Alert archive / Minnesota / Cass County
Weather alerts in Cass County, Minnesota, 2026
130 weather alerts in 2026, 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 2026. Tap one for its archive.
- Alerts
- 130
- Warnings
- 50
- Watches
- 26
- Advisories
- 33
- Busiest month
- June29 alerts
- Busiest day
- June 29, 20269 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
0 of 5 tornado warnings covering Cass County in 2026 had a tornado report inside them.
Cass County, 2026
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 5 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 26 | 22 | 15% | 28 | 82% | 29 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2026
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Duluth, MN: tornado warnings | 14 | 0 | 100% | 2 | 0% | |
| NWS Duluth, MN: severe thunderstorm warnings | 125 | 70 | 44% | 191 | 81% | 25 min |
An office's figures cover every county it serves, including across state lines.
The year is still running; reports filed late and damage surveys can still change these figures.
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, 2:31 AM CST | Winter Weather Advisory | DLH | 21 hr |
| Jan 5, 2:22 PM CST | Dense Fog Advisory | DLH | 22 hr |
| Jan 7, 6:16 PM CST | Dense Fog Advisory | DLH | 26 hr |
| Jan 17, 1:10 PM CST | Cold Weather Advisory | DLH | 71 hr |
| Jan 18, 1:34 AM CST | Winter Weather Advisory | DLH | 31 hr |
| Jan 20, 12:43 PM CST | Cold Weather Advisory | DLH | 49 hr |
| Jan 20, 12:43 PM CST | Extreme Cold Watch | DLH | 49 hr |
| Jan 20, 12:43 PM CST | Extreme Cold Warning | DLH | 4 days |
| Jan 23, 2:40 PM CST | Cold Weather Advisory | DLH | 69 hr |
| Jan 29, 12:50 PM CST | Cold Weather Advisory | DLH | 22 hr |
| Feb 13, 12:45 PM CST | Dense Fog Advisory | DLH | 5 hr |
| Feb 15, 4:12 AM CST | Dense Fog Advisory | DLH | 18 hr |
| Feb 15, 2:32 PM CST | Winter Storm Watch | DLH | 35 hr |
| Feb 17, 1:45 AM CST | Winter Weather Advisory | DLH | 58 hr |
| Feb 26, 11:02 AM CST | Wind Advisory | DLH | 37 hr |
| Mar 4, 4:59 PM CST | Dense Fog Advisory | DLH | 15 hr |
| Mar 6, 11:31 AM CST | Winter Weather Advisory | DLH | 18 hr |
| Mar 11, 12:54 PM CDT | Winter Storm Watch | DLH | 13 hr |
| Mar 11, 12:57 PM CDT | High Wind Watch | DLH | 12 hr |
| Mar 12, 1:22 AM CDT | High Wind Warning | DLH | 29 hr |
| Mar 12, 1:27 AM CDT | Winter Weather Advisory | DLH | 36 hr |
| Mar 12, 4:50 PM CDT | Mesoscale Discussion | SPC | 4 hr |
| Mar 13, 12:58 PM CDT | Winter Storm Watch | DLH | 12 hr |
| Mar 13, 12:58 PM CDT | Winter Storm Warning | DLH | 60 hr |
| Mar 14, 1:23 AM CDT | Winter Weather Advisory | DLH | 37 hr |
| Mar 27, 8:01 AM CDT | Fire Weather Watch | DLH | 3 hr |
| Mar 27, 11:14 AM CDT | Red Flag Warning | DLH | 32 hr |
| Mar 30, 11:09 AM CDT | Winter Weather Advisory | DLH | 24 hr |
| Mar 31, 2:24 PM CDT | Winter Storm Watch | DLH | 11 hr |
| Apr 1, 1:13 AM CDT | Winter Weather Advisory | DLH | 54 hr |
| Apr 1, 1:59 PM CDT | Winter Storm Watch | DLH | 36 hr |
| Apr 3, 2:10 AM CDT | Winter Storm Warning | DLH | 45 hr |
| Apr 4, 9:50 AM CDT | Winter Weather Advisory | DLH | 12 hr |
