Alert archive / North Dakota / Severe Thunderstorm Warnings
Severe Thunderstorm Warnings in North Dakota, 2009
213 severe thunderstorm warnings in 2009. 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 2009. Tap one for its archive.
- Severe Thunderstorm Warnings
- 213
- Busiest month
- June79 severe thunderstorm warnings
- Busiest day
- June 18, 200919 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.
86 of 213 severe thunderstorm warnings covering North Dakota in 2009 had a qualifying storm report inside them; 123 of 187 hail, wind and damage reports fell inside a warning, on average 23 minutes after it went out.
North Dakota, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Severe thunderstorm warnings | 213 | 86 | 60% | 187 | 66% | 23 min |
Each office's whole area, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Bismarck, ND: severe thunderstorm warnings | 180 | 61 | 66% | 124 | 70% | 23 min |
| NWS Grand Forks, ND: severe thunderstorm warnings | 53 | 41 | 23% | 115 | 60% | 24 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 22, 9:54 AM CDT | Severe Thunderstorm Warning | BIS | Bottineau, McHenry, Renville, Rolette, Ward | 51 min |
| Mar 22, 10:33 AM CDT | Severe Thunderstorm Warning | BIS | Emmons | 57 min |
| Mar 22, 10:48 AM CDT | Severe Thunderstorm Warning | BIS | Bottineau, McHenry, Renville, Rolette, Ward | 57 min |
| Mar 22, 11:35 AM CDT | Severe Thunderstorm Warning | BIS | Burleigh, Emmons, Kidder, Logan | 55 min |
| Mar 22, 11:41 AM CDT | Severe Thunderstorm Warning | BIS | Bottineau, McHenry | 64 min |
| Mar 22, 12:11 PM CDT | Severe Thunderstorm Warning | BIS | Kidder, LaMoure, Logan, Stutsman | 19 min |
| Mar 22, 12:36 PM CDT | Severe Thunderstorm Warning | BIS | Foster, LaMoure, Stutsman | 54 min |
| Mar 22, 4:24 PM CDT | Severe Thunderstorm Warning | BIS | Billings, Golden Valley | 66 min |
| Mar 22, 5:42 PM CDT | Severe Thunderstorm Warning | BIS | Billings, Dunn | 29 min |
| Mar 23, 12:44 PM CDT | Severe Thunderstorm Warning | BIS | Emmons | 32 min |
| Apr 23, 5:58 PM CDT | Severe Thunderstorm Warning | BIS | Dickey | 21 min |
| May 5, 10:02 PM CDT | Severe Thunderstorm Warning | BIS | McKenzie, Williams | 58 min |
| May 11, 4:27 PM CDT | Severe Thunderstorm Warning | FGF | Grand Forks, Walsh | 34 min |
| May 12, 4:30 PM CDT | Severe Thunderstorm Warning | BIS | McLean, Mountrail, Ward | 45 min |
| May 12, 5:03 PM CDT | Severe Thunderstorm Warning | BIS | Dunn, Mercer, Stark | 57 min |
| May 12, 5:15 PM CDT | Severe Thunderstorm Warning | BIS | McHenry, Ward | 60 min |
| May 12, 5:46 PM CDT | Severe Thunderstorm Warning | BIS | McHenry, Ward | 29 min |
| May 12, 6:01 PM CDT | Severe Thunderstorm Warning | BIS | Adams, Grant, Hettinger, Sioux | 59 min |
| May 12, 6:04 PM CDT | Severe Thunderstorm Warning | BIS | Bottineau | 41 min |
| May 12, 6:06 PM CDT | Severe Thunderstorm Warning | BIS | Grant, Mercer, Morton, Oliver | 39 min |
| May 12, 6:27 PM CDT | Severe Thunderstorm Warning | BIS | Grant, Sioux | 63 min |
