Alert archive / Minnesota / Isanti County
Weather alerts in Isanti County, Minnesota, 2018
87 weather alerts in 2018, 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 2018. Tap one for its archive.
- Alerts
- 87
- Warnings
- 21
- Watches
- 14
- Advisories
- 22
- Busiest month
- May17 alerts
- Busiest day
- June 17, 20188 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Isanti County, 2018
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 11 | 7 | 36% | 5 | 100% | 23 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2018
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Twin Cities, MN: tornado warnings | 12 | 7 | 42% | 30 | 77% | 16 min |
| NWS Twin Cities, MN: severe thunderstorm warnings | 159 | 73 | 54% | 311 | 66% | 21 min |
| NWS Twin Cities, MN: flash flood warnings | 8 | 1 | 88% | 10 | 30% | 87 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, 10:54 AM CST | Wind Chill Advisory | MPX | 23 hr |
| Jan 9, 3:29 AM CST | Winter Storm Watch | MPX | 35 hr |
| Jan 10, 3:22 AM CST | Winter Weather Advisory | MPX | 39 hr |
| Jan 11, 12:02 PM CST | Wind Chill Advisory | MPX | 22 hr |
| Jan 12, 2:58 PM CST | Wind Chill Advisory | MPX | 18 hr |
| Jan 14, 3:41 AM CST | Wind Chill Advisory | MPX | 53 hr |
| Jan 31, 2:02 PM CST | Wind Chill Advisory | MPX | 22 hr |
| Feb 1, 2:10 PM CST | Wind Chill Advisory | MPX | 20 hr |
| Feb 3, 2:57 AM CST | Wind Chill Advisory | MPX | 33 hr |
| Feb 3, 2:57 AM CST | Winter Weather Advisory | MPX | 15 hr |
| Feb 18, 4:04 AM CST | Winter Weather Advisory | MPX | 56 hr |
| Feb 21, 2:59 PM CST | Winter Weather Advisory | MPX | 41 hr |
| Feb 22, 2:24 PM CST | Winter Storm Watch | MPX | 24 hr |
| Feb 23, 2:16 PM CST | Winter Storm Warning | MPX | 37 hr |
| Feb 24, 4:46 PM CST | Mesoscale Discussion | SPC | 5 hr |
| Mar 3, 3:39 AM CST | Winter Storm Watch | MPX | 36 hr |
| Mar 4, 3:10 PM CST | Winter Storm Warning | MPX | 36 hr |
| Mar 25, 3:35 PM CDT | Winter Weather Advisory | MPX | 30 hr |
| Mar 30, 3:49 AM CDT | Winter Storm Warning | MPX | 30 hr |
| Mar 30, 3:49 AM CDT | Winter Weather Advisory | MPX | 30 hr |
| Mar 30, 10:16 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Apr 2, 9:46 AM CDT | Winter Weather Advisory | MPX | 39 hr |
| Apr 3, 3:02 AM CDT | Winter Weather Advisory | MPX | 22 hr |
| Apr 11, 3:44 PM CDT | Winter Storm Watch | MPX | 47 hr |
| Apr 12, 9:34 PM CDT | Winter Storm Warning | MPX | 3 days |
| Apr 14, 6:02 PM CDT | Mesoscale Discussion | SPC | 6 hr |
| Apr 28, 3:13 PM CDT | Fire Weather Watch | MPX | 12 hr |
| Apr 29, 3:42 AM CDT | Red Flag Warning | MPX | 17 hr |
| May 3, 3:17 PM CDT | Fire Weather Watch | MPX | 13 hr |
| May 4, 3:50 AM CDT | Red Flag Warning | MPX | 15 hr |
| May 25, 5:20 PM CDT | Mesoscale Discussion | SPC | 115 min |
| May 25, 6:29 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 26, 2:24 PM CDT | Heat Advisory | MPX | 47 hr |
| May 27, 3:52 PM CDT | Heat Advisory | MPX | 27 hr |
| May 28, 5:49 PM CDT | Severe Thunderstorm Warning | MPX | 26 min |
| May 28, 5:59 PM CDT | Severe Thunderstorm Warning | MPX | 31 min |
| May 28, 6:09 PM CDT | Severe Thunderstorm Warning | MPX | 51 min |
| May 28, 6:13 PM CDT | Severe Thunderstorm Warning | MPX | 47 min |
| May 29, 1:43 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 29, 3:29 PM CDT | Special Weather Statement | MPX | 76 min |
| May 29, 3:39 PM CDT | Severe Thunderstorm Warning | MPX | 33 min |
| May 29, 3:49 PM CDT | Severe Thunderstorm Warning | MPX | 37 min |
