Alert archive / North Dakota / Severe Thunderstorm Warnings

Severe Thunderstorm Warnings in North Dakota, 2015

265 severe thunderstorm warnings in 2015. 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 2015. Tap one for its archive.

Severe Thunderstorm Warnings: 265
Busiest month: July134 severe thunderstorm warnings
Busiest day: July 24, 201520 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.

183 of 265 severe thunderstorm warnings covering North Dakota in 2015 had a qualifying storm report inside them; 286 of 401 hail, wind and damage reports fell inside a warning, on average 25 minutes after it went out.

North Dakota, 2015

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Severe thunderstorm warnings	265	183	31%	401	71%	25 min

Each office's whole area, 2015

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Grand Forks, ND: severe thunderstorm warnings	133	103	23%	324	69%	27 min
NWS Bismarck, ND: severe thunderstorm warnings	183	122	33%	264	77%	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
Mar 28, 6:41 PM CDT	Severe Thunderstorm Warning	BIS	Dunn, Mercer, Morton, Stark	49 min
Mar 28, 7:10 PM CDT	Severe Thunderstorm Warning	BIS	McLean, Mercer	50 min
Mar 28, 7:14 PM CDT	Severe Thunderstorm Warning	BIS	Grant, McLean, Mercer, Morton, Oliver	46 min
Mar 28, 7:27 PM CDT	Severe Thunderstorm Warning	BIS	Adams, Grant, Hettinger, Sioux, Stark	48 min
Mar 28, 7:52 PM CDT	Severe Thunderstorm Warning	BIS	Burleigh, McLean, Mercer, Morton, Oliver, Sheridan	38 min
Mar 28, 7:58 PM CDT	Severe Thunderstorm Warning	BIS	Emmons, Grant, Morton, Sioux	47 min
Mar 28, 8:26 PM CDT	Severe Thunderstorm Warning	BIS	Burleigh, Kidder	64 min
Mar 28, 8:40 PM CDT	Severe Thunderstorm Warning	BIS	Emmons, Logan, McIntosh, Morton, Sioux	50 min
May 2, 5:37 PM CDT	Severe Thunderstorm Warning	FGF	Traill	38 min
May 16, 7:14 PM CDT	Severe Thunderstorm Warning	BIS	Stutsman	46 min
May 16, 7:23 PM CDT	Severe Thunderstorm Warning	BIS	Billings, Golden Valley	52 min
May 16, 8:14 PM CDT	Severe Thunderstorm Warning	BIS	Billings, Golden Valley, Slope	61 min
May 16, 9:53 PM CDT	Severe Thunderstorm Warning	BIS	Adams, Bowman, Slope	44 min
May 28, 2:27 PM CDT	Severe Thunderstorm Warning	BIS	LaMoure, Stutsman	48 min
May 28, 7:09 PM CDT	Severe Thunderstorm Warning	BIS	Dickey	66 min
Jun 1, 5:49 PM CDT	Severe Thunderstorm Warning	BIS	Mountrail, Renville, Ward	56 min
Jun 1, 6:44 PM CDT	Severe Thunderstorm Warning	BIS	Mountrail, Ward	61 min
Jun 1, 6:56 PM CDT	Severe Thunderstorm Warning	BIS	Mountrail, Ward	64 min
Jun 1, 7:47 PM CDT	Severe Thunderstorm Warning	BIS	Bottineau	43 min
Jun 1, 8:49 PM CDT	Severe Thunderstorm Warning	BIS	McLean, Mercer	56 min
Jun 1, 9:32 PM CDT	Severe Thunderstorm Warning	BIS	McLean, Mercer	32 min