| Apr 8, 9:58 AM CDT | Snow Squall Warning | DLH | 62 min |
| Apr 8, 10:56 AM CDT | Snow Squall Warning | DLH | 64 min |
| Apr 16, 10:34 AM CDT | Red Flag Warning | DLH | 9 hr |
| Apr 19, 2:10 PM CDT | Fire Weather Watch | DLH | 13 hr |
| Apr 20, 3:15 AM CDT | Red Flag Warning | DLH | 17 hr |
| Apr 21, 1:28 PM CDT | Fire Weather Watch | DLH | 14 hr |
| Apr 22, 3:08 AM CDT | Red Flag Warning | DLH | 17 hr |
| May 8, 7:40 AM CDT | Red Flag Warning | DLH | 12 hr |
| May 9, 1:40 PM CDT | Red Flag Warning | DLH | 5 hr |
| May 13, 9:51 AM CDT | Fire Weather Watch | DLH | 26 hr |
| May 14, 10:10 AM CDT | Red Flag Warning | DLH | 7 hr |
| May 14, 11:25 AM CDT | Red Flag Warning | DLH | 34 hr |
| May 16, 9:54 AM CDT | Red Flag Warning | DLH | 11 hr |
| May 19, 2:09 PM CDT | Freeze Warning | DLH | 18 hr |
| May 24, 12:44 AM CDT | Dense Fog Advisory | DLH | 8 hr |
| May 26, 3:14 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 26, 5:27 PM CDT | Severe Thunderstorm Warning | DLH | 63 min |
| Jun 9, 1:15 AM CDT | Heat Advisory | DLH | 19 hr |
| Jun 10, 1:42 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 10, 2:39 AM CDT | Severe Thunderstorm Watch | SPC | 3 hr |
| Jun 10, 3:02 AM CDT | Severe Thunderstorm Warning | DLH | 58 min |
| Jun 10, 4:04 AM CDT | Mesoscale Discussion | SPC | 116 min |
| Jun 10, 12:35 PM CDT | Mesoscale Discussion | SPC | 115 min |
| Jun 10, 12:50 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 10, 2:57 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 10, 5:22 PM CDT | Severe Thunderstorm Warning | DLH | 53 min |
| Jun 19, 3:01 PM CDT | Tornado Warning | DLH | 14 min |
| Jun 19, 3:30 PM CDT | Severe Thunderstorm Warning | DLH | 60 min |
| Jun 23, 1:03 PM CDT | Mesoscale Discussion | SPC | 117 min |
| Jun 23, 5:40 PM CDT | Mesoscale Discussion | SPC | 95 min |
| Jun 28, 12:45 PM CDT | Heat Advisory | DLH | 54 hr |
| Jun 29, 10:13 AM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 29, 11:03 AM CDT | Severe Thunderstorm Warning | DLH | 87 min |
| Jun 29, 11:36 AM CDT | Tornado Warning | DLH | 39 min |
| Jun 29, 11:37 AM CDT | Mesoscale Discussion | SPC | 113 min |
| Jun 29, 11:47 AM CDT | Tornado Warning | DLH | 43 min |
| Jun 29, 12:01 PM CDT | Severe Thunderstorm Warning | DLH | 59 min |
| Jun 29, 12:05 PM CDT | Tornado Warning | DLH | 40 min |
| Jun 29, 12:24 PM CDT | Severe Thunderstorm Warning | DLH | 81 min |
| Jun 29, 12:49 PM CDT | Severe Thunderstorm Warning | DLH | 56 min |
| Jun 29, 7:25 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 29, 7:48 PM CDT | Tornado Watch | SPC | 6 hr |
| Jun 29, 10:04 PM CDT | Mesoscale Discussion | SPC | 116 min |
| Jun 29, 10:32 PM CDT | Severe Thunderstorm Warning | DLH | 58 min |
| Jun 29, 10:52 PM CDT | Tornado Warning | DLH | 38 min |
| Jun 29, 11:08 PM CDT | Severe Thunderstorm Warning | DLH | 67 min |
| Jul 2, 4:35 AM CDT | Heat Advisory | DLH | 15 hr |
| Jul 3, 8:21 PM CDT | Severe Thunderstorm Warning | DLH | 24 min |
| Jul 4, 1:27 PM CDT | Areal Flood Advisory | DLH | 3 hr |