| May 29, 3:54 PM CDT | Mesoscale Discussion | SPC | 96 min |
| May 29, 5:34 PM CDT | Mesoscale Discussion | SPC | 56 min |
| May 31, 1:00 AM CDT | Dense Fog Advisory | MPX | 8 hr |
| Jun 11, 12:09 PM CDT | Special Weather Statement | MPX | 66 min |
| Jun 16, 9:47 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 16, 11:44 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 17, 2:38 AM CDT | Mesoscale Discussion | SPC | 97 min |
| Jun 17, 12:12 PM CDT | Mesoscale Discussion | SPC | 93 min |
| Jun 17, 12:34 PM CDT | Tornado Watch | SPC | 8 hr |
| Jun 17, 2:44 PM CDT | Flash Flood Watch | MPX | 16 hr |
| Jun 17, 3:08 PM CDT | Mesoscale Discussion | SPC | 97 min |
| Jun 17, 5:23 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 28, 2:24 AM CDT | Excessive Heat Watch | MPX | 20 hr |
| Jun 28, 11:16 AM CDT | Mesoscale Discussion | SPC | 89 min |
| Jun 28, 2:46 PM CDT | Excessive Heat Warning | MPX | 31 hr |
| Jul 1, 12:06 PM CDT | Special Weather Statement | MPX | 54 min |
| Jul 3, 9:36 AM CDT | Special Weather Statement | MPX | 39 min |
| Jul 3, 10:25 AM CDT | High Wind Warning | MPX | 3 hr |
| Jul 4, 8:20 AM CDT | Special Weather Statement | MPX | 40 min |
| Jul 8, 7:58 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 12, 10:43 AM CDT | Special Weather Statement | MPX | 32 min |
| Jul 14, 3:04 AM CDT | Dense Fog Advisory | MPX | 5 hr |
| Aug 3, 12:05 PM CDT | Mesoscale Discussion | SPC | 55 min |
| Aug 3, 5:31 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 4, 12:05 AM CDT | Special Weather Statement | MPX | 25 min |
| Aug 4, 12:43 AM CDT | Special Weather Statement | MPX | 32 min |
| Aug 25, 2:54 AM CDT | Dense Fog Advisory | MPX | 7 hr |
| Aug 26, 4:03 AM CDT | Severe Thunderstorm Warning | MPX | 57 min |
| Aug 26, 4:56 AM CDT | Special Weather Statement | MPX | 64 min |
| Aug 26, 5:20 AM CDT | Severe Thunderstorm Warning | MPX | 40 min |
| Aug 26, 5:47 AM CDT | Severe Thunderstorm Warning | MPX | 43 min |
| Aug 27, 11:49 AM CDT | Mesoscale Discussion | SPC | 116 min |
| Aug 27, 2:03 PM CDT | Severe Thunderstorm Warning | MPX | 27 min |
| Aug 27, 2:24 PM CDT | Mesoscale Discussion | SPC | 96 min |
| Aug 27, 2:57 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 27, 5:32 PM CDT | Severe Thunderstorm Warning | MPX | 43 min |
| Aug 31, 7:11 PM CDT | Special Weather Statement | MPX | 49 min |
| Sep 12, 8:36 AM CDT | Special Weather Statement | MPX | 24 min |
| Sep 28, 3:21 AM CDT | Freeze Warning | MPX | 30 hr |
| Oct 7, 3:21 PM CDT | Flood Watch | MPX | 60 hr |
| Dec 12, 7:36 AM CST | Special Weather Statement | MPX | 114 min |
| Dec 13, 6:40 PM CST | Dense Fog Advisory | MPX | 15 hr |
| Dec 25, 3:29 AM CST | Winter Storm Watch | MPX | 24 hr |
| Dec 25, 2:44 PM CST | Winter Storm Warning | MPX | 3 days |
| Dec 30, 2:22 PM CST | Winter Weather Advisory | MPX | 31 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 | 11 |
| Severe Thunderstorm Watch | 3 |
| Tornado Watch | 1 |
| Mesoscale Discussion | 18 |
| Special Weather Statement | 12 |
| Flooding | |
| Flash Flood Watch | 1 |
| Flood Watch | 1 |
| Winter | |
| Winter Storm Warning | 5 |
| Winter Storm Watch | 5 |
| Winter Weather Advisory | 9 |
| Heat | |
| Excessive Heat Warning | 1 |
| Excessive Heat Watch | 1 |
| Heat Advisory | 2 |
| Cold | |
| Freeze Warning | 1 |
| Wind Chill Advisory | 7 |
| Wind and dust | |
| High Wind Warning | 1 |
| 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 archive20172019
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.