	McKenzie, Williams	61 min
Jul 11, 5:09 PM CDT	Severe Thunderstorm Warning	FGF	Grand Forks, Nelson	66 min
Jul 11, 5:45 PM CDT	Severe Thunderstorm Warning	FGF	Pembina, Walsh	60 min
Jul 11, 5:46 PM CDT	Severe Thunderstorm Warning	FGF	Grand Forks	59 min
Jul 11, 6:16 PM CDT	Severe Thunderstorm Warning	FGF	Grand Forks, Walsh	44 min
Jul 11, 7:12 PM CDT	Severe Thunderstorm Warning	FGF	Grand Forks, Walsh	36 min
Jul 11, 7:30 PM CDT	Severe Thunderstorm Warning	FGF	Pembina	41 min
Jul 14, 4:14 PM CDT	Severe Thunderstorm Warning	BIS	McLean, Mercer	61 min
Jul 14, 4:17 PM CDT	Severe Thunderstorm Warning	BIS	McHenry, Ward	43 min
Jul 14, 5:04 PM CDT	Severe Thunderstorm Warning	BIS	McHenry, McLean, Sheridan, Ward	43 min
Jul 14, 5:15 PM CDT	Severe Thunderstorm Warning	BIS	McLean, Mercer, Oliver, Sheridan	60 min
Jul 14, 6:00 PM CDT	Severe Thunderstorm Warning	BIS	Burleigh, McLean, Oliver	60 min
Jul 14, 6:59 PM CDT	Severe Thunderstorm Warning	BIS	Burleigh, Emmons, Morton	51 min
Jul 17, 3:18 PM CDT	Severe Thunderstorm Warning	FGF	Richland	57 min
Jul 18, 2:59 AM CDT	Severe Thunderstorm Warning	BIS	Emmons, Sioux	61 min
Jul 19, 5:28 AM CDT	Severe Thunderstorm Warning	BIS	Billings, Golden Valley, Slope	62 min
Jul 19, 6:22 AM CDT	Severe Thunderstorm Warning	BIS	Adams, Bowman, Hettinger, Slope	53 min
Jul 19, 6:49 AM CDT	Severe Thunderstorm Warning	BIS	Grant, Sioux	56 min
Jul 19, 7:43 AM CDT	Severe Thunderstorm Warning	BIS	Emmons, Grant, Sioux	49 min
Jul 19, 7:56 AM CDT	Severe Thunderstorm Warning	BIS	Rolette	52 min
Jul 19, 8:28 AM CDT	Severe Thunderstorm Warning	FGF	Towner	49 min
Jul 19, 9:30 AM CDT	Severe Thunderstorm Warning	BIS	Grant, Hettinger, Morton, Stark	60 min
Jul 20, 3:15 PM CDT	Severe Thunderstorm Warning	BIS	McKenzie	60 min
Jul 20, 3:49 PM CDT	Severe Thunderstorm Warning	BIS	Dunn, McKenzie	56 min
Jul 20, 4:19 PM CDT	Severe Thunderstorm Warning	BIS	Dunn, McKenzie, McLean, Mountrail	56 min
Jul 20, 4:27 PM CDT	Severe Thunderstorm Warning	BIS	Billings, Golden Valley, Slope, Stark	63 min
Jul 20, 5:05 PM CDT	Severe Thunderstorm Warning	BIS	Billings, Dunn, Stark	55 min
Jul 20, 5:17 PM CDT	Severe Thunderstorm Warning	BIS	Dunn, McLean, Mercer	58 min
Jul 20, 5:33 PM CDT	Severe Thunderstorm Warning	BIS	Adams, Bowman, Hettinger, Slope	57 min
Jul 20, 6:01 PM CDT	Severe Thunderstorm Warning	BIS	Grant, Morton, Stark	59 min
Jul 20, 6:13 PM CDT	Severe Thunderstorm Warning	BIS	McLean, Mercer, Morton, Oliver, Stark	33 min
Jul 20, 6:29 PM CDT	Severe Thunderstorm Warning	BIS	Adams, Bowman, Grant, Hettinger, Slope, Stark	61 min
Jul 20, 7:17 PM CDT	Severe Thunderstorm Warning	BIS	Adams, Grant, Hettinger, Morton, Sioux, Stark	58 min
