Alert archive / Minnesota / Isanti County
Weather alerts in Isanti County, Minnesota, 2020
77 weather alerts in 2020, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Isanti County and its neighbors
Each county as a circle sized by its count in 2020. Tap one for its archive.
- Alerts
- 77
- Warnings
- 11
- Watches
- 13
- Advisories
- 24
- Busiest month
- July22 alerts
- Busiest day
- July 18, 20209 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 2 tornado warnings covering Isanti County in 2020 had a tornado report inside them; 0 of 1 tornado reports fell inside a warning.
Isanti County, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 2 | 1 | 50% | 1 | 0% | |
| Severe thunderstorm warnings | 3 | 1 | 67% | 5 | 80% | 46 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Twin Cities, MN: tornado warnings | 47 | 15 | 68% | 41 | 59% | 12 min |
| NWS Twin Cities, MN: severe thunderstorm warnings | 194 | 98 | 49% | 328 | 70% | 20 min |
| NWS Twin Cities, MN: flash flood warnings | 18 | 10 | 44% | 26 | 85% | 126 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, 2:42 PM CST | Wind Advisory | MPX | 25 hr |
| Jan 15, 2:53 PM CST | Wind Chill Advisory | MPX | 18 hr |
| Jan 15, 2:53 PM CST | Winter Storm Watch | MPX | 21 hr |
| Jan 16, 11:31 AM CST | Winter Storm Warning | MPX | 54 hr |
| Jan 22, 3:49 PM CST | Dense Fog Advisory | MPX | 20 hr |
| Feb 8, 4:30 AM CST | Winter Weather Advisory | MPX | 34 hr |
| Feb 11, 8:13 PM CST | Wind Chill Advisory | MPX | 40 hr |
| Feb 13, 2:55 PM CST | Wind Chill Advisory | MPX | 18 hr |
| Mar 28, 3:19 AM CDT | Winter Weather Advisory | MPX | 27 hr |
| Apr 2, 3:35 AM CDT | Winter Weather Advisory | MPX | 42 hr |
| Apr 19, 2:39 PM CDT | Fire Weather Watch | MPX | 13 hr |
| Apr 20, 3:49 AM CDT | Red Flag Warning | MPX | 14 hr |
| May 1, 2:33 PM CDT | Fire Weather Watch | MPX | 14 hr |
| May 2, 4:04 AM CDT | Red Flag Warning | MPX | 15 hr |
| May 24, 1:54 AM CDT | Dense Fog Advisory | MPX | 7 hr |
| May 26, 4:56 PM CDT | Flash Flood Watch | MPX | 11 hr |
| Jun 2, 1:27 PM CDT | Mesoscale Discussion | SPC | 93 min |
| Jun 2, 2:45 PM CDT | Special Weather Statement | MPX | 30 min |
| Jun 2, 3:14 PM CDT | Special Weather Statement | MPX | 46 min |
| Jun 7, 2:03 AM CDT | Severe Thunderstorm Warning | MPX | 57 min |
| Jun 7, 2:18 AM CDT | Mesoscale Discussion | SPC | 117 min |
| Jun 7, 2:56 AM CDT | Special Weather Statement | MPX | 64 min |
| Jun 29, 1:31 AM CDT | Flash Flood Watch | MPX | 10 hr |
| Jun 29, 11:58 PM CDT | Special Weather Statement | MPX | 2 hr |
| Jun 30, 4:44 AM CDT | Special Weather Statement | MPX | 3 hr |
| Jul 7, 3:05 PM CDT | Heat Advisory | MPX | 29 hr |
| Jul 8, 7:08 AM CDT | Special Weather Statement | MPX | 67 min |
| Jul 8, 4:15 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 8, 6:17 PM CDT | Mesoscale Discussion | SPC | 118 min |
| Jul 8, 9:51 PM CDT | Mesoscale Discussion | SPC | 114 min |
| Jul 9, 4:05 AM CDT | Special Weather Statement | MPX | 25 min |
| Jul 11, 12:06 PM CDT | Mesoscale Discussion | SPC | 114 min |
| Jul 16, 3:36 PM CDT | Excessive Heat Watch | MPX | 23 hr |
| Jul 17, 2:24 PM CDT | Heat Advisory | MPX | 31 hr |
