Alert archive / Minnesota / Cass County
Weather alerts in Cass County, Minnesota, 2024
109 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
- 109
- Warnings
- 36
- Watches
- 17
- Advisories
- 31
- Busiest month
- June44 alerts
- Busiest day
- June 18, 202419 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 4 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 | 4 | 1 | 75% | 0 | ||
| Severe thunderstorm warnings | 26 | 16 | 38% | 20 | 70% | 17 min |
| Flash flood warnings | 1 | 1 | 0% | 1 | 100% | 147 min |
Each office's whole area, 2024
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Duluth, MN: tornado warnings | 24 | 5 | 79% | 25 | 96% | 12 min |
| NWS Duluth, MN: severe thunderstorm warnings | 94 | 52 | 45% | 198 | 73% | 26 min |
| NWS Duluth, MN: flash flood warnings | 12 | 7 | 42% | 54 | 83% | 145 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 11, 3:34 PM CST | Winter Weather Advisory | DLH | 35 hr |
| Jan 13, 2:30 PM CST | Wind Chill Advisory | DLH | 70 hr |
| Jan 28, 1:25 AM CST | Dense Fog Advisory | DLH | 9 hr |
| Feb 3, 8:50 PM CST | Dense Fog Advisory | DLH | 15 hr |
| Feb 4, 3:03 PM CST | Dense Fog Advisory | DLH | 21 hr |
| Feb 27, 2:10 PM CST | Wind Chill Advisory | DLH | 20 hr |
| Mar 20, 2:51 PM CDT | Winter Weather Advisory | DLH | 37 hr |
| Mar 22, 3:46 AM CDT | Winter Storm Watch | DLH | 33 hr |
| Mar 23, 3:35 AM CDT | Winter Storm Warning | DLH | 4 days |
| May 7, 3:22 PM CDT | Special Weather Statement | DLH | 23 min |
| May 8, 4:06 AM CDT | Dense Fog Advisory | DLH | 5 hr |
| May 20, 3:04 PM CDT | Flood Watch | DLH | 40 hr |
| May 24, 9:42 AM CDT | Wind Advisory | DLH | 10 hr |
| Jun 3, 3:59 PM CDT | Flood Watch | DLH | 38 hr |
| Jun 4, 12:24 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 4, 1:54 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 4, 2:28 PM CDT | Special Weather Statement | DLH | 17 min |
| Jun 5, 3:02 PM CDT | Mesoscale Discussion | SPC | 118 min |
| Jun 5, 3:19 PM CDT | Special Weather Statement | DLH | 26 min |
| Jun 12, 2:33 PM CDT | Mesoscale Discussion | SPC | 117 min |
| Jun 12, 3:32 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 12, 4:42 PM CDT | Severe Thunderstorm Warning | DLH | 48 min |
| Jun 12, 4:45 PM CDT | Severe Thunderstorm Warning | DLH | 45 min |
| Jun 12, 5:07 PM CDT | Severe Thunderstorm Warning | DLH | 38 min |
| Jun 12, 5:26 PM CDT | Severe Thunderstorm Warning | DLH | 49 min |
| Jun 12, 5:32 PM CDT | Severe Thunderstorm Warning | DLH | 43 min |
| Jun 12, 5:35 PM CDT | Severe Thunderstorm Warning | DLH | 55 min |
| Jun 12, 5:35 PM CDT | Mesoscale Discussion | SPC | 85 min |
| Jun 12, 5:39 PM CDT | Severe Thunderstorm Warning | DLH | 51 min |
| Jun 12, 6:17 PM CDT | Tornado Warning | DLH | 28 min |
| Jun 16, 4:22 PM CDT | Flood Watch | DLH | 63 hr |
| Jun 17, 11:24 PM CDT | Special Weather Statement | DLH | 36 min |
| Jun 17, 11:36 PM CDT | Mesoscale Discussion | SPC | 114 min |
| Jun 18, 1:49 AM CDT | Mesoscale Discussion | SPC | 86 min |
| Jun 18, 2:08 AM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 18, 3:23 AM CDT | Severe Thunderstorm Warning | DLH | 37 min |
| Jun 18, 5:02 AM CDT | Severe Thunderstorm Warning | DLH | 58 min |
| Jun 18, 5:56 AM CDT | Special Weather Statement | DLH | 34 min |
| Jun 18, 6:03 AM CDT | Mesoscale Discussion | SPC | 87 min |
| Jun 18, 12:20 PM CDT | Mesoscale Discussion | SPC | 115 min |
| Jun 18, 1:03 PM CDT | Areal Flood Advisory | DLH | 75 min |
| Jun 18, 1:24 PM CDT | Tornado Watch | SPC | 8 hr |
| Jun 18, 1:57 PM CDT | Severe Thunderstorm Warning | DLH | 48 min |
| Jun 18, 2:46 PM CDT | Tornado Warning | DLH | 29 min |
| Jun 18, 2:48 PM CDT | Severe Thunderstorm Warning | DLH | 42 min |
| Jun 18, 3:05 PM CDT | Tornado Warning | DLH | 40 min |
| Jun 18, 3:09 PM CDT | Severe Thunderstorm Warning | DLH | 39 min |
| Jun 18, 3:10 PM CDT | Tornado Warning | DLH | 37 min |
| Jun 18, 4:01 PM CDT | Flash Flood Warning | DLH | 5 hr |
| Jun 18, 5:05 PM CDT | Severe Thunderstorm Warning | DLH | 26 min |
| Jun 18, 9:04 PM CDT | Areal Flood Warning | DLH | 6 days |
| Jun 20, 9:35 AM CDT | Areal Flood Advisory | DLH | 29 hr |