Jul 21, 9:59 AM CDT	Severe Thunderstorm Warning	FGF	Cavalier	61 min
Jul 21, 1:50 PM CDT	Severe Thunderstorm Warning	BIS	Sheridan, Wells	55 min
Jul 21, 2:44 PM CDT	Severe Thunderstorm Warning	BIS	Foster, Stutsman, Wells	61 min
Jul 21, 3:24 PM CDT	Severe Thunderstorm Warning	FGF	Barnes, Eddy, Griggs, Steele	66 min
Jul 21, 4:10 PM CDT	Severe Thunderstorm Warning	FGF	Barnes, Cass, Steele, Traill	65 min
Jul 21, 4:51 PM CDT	Severe Thunderstorm Warning	FGF	Cass	54 min
Jul 21, 6:01 PM CDT	Severe Thunderstorm Warning	FGF	Richland	35 min
Jul 21, 6:43 PM CDT	Severe Thunderstorm Warning	BIS	Grant, Sioux	62 min
Jul 21, 7:18 PM CDT	Severe Thunderstorm Warning	BIS	Bottineau, Burke, Renville	57 min
Jul 21, 7:19 PM CDT	Severe Thunderstorm Warning	BIS	Emmons, Logan, McIntosh	56 min
Jul 21, 8:10 PM CDT	Severe Thunderstorm Warning	BIS	LaMoure, Logan, Stutsman	65 min
Jul 21, 8:10 PM CDT	Severe Thunderstorm Warning	BIS	McHenry, McLean, Sheridan, Ward	65 min
Jul 21, 8:14 PM CDT	Severe Thunderstorm Warning	BIS	Bottineau, Renville	61 min
Jul 21, 8:16 PM CDT	Severe Thunderstorm Warning	BIS	Burleigh, McLean, Oliver	59 min
Jul 21, 9:09 PM CDT	Severe Thunderstorm Warning	BIS	Bottineau, McHenry, Pierce, Rolette	66 min
Jul 21, 9:13 PM CDT	Severe Thunderstorm Warning	BIS	Burleigh	62 min
Jul 21, 9:40 PM CDT	Severe Thunderstorm Warning	BIS	McHenry, Pierce, Ward	65 min
Jul 21, 9:44 PM CDT	Severe Thunderstorm Warning	BIS	Dickey, LaMoure	61 min
Jul 21, 9:47 PM CDT	Severe Thunderstorm Warning	BIS	Burleigh, Morton, Oliver	58 min
Jul 21, 10:12 PM CDT	Severe Thunderstorm Warning	BIS	McHenry, Pierce	33 min
Jul 21, 10:24 PM CDT	Severe Thunderstorm Warning	BIS	Burleigh, Morton	66 min
Jul 21, 10:51 PM CDT	Severe Thunderstorm Warning	BIS	Pierce	54 min
Jul 21, 10:52 PM CDT	Severe Thunderstorm Warning	BIS	Burleigh, Emmons, Morton	68 min
Jul 21, 11:00 PM CDT	Severe Thunderstorm Warning	BIS	LaMoure	15 min
Jul 21, 11:14 PM CDT	Severe Thunderstorm Warning	FGF	Benson, Ramsey	46 min
Jul 21, 11:41 PM CDT	Severe Thunderstorm Warning	BIS	Logan, McIntosh	64 min
Jul 22, 12:25 AM CDT	Severe Thunderstorm Warning	FGF	Eddy	27 min
Jul 22, 2:37 AM CDT	Severe Thunderstorm Warning	FGF	Cass, Traill	38 min
Jul 22, 3:07 AM CDT	Severe Thunderstorm Warning	FGF	Cass, Ransom, Richland, Sargent	53 min
Jul 24, 8:49 PM CDT	Severe Thunderstorm Warning	BIS	Bottineau	46 min
Jul 24, 10:39 PM CDT	Severe Thunderstorm Warning	BIS	McHenry, Ward	52 min
Jul 24, 11:41 PM CDT	Severe Thunderstorm Warning	BIS	McHenry	31 min
Jul 24, 11:47 PM CDT	Severe Thunderstorm Warning	BIS	Bottineau, Rolette	58 min