| May 12, 6:48 PM CDT | Severe Thunderstorm Warning | BIS | Grant, Morton, Oliver | 57 min |
| May 12, 7:03 PM CDT | Severe Thunderstorm Warning | BIS | Grant, Morton, Sioux | 57 min |
| May 12, 7:09 PM CDT | Severe Thunderstorm Warning | BIS | McHenry | 66 min |
| May 12, 7:28 PM CDT | Severe Thunderstorm Warning | BIS | Burleigh, Morton | 47 min |
| May 12, 7:35 PM CDT | Severe Thunderstorm Warning | BIS | Burleigh, Emmons, Morton, Sioux | 25 min |
| May 12, 9:30 PM CDT | Severe Thunderstorm Warning | BIS | Dickey, LaMoure | 32 min |
| May 13, 5:15 PM CDT | Severe Thunderstorm Warning | FGF | Richland | 60 min |
| May 28, 4:31 PM CDT | Severe Thunderstorm Warning | BIS | Emmons | 44 min |
| May 28, 5:16 PM CDT | Severe Thunderstorm Warning | BIS | Emmons, Logan, McIntosh | 44 min |
| Jun 15, 4:58 PM CDT | Severe Thunderstorm Warning | BIS | Emmons | 47 min |
| Jun 15, 5:43 PM CDT | Severe Thunderstorm Warning | BIS | Emmons | 36 min |
| Jun 15, 6:07 PM CDT | Severe Thunderstorm Warning | BIS | Hettinger | 38 min |
| Jun 15, 6:10 PM CDT | Severe Thunderstorm Warning | BIS | Burleigh | 50 min |
| Jun 15, 6:53 PM CDT | Severe Thunderstorm Warning | BIS | Burleigh | 52 min |
| Jun 15, 8:05 PM CDT | Severe Thunderstorm Warning | BIS | Morton | 55 min |
| Jun 15, 9:02 PM CDT | Severe Thunderstorm Warning | BIS | Burleigh | 58 min |
| Jun 17, 3:57 PM CDT | Severe Thunderstorm Warning | BIS | McKenzie | 48 min |
| Jun 18, 12:48 PM CDT | Severe Thunderstorm Warning | BIS | Grant, Sioux | 57 min |
| Jun 18, 1:12 PM CDT | Severe Thunderstorm Warning | BIS | LaMoure | 51 min |
| Jun 18, 2:23 PM CDT | Severe Thunderstorm Warning | FGF | Pembina | 52 min |
| Jun 18, 2:25 PM CDT | Severe Thunderstorm Warning | BIS | Renville, Ward | 35 min |
| Jun 18, 2:55 PM CDT | Severe Thunderstorm Warning | FGF | Cavalier | 65 min |
| Jun 18, 2:59 PM CDT | Severe Thunderstorm Warning | BIS | McIntosh | 61 min |
| Jun 18, 3:16 PM CDT | Severe Thunderstorm Warning | FGF | Pembina | 42 min |
| Jun 18, 3:23 PM CDT | Severe Thunderstorm Warning | FGF | Barnes, Ransom | 41 min |
| Jun 18, 3:41 PM CDT | Severe Thunderstorm Warning | BIS | Dickey | 64 min |
| Jun 18, 3:58 PM CDT | Severe Thunderstorm Warning | BIS | Dickey, LaMoure, Logan | 62 min |
| Jun 18, 4:17 PM CDT | Severe Thunderstorm Warning | BIS | Dickey, LaMoure | 58 min |
| Jun 18, 4:19 PM CDT | Severe Thunderstorm Warning | FGF | Cass, Ransom, Richland | 56 min |
| Jun 18, 4:26 PM CDT | Severe Thunderstorm Warning | FGF | Ransom, Sargent | 64 min |
| Jun 18, 4:46 PM CDT | Severe Thunderstorm Warning | FGF | Cass, Richland | 59 min |
| Jun 18, 4:48 PM CDT | Severe Thunderstorm Warning | BIS | Bottineau | 42 min |
| Jun 18, 4:58 PM CDT | Severe Thunderstorm Warning | BIS | Ward | 62 min |
| Jun 18, 5:02 PM CDT | Severe Thunderstorm Warning | FGF | Ransom, Richland, Sargent | 58 min |
| Jun 18, 5:56 PM CDT | Severe Thunderstorm Warning | BIS | Rolette | 49 min |
| Jun 18, 6:45 PM CDT | Severe Thunderstorm Warning | BIS | Bottineau, Rolette | 51 min |
| Jun 21, 7:40 PM CDT | Severe Thunderstorm Warning | BIS | Mountrail, Williams | 50 min |