Jun 1, 9:51 PM CDT	Severe Thunderstorm Warning	BIS	Dunn, Mercer	54 min
Jun 2, 2:43 PM CDT	Severe Thunderstorm Warning	BIS	Emmons, Sioux	62 min
Jun 2, 3:34 PM CDT	Severe Thunderstorm Warning	BIS	Dunn, Mercer, Morton, Stark	56 min
Jun 2, 3:43 PM CDT	Severe Thunderstorm Warning	BIS	Dunn, McKenzie, McLean, Mountrail	62 min
Jun 2, 3:52 PM CDT	Severe Thunderstorm Warning	BIS	Emmons	53 min
Jun 2, 4:48 PM CDT	Severe Thunderstorm Warning	BIS	Morton	57 min
Jun 2, 5:44 PM CDT	Severe Thunderstorm Warning	BIS	Burleigh, Emmons, Morton, Sioux	61 min
Jun 2, 6:39 PM CDT	Severe Thunderstorm Warning	BIS	Emmons, Morton, Sioux	66 min
Jun 2, 7:02 PM CDT	Severe Thunderstorm Warning	BIS	Foster, Stutsman	58 min
Jun 2, 7:17 PM CDT	Severe Thunderstorm Warning	BIS	Dickey, LaMoure	58 min
Jun 2, 9:00 PM CDT	Severe Thunderstorm Warning	FGF	Cass, Traill	30 min
Jun 2, 9:15 PM CDT	Severe Thunderstorm Warning	FGF	Sargent	45 min
Jun 2, 9:19 PM CDT	Severe Thunderstorm Warning	FGF	Cass, Traill	56 min
Jun 7, 1:45 PM CDT	Severe Thunderstorm Warning	FGF	Walsh	60 min
Jun 7, 1:57 PM CDT	Severe Thunderstorm Warning	FGF	Pembina	63 min
Jun 7, 4:39 PM CDT	Severe Thunderstorm Warning	FGF	Grand Forks	36 min
Jun 7, 7:51 PM CDT	Severe Thunderstorm Warning	FGF	Pembina, Walsh	54 min
Jun 13, 4:41 PM CDT	Severe Thunderstorm Warning	BIS	Burleigh	34 min
Jun 14, 4:26 AM CDT	Severe Thunderstorm Warning	BIS	Logan	64 min
Jun 19, 5:11 PM CDT	Severe Thunderstorm Warning	BIS	McKenzie, Williams	64 min
Jun 19, 5:47 PM CDT	Severe Thunderstorm Warning	BIS	Billings, Golden Valley, McKenzie	58 min
Jun 19, 6:02 PM CDT	Severe Thunderstorm Warning	BIS	Dunn, McKenzie	58 min
Jun 19, 6:19 PM CDT	Severe Thunderstorm Warning	BIS	Bowman, Slope	56 min
Jun 19, 6:31 PM CDT	Severe Thunderstorm Warning	BIS	Billings, Golden Valley	41 min
Jun 19, 6:41 PM CDT	Severe Thunderstorm Warning	BIS	Billings, Dunn, McKenzie, McLean, Mercer	64 min
Jun 19, 7:09 PM CDT	Severe Thunderstorm Warning	BIS	Adams, Bowman	29 min
Jun 19, 7:38 PM CDT	Severe Thunderstorm Warning	BIS	Dunn, Mercer, Morton, Oliver, Stark	67 min
Jun 19, 8:21 PM CDT	Severe Thunderstorm Warning	BIS	Burleigh, McLean, Morton, Oliver	54 min
Jun 19, 8:43 PM CDT	Severe Thunderstorm Warning	BIS	Burleigh, Kidder, Morton	62 min
Jun 19, 9:15 PM CDT	Severe Thunderstorm Warning	BIS	Emmons, Logan, Morton, Sioux	30 min
Jun 19, 9:45 PM CDT	Severe Thunderstorm Warning	BIS	Burleigh, Emmons, Kidder, Logan, McIntosh, Stutsman	60 min
Jun 20, 3:24 PM CDT	Severe Thunderstorm Warning	BIS	Pierce	20 min
Jun 20, 3:32 PM CDT	Severe Thunderstorm Warning	FGF	Benson	28 min
Jun 20, 3:38 PM CDT	Severe Thunderstorm Warning	FGF	Cavalier, Ramsey, Towner	52 min
Jun 20, 4:17 PM CDT	Severe Thunderstorm Warning	FGF	Benson	43 min