| Jul 17, 5:09 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 17, 5:39 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 17, 7:57 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 17, 10:25 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 17, 11:36 PM CDT | Mesoscale Discussion | SPC | 114 min |
| Jul 18, 12:26 AM CDT | Severe Thunderstorm Warning | MPX | 49 min |
| Jul 18, 1:03 AM CDT | Tornado Warning | MPX | 27 min |
| Jul 18, 1:19 AM CDT | Special Weather Statement | MPX | 56 min |
| Jul 18, 3:12 PM CDT | Mesoscale Discussion | SPC | 93 min |
| Jul 18, 3:53 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 18, 6:15 PM CDT | Mesoscale Discussion | SPC | 60 min |
| Jul 21, 1:43 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 23, 2:37 PM CDT | Heat Advisory | MPX | 66 hr |
| Aug 7, 2:30 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 7, 3:52 PM CDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Aug 7, 8:02 PM CDT | Mesoscale Discussion | SPC | 118 min |
| Aug 7, 11:25 PM CDT | Mesoscale Discussion | SPC | 95 min |
| Aug 14, 5:38 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Aug 14, 6:28 PM CDT | Tornado Warning | MPX | 32 min |
| Aug 14, 6:53 PM CDT | Severe Thunderstorm Warning | MPX | 37 min |
| Aug 14, 7:28 PM CDT | Mesoscale Discussion | SPC | 92 min |
| Aug 21, 9:54 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 9, 2:45 AM CDT | Frost Advisory | MPX | 28 hr |
| Sep 10, 2:44 PM CDT | Frost Advisory | MPX | 18 hr |
| Sep 17, 11:03 AM CDT | Frost Advisory | MPX | 21 hr |
| Sep 25, 12:25 AM CDT | Dense Fog Advisory | MPX | 8 hr |
| Oct 13, 2:15 PM CDT | Wind Advisory | MPX | 34 hr |
| Oct 19, 2:46 PM CDT | Winter Weather Advisory | MPX | 34 hr |
| Oct 20, 12:23 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Oct 31, 1:55 PM CDT | Wind Advisory | MPX | 20 hr |
| Nov 7, 1:06 PM CST | Wind Advisory | MPX | 29 hr |
| Nov 9, 2:46 PM CST | Winter Storm Watch | MPX | 14 hr |
| Nov 9, 8:44 PM CST | Winter Weather Advisory | MPX | 29 hr |
| Nov 10, 4:52 AM CST | Winter Storm Warning | MPX | 21 hr |
| Nov 10, 3:51 PM CST | Mesoscale Discussion | SPC | 6 hr |
| Nov 24, 8:40 PM CST | Dense Fog Advisory | MPX | 8 hr |
| Dec 22, 3:49 AM CST | Winter Storm Watch | MPX | 23 hr |
| Dec 22, 2:50 PM CST | Winter Storm Warning | MPX | 36 hr |
| Dec 22, 9:08 PM CST | Blizzard Warning | MPX | 30 hr |
| Dec 23, 12:33 PM CST | Mesoscale Discussion | SPC | 4 hr |
| Dec 23, 5:15 PM CST | Mesoscale Discussion | SPC | 6 hr |
| Dec 24, 2:43 AM CST | Wind Chill Advisory | MPX | 9 hr |
| Dec 28, 3:18 AM CST | Winter Weather Advisory | MPX | 47 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 | 3 |
| Tornado Warning | 2 |
| Severe Thunderstorm Watch | 5 |
| Mesoscale Discussion | 21 |
| Special Weather Statement | 8 |
| Flooding | |
| Flash Flood Watch | 2 |
| Winter | |
| Blizzard Warning | 1 |
| Winter Storm Warning | 3 |
| Winter Storm Watch | 3 |
| Winter Weather Advisory | 6 |
| Heat | |
| Excessive Heat Watch | 1 |
| Heat Advisory | 3 |
| Cold | |
| Frost Advisory | 3 |
| Wind Chill Advisory | 4 |
| Wind and dust | |
| Wind Advisory | 4 |
| Fire | |
| Red Flag Warning | 2 |
| Fire Weather Watch | 2 |
| Fog and smoke | |
| Dense Fog Advisory | 4 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20192021
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.