Alert archive / North Dakota / Severe Thunderstorm Warnings
Severe Thunderstorm Warnings in North Dakota, 2014
178 severe thunderstorm warnings in 2014. 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 2014. Tap one for its archive.
- Severe Thunderstorm Warnings
- 178
- Busiest month
- July60 severe thunderstorm warnings
- Busiest day
- September 4, 201424 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.
126 of 178 severe thunderstorm warnings covering North Dakota in 2014 had a qualifying storm report inside them; 263 of 325 hail, wind and damage reports fell inside a warning, on average 24 minutes after it went out.
North Dakota, 2014
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Severe thunderstorm warnings | 178 | 126 | 29% | 325 | 81% | 24 min |
Each office's whole area, 2014
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Grand Forks, ND: severe thunderstorm warnings | 74 | 73 | 1% | 240 | 76% | 24 min |
| NWS Bismarck, ND: severe thunderstorm warnings | 136 | 84 | 38% | 203 | 83% | 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 |
|---|---|---|---|---|
| May 19, 3:28 AM CDT | Severe Thunderstorm Warning | BIS | Dickey, LaMoure | 47 min |
| May 23, 3:46 PM CDT | Severe Thunderstorm Warning | BIS | Stutsman | 59 min |
| May 23, 4:31 PM CDT | Severe Thunderstorm Warning | BIS | Stutsman | 59 min |
| May 23, 4:49 PM CDT | Severe Thunderstorm Warning | BIS | Stutsman | 56 min |
| May 23, 5:51 PM CDT | Severe Thunderstorm Warning | BIS | Stutsman | 54 min |
| May 23, 6:56 PM CDT | Severe Thunderstorm Warning | BIS | Kidder | 64 min |
| May 25, 5:34 PM CDT | Severe Thunderstorm Warning | BIS | Dickey, LaMoure | 56 min |
| May 26, 4:24 PM CDT | Severe Thunderstorm Warning | BIS | Divide, Williams | 66 min |
| May 26, 5:14 PM CDT | Severe Thunderstorm Warning | BIS | McKenzie, Williams | 46 min |
| May 26, 5:29 PM CDT | Severe Thunderstorm Warning | BIS | Divide, Williams | 61 min |
| May 26, 6:00 PM CDT | Severe Thunderstorm Warning | BIS | McKenzie | 60 min |
| May 26, 6:29 PM CDT | Severe Thunderstorm Warning | BIS | Williams | 61 min |
| May 26, 6:59 PM CDT | Severe Thunderstorm Warning | BIS | McKenzie | 61 min |
| May 26, 7:59 PM CDT | Severe Thunderstorm Warning | BIS | Dunn, McKenzie | 61 min |
| May 26, 9:01 PM CDT | Severe Thunderstorm Warning | BIS | Dunn | 59 min |
| May 26, 9:02 PM CDT | Severe Thunderstorm Warning | BIS | Dunn, McKenzie | 58 min |
| May 26, 9:58 PM CDT | Severe Thunderstorm Warning | BIS | Dunn, McLean, Mercer | 62 min |
| May 26, 10:57 PM CDT | Severe Thunderstorm Warning | BIS | Dunn, Mercer, Morton, Oliver, Stark | 63 min |
| May 26, 11:53 PM CDT | Severe Thunderstorm Warning | BIS | Grant, Hettinger, Mercer, Morton, Oliver, Stark | 67 min |
| May 27, 12:14 AM CDT | Severe Thunderstorm Warning | BIS | Billings, Slope, Stark | 61 min |
| May 28, 7:27 AM CDT | Severe Thunderstorm Warning | BIS | Billings, Golden Valley | 33 min |