Jun 20, 4:23 PM CDT	Severe Thunderstorm Warning	FGF	Benson, Ramsey, Towner	52 min
Jun 20, 4:30 PM CDT	Severe Thunderstorm Warning	FGF	Eddy	32 min
Jun 20, 5:01 PM CDT	Severe Thunderstorm Warning	BIS	Foster	44 min
Jun 20, 6:03 PM CDT	Severe Thunderstorm Warning	FGF	Barnes, Cass	37 min
Jun 20, 6:13 PM CDT	Severe Thunderstorm Warning	FGF	Barnes, Cass, Griggs	31 min
Jun 20, 6:25 PM CDT	Severe Thunderstorm Warning	FGF	Grand Forks, Griggs, Nelson, Steele	50 min
Jun 20, 6:33 PM CDT	Severe Thunderstorm Warning	FGF	Eddy, Griggs, Nelson	42 min
Jun 20, 7:16 PM CDT	Severe Thunderstorm Warning	FGF	Richland	59 min
Jun 20, 7:51 PM CDT	Severe Thunderstorm Warning	FGF	Richland	36 min
Jun 20, 8:09 PM CDT	Severe Thunderstorm Warning	BIS	McHenry, Pierce	66 min
Jun 20, 9:16 PM CDT	Severe Thunderstorm Warning	BIS	Pierce, Sheridan, Wells	59 min
Jun 20, 10:17 PM CDT	Severe Thunderstorm Warning	BIS	Wells	43 min
Jun 21, 2:51 PM CDT	Severe Thunderstorm Warning	BIS	Divide, Williams	54 min
Jun 21, 3:54 PM CDT	Severe Thunderstorm Warning	BIS	Burke, Mountrail, Ward	51 min
Jun 21, 4:47 PM CDT	Severe Thunderstorm Warning	BIS	Mountrail, Renville, Ward	30 min
Jun 21, 5:35 PM CDT	Severe Thunderstorm Warning	BIS	Bowman	55 min
Jun 21, 6:28 PM CDT	Severe Thunderstorm Warning	BIS	Bowman	62 min
Jun 21, 6:41 PM CDT	Severe Thunderstorm Warning	BIS	Adams, Bowman, Hettinger, Slope	64 min
Jun 21, 7:20 PM CDT	Severe Thunderstorm Warning	FGF	Benson, Ramsey, Towner	55 min
Jun 21, 7:47 PM CDT	Severe Thunderstorm Warning	BIS	McHenry, Pierce	31 min
Jun 21, 8:29 PM CDT	Severe Thunderstorm Warning	BIS	Burleigh, Morton	61 min
Jun 21, 8:32 PM CDT	Severe Thunderstorm Warning	BIS	Adams, Grant, Hettinger, Sioux	58 min
Jun 21, 9:11 PM CDT	Severe Thunderstorm Warning	BIS	Emmons, Morton, Sioux	64 min
Jun 21, 10:03 PM CDT	Severe Thunderstorm Warning	BIS	Foster, Stutsman	42 min
Jun 21, 10:07 PM CDT	Severe Thunderstorm Warning	BIS	Emmons, Logan, McIntosh	53 min
Jun 21, 10:26 PM CDT	Severe Thunderstorm Warning	BIS	Bowman	64 min
Jun 21, 10:29 PM CDT	Severe Thunderstorm Warning	FGF	Barnes, Griggs, Steele	61 min
Jun 21, 10:49 PM CDT	Severe Thunderstorm Warning	BIS	Dickey, McIntosh	56 min
Jun 21, 11:16 PM CDT	Severe Thunderstorm Warning	BIS	Adams, Bowman, Hettinger, Slope	59 min
Jun 23, 4:58 PM CDT	Severe Thunderstorm Warning	BIS	Golden Valley, Slope	47 min
Jun 23, 5:57 PM CDT	Severe Thunderstorm Warning	BIS	Bowman, Slope	63 min
Jun 23, 7:57 PM CDT	Severe Thunderstorm Warning	BIS	Adams, Grant, Hettinger, Sioux	46 min
Jun 24, 4:46 PM CDT	Severe Thunderstorm Warning	FGF	Traill	48 min
Jun 24, 7:48 PM CDT	Severe Thunderstorm Warning	BIS	Dunn, Stark	57 min
Jun 24, 9:02 PM CDT	Severe Thunderstorm Warning	BIS	Mercer, Oliver	39 min
