Alert archive / North Dakota / Cass County
Weather alerts in Cass County, North Dakota, 2024
129 weather alerts in 2024, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Cass County and its neighbors
Each county as a circle sized by its count in 2024. Tap one for its archive.
- Alerts
- 129
- Warnings
- 40
- Watches
- 20
- Advisories
- 47
- Busiest month
- June23 alerts
- Busiest day
- June 18, 20248 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
1 of 1 tornado warnings covering Cass County in 2024 had a tornado report inside them.
Cass County, 2024
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 1 | 1 | 0% | 0 | ||
| Severe thunderstorm warnings | 15 | 10 | 33% | 5 | 60% | 17 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2024
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Grand Forks, ND: tornado warnings | 20 | 5 | 75% | 6 | 83% | 13 min |
| NWS Grand Forks, ND: severe thunderstorm warnings | 154 | 91 | 41% | 197 | 76% | 24 min |
| NWS Grand Forks, ND: flash flood warnings | 12 | 6 | 50% | 7 | 86% | 104 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 |
|---|---|---|---|
| Jan 4, 9:50 PM CST | Winter Weather Advisory | FGF | 36 hr |
| Jan 12, 3:37 PM CST | Winter Weather Advisory | FGF | 32 hr |
| Jan 13, 3:30 AM CST | Blizzard Warning | FGF | 15 hr |
| Jan 13, 3:30 AM CST | Wind Chill Warning | FGF | 57 hr |
| Jan 13, 3:25 PM CST | Wind Chill Advisory | FGF | 72 hr |
| Jan 21, 4:41 PM CST | Winter Weather Advisory | FGF | 13 hr |
| Jan 25, 4:47 PM CST | Dense Fog Advisory | FGF | 19 hr |
| Jan 26, 9:03 PM CST | Dense Fog Advisory | FGF | 13 hr |
| Jan 30, 5:45 PM CST | Dense Fog Advisory | FGF | 9 hr |
| Jan 31, 8:30 PM CST | Dense Fog Advisory | FGF | 13 hr |
| Feb 3, 5:48 PM CST | Dense Fog Advisory | FGF | 42 hr |
| Feb 5, 7:36 PM CST | Dense Fog Advisory | FGF | 19 hr |
| Feb 25, 3:30 PM CST | Winter Storm Watch | FGF | 28 hr |
| Feb 26, 7:23 PM CST | Winter Storm Warning | FGF | 22 hr |
| Feb 27, 8:45 AM CST | Mesoscale Discussion | SPC | 4 hr |
| Feb 27, 9:41 AM CST | Blizzard Warning | FGF | 8 hr |
| Feb 27, 5:56 PM CST | Wind Chill Advisory | FGF | 15 hr |
| Mar 3, 4:42 AM CST | Wind Advisory | FGF | 25 hr |
| Mar 15, 3:56 AM CDT | Red Flag Warning | FGF | 16 hr |
| Mar 20, 2:27 PM CDT | Winter Weather Advisory | FGF | 37 hr |
| Mar 22, 3:46 AM CDT | Winter Storm Watch | FGF | 34 hr |
| Mar 23, 1:37 PM CDT | Winter Storm Warning | FGF | 61 hr |
| Mar 26, 2:59 AM CDT | Winter Weather Advisory | FGF | 31 hr |
| Apr 5, 3:04 PM CDT | Fire Weather Watch | FGF | 12 hr |
| Apr 6, 2:48 AM CDT | Wind Advisory | FGF | 16 hr |
| Apr 6, 2:58 AM CDT | Red Flag Warning | FGF | 16 hr |
| Apr 6, 12:06 PM CDT | Blowing Dust Advisory | FGF | 7 hr |
| Apr 15, 2:49 PM CDT | Wind Advisory | FGF | 28 hr |
| Apr 21, 3:31 PM CDT | Fire Weather Watch | FGF | 13 hr |
| Apr 22, 4:20 AM CDT | Red Flag Warning | FGF | 16 hr |
| Apr 25, 12:45 PM CDT | Red Flag Warning | FGF | 7 hr |
| Apr 25, 1:08 PM CDT | Wind Advisory | FGF | 7 hr |
| May 5, 2:19 PM CDT | Wind Advisory | FGF | 32 hr |
