Alert archive / North Dakota / Morton County
Weather alerts in Morton County, North Dakota, 2011
175 weather alerts in 2011, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Morton County and its neighbors
Each county as a circle sized by its count in 2011. Tap one for its archive.
- Alerts
- 175
- Warnings
- 108
- Watches
- 18
- Advisories
- 14
- Busiest month
- July61 alerts
- Busiest day
- June 13, 201118 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
5 of 18 tornado warnings covering Morton County in 2011 had a tornado report inside them; 5 of 6 tornado reports fell inside a warning, on average 11 minutes after it went out.
Morton County, 2011
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 18 | 5 | 72% | 6 | 83% | 11 min |
| Severe thunderstorm warnings | 67 | 31 | 54% | 45 | 91% | 27 min |
| Flash flood warnings | 8 | 4 | 50% | 3 | 67% | 18 min |
Each office's whole area, 2011
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Bismarck, ND: tornado warnings | 93 | 24 | 74% | 42 | 67% | 18 min |
| NWS Bismarck, ND: severe thunderstorm warnings | 334 | 147 | 56% | 286 | 85% | 26 min |
| NWS Bismarck, ND: flash flood warnings | 47 | 13 | 72% | 20 | 85% | 58 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 | Lasted |
|---|---|---|---|
| Mar 17, 4:32 PM CDT | River Flood Warning | BIS | 10 days |
| Mar 22, 12:00 PM CDT | River Flood Warning | BIS | 23 hr |
| Mar 22, 12:05 PM CDT | Mesoscale Discussion | SPC | 5 hr |
| Apr 1, 9:51 AM CDT | River Flood Warning | BIS | 7 days |
| Apr 3, 9:38 AM CDT | Areal Flood Advisory | BIS | 24 hr |
| Apr 22, 11:33 AM CDT | River Flood Warning | BIS | 47 hr |
| Apr 22, 1:07 PM CDT | Areal Flood Advisory | BIS | 69 hr |
| May 8, 6:13 PM CDT | Tornado Watch | SPC | 6 hr |
| May 8, 8:47 PM CDT | Mesoscale Discussion | SPC | 58 min |
| May 10, 1:56 AM CDT | Mesoscale Discussion | SPC | 94 min |
| May 13, 8:55 AM CDT | Areal Flood Advisory | BIS | 11 days |
| May 22, 2:13 PM CDT | Areal Flood Advisory | BIS | 24 hr |
| May 24, 11:39 AM CDT | Areal Flood Warning | BIS | 20 days |
| Jun 2, 7:22 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 7, 2:51 PM CDT | Mesoscale Discussion | SPC | 114 min |
| Jun 7, 3:50 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jun 7, 5:29 PM CDT | Severe Thunderstorm Warning | BIS | 61 min |
| Jun 7, 6:26 PM CDT | Severe Thunderstorm Warning | BIS | 19 min |
| Jun 7, 7:11 PM CDT | Mesoscale Discussion | SPC | 94 min |
| Jun 12, 5:42 PM CDT | Severe Thunderstorm Warning | BIS | 63 min |
| Jun 12, 6:07 PM CDT | Mesoscale Discussion | SPC | 53 min |
| Jun 12, 6:28 PM CDT | Tornado Watch | SPC | 6 hr |
| Jun 12, 7:08 PM CDT | Tornado Warning | BIS | 22 min |
| Jun 12, 7:36 PM CDT | Severe Thunderstorm Warning | BIS | 39 min |
| Jun 12, 7:54 PM CDT | Severe Thunderstorm Warning | BIS | 51 min |
| Jun 12, 8:05 PM CDT | Severe Thunderstorm Warning | BIS | 28 min |
| Jun 12, 8:14 PM CDT | Severe Thunderstorm Warning | BIS | 28 min |
| Jun 12, 8:17 PM CDT | Severe Thunderstorm Warning | BIS | 28 min |
| Jun 12, 8:25 PM CDT | Tornado Warning | BIS | 35 min |
| Jun 12, 8:40 PM CDT | Tornado Warning | BIS | 35 min |
| Jun 12, 8:56 PM CDT | Tornado Warning | BIS | 34 min |
| Jun 12, 9:09 PM CDT | Flash Flood Warning | BIS | 4 hr |