Jun 25, 4:14 PM CDT	Severe Thunderstorm Warning	BIS	Ward	31 min
Jun 25, 4:33 PM CDT	Severe Thunderstorm Warning	BIS	Dunn, Mercer	57 min
Jun 27, 4:23 PM CDT	Severe Thunderstorm Warning	BIS	Dickey, LaMoure	52 min
Jun 27, 5:03 PM CDT	Severe Thunderstorm Warning	FGF	Grand Forks, Walsh	27 min
Jun 27, 7:30 PM CDT	Severe Thunderstorm Warning	FGF	Cass, Richland	30 min
Jun 27, 7:52 PM CDT	Severe Thunderstorm Warning	FGF	Richland	17 min
Jun 30, 5:44 PM CDT	Severe Thunderstorm Warning	BIS	McKenzie	61 min
Jun 30, 6:18 PM CDT	Severe Thunderstorm Warning	BIS	Golden Valley, Slope	57 min
Jun 30, 6:25 PM CDT	Severe Thunderstorm Warning	BIS	Billings, Golden Valley, McKenzie	65 min
Jun 30, 7:11 PM CDT	Severe Thunderstorm Warning	BIS	Bowman, Slope	64 min
Jun 30, 7:30 PM CDT	Severe Thunderstorm Warning	BIS	Billings, Golden Valley	47 min
Jun 30, 7:59 PM CDT	Severe Thunderstorm Warning	BIS	Adams, Bowman	61 min
Jun 30, 8:08 PM CDT	Severe Thunderstorm Warning	BIS	Billings, Dunn, McKenzie	56 min
Jun 30, 8:22 PM CDT	Severe Thunderstorm Warning	BIS	Bowman, Slope	41 min
Jun 30, 10:37 PM CDT	Severe Thunderstorm Warning	BIS	Grant	38 min
Jun 30, 11:17 PM CDT	Severe Thunderstorm Warning	BIS	Grant, Sioux	58 min
Jul 1, 10:05 PM CDT	Severe Thunderstorm Warning	BIS	Golden Valley, Slope	55 min
Jul 1, 10:28 PM CDT	Severe Thunderstorm Warning	BIS	Billings, Slope	62 min
Jul 4, 3:09 PM CDT	Severe Thunderstorm Warning	BIS	Burke, Divide, Williams	66 min
Jul 4, 3:54 PM CDT	Severe Thunderstorm Warning	BIS	Williams	51 min
Jul 4, 4:15 PM CDT	Severe Thunderstorm Warning	BIS	Burke, Divide, Mountrail, Williams	45 min
Jul 4, 5:37 PM CDT	Severe Thunderstorm Warning	BIS	Bottineau, Renville	53 min
Jul 4, 5:53 PM CDT	Severe Thunderstorm Warning	BIS	Dunn, McKenzie, Mountrail	52 min
Jul 4, 6:23 PM CDT	Severe Thunderstorm Warning	BIS	Burke, Ward	67 min
Jul 4, 6:39 PM CDT	Severe Thunderstorm Warning	BIS	Dunn, McLean, Mountrail, Ward	40 min
Jul 4, 7:17 PM CDT	Severe Thunderstorm Warning	BIS	Bottineau, McHenry, Renville, Ward	58 min
Jul 4, 9:07 PM CDT	Severe Thunderstorm Warning	BIS	Rolette	38 min
Jul 4, 10:52 PM CDT	Severe Thunderstorm Warning	BIS	Wells	38 min
Jul 4, 10:54 PM CDT	Severe Thunderstorm Warning	FGF	Benson, Nelson, Ramsey	66 min
Jul 4, 10:55 PM CDT	Severe Thunderstorm Warning	FGF	Eddy	65 min
Jul 4, 11:52 PM CDT	Severe Thunderstorm Warning	FGF	Nelson	38 min
Jul 5, 12:02 AM CDT	Severe Thunderstorm Warning	FGF	Eddy	19 min
Jul 5, 12:18 AM CDT	Severe Thunderstorm Warning	BIS	Foster	57 min
Jul 5, 10:02 AM CDT	Severe Thunderstorm Warning	FGF	Grand Forks, Nelson, Pembina, Ramsey, Walsh	58 min
Jul 5, 10:18 AM CDT	Severe Thunderstorm Warning	FGF	Benson, Eddy, Griggs, Nelson, Ramsey	57 min