| May 29, 4:34 PM CDT | Severe Thunderstorm Warning | BIS | Hettinger, Slope, Stark | 56 min |
| May 29, 5:20 PM CDT | Severe Thunderstorm Warning | BIS | Dunn, Mercer, Stark | 55 min |
| May 29, 5:34 PM CDT | Severe Thunderstorm Warning | BIS | Adams, Hettinger, Stark | 56 min |
| May 29, 8:03 PM CDT | Severe Thunderstorm Warning | BIS | Dunn | 27 min |
| May 29, 8:33 PM CDT | Severe Thunderstorm Warning | BIS | Dunn, Mercer | 27 min |
| May 29, 8:53 PM CDT | Severe Thunderstorm Warning | BIS | Mercer, Oliver | 37 min |
| May 29, 10:22 PM CDT | Severe Thunderstorm Warning | BIS | McLean, Ward | 23 min |
| May 31, 9:41 PM CDT | Severe Thunderstorm Warning | BIS | Williams | 64 min |
| May 31, 10:38 PM CDT | Severe Thunderstorm Warning | BIS | Bowman | 67 min |
| Jun 4, 5:29 PM CDT | Severe Thunderstorm Warning | BIS | Bottineau, Renville | 51 min |
| Jun 4, 5:55 PM CDT | Severe Thunderstorm Warning | BIS | McHenry, Ward | 65 min |
| Jun 4, 6:02 PM CDT | Severe Thunderstorm Warning | BIS | Adams | 43 min |
| Jun 4, 7:31 PM CDT | Severe Thunderstorm Warning | BIS | Grant, Morton | 26 min |
| Jun 4, 7:36 PM CDT | Severe Thunderstorm Warning | BIS | Grant, Sioux | 33 min |
| Jun 4, 7:59 PM CDT | Severe Thunderstorm Warning | FGF | Cavalier, Towner | 61 min |
| Jun 4, 8:15 PM CDT | Severe Thunderstorm Warning | BIS | McHenry | 26 min |
| Jun 5, 3:51 PM CDT | Severe Thunderstorm Warning | FGF | Sargent | 39 min |
| Jun 8, 11:52 PM CDT | Severe Thunderstorm Warning | FGF | Towner | 23 min |
| Jun 11, 3:27 PM CDT | Severe Thunderstorm Warning | BIS | McIntosh | 63 min |
| Jun 11, 4:14 PM CDT | Severe Thunderstorm Warning | BIS | Dickey, McIntosh | 61 min |
| Jun 13, 6:58 PM CDT | Severe Thunderstorm Warning | BIS | Bowman, Slope | 19 min |
| Jun 13, 8:16 PM CDT | Severe Thunderstorm Warning | BIS | McKenzie | 31 min |
| Jun 13, 9:08 PM CDT | Severe Thunderstorm Warning | BIS | Williams | 67 min |
| Jun 13, 10:36 PM CDT | Severe Thunderstorm Warning | BIS | Mountrail, Williams | 54 min |
| Jun 16, 7:57 PM CDT | Severe Thunderstorm Warning | BIS | Stark | 63 min |
| Jun 16, 8:01 PM CDT | Severe Thunderstorm Warning | BIS | Billings, Golden Valley | 59 min |
| Jun 16, 9:00 PM CDT | Severe Thunderstorm Warning | BIS | Stark | 60 min |
| Jun 16, 10:15 PM CDT | Severe Thunderstorm Warning | BIS | Hettinger, Stark | 45 min |
| Jun 16, 11:09 PM CDT | Severe Thunderstorm Warning | BIS | Grant, Hettinger, Morton, Stark | 66 min |
| Jun 16, 11:26 PM CDT | Severe Thunderstorm Warning | BIS | Hettinger | 64 min |
| Jun 18, 3:35 PM CDT | Severe Thunderstorm Warning | BIS | Grant, Sioux | 55 min |
| Jun 18, 4:13 PM CDT | Severe Thunderstorm Warning | BIS | Emmons, Morton, Sioux | 62 min |
| Jun 18, 6:51 PM CDT | Severe Thunderstorm Warning | BIS | McIntosh | 39 min |
| Jun 18, 9:09 PM CDT | Severe Thunderstorm Warning | BIS | Dickey, LaMoure | 66 min |
| Jun 18, 9:14 PM CDT | Severe Thunderstorm Warning | BIS | Foster, Kidder, Stutsman, Wells | 61 min |