| Jun 22, 3:29 PM CDT | Severe Thunderstorm Warning | BIS | Dunn, Mercer | 61 min |
| Jun 22, 3:34 PM CDT | Severe Thunderstorm Warning | BIS | Adams, Bowman | 56 min |
| Jun 22, 3:43 PM CDT | Severe Thunderstorm Warning | BIS | McLean, Mercer | 62 min |
| Jun 22, 4:18 PM CDT | Severe Thunderstorm Warning | BIS | Mercer, Oliver | 42 min |
| Jun 22, 4:30 PM CDT | Severe Thunderstorm Warning | BIS | Adams | 45 min |
| Jun 22, 5:00 PM CDT | Severe Thunderstorm Warning | BIS | Grant, Sioux | 60 min |
| Jun 22, 5:05 PM CDT | Severe Thunderstorm Warning | BIS | Grant | 55 min |
| Jun 22, 5:28 PM CDT | Severe Thunderstorm Warning | BIS | Renville, Ward | 47 min |
| Jun 22, 5:30 PM CDT | Severe Thunderstorm Warning | BIS | Burleigh, McLean, Oliver, Sheridan | 60 min |
| Jun 22, 5:40 PM CDT | Severe Thunderstorm Warning | BIS | Grant, Morton | 65 min |
| Jun 22, 6:37 PM CDT | Severe Thunderstorm Warning | BIS | Emmons, Morton, Sioux | 38 min |
| Jun 22, 7:12 PM CDT | Severe Thunderstorm Warning | BIS | Emmons | 48 min |
| Jun 22, 7:30 PM CDT | Severe Thunderstorm Warning | BIS | Emmons, Logan, McIntosh | 28 min |
| Jun 24, 8:14 AM CDT | Severe Thunderstorm Warning | BIS | Hettinger, Slope | 22 min |
| Jun 24, 8:21 AM CDT | Severe Thunderstorm Warning | BIS | Bowman, Slope | 39 min |
| Jun 24, 8:45 AM CDT | Severe Thunderstorm Warning | BIS | Adams, Hettinger, Slope | 60 min |
| Jun 24, 3:54 PM CDT | Severe Thunderstorm Warning | BIS | McKenzie | 66 min |
| Jun 24, 4:34 PM CDT | Severe Thunderstorm Warning | BIS | Billings, Golden Valley | 41 min |
| Jun 24, 5:01 PM CDT | Severe Thunderstorm Warning | BIS | Dunn, McKenzie | 59 min |
| Jun 24, 5:14 PM CDT | Severe Thunderstorm Warning | BIS | Billings, Golden Valley, Stark | 46 min |
| Jun 24, 5:17 PM CDT | Severe Thunderstorm Warning | BIS | Bottineau, Renville | 58 min |
| Jun 24, 5:59 PM CDT | Severe Thunderstorm Warning | BIS | Billings, Hettinger, Slope, Stark | 46 min |
| Jun 24, 6:41 PM CDT | Severe Thunderstorm Warning | BIS | Dunn | 64 min |
| Jun 24, 6:44 PM CDT | Severe Thunderstorm Warning | BIS | Billings, Hettinger, Slope, Stark | 46 min |
| Jun 24, 6:57 PM CDT | Severe Thunderstorm Warning | BIS | Adams | 63 min |
| Jun 24, 8:26 PM CDT | Severe Thunderstorm Warning | BIS | Adams, Grant, Hettinger, Sioux | 13 min |
| Jun 25, 9:05 PM CDT | Severe Thunderstorm Warning | BIS | McKenzie, Williams | 55 min |
| Jun 26, 1:09 AM CDT | Severe Thunderstorm Warning | BIS | McKenzie, Mountrail, Williams | 66 min |
| Jun 26, 12:20 PM CDT | Severe Thunderstorm Warning | FGF | Cavalier, Ramsey, Towner | 40 min |
| Jun 26, 2:39 PM CDT | Severe Thunderstorm Warning | BIS | Rolette | 32 min |
| Jun 26, 5:00 PM CDT | Severe Thunderstorm Warning | BIS | Hettinger, Slope, Stark | 60 min |
| Jun 26, 5:15 PM CDT | Severe Thunderstorm Warning | FGF | Nelson, Walsh | 60 min |
| Jun 26, 5:41 PM CDT | Severe Thunderstorm Warning | BIS | Dunn | 34 min |
| Jun 26, 5:47 PM CDT | Severe Thunderstorm Warning | BIS | McLean, Mercer | 58 min |