Jul 5, 10:58 AM CDT	Severe Thunderstorm Warning	FGF	Cass, Grand Forks, Griggs, Nelson, Steele, Traill and 1 more	62 min
Jul 5, 11:08 AM CDT	Severe Thunderstorm Warning	FGF	Grand Forks, Walsh	52 min
Jul 5, 11:33 AM CDT	Severe Thunderstorm Warning	FGF	Cass, Grand Forks, Griggs, Steele, Traill	38 min
Jul 5, 11:49 AM CDT	Severe Thunderstorm Warning	FGF	Grand Forks	41 min
Jul 7, 5:27 PM CDT	Severe Thunderstorm Warning	BIS	Dunn, Stark	46 min
Jul 8, 4:51 PM CDT	Severe Thunderstorm Warning	FGF	Pembina, Walsh	39 min
Jul 8, 5:30 PM CDT	Severe Thunderstorm Warning	FGF	Walsh	41 min
Jul 8, 6:00 PM CDT	Severe Thunderstorm Warning	FGF	Walsh	44 min
Jul 11, 5:21 PM CDT	Severe Thunderstorm Warning	BIS	Burke	54 min
Jul 11, 5:58 PM CDT	Severe Thunderstorm Warning	BIS	Burleigh, McLean, Sheridan	62 min
Jul 11, 7:13 PM CDT	Severe Thunderstorm Warning	BIS	Burleigh, McLean	62 min
Jul 11, 8:08 PM CDT	Severe Thunderstorm Warning	BIS	Bottineau, Rolette	52 min
Jul 11, 9:17 PM CDT	Severe Thunderstorm Warning	FGF	Benson, Towner	58 min
Jul 11, 9:21 PM CDT	Severe Thunderstorm Warning	BIS	Rolette	54 min
Jul 11, 11:01 PM CDT	Severe Thunderstorm Warning	FGF	Benson, Ramsey, Towner	59 min
Jul 11, 11:24 PM CDT	Severe Thunderstorm Warning	FGF	Benson, Ramsey	36 min
Jul 12, 4:50 AM CDT	Severe Thunderstorm Warning	FGF	Grand Forks	55 min
Jul 12, 2:48 PM CDT	Severe Thunderstorm Warning	FGF	Benson, Ramsey	46 min
Jul 12, 3:55 PM CDT	Severe Thunderstorm Warning	FGF	Nelson, Ramsey, Walsh	65 min
Jul 12, 4:46 PM CDT	Severe Thunderstorm Warning	FGF	Pembina, Walsh	59 min
Jul 12, 5:29 PM CDT	Severe Thunderstorm Warning	FGF	Walsh	34 min
Jul 12, 5:43 PM CDT	Severe Thunderstorm Warning	FGF	Pembina, Walsh	62 min
Jul 12, 7:36 PM CDT	Severe Thunderstorm Warning	BIS	McHenry, Pierce	54 min
Jul 12, 8:05 PM CDT	Severe Thunderstorm Warning	FGF	Benson, Ramsey	55 min
Jul 12, 8:15 PM CDT	Severe Thunderstorm Warning	BIS	Wells	60 min
Jul 12, 8:45 PM CDT	Severe Thunderstorm Warning	FGF	Eddy	60 min
Jul 12, 8:56 PM CDT	Severe Thunderstorm Warning	BIS	Foster, Wells	64 min
Jul 12, 9:00 PM CDT	Severe Thunderstorm Warning	FGF	Benson, Ramsey	45 min
Jul 12, 9:11 PM CDT	Severe Thunderstorm Warning	FGF	Ramsey	34 min
Jul 12, 9:57 PM CDT	Severe Thunderstorm Warning	BIS	Foster, Stutsman	63 min
Jul 12, 10:54 PM CDT	Severe Thunderstorm Warning	FGF	Barnes	66 min
Jul 12, 11:49 PM CDT	Severe Thunderstorm Warning	FGF	Barnes, Cass	56 min
Jul 14, 5:04 PM CDT	Severe Thunderstorm Warning	BIS	Emmons	56 min
Jul 14, 5:05 PM CDT	Severe Thunderstorm Warning	FGF	Walsh	40 min
Jul 14, 5:28 PM CDT	Severe Thunderstorm Warning	BIS	McHenry	62 min
Jul 15, 5:09 PM CDT	Severe Thunderstorm Warning	BIS	Grant, Morton	51 min
Jul 15, 5:35 PM CDT	Severe Thunderstorm Warning	BIS	McKenzie	40 min