| May 16, 9:36 PM CDT | Severe Thunderstorm Warning | FGF | 39 min |
| May 16, 10:10 PM CDT | Severe Thunderstorm Warning | FGF | 50 min |
| May 17, 5:33 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 17, 8:07 PM CDT | Mesoscale Discussion | SPC | 113 min |
| May 17, 11:37 PM CDT | Mesoscale Discussion | SPC | 83 min |
| May 18, 2:16 AM CDT | Wind Advisory | FGF | 17 hr |
| May 21, 2:55 AM CDT | Wind Advisory | FGF | 19 hr |
| May 21, 11:13 AM CDT | River Flood Warning | FGF | 20 days |
| May 23, 9:06 PM CDT | River Flood Watch | FGF | 37 hr |
| May 24, 2:41 PM CDT | Wind Advisory | FGF | 7 hr |
| May 24, 2:49 PM CDT | Tornado Warning | FGF | 26 min |
| May 25, 10:50 AM CDT | River Flood Warning | FGF | 9 hr |
| Jun 2, 3:51 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 4, 2:16 PM CDT | Wind Advisory | FGF | 31 hr |
| Jun 6, 2:40 AM CDT | Wind Advisory | FGF | 17 hr |
| Jun 12, 3:32 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 16, 4:52 AM CDT | Severe Thunderstorm Warning | FGF | 53 min |
| Jun 16, 5:08 AM CDT | Special Weather Statement | FGF | 37 min |
| Jun 16, 5:44 AM CDT | Special Weather Statement | FGF | 46 min |
| Jun 16, 5:59 AM CDT | Special Weather Statement | FGF | 31 min |
| Jun 16, 4:37 PM CDT | Flood Watch | FGF | 38 hr |
| Jun 17, 10:42 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 18, 1:23 AM CDT | Severe Thunderstorm Warning | FGF | 52 min |
| Jun 18, 1:49 AM CDT | Mesoscale Discussion | SPC | 86 min |
| Jun 18, 2:07 AM CDT | Severe Thunderstorm Warning | FGF | 23 min |
| Jun 18, 2:11 AM CDT | Severe Thunderstorm Warning | FGF | 49 min |
| Jun 18, 2:22 AM CDT | Severe Thunderstorm Warning | FGF | 38 min |
| Jun 18, 2:50 AM CDT | Severe Thunderstorm Warning | FGF | 40 min |
| Jun 18, 3:24 AM CDT | Severe Thunderstorm Warning | FGF | 66 min |
| Jun 19, 9:57 AM CDT | River Flood Warning | FGF | 71 hr |
| Jun 24, 5:43 PM CDT | Mesoscale Discussion | SPC | 77 min |
| Jun 24, 5:52 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 24, 7:53 PM CDT | Mesoscale Discussion | SPC | 97 min |
| Jun 28, 5:33 AM CDT | River Flood Watch | FGF | 27 hr |
| Jun 29, 8:24 AM CDT | River Flood Warning | FGF | 6 days |
| Jul 8, 7:42 PM CDT | Special Weather Statement | FGF | 48 min |
| Jul 9, 7:01 PM CDT | Special Weather Statement | FGF | 29 min |
| Jul 9, 7:31 PM CDT | Special Weather Statement | FGF | 29 min |
| Jul 12, 2:18 PM CDT | Heat Advisory | FGF | 30 hr |
| Jul 13, 1:03 AM CDT | Special Weather Statement | FGF | 42 min |
| Jul 13, 1:54 AM CDT | Special Weather Statement | FGF | 66 min |
| Jul 13, 3:44 PM CDT | Mesoscale Discussion | SPC | 91 min |
| Jul 13, 5:38 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 13, 7:57 PM CDT | Severe Thunderstorm Warning | FGF | 37 min |
| Jul 14, 9:50 PM CDT | Mesoscale Discussion | SPC | 115 min |
| Jul 14, 11:34 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 15, 2:36 AM CDT | Mesoscale Discussion | SPC | 114 min |
| Jul 15, 3:20 AM CDT | Severe Thunderstorm Warning | FGF | 40 min |
