Alert archive / Minnesota / Cass County
Weather alerts in Cass County, Minnesota, 2010
142 weather alerts in 2010, 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 2010. Tap one for its archive.
- Alerts
- 142
- Warnings
- 45
- Watches
- 16
- Advisories
- 34
- Busiest month
- July39 alerts
- Busiest day
- June 17, 201015 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 7 tornado warnings covering Cass County in 2010 had a tornado report inside them.
Cass County, 2010
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 7 | 1 | 86% | 0 | ||
| Severe thunderstorm warnings | 25 | 8 | 68% | 13 | 77% | 20 min |
| Flash flood warnings | 3 | 0 | 100% | 0 |
Each office's whole area, 2010
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Duluth, MN: tornado warnings | 34 | 9 | 74% | 14 | 93% | 19 min |
| NWS Duluth, MN: severe thunderstorm warnings | 155 | 54 | 65% | 168 | 80% | 27 min |
| NWS Duluth, MN: flash flood warnings | 12 | 4 | 67% | 9 | 56% | 56 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 1, 3:06 AM CST | Wind Chill Advisory | DLH | 33 hr |
| Jan 7, 3:05 PM CST | Wind Chill Advisory | DLH | 19 hr |
| Jan 18, 8:29 PM CST | Dense Fog Advisory | DLH | 13 hr |
| Jan 21, 6:15 PM CST | Winter Weather Advisory | DLH | 9 hr |
| Jan 22, 3:40 AM CST | Winter Storm Watch | DLH | 25 hr |
| Jan 22, 3:01 PM CST | Winter Weather Advisory | DLH | 4 days |
| Jan 23, 7:42 AM CST | Ice Storm Warning | DLH | 9 hr |
| Jan 27, 3:13 PM CST | Wind Chill Advisory | DLH | 20 hr |
| Feb 4, 8:15 PM CST | Winter Weather Advisory | DLH | 7 hr |
| Feb 6, 3:34 PM CST | Winter Weather Advisory | DLH | 53 hr |
| Feb 13, 4:49 AM CST | Dense Fog Advisory | DLH | 5 hr |
| Mar 8, 6:36 AM CST | Dense Fog Advisory | DLH | 4 hr |
| Mar 12, 11:07 PM CST | Dense Fog Advisory | DLH | 11 hr |
| Mar 16, 6:43 PM CDT | Areal Flood Warning | DLH | 17 hr |
| Apr 10, 6:15 AM CDT | Fire Weather Watch | DLH | 4 hr |
| Apr 10, 10:17 AM CDT | Red Flag Warning | DLH | 10 hr |
| Apr 16, 4:33 AM CDT | Red Flag Warning | DLH | 15 hr |
| Apr 27, 2:51 PM CDT | Fire Weather Watch | DLH | 13 hr |
| Apr 28, 3:35 AM CDT | Red Flag Warning | DLH | 16 hr |
| Apr 29, 11:42 PM CDT | Dense Fog Advisory | DLH | 8 hr |
| May 7, 7:00 PM CDT | Winter Weather Advisory | DLH | 15 hr |
| May 22, 8:21 PM CDT | Mesoscale Discussion | SPC | 84 min |
| May 23, 1:36 AM CDT | Mesoscale Discussion | SPC | 84 min |
| May 23, 2:21 AM CDT | Severe Thunderstorm Warning | DLH | 55 min |
| May 24, 1:18 AM CDT | Special Weather Statement | DLH | 57 min |
| May 24, 1:49 AM CDT | Special Weather Statement | DLH | 41 min |
| May 24, 2:16 AM CDT | Severe Thunderstorm Warning | DLH | 29 min |