| Jun 18, 10:34 PM CDT | Severe Thunderstorm Warning | FGF | Barnes, Ransom | 26 min |
| Jun 18, 11:03 PM CDT | Severe Thunderstorm Warning | FGF | Barnes, Cass, Ransom | 27 min |
| Jun 21, 2:55 PM CDT | Severe Thunderstorm Warning | BIS | Emmons | 45 min |
| Jun 21, 2:59 PM CDT | Severe Thunderstorm Warning | FGF | Barnes, Cass | 61 min |
| Jun 21, 3:28 PM CDT | Severe Thunderstorm Warning | FGF | Cass, Traill | 62 min |
| Jun 21, 3:57 PM CDT | Severe Thunderstorm Warning | FGF | Cass, Steele, Traill | 49 min |
| Jun 21, 4:32 PM CDT | Severe Thunderstorm Warning | BIS | Dickey, McIntosh | 58 min |
| Jun 21, 4:32 PM CDT | Severe Thunderstorm Warning | FGF | Cass | 43 min |
| Jun 21, 4:38 PM CDT | Severe Thunderstorm Warning | FGF | Traill | 32 min |
| Jun 21, 6:10 PM CDT | Severe Thunderstorm Warning | FGF | Barnes | 65 min |
| Jun 21, 6:16 PM CDT | Severe Thunderstorm Warning | FGF | Sargent | 59 min |
| Jun 21, 6:22 PM CDT | Severe Thunderstorm Warning | BIS | LaMoure, Stutsman | 40 min |
| Jun 21, 7:49 PM CDT | Severe Thunderstorm Warning | FGF | Traill | 26 min |
| Jun 25, 10:01 PM CDT | Severe Thunderstorm Warning | BIS | Adams, Bowman | 26 min |
| Jun 25, 10:03 PM CDT | Severe Thunderstorm Warning | BIS | Grant, Morton | 57 min |
| Jun 25, 10:30 PM CDT | Severe Thunderstorm Warning | BIS | Morton | 38 min |
| Jun 26, 9:43 PM CDT | Severe Thunderstorm Warning | BIS | Golden Valley, McKenzie | 62 min |
| Jul 4, 11:30 AM CDT | Severe Thunderstorm Warning | FGF | Cavalier, Pembina, Walsh | 60 min |
| Jul 4, 11:48 AM CDT | Severe Thunderstorm Warning | FGF | Pembina, Walsh | 42 min |
| Jul 4, 12:43 PM CDT | Severe Thunderstorm Warning | FGF | Pembina | 21 min |
| Jul 5, 5:43 PM CDT | Severe Thunderstorm Warning | BIS | Adams, Hettinger | 62 min |
| Jul 5, 6:15 PM CDT | Severe Thunderstorm Warning | BIS | Hettinger | 30 min |
| Jul 5, 6:40 PM CDT | Severe Thunderstorm Warning | BIS | Grant, Hettinger | 65 min |
| Jul 5, 7:10 PM CDT | Severe Thunderstorm Warning | BIS | Grant, Morton | 65 min |
| Jul 5, 8:13 PM CDT | Severe Thunderstorm Warning | BIS | Burleigh, Emmons, Morton | 62 min |
| Jul 5, 9:10 PM CDT | Severe Thunderstorm Warning | BIS | Emmons, Kidder, Logan, Stutsman | 65 min |
| Jul 5, 9:49 PM CDT | Severe Thunderstorm Warning | BIS | Kidder, Stutsman | 56 min |
| Jul 5, 10:09 PM CDT | Severe Thunderstorm Warning | BIS | LaMoure, Stutsman | 14 min |
| Jul 5, 10:55 PM CDT | Severe Thunderstorm Warning | FGF | Steele, Traill | 65 min |
| Jul 5, 11:31 PM CDT | Severe Thunderstorm Warning | FGF | Traill | 44 min |
| Jul 5, 11:42 PM CDT | Severe Thunderstorm Warning | FGF | Cass, Steele, Traill | 48 min |
| Jul 6, 12:07 AM CDT | Severe Thunderstorm Warning | FGF | Cass | 53 min |
| Jul 6, 12:22 AM CDT | Severe Thunderstorm Warning | FGF | Cass | 53 min |
| Jul 6, 12:58 AM CDT | Severe Thunderstorm Warning | FGF | Cavalier, Pembina | 62 min |
| Jul 6, 1:02 AM CDT | Severe Thunderstorm Warning | BIS | Dickey, LaMoure | 38 min |