| Jul 15, 3:51 AM CDT | Severe Thunderstorm Warning | FGF | 54 min |
| Jul 15, 4:29 AM CDT | Areal Flood Advisory | FGF | 94 min |
| Jul 21, 5:51 PM CDT | Areal Flood Advisory | FGF | 3 hr |
| Jul 25, 2:38 PM CDT | Heat Advisory | FGF | 30 hr |
| Jul 29, 10:19 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 30, 12:07 AM CDT | Special Weather Statement | FGF | 23 min |
| Jul 31, 11:47 AM CDT | Mesoscale Discussion | SPC | 88 min |
| Jul 31, 12:14 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 31, 12:54 PM CDT | Special Weather Statement | FGF | 51 min |
| Aug 3, 1:09 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 23, 12:38 AM CDT | Dense Fog Advisory | FGF | 9 hr |
| Aug 24, 2:41 AM CDT | Heat Advisory | FGF | 41 hr |
| Aug 28, 6:00 AM CDT | Dense Fog Advisory | FGF | 4 hr |
| Aug 28, 10:54 PM CDT | Severe Thunderstorm Warning | FGF | 66 min |
| Aug 28, 11:54 PM CDT | Severe Thunderstorm Warning | FGF | 66 min |
| Aug 29, 1:02 AM CDT | Severe Thunderstorm Warning | FGF | 43 min |
| Aug 29, 1:44 AM CDT | Special Weather Statement | FGF | 46 min |
| Sep 12, 1:56 AM CDT | Wind Advisory | FGF | 17 hr |
| Sep 29, 2:24 PM CDT | Wind Advisory | FGF | 31 hr |
| Sep 29, 6:50 PM CDT | Fire Weather Watch | FGF | 8 hr |
| Sep 30, 3:15 AM CDT | Red Flag Warning | FGF | 18 hr |
| Oct 3, 1:31 PM CDT | Frost Advisory | FGF | 18 hr |
| Oct 4, 2:50 AM CDT | High Wind Watch | FGF | 24 hr |
| Oct 4, 2:26 PM CDT | Red Flag Warning | FGF | 31 hr |
| Oct 5, 2:59 AM CDT | High Wind Warning | FGF | 22 hr |
| Oct 5, 2:59 AM CDT | Wind Advisory | FGF | 27 hr |
| Oct 13, 10:30 AM CDT | Freeze Warning | FGF | 23 hr |
| Oct 14, 11:04 AM CDT | Freeze Warning | FGF | 23 hr |
| Oct 15, 2:01 PM CDT | Red Flag Warning | FGF | 29 hr |
| Oct 16, 3:40 PM CDT | Red Flag Warning | FGF | 27 hr |
| Oct 19, 3:30 AM CDT | Dense Fog Advisory | FGF | 10 hr |
| Nov 12, 11:59 AM CST | Wind Advisory | FGF | 6 hr |
| Nov 19, 3:31 AM CST | Winter Weather Advisory | FGF | 38 hr |
| Dec 3, 12:33 PM CST | Winter Storm Watch | FGF | 15 hr |
| Dec 3, 12:33 PM CST | Winter Weather Advisory | FGF | 29 hr |
| Dec 4, 9:16 AM CST | Snow Squall Warning | FGF | 29 min |
| Dec 4, 9:45 AM CST | Snow Squall Warning | FGF | 30 min |
| Dec 4, 10:12 AM CST | Snow Squall Warning | FGF | 33 min |
| Dec 7, 1:57 PM CST | Winter Weather Advisory | FGF | 34 hr |
| Dec 9, 2:49 AM CST | Winter Weather Advisory | FGF | 12 hr |
| Dec 13, 1:06 PM CST | Winter Weather Advisory | FGF | 47 hr |
| Dec 17, 1:52 PM CST | Winter Storm Watch | FGF | 23 hr |
| Dec 18, 1:16 PM CST | Winter Storm Warning | FGF | 29 hr |
| Dec 22, 4:24 PM CST | Winter Weather Advisory | FGF | 10 hr |
| Dec 23, 2:48 AM CST | Dense Fog Advisory | FGF | 33 hr |
| Dec 26, 1:42 PM CST | Dense Fog Advisory | FGF | 22 hr |
| Dec 27, 7:41 PM CST | Dense Fog Advisory | FGF | 13 hr |
| Dec 28, 8:40 PM CST | Dense Fog Advisory | FGF | 46 hr |
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20232025
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.