| Jun 26, 6:22 PM CDT | Severe Thunderstorm Warning | BIS | Dunn, McLean, Mercer | 53 min |
| Jun 26, 6:25 PM CDT | Severe Thunderstorm Warning | FGF | Grand Forks, Pembina, Walsh | 65 min |
| Jun 26, 7:12 PM CDT | Severe Thunderstorm Warning | BIS | Grant, Morton | 63 min |
| Jun 26, 7:17 PM CDT | Severe Thunderstorm Warning | BIS | McLean, Mercer | 58 min |
| Jun 26, 7:37 PM CDT | Severe Thunderstorm Warning | BIS | McLean | 38 min |
| Jun 26, 7:43 PM CDT | Severe Thunderstorm Warning | BIS | Burleigh, Grant, Morton | 62 min |
| Jun 26, 8:08 PM CDT | Severe Thunderstorm Warning | BIS | Burleigh, Emmons, Grant, Kidder, McHenry, McLean and 8 more | 52 min |
| Jun 27, 1:24 PM CDT | Severe Thunderstorm Warning | FGF | Cavalier, Ramsey, Towner | 51 min |
| Jun 27, 2:54 PM CDT | Severe Thunderstorm Warning | BIS | McHenry | 36 min |
| Jun 27, 2:58 PM CDT | Severe Thunderstorm Warning | BIS | Grant, Morton, Sioux | 43 min |
| Jun 27, 3:15 PM CDT | Severe Thunderstorm Warning | BIS | Rolette | 50 min |
| Jun 27, 3:22 PM CDT | Severe Thunderstorm Warning | FGF | Ramsey, Towner | 53 min |
| Jun 30, 4:47 PM CDT | Severe Thunderstorm Warning | BIS | McKenzie, Williams | 58 min |
| Jun 30, 6:08 PM CDT | Severe Thunderstorm Warning | BIS | McKenzie | 52 min |
| Jun 30, 6:12 PM CDT | Severe Thunderstorm Warning | BIS | Golden Valley, McKenzie | 47 min |
| Jun 30, 6:15 PM CDT | Severe Thunderstorm Warning | BIS | Golden Valley | 60 min |
| Jun 30, 6:28 PM CDT | Severe Thunderstorm Warning | BIS | McKenzie, Williams | 48 min |
| Jun 30, 7:07 PM CDT | Severe Thunderstorm Warning | BIS | Golden Valley, Slope | 53 min |
| Jun 30, 7:48 PM CDT | Severe Thunderstorm Warning | BIS | Golden Valley, Slope | 57 min |
| Jun 30, 8:44 PM CDT | Severe Thunderstorm Warning | BIS | Bowman, Slope | 61 min |
| Jul 2, 6:17 AM CDT | Severe Thunderstorm Warning | BIS | Bottineau | 58 min |
| Jul 2, 2:26 PM CDT | Severe Thunderstorm Warning | BIS | Adams | 52 min |
| Jul 2, 5:24 PM CDT | Severe Thunderstorm Warning | BIS | McIntosh | 36 min |
| Jul 3, 8:59 PM CDT | Severe Thunderstorm Warning | BIS | McKenzie, Williams | 61 min |
| Jul 3, 9:54 PM CDT | Severe Thunderstorm Warning | BIS | McKenzie, Williams | 66 min |
| Jul 5, 4:03 PM CDT | Severe Thunderstorm Warning | BIS | Billings, Golden Valley, McKenzie | 42 min |
| Jul 5, 4:25 PM CDT | Severe Thunderstorm Warning | BIS | Billings, Golden Valley | 50 min |
| Jul 5, 4:49 PM CDT | Severe Thunderstorm Warning | BIS | Billings, Golden Valley, Slope | 56 min |
| Jul 5, 5:31 PM CDT | Severe Thunderstorm Warning | BIS | Billings, Golden Valley, Slope | 59 min |
| Jul 5, 5:47 PM CDT | Severe Thunderstorm Warning | BIS | Billings, Dunn, Stark | 29 min |
| Jul 6, 4:10 PM CDT | Severe Thunderstorm Warning | BIS | McIntosh | 38 min |
| Jul 8, 5:41 PM CDT | Severe Thunderstorm Warning | BIS | Divide | 40 min |
| Jul 8, 6:19 PM CDT | Severe Thunderstorm Warning | BIS | Burke, Divide | 41 min |
| Jul 8, 6:19 PM CDT | Severe Thunderstorm Warning | BIS | Billings, Golden Valley | 56 min |