| Jun 12, 9:19 PM CDT | Mesoscale Discussion | SPC | 56 min |
| Jun 12, 9:24 PM CDT | Tornado Warning | BIS | 36 min |
| Jun 12, 9:39 PM CDT | Severe Thunderstorm Warning | BIS | 66 min |
| Jun 12, 10:03 PM CDT | Severe Thunderstorm Warning | BIS | 57 min |
| Jun 12, 10:09 PM CDT | Severe Thunderstorm Warning | BIS | 41 min |
| Jun 12, 10:23 PM CDT | Areal Flood Advisory | BIS | 8 hr |
| Jun 13, 1:18 AM CDT | Areal Flood Warning | BIS | 62 hr |
| Jun 13, 2:59 PM CDT | Areal Flood Warning | BIS | 70 days |
| Jun 14, 7:14 AM CDT | Severe Thunderstorm Warning | BIS | 61 min |
| Jun 15, 12:36 AM CDT | River Flood Warning | BIS | 10 hr |
| Jun 18, 5:01 PM CDT | Severe Thunderstorm Warning | BIS | 59 min |
| Jun 18, 5:20 PM CDT | Severe Thunderstorm Warning | BIS | 44 min |
| Jun 18, 5:26 PM CDT | Tornado Warning | BIS | 21 min |
| Jun 18, 5:59 PM CDT | Flash Flood Warning | BIS | 5 hr |
| Jun 18, 6:02 PM CDT | Tornado Warning | BIS | 28 min |
| Jun 18, 6:26 PM CDT | Flash Flood Warning | BIS | 3 hr |
| Jun 18, 6:40 PM CDT | Severe Thunderstorm Warning | BIS | 65 min |
| Jun 18, 7:43 PM CDT | Severe Thunderstorm Warning | BIS | 62 min |
| Jun 18, 7:52 PM CDT | Areal Flood Advisory | BIS | 3 hr |
| Jun 18, 8:49 PM CDT | Severe Thunderstorm Warning | BIS | 56 min |
| Jun 18, 9:35 PM CDT | Areal Flood Warning | BIS | 19 hr |
| Jun 18, 11:20 PM CDT | Areal Flood Warning | BIS | 18 hr |
| Jun 20, 2:46 PM CDT | Tornado Warning | BIS | 29 min |
| Jun 25, 3:24 PM CDT | Mesoscale Discussion | SPC | 66 min |
| Jun 25, 8:01 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jun 25, 9:06 PM CDT | Severe Thunderstorm Warning | BIS | 54 min |
| Jun 25, 9:57 PM CDT | Areal Flood Advisory | BIS | 53 min |
| Jun 25, 10:00 PM CDT | Severe Thunderstorm Warning | BIS | 27 min |
| Jul 6, 1:25 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 8, 2:13 PM CDT | Mesoscale Discussion | SPC | 62 min |
| Jul 8, 2:32 PM CDT | Tornado Watch | SPC | 9 hr |
| Jul 8, 4:26 PM CDT | Severe Thunderstorm Warning | BIS | 64 min |
| Jul 8, 4:30 PM CDT | Severe Thunderstorm Warning | BIS | 60 min |
| Jul 8, 5:18 PM CDT | Tornado Warning | BIS | 42 min |
| Jul 8, 5:53 PM CDT | Severe Thunderstorm Warning | BIS | 52 min |
| Jul 8, 6:21 PM CDT | Tornado Warning | BIS | 24 min |
| Jul 8, 6:45 PM CDT | Tornado Warning | BIS | 45 min |
| Jul 8, 8:06 PM CDT | Areal Flood Advisory | BIS | 11 hr |
| Jul 10, 10:20 AM CDT | Severe Thunderstorm Warning | BIS | 55 min |
| Jul 10, 10:32 AM CDT | Mesoscale Discussion | SPC | 118 min |
| Jul 10, 11:08 AM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 10, 11:09 AM CDT | Severe Thunderstorm Warning | BIS | 66 min |
| Jul 10, 11:16 AM CDT | Severe Thunderstorm Warning | BIS | 59 min |
| Jul 10, 11:52 AM CDT | Severe Thunderstorm Warning | BIS | 26 min |
| Jul 10, 12:04 PM CDT | Severe Thunderstorm Warning | BIS | 37 min |
| Jul 10, 12:09 PM CDT | Areal Flood Advisory | BIS | 6 hr |
| Jul 10, 12:16 PM CDT | Severe Thunderstorm Warning | BIS | 47 min |
| Jul 10, 1:01 PM CDT | Severe Thunderstorm Warning | BIS | 29 min |
| Jul 10, 1:30 PM CDT | Severe Thunderstorm Warning | BIS | 60 min |
| Jul 10, 1:50 PM CDT | Areal Flood Advisory | BIS | 4 hr |