| Jul 6, 2:29 AM CDT | Severe Thunderstorm Warning | FGF | Ransom, Richland, Sargent | 46 min |
| Jul 6, 2:50 AM CDT | Severe Thunderstorm Warning | FGF | Richland, Sargent | 40 min |
| Jul 6, 3:37 AM CDT | Severe Thunderstorm Warning | FGF | Richland | 53 min |
| Jul 6, 6:54 PM CDT | Severe Thunderstorm Warning | BIS | Divide, Williams | 66 min |
| Jul 6, 7:35 PM CDT | Severe Thunderstorm Warning | BIS | McKenzie, Mountrail, Williams | 55 min |
| Jul 6, 8:44 PM CDT | Severe Thunderstorm Warning | BIS | Dunn, McLean, Mercer, Mountrail | 61 min |
| Jul 6, 9:36 PM CDT | Severe Thunderstorm Warning | BIS | Burleigh, McLean, Mercer, Morton, Oliver | 54 min |
| Jul 6, 10:23 PM CDT | Severe Thunderstorm Warning | BIS | Burleigh, Morton, Oliver | 37 min |
| Jul 6, 11:11 PM CDT | Severe Thunderstorm Warning | BIS | Emmons, Morton, Sioux | 64 min |
| Jul 10, 6:58 PM CDT | Severe Thunderstorm Warning | BIS | Burke | 62 min |
| Jul 18, 6:40 PM CDT | Severe Thunderstorm Warning | BIS | LaMoure, Stutsman | 65 min |
| Jul 18, 11:34 PM CDT | Severe Thunderstorm Warning | FGF | Richland | 28 min |
| Jul 21, 12:36 PM CDT | Severe Thunderstorm Warning | BIS | Billings, Golden Valley | 54 min |
| Jul 21, 1:06 PM CDT | Severe Thunderstorm Warning | BIS | Adams, Bowman, Slope | 54 min |
| Jul 21, 1:09 PM CDT | Severe Thunderstorm Warning | BIS | Billings, Golden Valley, Slope | 66 min |
| Jul 21, 1:57 PM CDT | Severe Thunderstorm Warning | BIS | Adams, Bowman, Hettinger, Slope | 42 min |
| Jul 21, 2:38 PM CDT | Severe Thunderstorm Warning | BIS | Hettinger, Slope, Stark | 67 min |
| Jul 21, 3:27 PM CDT | Severe Thunderstorm Warning | BIS | Dunn, Grant, Hettinger, Mercer, Morton, Stark | 63 min |
| Jul 21, 3:56 PM CDT | Severe Thunderstorm Warning | BIS | Adams, Grant, Hettinger, Sioux | 64 min |
| Jul 21, 4:12 PM CDT | Severe Thunderstorm Warning | BIS | Mercer, Morton, Oliver | 63 min |
| Jul 21, 4:16 PM CDT | Severe Thunderstorm Warning | BIS | Grant, Morton | 59 min |
| Jul 21, 4:26 PM CDT | Severe Thunderstorm Warning | FGF | Cavalier, Pembina | 64 min |
| Jul 21, 4:40 PM CDT | Severe Thunderstorm Warning | BIS | Grant, Morton, Sioux | 65 min |
| Jul 21, 4:43 PM CDT | Severe Thunderstorm Warning | BIS | Burleigh, McLean, Mercer, Morton, Oliver | 62 min |
| Jul 21, 4:57 PM CDT | Severe Thunderstorm Warning | BIS | Burleigh, Emmons, Grant, Morton | 48 min |
| Jul 21, 5:33 PM CDT | Severe Thunderstorm Warning | BIS | Burleigh, Kidder, McLean, Oliver, Sheridan, Wells | 57 min |
| Jul 21, 5:37 PM CDT | Severe Thunderstorm Warning | BIS | Burleigh, Emmons, Kidder, Morton, Sioux | 53 min |
| Jul 21, 6:08 PM CDT | Severe Thunderstorm Warning | BIS | Emmons, Kidder, Logan, McIntosh, Stutsman | 67 min |
| Jul 21, 6:25 PM CDT | Severe Thunderstorm Warning | BIS | Burleigh, Foster, Kidder, Sheridan, Stutsman, Wells | 65 min |
| Jul 21, 7:03 PM CDT | Severe Thunderstorm Warning | FGF | Grand Forks | 27 min |