| Jul 8, 6:28 PM CDT | Severe Thunderstorm Warning | BIS | Billings, Golden Valley, McKenzie | 40 min |
| Jul 8, 6:56 PM CDT | Severe Thunderstorm Warning | BIS | Burke, Divide | 64 min |
| Jul 8, 7:01 PM CDT | Severe Thunderstorm Warning | BIS | Billings, Golden Valley, McKenzie | 59 min |
| Jul 8, 7:19 PM CDT | Severe Thunderstorm Warning | BIS | Adams, Billings, Bowman, Dunn, Golden Valley, Slope and 1 more | 56 min |
| Jul 8, 7:56 PM CDT | Severe Thunderstorm Warning | BIS | Adams, Billings, Bowman, Dunn, Golden Valley, Hettinger and 6 more | 64 min |
| Jul 8, 7:56 PM CDT | Severe Thunderstorm Warning | BIS | Bottineau, Burke, Renville, Ward | 64 min |
| Jul 8, 8:26 PM CDT | Severe Thunderstorm Warning | BIS | Burke, Divide, Williams | 64 min |
| Jul 8, 8:58 PM CDT | Severe Thunderstorm Warning | BIS | Adams, Billings, Bowman, Dunn, Golden Valley, Grant and 10 more | 62 min |
| Jul 8, 9:16 PM CDT | Severe Thunderstorm Warning | BIS | Bottineau, Burke, Mountrail, Renville, Ward | 10 min |
| Jul 8, 9:54 PM CDT | Severe Thunderstorm Warning | BIS | Adams, Dunn, Grant, Hettinger, McLean, Mercer and 4 more | 66 min |
| Jul 8, 10:07 PM CDT | Severe Thunderstorm Warning | BIS | Emmons, Logan, McIntosh | 53 min |
| Jul 8, 10:55 PM CDT | Severe Thunderstorm Warning | BIS | Burleigh, Emmons, McLean, Mercer, Morton, Oliver and 1 more | 65 min |
| Jul 8, 10:58 PM CDT | Severe Thunderstorm Warning | BIS | Adams, Emmons, Grant, Hettinger, Morton, Sioux and 1 more | 62 min |
| Jul 9, 1:09 AM CDT | Severe Thunderstorm Warning | BIS | Burleigh, Kidder | 66 min |
| Jul 11, 6:45 PM CDT | Severe Thunderstorm Warning | BIS | Dunn, Stark | 60 min |
| Jul 11, 8:13 PM CDT | Severe Thunderstorm Warning | BIS | Grant, Hettinger | 62 min |
| Jul 11, 8:38 PM CDT | Severe Thunderstorm Warning | BIS | Burke, Divide, Mountrail | 52 min |
| Jul 11, 10:44 PM CDT | Severe Thunderstorm Warning | BIS | McLean, Mountrail, Ward | 20 min |
| Jul 11, 11:12 PM CDT | Severe Thunderstorm Warning | BIS | McLean, Mercer | 63 min |
| Jul 11, 11:48 PM CDT | Severe Thunderstorm Warning | BIS | McLean, Mercer, Oliver | 57 min |
| Jul 12, 12:29 AM CDT | Severe Thunderstorm Warning | BIS | Burleigh, McLean, Mercer, Morton, Oliver, Sheridan | 38 min |
| Jul 12, 1:49 AM CDT | Severe Thunderstorm Warning | BIS | Burleigh, Emmons, Kidder, Logan, McIntosh, Morton and 1 more | 56 min |
| Jul 12, 2:41 AM CDT | Severe Thunderstorm Warning | BIS | Dickey, Emmons, Kidder, LaMoure, Logan, McIntosh | 64 min |
| Jul 13, 6:08 AM CDT | Severe Thunderstorm Warning | BIS | Adams | 67 min |
| Jul 13, 7:09 AM CDT | Severe Thunderstorm Warning | BIS | Adams, Grant, Sioux | 51 min |
| Jul 13, 10:21 AM CDT | Severe Thunderstorm Warning | BIS | Grant, Sioux | 34 min |
| Jul 19, 6:42 PM CDT | Severe Thunderstorm Warning | BIS | Adams, Bowman | 63 min |
| Jul 19, 7:09 PM CDT | Severe Thunderstorm Warning | BIS | Dunn | 66 min |
| Jul 19, 7:44 PM CDT | Severe Thunderstorm Warning | BIS | Dunn, McLean, Mercer | 61 min |
| Jul 19, 8:17 PM CDT | Severe Thunderstorm Warning | BIS | Dunn, Mercer | 58 min |