| Jul 10, 2:08 PM CDT | Mesoscale Discussion | SPC | 97 min |
| Jul 10, 5:52 PM CDT | Areal Flood Warning | BIS | 24 hr |
| Jul 14, 5:33 PM CDT | Tornado Watch | SPC | 7 hr |
| Jul 14, 11:01 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 16, 3:53 PM CDT | Mesoscale Discussion | SPC | 97 min |
| Jul 16, 4:57 PM CDT | Tornado Watch | SPC | 7 hr |
| Jul 16, 6:52 PM CDT | Severe Thunderstorm Warning | BIS | 53 min |
| Jul 22, 11:05 AM CDT | Mesoscale Discussion | SPC | 55 min |
| Jul 22, 5:17 PM CDT | Mesoscale Discussion | SPC | 88 min |
| Jul 22, 5:26 PM CDT | Severe Thunderstorm Warning | BIS | 64 min |
| Jul 22, 5:35 PM CDT | Tornado Watch | SPC | 8 hr |
| Jul 22, 6:11 PM CDT | Flash Flood Warning | BIS | 116 min |
| Jul 22, 6:36 PM CDT | Tornado Warning | BIS | 24 min |
| Jul 22, 6:59 PM CDT | Severe Thunderstorm Warning | BIS | 10 min |
| Jul 22, 8:56 PM CDT | Mesoscale Discussion | SPC | 94 min |
| Jul 22, 9:13 PM CDT | Severe Thunderstorm Warning | BIS | 62 min |
| Jul 22, 10:00 PM CDT | Tornado Warning | BIS | 30 min |
| Jul 22, 10:12 PM CDT | Severe Thunderstorm Warning | BIS | 63 min |
| Jul 22, 10:16 PM CDT | Severe Thunderstorm Warning | BIS | 59 min |
| Jul 22, 10:27 PM CDT | Tornado Warning | BIS | 33 min |
| Jul 22, 10:51 PM CDT | Tornado Warning | BIS | 24 min |
| Jul 22, 11:07 PM CDT | Severe Thunderstorm Warning | BIS | 68 min |
| Jul 22, 11:11 PM CDT | Severe Thunderstorm Warning | BIS | 64 min |
| Jul 24, 1:04 PM CDT | Mesoscale Discussion | SPC | 86 min |
| Jul 24, 2:43 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 24, 2:48 PM CDT | Severe Thunderstorm Warning | BIS | 57 min |
| Jul 24, 3:37 PM CDT | Severe Thunderstorm Warning | BIS | 53 min |
| Jul 24, 3:45 PM CDT | Severe Thunderstorm Warning | BIS | 60 min |
| Jul 24, 4:30 PM CDT | Severe Thunderstorm Warning | BIS | 45 min |
| Jul 24, 5:26 PM CDT | Mesoscale Discussion | SPC | 94 min |
| Jul 29, 9:25 PM CDT | Severe Thunderstorm Warning | BIS | 65 min |
| Jul 29, 10:14 PM CDT | Mesoscale Discussion | SPC | 61 min |
| Jul 29, 10:26 PM CDT | Severe Thunderstorm Warning | BIS | 45 min |
| Jul 30, 2:34 AM CDT | Severe Thunderstorm Warning | BIS | 56 min |
| Jul 30, 2:48 AM CDT | Areal Flood Advisory | BIS | 3 hr |
| Jul 30, 3:08 AM CDT | Flash Flood Warning | BIS | 6 hr |
| Jul 30, 9:19 AM CDT | Areal Flood Advisory | BIS | 3 hr |
| Jul 31, 12:50 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 31, 5:44 PM CDT | Tornado Watch | SPC | 7 hr |
| Jul 31, 8:16 PM CDT | Mesoscale Discussion | SPC | 89 min |
| Jul 31, 9:25 PM CDT | Severe Thunderstorm Warning | BIS | 65 min |
| Jul 31, 10:00 PM CDT | Severe Thunderstorm Warning | BIS | 60 min |
| Jul 31, 10:13 PM CDT | Severe Thunderstorm Warning | BIS | 47 min |
| Jul 31, 10:26 PM CDT | Severe Thunderstorm Warning | BIS | 46 min |
| Jul 31, 10:35 PM CDT | Flash Flood Warning | BIS | 5 hr |
| Jul 31, 10:49 PM CDT | Severe Thunderstorm Warning | BIS | 56 min |
| Jul 31, 11:00 PM CDT | Severe Thunderstorm Warning | BIS | 60 min |
| Aug 1, 1:33 PM CDT | Mesoscale Discussion | SPC | 57 min |