| Jul 6, 1:40 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 6, 8:20 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 6, 8:45 PM CDT | Severe Thunderstorm Warning | DLH | 60 min |
| Jul 6, 9:33 PM CDT | Severe Thunderstorm Warning | DLH | 57 min |
| Jul 7, 1:31 PM CDT | Flood Watch | DLH | 20 hr |
| Jul 10, 1:00 PM CDT | Heat Advisory | DLH | 32 hr |
| Jul 10, 1:00 PM CDT | Extreme Heat Watch | DLH | 25 hr |
| Jul 11, 1:33 PM CDT | Heat Advisory | DLH | 4 days |
| Jul 11, 1:33 PM CDT | Extreme Heat Warning | DLH | 4 days |
| Jul 11, 2:51 PM CDT | Fire Weather Watch | DLH | 31 hr |
| Jul 12, 9:39 PM CDT | Red Flag Warning | DLH | 24 hr |
| Jul 17, 12:55 AM CDT | Heat Advisory | DLH | 20 hr |
| Jul 19, 1:12 AM CDT | Heat Advisory | DLH | 19 hr |
| Jul 24, 2:07 PM CDT | Heat Advisory | DLH | 31 hr |
| Jul 24, 2:07 PM CDT | Extreme Heat Watch | DLH | 22 hr |
| Jul 24, 3:34 PM CDT | Tornado Watch | SPC | 9 hr |
| Jul 24, 5:32 PM CDT | Mesoscale Discussion | SPC | 58 min |
| Jul 24, 5:47 PM CDT | Severe Thunderstorm Warning | DLH | 58 min |
| Jul 24, 7:35 PM CDT | Mesoscale Discussion | SPC | 85 min |
| Jul 24, 10:31 PM CDT | Severe Thunderstorm Warning | DLH | 59 min |
| Jul 25, 11:52 AM CDT | Extreme Heat Warning | DLH | 33 hr |
| Jul 26, 1:00 AM CDT | Dense Fog Advisory | DLH | 8 hr |
| Jul 26, 11:54 PM CDT | Mesoscale Discussion | SPC | 96 min |
| Jul 28, 2:31 PM CDT | Heat Advisory | DLH | 28 hr |
| Jul 30, 1:37 PM CDT | Mesoscale Discussion | SPC | 113 min |
| Aug 3, 5:54 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 3, 9:04 PM CDT | Mesoscale Discussion | SPC | 116 min |
| Aug 7, 6:14 AM CDT | Severe Thunderstorm Warning | DLH | 46 min |
| Aug 17, 4:00 PM CDT | Mesoscale Discussion | SPC | 90 min |
| Aug 17, 5:22 PM CDT | Severe Thunderstorm Warning | DLH | 53 min |
| Aug 20, 5:10 PM CDT | Severe Thunderstorm Warning | DLH | 65 min |
| Aug 20, 6:07 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 20, 6:45 PM CDT | Severe Thunderstorm Warning | DLH | 60 min |
| Sep 3, 11:46 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 3, 3:17 PM CDT | Mesoscale Discussion | SPC | 88 min |
| Sep 3, 3:46 PM CDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Sep 3, 4:56 PM CDT | Severe Thunderstorm Warning | DLH | 64 min |
| Sep 3, 5:54 PM CDT | Severe Thunderstorm Warning | DLH | 66 min |
| Sep 3, 10:38 PM CDT | Severe Thunderstorm Warning | DLH | 67 min |
| Sep 3, 11:29 PM CDT | Severe Thunderstorm Warning | DLH | 61 min |
| Sep 3, 11:55 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 11, 3:51 PM CDT | Mesoscale Discussion | SPC | 54 min |
| Sep 11, 6:39 PM CDT | Severe Thunderstorm Watch | SPC | 3 hr |
| Sep 11, 7:10 PM CDT | Severe Thunderstorm Warning | DLH | 35 min |
| Sep 11, 7:22 PM CDT | Severe Thunderstorm Warning | DLH | 53 min |
| Sep 11, 7:43 PM CDT | Severe Thunderstorm Warning | DLH | 34 min |
| Sep 17, 4:18 AM CDT | Dense Fog Advisory | DLH | 6 hr |
| Sep 21, 12:59 PM CDT | Frost Advisory | DLH | 19 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 archive2025
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.