Jul 29, 2:56 PM CDT	Severe Thunderstorm Warning	BIS	Dunn, McKenzie	64 min
Jul 29, 4:29 PM CDT	Severe Thunderstorm Warning	BIS	Renville, Ward	61 min
Jul 29, 6:37 PM CDT	Severe Thunderstorm Warning	BIS	McLean, Mountrail	68 min
Jul 29, 6:38 PM CDT	Severe Thunderstorm Warning	FGF	Towner	37 min
Jul 29, 7:11 PM CDT	Severe Thunderstorm Warning	BIS	Williams	41 min
Jul 31, 3:06 PM CDT	Severe Thunderstorm Warning	BIS	Grant, Hettinger	54 min
Jul 31, 3:51 PM CDT	Severe Thunderstorm Warning	BIS	Adams, Grant, Hettinger, Sioux	38 min
Jul 31, 5:52 PM CDT	Severe Thunderstorm Warning	BIS	Burleigh	53 min
Jul 31, 6:10 PM CDT	Severe Thunderstorm Warning	BIS	Kidder	45 min
Jul 31, 6:22 PM CDT	Severe Thunderstorm Warning	BIS	Burleigh, Morton	29 min
Jul 31, 6:35 PM CDT	Severe Thunderstorm Warning	FGF	Grand Forks, Walsh	55 min
Jul 31, 6:52 PM CDT	Severe Thunderstorm Warning	FGF	Grand Forks	38 min
Jul 31, 7:30 PM CDT	Severe Thunderstorm Warning	FGF	Grand Forks, Traill	60 min
Jul 31, 8:00 PM CDT	Severe Thunderstorm Warning	FGF	Steele, Traill	45 min
Jul 31, 8:31 PM CDT	Severe Thunderstorm Warning	FGF	Barnes, Cass, Steele, Traill	59 min
Jul 31, 9:13 PM CDT	Severe Thunderstorm Warning	FGF	Cass, Ransom, Richland	62 min
Jul 31, 9:23 PM CDT	Severe Thunderstorm Warning	FGF	Barnes, Cass, Ransom	52 min
Aug 5, 6:14 PM CDT	Severe Thunderstorm Warning	BIS	Adams	46 min
Aug 8, 4:22 PM CDT	Severe Thunderstorm Warning	BIS	Adams, Sioux	53 min
Aug 8, 4:52 PM CDT	Severe Thunderstorm Warning	BIS	Adams, Bowman, Hettinger, Slope	35 min
Aug 9, 2:43 PM CDT	Severe Thunderstorm Warning	FGF	Barnes	62 min
Aug 9, 3:07 PM CDT	Severe Thunderstorm Warning	BIS	LaMoure	53 min
Aug 9, 3:27 PM CDT	Severe Thunderstorm Warning	BIS	Dickey	34 min
Aug 9, 4:29 PM CDT	Severe Thunderstorm Warning	FGF	Barnes, Cass, Ransom, Richland	31 min
Aug 9, 4:56 PM CDT	Severe Thunderstorm Warning	FGF	Cass, Ransom, Richland	49 min
Aug 11, 6:08 PM CDT	Severe Thunderstorm Warning	BIS	Adams	42 min
Aug 11, 8:06 PM CDT	Severe Thunderstorm Warning	BIS	Golden Valley, McKenzie	54 min
Aug 11, 8:57 PM CDT	Severe Thunderstorm Warning	BIS	Golden Valley	63 min
Aug 11, 9:54 PM CDT	Severe Thunderstorm Warning	BIS	Billings, Golden Valley	66 min
Aug 11, 10:57 PM CDT	Severe Thunderstorm Warning	BIS	Billings, Golden Valley, Slope, Stark	63 min
Aug 12, 2:13 PM CDT	Severe Thunderstorm Warning	BIS	McIntosh	62 min
Aug 12, 3:39 PM CDT	Severe Thunderstorm Warning	BIS	Bowman	31 min
Aug 12, 4:34 PM CDT	Severe Thunderstorm Warning	BIS	Mercer	56 min
Aug 12, 5:14 PM CDT	Severe Thunderstorm Warning	BIS	Hettinger, Slope, Stark	61 min
Aug 12, 5:36 PM CDT	Severe Thunderstorm Warning	BIS	Grant, Morton	54 min