| Aug 1, 2:19 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 1, 5:57 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 1, 6:10 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 5, 1:05 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 5, 1:48 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 5, 5:23 PM CDT | Severe Thunderstorm Warning | BIS | 67 min |
| Aug 5, 5:25 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 5, 5:34 PM CDT | Tornado Warning | BIS | 26 min |
| Aug 5, 5:42 PM CDT | Areal Flood Advisory | BIS | 93 min |
| Aug 5, 6:04 PM CDT | Severe Thunderstorm Warning | BIS | 41 min |
| Aug 5, 6:19 PM CDT | Severe Thunderstorm Warning | BIS | 39 min |
| Aug 5, 6:26 PM CDT | Mesoscale Discussion | SPC | 94 min |
| Aug 5, 6:43 PM CDT | Severe Thunderstorm Warning | BIS | 62 min |
| Aug 11, 1:49 PM CDT | Mesoscale Discussion | SPC | 86 min |
| Aug 14, 8:42 PM CDT | Mesoscale Discussion | SPC | 93 min |
| Aug 14, 9:18 PM CDT | Areal Flood Advisory | BIS | 6 hr |
| Aug 14, 10:14 PM CDT | Flash Flood Warning | BIS | 6 hr |
| Aug 15, 12:23 AM CDT | Severe Thunderstorm Warning | BIS | 67 min |
| Aug 15, 3:22 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 15, 4:04 AM CDT | Areal Flood Warning | BIS | 7 hr |
| Aug 15, 5:10 AM CDT | Severe Thunderstorm Warning | BIS | 65 min |
| Aug 15, 3:47 PM CDT | Mesoscale Discussion | SPC | 58 min |
| Aug 15, 5:23 PM CDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Aug 15, 5:41 PM CDT | Tornado Warning | BIS | 34 min |
| Aug 15, 6:14 PM CDT | Severe Thunderstorm Warning | BIS | 20 min |
| Aug 15, 7:07 PM CDT | Severe Thunderstorm Warning | BIS | 68 min |
| Aug 15, 7:20 PM CDT | Tornado Warning | BIS | 25 min |
| Aug 15, 8:03 PM CDT | Severe Thunderstorm Warning | BIS | 57 min |
| Aug 15, 8:52 PM CDT | Severe Thunderstorm Warning | BIS | 53 min |
| Aug 15, 9:09 PM CDT | Severe Thunderstorm Warning | BIS | 66 min |
| Aug 15, 9:18 PM CDT | Flash Flood Warning | BIS | 6 hr |
| Aug 15, 9:37 PM CDT | Mesoscale Discussion | SPC | 83 min |
| Aug 16, 12:11 AM CDT | Severe Thunderstorm Warning | BIS | 64 min |
| Aug 18, 3:43 PM CDT | Mesoscale Discussion | SPC | 92 min |
| Aug 28, 2:09 AM CDT | Mesoscale Discussion | SPC | 66 min |
| Aug 28, 4:06 AM CDT | Severe Thunderstorm Warning | BIS | 39 min |
| Aug 31, 8:53 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 31, 10:36 PM CDT | Severe Thunderstorm Warning | BIS | 54 min |
| Aug 31, 10:54 PM CDT | Mesoscale Discussion | SPC | 96 min |
| Aug 31, 11:25 PM CDT | Severe Thunderstorm Warning | BIS | 65 min |
| Aug 31, 11:49 PM CDT | Severe Thunderstorm Warning | BIS | 56 min |
| Oct 5, 4:27 AM CDT | Red Flag Warning | BIS | 16 hr |
| Oct 6, 4:49 AM CDT | Fire Weather Watch | BIS | 24 hr |
| Oct 6, 4:49 AM CDT | Red Flag Warning | BIS | 16 hr |
| Oct 7, 4:37 AM CDT | Red Flag Warning | BIS | 16 hr |
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
| Product | Alerts |
|---|---|
| Severe storms | |
| Severe Thunderstorm Warning | 67 |
| Tornado Warning | 18 |
| Severe Thunderstorm Watch | 10 |
| Tornado Watch | 7 |
| Mesoscale Discussion | 35 |
| Flooding | |
| Areal Flood Warning | 7 |
| Flash Flood Warning | 8 |
| River Flood Warning | 5 |
| Areal Flood Advisory | 14 |
| Fire | |
| Red Flag Warning | 3 |
| Fire Weather Watch | 1 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20102012
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.