| Jul 19, 11:44 PM CDT | Severe Thunderstorm Warning | BIS | McHenry, Pierce | 44 min |
| Jul 19, 11:59 PM CDT | Severe Thunderstorm Warning | FGF | Towner | 61 min |
| Jul 20, 12:08 AM CDT | Severe Thunderstorm Warning | FGF | Benson | 67 min |
| Jul 20, 12:27 AM CDT | Severe Thunderstorm Warning | FGF | Benson, Towner | 63 min |
| Jul 20, 12:43 AM CDT | Severe Thunderstorm Warning | FGF | Benson, Ramsey, Towner | 62 min |
| Jul 20, 1:10 AM CDT | Severe Thunderstorm Warning | FGF | Cavalier | 65 min |
| Jul 20, 2:14 AM CDT | Severe Thunderstorm Warning | FGF | Cavalier | 46 min |
| Jul 20, 6:09 AM CDT | Severe Thunderstorm Warning | FGF | Cass, Traill | 47 min |
| Jul 20, 1:12 PM CDT | Severe Thunderstorm Warning | FGF | Cass, Ransom | 48 min |
| Jul 23, 4:29 PM CDT | Severe Thunderstorm Warning | BIS | Burleigh, McLean, Sheridan | 61 min |
| Jul 23, 6:10 PM CDT | Severe Thunderstorm Warning | BIS | Kidder | 44 min |
| Jul 23, 8:11 PM CDT | Severe Thunderstorm Warning | FGF | Pembina, Walsh | 64 min |
| Jul 23, 8:46 PM CDT | Severe Thunderstorm Warning | FGF | Grand Forks, Steele, Traill | 59 min |
| Aug 7, 10:57 PM CDT | Severe Thunderstorm Warning | BIS | Bowman | 63 min |
| Aug 7, 11:57 PM CDT | Severe Thunderstorm Warning | BIS | Adams, Bowman | 48 min |
| Aug 14, 12:32 AM CDT | Severe Thunderstorm Warning | BIS | Dunn, McKenzie, Mountrail | 58 min |
| Aug 14, 1:31 AM CDT | Severe Thunderstorm Warning | BIS | Dunn, McKenzie, McLean, Mountrail | 59 min |
| Aug 14, 1:54 AM CDT | Severe Thunderstorm Warning | BIS | Dunn, McKenzie, McLean, Mountrail | 51 min |
| Aug 14, 2:59 AM CDT | Severe Thunderstorm Warning | BIS | Ward | 61 min |
| Aug 14, 3:35 AM CDT | Severe Thunderstorm Warning | BIS | Bottineau, McHenry, Renville | 55 min |
| Aug 14, 3:42 AM CDT | Severe Thunderstorm Warning | BIS | Dunn, McKenzie, Mountrail | 48 min |
| Aug 14, 4:07 AM CDT | Severe Thunderstorm Warning | BIS | Bottineau, Rolette | 33 min |
| Aug 14, 4:30 AM CDT | Severe Thunderstorm Warning | BIS | McLean, Mountrail, Ward | 45 min |
| Aug 14, 5:16 AM CDT | Severe Thunderstorm Warning | BIS | McLean, Mercer | 41 min |
| Aug 14, 6:29 AM CDT | Severe Thunderstorm Warning | BIS | McHenry, Pierce, Sheridan, Wells | 46 min |
| Aug 14, 6:47 AM CDT | Severe Thunderstorm Warning | FGF | Benson | 58 min |
| Aug 14, 7:30 AM CDT | Severe Thunderstorm Warning | FGF | Benson, Eddy, Ramsey | 60 min |
| Aug 14, 8:14 AM CDT | Severe Thunderstorm Warning | FGF | Benson, Cavalier, Nelson, Ramsey, Walsh | 61 min |
| Aug 14, 8:20 AM CDT | Severe Thunderstorm Warning | FGF | Grand Forks, Nelson | 55 min |
| Aug 14, 8:53 AM CDT | Severe Thunderstorm Warning | FGF | Grand Forks, Nelson, Steele, Traill, Walsh | 52 min |
| Aug 14, 9:39 AM CDT | Severe Thunderstorm Warning | FGF | Grand Forks | 66 min |
| Aug 14, 4:58 PM CDT | Severe Thunderstorm Warning | BIS | Dickey, McIntosh | 62 min |
| Aug 14, 5:43 PM CDT | Severe Thunderstorm Warning | BIS | Kidder, Stutsman | 62 min |
| Aug 14, 6:17 PM CDT | Severe Thunderstorm Warning | BIS | Kidder, Stutsman | 58 min |