| May 24, 4:21 AM CDT | Mesoscale Discussion | SPC | 54 min |
| May 24, 7:50 AM CDT | Mesoscale Discussion | SPC | 55 min |
| Jun 15, 11:25 PM CDT | Dense Fog Advisory | DLH | 11 hr |
| Jun 17, 12:34 PM CDT | Severe Thunderstorm Warning | DLH | 26 min |
| Jun 17, 12:55 PM CDT | Severe Thunderstorm Warning | DLH | 35 min |
| Jun 17, 1:09 PM CDT | Mesoscale Discussion | SPC | 96 min |
| Jun 17, 1:24 PM CDT | Severe Thunderstorm Warning | DLH | 36 min |
| Jun 17, 1:47 PM CDT | Special Weather Statement | DLH | 28 min |
| Jun 17, 1:49 PM CDT | Severe Thunderstorm Warning | DLH | 26 min |
| Jun 17, 2:10 PM CDT | Severe Thunderstorm Warning | DLH | 50 min |
| Jun 17, 2:30 PM CDT | Tornado Watch | SPC | 9 hr |
| Jun 17, 3:31 PM CDT | Mesoscale Discussion | SPC | 59 min |
| Jun 17, 4:38 PM CDT | Special Weather Statement | DLH | 52 min |
| Jun 17, 5:32 PM CDT | Tornado Warning | DLH | 28 min |
| Jun 17, 5:57 PM CDT | Tornado Warning | DLH | 33 min |
| Jun 17, 6:28 PM CDT | Tornado Warning | DLH | 32 min |
| Jun 17, 6:55 PM CDT | Tornado Warning | DLH | 35 min |
| Jun 17, 6:57 PM CDT | Tornado Warning | DLH | 18 min |
| Jun 17, 7:17 PM CDT | Tornado Warning | DLH | 43 min |
| Jun 17, 7:39 PM CDT | Severe Thunderstorm Warning | DLH | 36 min |
| Jun 21, 6:42 PM CDT | Special Weather Statement | DLH | 63 min |
| Jun 21, 8:53 PM CDT | Special Weather Statement | DLH | 22 min |
| Jun 24, 2:54 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 3, 10:30 PM CDT | Special Weather Statement | DLH | 45 min |
| Jul 3, 11:10 PM CDT | Special Weather Statement | DLH | 40 min |
| Jul 4, 12:23 AM CDT | Special Weather Statement | DLH | 37 min |
| Jul 4, 1:45 AM CDT | Special Weather Statement | DLH | 45 min |
| Jul 4, 3:40 AM CDT | Flash Flood Warning | DLH | 4 hr |
| Jul 4, 4:33 AM CDT | Special Weather Statement | DLH | 12 min |
| Jul 10, 6:37 PM CDT | Mesoscale Discussion | SPC | 53 min |
| Jul 10, 6:39 PM CDT | Special Weather Statement | DLH | 36 min |
| Jul 10, 6:46 PM CDT | Severe Thunderstorm Warning | DLH | 59 min |
| Jul 11, 4:34 AM CDT | Special Weather Statement | DLH | 56 min |
| Jul 14, 3:50 AM CDT | Tornado Watch | SPC | 5 hr |
| Jul 14, 5:53 AM CDT | Severe Thunderstorm Warning | DLH | 37 min |
| Jul 14, 6:19 AM CDT | Mesoscale Discussion | SPC | 86 min |
| Jul 14, 6:34 AM CDT | Special Weather Statement | DLH | 11 min |
| Jul 14, 7:04 AM CDT | Severe Thunderstorm Warning | DLH | 56 min |
| Jul 14, 7:59 AM CDT | Severe Thunderstorm Warning | DLH | 61 min |
| Jul 14, 2:26 PM CDT | Special Weather Statement | DLH | 19 min |
| Jul 14, 3:13 PM CDT | Severe Thunderstorm Warning | DLH | 32 min |
| Jul 14, 3:42 PM CDT | Severe Thunderstorm Warning | DLH | 48 min |