| Jul 21, 7:14 PM CDT | Severe Thunderstorm Warning | BIS | Foster, Kidder, Stutsman, Wells | 42 min |
| Jul 21, 7:26 PM CDT | Severe Thunderstorm Warning | FGF | Barnes, Eddy, Griggs, Nelson, Steele | 64 min |
| Jul 21, 7:30 PM CDT | Severe Thunderstorm Warning | FGF | Grand Forks | 60 min |
| Jul 21, 7:48 PM CDT | Severe Thunderstorm Warning | FGF | Grand Forks | 57 min |
| Jul 21, 8:09 PM CDT | Severe Thunderstorm Warning | FGF | Barnes, Cass, Grand Forks, Griggs, Nelson, Steele and 2 more | 66 min |
| Jul 21, 8:43 PM CDT | Severe Thunderstorm Warning | FGF | Cass, Grand Forks, Traill | 46 min |
| Jul 22, 5:18 PM CDT | Severe Thunderstorm Warning | BIS | Bowman, Slope | 57 min |
| Jul 22, 5:34 PM CDT | Severe Thunderstorm Warning | BIS | Golden Valley, Slope | 56 min |
| Jul 22, 6:13 PM CDT | Severe Thunderstorm Warning | BIS | Bowman | 32 min |
| Jul 24, 5:23 AM CDT | Severe Thunderstorm Warning | BIS | McKenzie, Williams | 52 min |
| Jul 24, 6:12 AM CDT | Severe Thunderstorm Warning | BIS | McKenzie | 48 min |
| Jul 24, 7:58 PM CDT | Severe Thunderstorm Warning | BIS | Divide, McKenzie, Williams | 62 min |
| Aug 3, 2:04 PM CDT | Severe Thunderstorm Warning | BIS | Grant, Morton | 56 min |
| Aug 4, 8:27 AM CDT | Severe Thunderstorm Warning | BIS | Grant, Morton | 33 min |
| Aug 17, 1:58 PM CDT | Severe Thunderstorm Warning | BIS | Bowman, Slope | 47 min |
| Aug 17, 2:44 PM CDT | Severe Thunderstorm Warning | BIS | Adams, Bowman | 49 min |
| Aug 17, 3:37 PM CDT | Severe Thunderstorm Warning | BIS | McHenry, Ward | 55 min |
| Aug 17, 5:45 PM CDT | Severe Thunderstorm Warning | BIS | Pierce, Rolette | 21 min |
| Aug 17, 7:07 PM CDT | Severe Thunderstorm Warning | FGF | Benson | 23 min |
| Aug 18, 1:25 PM CDT | Severe Thunderstorm Warning | FGF | Barnes | 30 min |
| Aug 20, 3:18 PM CDT | Severe Thunderstorm Warning | BIS | Rolette | 23 min |
| Aug 20, 4:11 PM CDT | Severe Thunderstorm Warning | BIS | Burke, Mountrail, Ward | 64 min |
| Aug 20, 4:31 PM CDT | Severe Thunderstorm Warning | BIS | Stark | 33 min |
| Aug 20, 5:06 PM CDT | Severe Thunderstorm Warning | BIS | Burke, Renville, Ward | 54 min |
| Aug 20, 5:43 PM CDT | Severe Thunderstorm Warning | BIS | Morton | 47 min |
| Aug 20, 9:48 PM CDT | Severe Thunderstorm Warning | BIS | Emmons, McIntosh | 57 min |
| Aug 30, 8:12 PM CDT | Severe Thunderstorm Warning | BIS | Billings, Dunn, McKenzie | 25 min |
| Aug 31, 5:39 PM CDT | Severe Thunderstorm Warning | BIS | McKenzie, Williams | 35 min |
| Sep 3, 5:41 PM CDT | Severe Thunderstorm Warning | BIS | Burke, Divide, Mountrail, Williams | 64 min |
| Sep 3, 6:23 PM CDT | Severe Thunderstorm Warning | BIS | Burke, Mountrail, Ward | 67 min |
| Sep 3, 7:30 PM CDT | Severe Thunderstorm Warning | BIS | Bottineau, Renville, Ward | 60 min |
| Sep 3, 8:06 PM CDT | Severe Thunderstorm Warning | BIS | Divide, Williams | 54 min |
| Sep 3, 8:43 PM CDT | Severe Thunderstorm Warning | BIS | McKenzie, Mountrail, Williams | 62 min |