Aug 12, 6:17 PM CDT	Severe Thunderstorm Warning	BIS	Adams, Hettinger	58 min
Aug 12, 6:25 PM CDT	Severe Thunderstorm Warning	BIS	Grant, Sioux	65 min
Aug 12, 7:15 PM CDT	Severe Thunderstorm Warning	BIS	Adams	41 min
Aug 17, 8:17 PM CDT	Severe Thunderstorm Warning	BIS	Divide, Williams	58 min
Aug 17, 9:10 PM CDT	Severe Thunderstorm Warning	BIS	Divide, Williams	43 min
Aug 17, 9:18 PM CDT	Severe Thunderstorm Warning	BIS	Burke	37 min
Aug 18, 4:24 AM CDT	Severe Thunderstorm Warning	BIS	Foster, Stutsman, Wells	55 min
Aug 26, 4:11 PM CDT	Severe Thunderstorm Warning	BIS	Grant, Hettinger	64 min
Aug 26, 4:50 PM CDT	Severe Thunderstorm Warning	BIS	Adams, Grant, Hettinger, Sioux	55 min
Aug 26, 5:11 PM CDT	Severe Thunderstorm Warning	BIS	Adams, Bowman, Slope	42 min
Sep 1, 6:12 PM CDT	Severe Thunderstorm Warning	FGF	Grand Forks, Nelson, Steele	33 min
Sep 1, 6:54 PM CDT	Severe Thunderstorm Warning	FGF	Griggs, Steele	51 min
Sep 1, 7:43 PM CDT	Severe Thunderstorm Warning	FGF	Barnes, Cass, Steele	47 min
Sep 19, 1:37 PM CDT	Severe Thunderstorm Warning	BIS	Kidder, Stutsman	38 min
Sep 19, 2:54 PM CDT	Severe Thunderstorm Warning	BIS	Dickey, McIntosh	51 min
Sep 19, 3:43 PM CDT	Severe Thunderstorm Warning	BIS	Dickey, LaMoure	62 min
Sep 19, 4:19 PM CDT	Severe Thunderstorm Warning	FGF	Barnes, Ransom	41 min
Sep 19, 5:14 PM CDT	Severe Thunderstorm Warning	FGF	Barnes, Cass	61 min
Sep 19, 5:56 PM CDT	Severe Thunderstorm Warning	FGF	Cass, Traill	52 min
Sep 19, 6:47 PM CDT	Severe Thunderstorm Warning	FGF	Benson, Ramsey, Towner	58 min
Sep 19, 7:26 PM CDT	Severe Thunderstorm Warning	BIS	Dickey, LaMoure	64 min
Sep 19, 8:03 PM CDT	Severe Thunderstorm Warning	BIS	Dickey	42 min
Sep 19, 8:03 PM CDT	Severe Thunderstorm Warning	BIS	Dickey	42 min
Sep 19, 8:13 PM CDT	Severe Thunderstorm Warning	FGF	Ransom, Sargent	62 min
Sep 19, 9:04 PM CDT	Severe Thunderstorm Warning	FGF	Ransom, Richland, Sargent	56 min
Oct 1, 4:03 PM CDT	Severe Thunderstorm Warning	BIS	Kidder	23 min

By county

Every county with at least one alert. A county page lists each alert that covered it.

13 more counties

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record The radar archive 2016 2018

Sources

National Weather Service watches, warnings, advisories and statements from the Iowa Environmental Mesonet's VTEC archive, which reconstructs tornado, severe thunderstorm, flash flood and marine warnings back to 1986 from the NWS text archive. Storm Prediction Center watches and mesoscale discussions from SPC's archive through the Mesonet. County centers from the US Census Bureau. Warning verification from the Mesonet's Cow. Rebuilt daily.