| Jul 15, 5:55 PM CDT | Special Weather Statement | DLH | 35 min |
| Jul 15, 6:17 PM CDT | Severe Thunderstorm Warning | DLH | 58 min |
| Jul 15, 8:53 PM CDT | Special Weather Statement | DLH | 37 min |
| Jul 17, 12:17 PM CDT | Severe Thunderstorm Warning | DLH | 43 min |
| Jul 17, 12:28 PM CDT | Tornado Watch | SPC | 11 hr |
| Jul 17, 12:49 PM CDT | Tornado Warning | DLH | 26 min |
| Jul 17, 1:51 PM CDT | Special Weather Statement | DLH | 39 min |
| Jul 17, 2:25 PM CDT | Special Weather Statement | DLH | 50 min |
| Jul 17, 4:27 PM CDT | Severe Thunderstorm Warning | DLH | 33 min |
| Jul 17, 4:58 PM CDT | Severe Thunderstorm Warning | DLH | 47 min |
| Jul 17, 5:40 PM CDT | Flash Flood Warning | DLH | 119 min |
| Jul 24, 5:32 AM CDT | Special Weather Statement | DLH | 58 min |
| Jul 27, 1:24 AM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 27, 4:00 AM CDT | Special Weather Statement | DLH | 60 min |
| Jul 27, 6:32 AM CDT | Severe Thunderstorm Warning | DLH | 43 min |
| Jul 27, 7:01 AM CDT | Mesoscale Discussion | SPC | 89 min |
| Jul 27, 7:15 AM CDT | Severe Thunderstorm Warning | DLH | 45 min |
| Jul 27, 3:29 PM CDT | Tornado Watch | SPC | 7 hr |
| Jul 30, 7:26 PM CDT | Special Weather Statement | DLH | 49 min |
| Jul 30, 7:57 PM CDT | Special Weather Statement | DLH | 78 min |
| Aug 1, 8:14 PM CDT | Areal Flood Advisory | DLH | 6 hr |
| Aug 1, 8:52 PM CDT | Special Weather Statement | DLH | 53 min |
| Aug 2, 12:58 AM CDT | Flash Flood Warning | DLH | 4 hr |
| Aug 3, 1:18 AM CDT | Dense Fog Advisory | DLH | 6 hr |
| Aug 3, 7:06 AM CDT | Dense Fog Advisory | DLH | 55 min |
| Aug 7, 5:27 PM CDT | Tornado Watch | SPC | 8 hr |
| Aug 7, 8:27 PM CDT | Severe Thunderstorm Warning | DLH | 48 min |
| Aug 7, 8:57 PM CDT | Mesoscale Discussion | SPC | 93 min |
| Aug 7, 9:06 PM CDT | Severe Thunderstorm Warning | DLH | 39 min |
| Aug 7, 9:37 PM CDT | Severe Thunderstorm Warning | DLH | 38 min |
| Aug 8, 8:09 PM CDT | Mesoscale Discussion | SPC | 96 min |
| Aug 8, 8:22 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Aug 8, 10:27 PM CDT | Mesoscale Discussion | SPC | 93 min |
| Aug 9, 4:06 AM CDT | Dense Fog Advisory | DLH | 6 hr |
| Aug 12, 9:48 PM CDT | Flood Watch | DLH | 25 hr |
| Aug 17, 10:28 PM CDT | Special Weather Statement | DLH | 62 min |
| Aug 17, 11:58 PM CDT | Special Weather Statement | DLH | 62 min |
| Aug 18, 1:58 AM CDT | Special Weather Statement | DLH | 47 min |
| Aug 18, 2:51 AM CDT | Severe Thunderstorm Warning | DLH | 39 min |
| Aug 20, 1:42 AM CDT | Severe Thunderstorm Warning | DLH | 63 min |
| Aug 21, 9:21 PM CDT | Dense Fog Advisory | DLH | 12 hr |
| Aug 30, 9:20 PM CDT | Mesoscale Discussion | SPC | 55 min |