| Sep 3, 9:06 PM CDT | Severe Thunderstorm Warning | BIS | Dunn, McKenzie | 54 min |
| Sep 3, 9:29 PM CDT | Severe Thunderstorm Warning | BIS | Billings, Dunn, McKenzie | 31 min |
| Sep 3, 9:31 PM CDT | Severe Thunderstorm Warning | BIS | Dunn, McKenzie, McLean, Mountrail | 59 min |
| Sep 3, 9:58 PM CDT | Severe Thunderstorm Warning | BIS | Dunn, Mercer | 62 min |
| Sep 3, 10:24 PM CDT | Severe Thunderstorm Warning | BIS | McLean, Mercer | 66 min |
| Sep 3, 11:07 PM CDT | Severe Thunderstorm Warning | BIS | Dunn, Mercer | 53 min |
| Sep 3, 11:24 PM CDT | Severe Thunderstorm Warning | BIS | McLean, Sheridan | 66 min |
| Sep 4, 12:02 AM CDT | Severe Thunderstorm Warning | BIS | Dunn, Mercer, Oliver | 58 min |
| Sep 4, 12:16 AM CDT | Severe Thunderstorm Warning | BIS | Sheridan, Wells | 59 min |
| Sep 4, 1:00 AM CDT | Severe Thunderstorm Warning | BIS | Sheridan, Wells | 60 min |
| Sep 4, 1:01 AM CDT | Severe Thunderstorm Warning | BIS | Burleigh, McLean, Oliver | 59 min |
| Sep 4, 1:49 AM CDT | Severe Thunderstorm Warning | BIS | Foster, Wells | 41 min |
| Sep 4, 2:01 AM CDT | Severe Thunderstorm Warning | BIS | Burleigh | 59 min |
| Sep 4, 2:36 AM CDT | Severe Thunderstorm Warning | FGF | Cass, Ransom, Richland | 54 min |
| Sep 4, 2:40 AM CDT | Severe Thunderstorm Warning | FGF | Barnes, Cass | 65 min |
| Sep 4, 2:43 AM CDT | Severe Thunderstorm Warning | BIS | Burleigh, Kidder | 41 min |
| Sep 4, 2:48 AM CDT | Severe Thunderstorm Warning | FGF | Barnes, Cass, Ransom | 42 min |
| Sep 4, 2:49 AM CDT | Severe Thunderstorm Warning | BIS | Burleigh, McLean, Oliver | 56 min |
| Sep 4, 3:28 AM CDT | Severe Thunderstorm Warning | FGF | Cass, Ransom, Richland | 62 min |
| Sep 4, 3:51 AM CDT | Severe Thunderstorm Warning | FGF | Barnes, Cass, Ransom, Richland | 54 min |
| Sep 4, 4:02 AM CDT | Severe Thunderstorm Warning | FGF | Cass, Richland | 58 min |
| Sep 19, 7:27 PM CDT | Severe Thunderstorm Warning | BIS | Wells | 36 min |
| Sep 20, 12:56 PM CDT | Severe Thunderstorm Warning | BIS | Dickey | 21 min |
| Sep 20, 2:01 PM CDT | Severe Thunderstorm Warning | FGF | Sargent | 14 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Morton County22
- McKenzie County17
- Dunn County17
- Cass County16
- Williams County15
- Mercer County15
- Grant County15
- Stutsman County13
- Stark County13
- Hettinger County13
- Burleigh County12
- McLean County11
- Oliver County11
- Kidder County10
- Slope County10
- Barnes County10
- Bowman County9
- Emmons County9
- Traill County9
- Adams County8
- Mountrail County8
- Wells County8
- Richland County8
- Dickey County7
- LaMoure County7
- Billings County7
- Ward County7
- Sioux County7
- Ransom County7
- Divide County6
- Golden Valley County6
- McIntosh County6
- Sargent County5
- Steele County5
- Pembina County5
- Burke County5
- Sheridan County5
- Grand Forks County5
- Cavalier County4
- Foster County4
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20132015
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.