Jul 15, 5:50 PM CDT	Severe Thunderstorm Warning	BIS	Adams, Grant, Hettinger, Sioux	55 min
Jul 15, 5:56 PM CDT	Severe Thunderstorm Warning	BIS	Mercer, Oliver	49 min
Jul 15, 6:10 PM CDT	Severe Thunderstorm Warning	BIS	McKenzie, Williams	65 min
Jul 15, 6:14 PM CDT	Severe Thunderstorm Warning	BIS	McLean, Mercer	61 min
Jul 15, 6:18 PM CDT	Severe Thunderstorm Warning	BIS	Grant, Hettinger	57 min
Jul 15, 6:45 PM CDT	Severe Thunderstorm Warning	BIS	McLean, Mercer	60 min
Jul 15, 7:17 PM CDT	Severe Thunderstorm Warning	BIS	McLean, Mountrail, Ward	58 min
Jul 15, 7:18 PM CDT	Severe Thunderstorm Warning	BIS	Divide	21 min
Jul 15, 7:23 PM CDT	Severe Thunderstorm Warning	BIS	McLean, Ward	67 min
Jul 15, 7:27 PM CDT	Severe Thunderstorm Warning	BIS	McKenzie	63 min
Jul 15, 7:42 PM CDT	Severe Thunderstorm Warning	BIS	McHenry, McLean, Ward	63 min
Jul 15, 8:00 PM CDT	Severe Thunderstorm Warning	BIS	McLean, Mercer	60 min
Jul 15, 8:39 PM CDT	Severe Thunderstorm Warning	BIS	McHenry	66 min
Jul 16, 12:24 PM CDT	Severe Thunderstorm Warning	BIS	Logan, McIntosh	66 min
Jul 16, 1:19 PM CDT	Severe Thunderstorm Warning	BIS	Dickey, McIntosh	56 min
Jul 17, 4:50 PM CDT	Severe Thunderstorm Warning	FGF	Barnes, Cass	55 min
Jul 17, 5:26 PM CDT	Severe Thunderstorm Warning	BIS	Dickey, McIntosh	64 min
Jul 17, 5:37 PM CDT	Severe Thunderstorm Warning	FGF	Barnes, Cass, Traill	53 min
Jul 17, 5:53 PM CDT	Severe Thunderstorm Warning	BIS	Dickey, LaMoure	67 min
Jul 17, 6:32 PM CDT	Severe Thunderstorm Warning	FGF	Cass	42 min
Jul 17, 6:40 PM CDT	Severe Thunderstorm Warning	FGF	Cass	27 min
Jul 17, 6:59 PM CDT	Severe Thunderstorm Warning	FGF	Barnes, Cass	38 min
Jul 17, 7:05 PM CDT	Severe Thunderstorm Warning	BIS	Dickey	25 min
Jul 23, 4:45 PM CDT	Severe Thunderstorm Warning	BIS	Ward	60 min
Jul 23, 4:52 PM CDT	Severe Thunderstorm Warning	BIS	McLean	53 min
Jul 23, 5:15 PM CDT	Severe Thunderstorm Warning	BIS	McLean, Mercer	60 min
Jul 23, 5:28 PM CDT	Severe Thunderstorm Warning	BIS	Morton, Oliver	62 min
Jul 23, 5:41 PM CDT	Severe Thunderstorm Warning	BIS	McHenry, McLean, Ward	64 min
Jul 23, 6:07 PM CDT	Severe Thunderstorm Warning	BIS	McLean, Mercer	53 min
Jul 23, 7:01 PM CDT	Severe Thunderstorm Warning	BIS	McLean, Mercer, Sheridan	38 min
Jul 23, 7:04 PM CDT	Severe Thunderstorm Warning	BIS	Grant	56 min
Jul 23, 7:06 PM CDT	Severe Thunderstorm Warning	BIS	Pierce, Rolette	54 min
Jul 23, 7:11 PM CDT	Severe Thunderstorm Warning	BIS	Burleigh, McLean, Mercer, Oliver	64 min
Jul 23, 7:25 PM CDT	Severe Thunderstorm Warning	FGF	Towner	65 min
Jul 23, 8:00 PM CDT	Severe Thunderstorm Warning	BIS	Burleigh, McLean	60 min
Jul 23, 8:16 PM CDT	Severe Thunderstorm Warning	BIS	Burleigh, Kidder, Sheridan, Wells	59 min
Jul 23, 8:25 PM CDT	Severe Thunderstorm Warning	FGF	Cavalier, Ramsey, Towner	65 min