| Aug 30, 10:41 PM CDT | Special Weather Statement | DLH | 49 min |
| Aug 30, 11:30 PM CDT | Special Weather Statement | DLH | 45 min |
| Sep 2, 3:30 PM CDT | Special Weather Statement | DLH | 45 min |
| Sep 6, 6:12 PM CDT | Special Weather Statement | DLH | 33 min |
| Sep 17, 3:44 PM CDT | Frost Advisory | DLH | 12 hr |
| Sep 18, 3:33 PM CDT | Frost Advisory | DLH | 12 hr |
| Sep 20, 7:40 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 22, 4:02 AM CDT | Flood Watch | DLH | 48 hr |
| Sep 25, 3:33 AM CDT | Frost Advisory | DLH | 28 hr |
| Oct 1, 3:31 PM CDT | Frost Advisory | DLH | 16 hr |
| Oct 2, 2:41 PM CDT | Freeze Warning | DLH | 17 hr |
| Oct 25, 2:14 PM CDT | Wind Advisory | DLH | 49 hr |
| Oct 26, 3:44 PM CDT | Winter Storm Warning | DLH | 14 hr |
| Oct 26, 3:44 PM CDT | Winter Weather Advisory | DLH | 20 hr |
| Nov 12, 3:29 PM CST | Winter Weather Advisory | DLH | 44 hr |
| Nov 20, 2:55 PM CST | Winter Weather Advisory | DLH | 27 hr |
| Nov 22, 4:09 AM CST | Winter Weather Advisory | DLH | 19 hr |
| Nov 23, 3:31 PM CST | Winter Weather Advisory | DLH | 42 hr |
| Nov 28, 3:27 PM CST | Winter Storm Watch | DLH | 13 hr |
| Nov 29, 4:03 AM CST | Winter Storm Warning | DLH | 55 hr |
| Nov 29, 4:03 AM CST | Winter Weather Advisory | DLH | 55 hr |
| Dec 3, 3:47 AM CST | Winter Weather Advisory | DLH | 26 hr |
| Dec 10, 5:24 AM CST | Winter Weather Advisory | DLH | 34 hr |
| Dec 11, 3:20 PM CST | Wind Chill Advisory | DLH | 20 hr |
| Dec 12, 3:35 PM CST | Wind Chill Advisory | DLH | 20 hr |
| Dec 19, 3:42 AM CST | Winter Storm Watch | DLH | 12 hr |
| Dec 19, 3:53 PM CST | Winter Storm Warning | DLH | 56 hr |
| Dec 28, 9:46 PM CST | Winter Storm Watch | DLH | 18 hr |
| Dec 29, 3:53 PM CST | Winter Storm Warning | DLH | 68 hr |
| Dec 30, 11:35 AM CST | Mesoscale Discussion | SPC | 5 hr |
| Dec 30, 5:43 PM CST | Mesoscale Discussion | SPC | 4 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 | 25 |
| Tornado Warning | 7 |
| Severe Thunderstorm Watch | 3 |
| Tornado Watch | 5 |
| Mesoscale Discussion | 16 |
| Special Weather Statement | 31 |
| Flooding | |
| Areal Flood Warning | 1 |
| Flash Flood Warning | 3 |
| Flood Watch | 2 |
| Areal Flood Advisory | 1 |
| Winter | |
| Ice Storm Warning | 1 |
| Winter Storm Warning | 4 |
| Winter Storm Watch | 4 |
| Winter Weather Advisory | 13 |
| Cold | |
| Freeze Warning | 1 |
| Frost Advisory | 4 |
| Wind Chill Advisory | 5 |
| Wind and dust | |
| Wind Advisory | 1 |
| Fire | |
| Red Flag Warning | 3 |
| Fire Weather Watch | 2 |
| Fog and smoke | |
| Dense Fog Advisory | 10 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20092011
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.