| Aug 14, 7:11 PM CDT | Severe Thunderstorm Warning | FGF | Ransom, Sargent | 36 min |
| Aug 23, 11:30 PM CDT | Severe Thunderstorm Warning | BIS | McKenzie, Williams | 60 min |
| Aug 24, 12:08 AM CDT | Severe Thunderstorm Warning | BIS | McKenzie | 52 min |
| Aug 24, 12:29 AM CDT | Severe Thunderstorm Warning | BIS | McKenzie, Williams | 61 min |
| Aug 24, 12:58 AM CDT | Severe Thunderstorm Warning | BIS | McKenzie | 32 min |
| Aug 24, 1:15 AM CDT | Severe Thunderstorm Warning | BIS | Burke, Divide, McKenzie, Mountrail, Williams | 60 min |
| Aug 24, 2:15 AM CDT | Severe Thunderstorm Warning | BIS | Burke, Mountrail, Renville, Ward | 60 min |
| Aug 24, 5:22 AM CDT | Severe Thunderstorm Warning | FGF | Cavalier, Towner | 53 min |
| Sep 8, 12:55 AM CDT | Severe Thunderstorm Warning | BIS | Bowman, Slope | 50 min |
| Sep 8, 1:34 AM CDT | Severe Thunderstorm Warning | BIS | Adams, Bowman, Hettinger, Slope | 41 min |
| Sep 8, 2:14 AM CDT | Severe Thunderstorm Warning | BIS | Dunn, Stark | 46 min |
| Sep 8, 2:38 AM CDT | Severe Thunderstorm Warning | BIS | Dunn, Grant, Mercer, Morton, Oliver, Stark | 67 min |
| Sep 8, 3:23 AM CDT | Severe Thunderstorm Warning | BIS | Morton, Oliver | 37 min |
| Sep 8, 4:09 AM CDT | Severe Thunderstorm Warning | BIS | McHenry, McLean, Sheridan, Ward | 51 min |
| Sep 10, 7:46 PM CDT | Severe Thunderstorm Warning | BIS | McLean, Ward | 44 min |
| Sep 10, 8:28 PM CDT | Severe Thunderstorm Warning | BIS | McLean | 62 min |
| Sep 10, 9:06 PM CDT | Severe Thunderstorm Warning | BIS | McLean, Sheridan | 39 min |
| Sep 10, 9:19 PM CDT | Severe Thunderstorm Warning | BIS | Burleigh, McLean, Oliver | 56 min |
| Sep 10, 9:26 PM CDT | Severe Thunderstorm Warning | BIS | Morton, Oliver | 54 min |
| Sep 10, 10:12 PM CDT | Severe Thunderstorm Warning | BIS | Burleigh, McLean, Oliver, Sheridan | 63 min |
| Sep 10, 10:26 PM CDT | Severe Thunderstorm Warning | BIS | Burleigh, Morton | 64 min |
| Sep 10, 10:50 PM CDT | Severe Thunderstorm Warning | BIS | Burleigh, Sheridan, Wells | 42 min |
| Sep 10, 11:00 PM CDT | Severe Thunderstorm Warning | BIS | Grant, Sioux | 60 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- McLean County28
- McKenzie County26
- Dunn County22
- Grant County22
- Morton County22
- Mercer County19
- Burleigh County18
- Ward County17
- Emmons County17
- Billings County17
- Golden Valley County17
- Adams County17
- Sioux County16
- Slope County16
- Mountrail County15
- Oliver County15
- Williams County14
- Stark County14
- Hettinger County14
- Bottineau County12
- McHenry County12
- Bowman County11
- Sheridan County10
- Renville County9
- Kidder County9
- McIntosh County9
- Logan County8
- Burke County8
- Rolette County7
- LaMoure County7
- Dickey County7
- Cavalier County7
- Towner County7
- Grand Forks County6
- Walsh County6
- Ransom County6
- Ramsey County6
- Divide County6
- Benson County6
- Stutsman County4
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20082010
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.