| Jun 24, 5:52 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 24, 7:53 PM CDT | Mesoscale Discussion | SPC | 97 min |
| Jun 24, 10:08 PM CDT | Severe Thunderstorm Warning | DLH | 24 min |
| Jun 28, 11:52 PM CDT | Severe Thunderstorm Warning | DLH | 38 min |
| Jun 29, 12:25 AM CDT | Severe Thunderstorm Warning | DLH | 43 min |
| Jul 4, 5:35 PM CDT | Areal Flood Advisory | DLH | 13 hr |
| 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, 7:16 PM CDT | Mesoscale Discussion | SPC | 89 min |
| Jul 13, 10:48 PM CDT | Special Weather Statement | DLH | 27 min |
| Jul 13, 11:36 PM CDT | Special Weather Statement | DLH | 24 min |
| Jul 28, 8:35 PM CDT | Areal Flood Advisory | DLH | 4 hr |
| Jul 30, 2:27 AM CDT | Special Weather Statement | DLH | 48 min |
| Jul 30, 3:10 AM CDT | Special Weather Statement | DLH | 35 min |
| Jul 31, 1:38 PM CDT | Mesoscale Discussion | SPC | 97 min |
| Jul 31, 2:21 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 31, 2:45 PM CDT | Severe Thunderstorm Warning | DLH | 60 min |
| Jul 31, 3:40 PM CDT | Severe Thunderstorm Warning | DLH | 65 min |
| Aug 3, 12:10 PM CDT | Severe Thunderstorm Warning | DLH | 50 min |
| Aug 3, 12:53 PM CDT | Severe Thunderstorm Warning | DLH | 52 min |
| Aug 3, 1:09 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 3, 5:00 PM CDT | Severe Thunderstorm Warning | DLH | 45 min |
| Aug 3, 5:44 PM CDT | Special Weather Statement | DLH | 31 min |
| Aug 3, 5:56 PM CDT | Severe Thunderstorm Warning | DLH | 49 min |
| Aug 3, 6:00 PM CDT | Severe Thunderstorm Warning | DLH | 45 min |
| Aug 3, 6:26 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 3, 6:41 PM CDT | Severe Thunderstorm Warning | DLH | 49 min |
| Aug 6, 1:32 AM CDT | Dense Fog Advisory | DLH | 6 hr |
| Aug 24, 2:46 AM CDT | Dense Fog Advisory | DLH | 7 hr |
| Aug 26, 12:35 PM CDT | Mesoscale Discussion | SPC | 85 min |
| Aug 26, 2:38 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Aug 26, 2:43 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 29, 11:59 AM CDT | Flood Watch | DLH | 9 hr |
| Aug 29, 2:15 PM CDT | Severe Thunderstorm Warning | DLH | 45 min |
| Aug 29, 2:33 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 29, 3:45 PM CDT | Severe Thunderstorm Warning | DLH | 59 min |
| Sep 29, 4:04 PM CDT | Fire Weather Watch | DLH | 12 hr |
| Sep 30, 3:40 AM CDT | Red Flag Warning | DLH | 17 hr |
| Oct 3, 1:39 PM CDT | Frost Advisory | DLH | 19 hr |
| Oct 5, 1:58 PM CDT | Wind Advisory | DLH | 27 hr |
| Oct 7, 2:41 PM CDT | Frost Advisory | DLH | 17 hr |
| Oct 16, 2:40 PM CDT | Fire Weather Watch | DLH | 11 hr |
| Oct 17, 1:47 AM CDT | Red Flag Warning | DLH | 17 hr |
| Nov 6, 2:18 AM CST | Dense Fog Advisory | DLH | 5 hr |
| Nov 15, 2:09 AM CST | Dense Fog Advisory | DLH | 10 hr |
| Nov 15, 8:49 PM CST | Dense Fog Advisory | DLH | 5 hr |
| Nov 24, 2:29 AM CST | Winter Weather Advisory | DLH | 40 hr |
| Dec 3, 1:20 PM CST | Wind Advisory | DLH | 38 hr |
| Dec 4, 2:53 AM CST | Winter Weather Advisory | DLH | 27 hr |
| Dec 7, 2:16 PM CST | Winter Weather Advisory | DLH | 47 hr |
| Dec 11, 2:24 AM CST | Cold Weather Advisory | DLH | 32 hr |
| Dec 13, 12:54 PM CST | Winter Weather Advisory | DLH | 49 hr |
| Dec 18, 1:15 PM CST | Winter Storm Warning | DLH | 24 hr |
| Dec 18, 1:15 PM CST | Winter Weather Advisory | DLH | 42 hr |
| Dec 23, 9:00 PM CST | Dense Fog Advisory | DLH | 12 hr |
| Dec 26, 1:09 PM CST | Dense Fog Advisory | DLH | 45 hr |
| Dec 28, 7:55 PM CST | Dense Fog Advisory | DLH | 49 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 | 26 |
| Tornado Warning | 4 |
| Severe Thunderstorm Watch | 9 |
| Tornado Watch | 1 |
| Mesoscale Discussion | 15 |
| Special Weather Statement | 10 |
| Flooding | |
| Areal Flood Warning | 1 |
| Flash Flood Warning | 1 |
| Flood Watch | 4 |
| Areal Flood Advisory | 4 |
| Winter | |
| Winter Storm Warning | 2 |
| Winter Storm Watch | 1 |
| Winter Weather Advisory | 7 |
| Cold | |
| Cold Weather Advisory | 1 |
| Frost Advisory | 2 |
| Wind Chill Advisory | 2 |
| Wind and dust | |
| Wind Advisory | 3 |
| Fire | |
| Red Flag Warning | 2 |
| Fire Weather Watch | 2 |
| Fog and smoke | |
| Dense Fog Advisory | 12 |
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.