Jul 23, 8:38 PM CDT	Severe Thunderstorm Warning	FGF	Benson	67 min
Jul 23, 9:07 PM CDT	Severe Thunderstorm Warning	FGF	Cavalier, Pembina, Walsh	53 min
Jul 23, 9:13 PM CDT	Severe Thunderstorm Warning	BIS	Foster, Kidder, Stutsman, Wells	62 min
Jul 23, 9:23 PM CDT	Severe Thunderstorm Warning	FGF	Benson, Cavalier, Ramsey, Towner	52 min
Jul 23, 9:43 PM CDT	Severe Thunderstorm Warning	BIS	Foster, Stutsman	62 min
Jul 23, 9:54 PM CDT	Severe Thunderstorm Warning	FGF	Barnes, Benson, Eddy, Griggs, Nelson	66 min
Jul 23, 10:09 PM CDT	Severe Thunderstorm Warning	FGF	Benson, Cavalier, Eddy, Nelson, Pembina, Ramsey and 1 more	66 min
Jul 23, 10:16 PM CDT	Severe Thunderstorm Warning	BIS	LaMoure, Logan, Stutsman	59 min
Jul 23, 10:40 PM CDT	Severe Thunderstorm Warning	FGF	Barnes, Cass, Grand Forks, Griggs, Nelson, Steele and 1 more	65 min
Jul 23, 10:58 PM CDT	Severe Thunderstorm Warning	FGF	Barnes, Cass, Ransom	47 min
Jul 23, 11:40 PM CDT	Severe Thunderstorm Warning	FGF	Barnes, Cass, Grand Forks, Steele, Traill	65 min
Jul 24, 12:34 AM CDT	Severe Thunderstorm Warning	FGF	Cass	56 min
Jul 25, 4:22 PM CDT	Severe Thunderstorm Warning	BIS	Dickey, McIntosh	32 min
Jul 25, 8:00 PM CDT	Severe Thunderstorm Warning	BIS	McLean	60 min
Jul 26, 3:10 PM CDT	Severe Thunderstorm Warning	BIS	McKenzie, Mountrail	49 min
Jul 26, 3:44 PM CDT	Severe Thunderstorm Warning	BIS	Slope	61 min
Jul 26, 3:58 PM CDT	Severe Thunderstorm Warning	BIS	Burke, Mountrail, Williams	62 min
Jul 26, 4:37 PM CDT	Severe Thunderstorm Warning	BIS	Dunn	34 min
Jul 26, 4:45 PM CDT	Severe Thunderstorm Warning	BIS	Burke, Renville	26 min
Jul 26, 5:10 PM CDT	Severe Thunderstorm Warning	BIS	Billings, Dunn	65 min
Jul 26, 5:22 PM CDT	Severe Thunderstorm Warning	BIS	Bowman, Slope	53 min
Jul 26, 5:23 PM CDT	Severe Thunderstorm Warning	BIS	Billings, Stark	67 min
Jul 26, 6:16 PM CDT	Severe Thunderstorm Warning	BIS	Adams, Bowman, Slope	59 min
Jul 26, 6:17 PM CDT	Severe Thunderstorm Warning	BIS	Bottineau, Rolette	28 min
Jul 26, 6:41 PM CDT	Severe Thunderstorm Warning	BIS	Dunn, Stark	64 min
Jul 27, 6:38 PM CDT	Severe Thunderstorm Warning	BIS	Golden Valley, Slope	27 min
Jul 27, 8:38 PM CDT	Severe Thunderstorm Warning	BIS	McKenzie, Williams	67 min
Jul 27, 8:44 PM CDT	Severe Thunderstorm Warning	BIS	Adams, Grant, Hettinger	61 min
Jul 27, 9:24 PM CDT	Severe Thunderstorm Warning	BIS	Divide, Williams	66 min
Jul 27, 9:26 PM CDT	Severe Thunderstorm Warning	BIS	Billings, Bowman, Golden Valley, Slope, Stark	64 min
Jul 27, 9:39 PM CDT	Severe Thunderstorm Warning	BIS	Grant, Hettinger, Morton, Sioux	51 min
Jul 27, 9:52 PM CDT	Severe Thunderstorm Warning	BIS	Billings, Golden Valley	38 min
Jul 27, 10:27 PM CDT	Severe Thunderstorm Warning	BIS	Burleigh, Emmons, Grant, Morton, Sioux	48 min
Jul 27, 10:31 PM CDT	Severe Thunderstorm Warning	BIS	Billings, Dunn, Golden Valley, McKenzie	59 min
Aug 7, 5:01 PM CDT	Severe Thunderstorm Warning	BIS	Dickey, McIntosh	59 min
Aug 7, 5:29 PM CDT	Severe Thunderstorm Warning	BIS	LaMoure	31 min
Aug 7, 5:55 PM CDT	Severe Thunderstorm Warning	FGF	Barnes, Cass, Ransom, Richland	65 min
Aug 7, 6:01 PM CDT	Severe Thunderstorm Warning	FGF	Cass, Traill	44 min
Aug 7, 6:42 PM CDT	Severe Thunderstorm Warning	FGF	Cass	34 min
Aug 7, 7:40 PM CDT	Severe Thunderstorm Warning	FGF	Cass, Traill	65 min
Aug 12, 4:45 PM CDT	Severe Thunderstorm Warning	BIS	Grant, Morton	60 min
Aug 12, 5:45 PM CDT	Severe Thunderstorm Warning	BIS	Grant	60 min
Aug 15, 8:05 PM CDT	Severe Thunderstorm Warning	BIS	Stutsman	25 min
Aug 15, 8:10 PM CDT	Severe Thunderstorm Warning	FGF	Barnes	50 min
Aug 15, 8:56 PM CDT	Severe Thunderstorm Warning	FGF	Barnes, Cass	64 min
Aug 15, 9:48 PM CDT	Severe Thunderstorm Warning	FGF	Barnes, Cass, Ransom, Richland	57 min
Aug 22, 10:17 AM CDT	Severe Thunderstorm Warning	FGF	Cavalier, Pembina	58 min
Aug 28, 8:22 AM CDT	Severe Thunderstorm Warning	FGF	Pembina	53 min
Aug 28, 9:14 AM CDT	Severe Thunderstorm Warning	FGF	Pembina	31 min
Sep 4, 11:28 AM CDT	Severe Thunderstorm Warning	FGF	Cavalier, Pembina, Walsh	47 min
Sep 4, 12:42 PM CDT	Severe Thunderstorm Warning	FGF	Benson, Cavalier, Ramsey	27 min
Sep 5, 10:26 PM CDT	Severe Thunderstorm Warning	BIS	Golden Valley, McKenzie	64 min
Sep 5, 11:02 PM CDT	Severe Thunderstorm Warning	BIS	Billings, Golden Valley, Slope	58 min
Sep 5, 11:16 PM CDT	Severe Thunderstorm Warning	BIS	Billings, Golden Valley, McKenzie	59 min
Sep 6, 12:20 AM CDT	Severe Thunderstorm Warning	BIS	Dunn, Hettinger, Stark	55 min
Sep 6, 12:51 AM CDT	Severe Thunderstorm Warning	BIS	Dunn, Mercer, Morton, Oliver, Stark	54 min
Sep 6, 1:31 AM CDT	Severe Thunderstorm Warning	BIS	McLean, Mercer, Mountrail, Ward	44 min
Sep 6, 1:42 AM CDT	Severe Thunderstorm Warning	BIS	McLean, Mercer, Morton, Oliver	48 min
Sep 6, 1:57 AM CDT	Severe Thunderstorm Warning	BIS	Bottineau, McHenry, McLean, Mountrail, Renville, Ward	48 min
Sep 6, 2:33 AM CDT	Severe Thunderstorm Warning	BIS	Burleigh, McHenry, McLean, Sheridan	42 min
Sep 16, 9:12 PM CDT	Severe Thunderstorm Warning	BIS	Dunn, Stark	49 min
Sep 30, 6:57 PM CDT	Severe Thunderstorm Warning	BIS	Morton, Stark	63 min
Sep 30, 7:33 PM CDT	Severe Thunderstorm Warning	BIS	Grant, Hettinger, Stark	57 min
Oct 1, 3:04 AM CDT	Severe Thunderstorm Warning	BIS	Morton, Oliver	41 min
Oct 1, 3:47 AM CDT	Severe Thunderstorm Warning	BIS	Morton	43 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 2014 2016

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.