Alert archive / Minnesota / Isanti County
Weather alerts in Isanti County, Minnesota, 2012
112 weather alerts in 2012, 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 2012. Tap one for its archive.
- Alerts
- 112
- Warnings
- 27
- Watches
- 20
- Advisories
- 20
- Busiest month
- May28 alerts
- Busiest day
- May 28, 201210 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, 2012
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 16 | 9 | 44% | 3 | 100% | 20 min |
| Flash flood warnings | 1 | 0 | 100% | 0 |
Each office's whole area, 2012
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Twin Cities, MN: tornado warnings | 39 | 6 | 85% | 21 | 33% | 10 min |
| NWS Twin Cities, MN: severe thunderstorm warnings | 282 | 145 | 49% | 470 | 70% | 22 min |
| NWS Twin Cities, MN: flash flood warnings | 14 | 6 | 57% | 26 | 42% | 153 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 |
|---|---|---|---|
| Dec 31, 8:54 PM CST | Winter Weather Advisory | MPX | 7 hr |
| Jan 18, 3:32 AM CST | Extreme Cold Warning | MPX | 32 hr |
| Jan 22, 4:48 AM CST | Freezing Rain Advisory | MPX | 11 hr |
| Jan 22, 3:41 PM CST | Winter Weather Advisory | MPX | 24 hr |
| Feb 1, 7:48 PM CST | Dense Fog Advisory | MPX | 14 hr |
| Feb 2, 2:46 PM CST | Dense Fog Advisory | MPX | 19 hr |
| Feb 4, 1:46 AM CST | Dense Fog Advisory | MPX | 8 hr |
| Feb 20, 4:58 AM CST | Winter Weather Advisory | MPX | 25 hr |
| Feb 26, 3:38 AM CST | Winter Storm Watch | MPX | 37 hr |
| Feb 27, 4:26 PM CST | Winter Storm Warning | MPX | 46 hr |
| Feb 28, 2:40 PM CST | Mesoscale Discussion | SPC | 4 hr |
| Feb 28, 8:41 PM CST | Mesoscale Discussion | SPC | 6 hr |
| Mar 19, 7:37 PM CDT | Severe Thunderstorm Warning | MPX | 38 min |
| Mar 23, 3:21 PM CDT | Dense Fog Advisory | MPX | 20 hr |
| Mar 26, 2:19 PM CDT | Wind Advisory | MPX | 29 hr |
| Apr 7, 3:14 PM CDT | Fire Weather Watch | MPX | 13 hr |
| Apr 8, 4:23 AM CDT | Red Flag Warning | MPX | 16 hr |
| Apr 8, 3:21 PM CDT | Freeze Watch | MPX | 11 hr |
| Apr 9, 2:37 AM CDT | Freeze Warning | MPX | 31 hr |
| Apr 9, 8:48 PM CDT | Freeze Warning | MPX | 37 hr |
| Apr 11, 2:28 PM CDT | Freeze Warning | MPX | 19 hr |
| Apr 15, 12:05 PM CDT | Special Weather Statement | MPX | 55 min |
| Apr 15, 3:37 PM CDT | Tornado Watch | SPC | 7 hr |
| Apr 26, 2:24 PM CDT | Frost Advisory | MPX | 18 hr |
| May 1, 6:10 PM CDT | Tornado Watch | SPC | 6 hr |
| May 1, 6:11 PM CDT | Mesoscale Discussion | SPC | 94 min |
| May 1, 6:14 PM CDT | Severe Thunderstorm Warning | MPX | 46 min |
| May 1, 7:23 PM CDT | Special Weather Statement | MPX | 52 min |
| May 1, 7:30 PM CDT | Severe Thunderstorm Warning | MPX | 45 min |
| May 1, 8:08 PM CDT | Severe Thunderstorm Warning | MPX | 37 min |
| May 5, 7:58 PM CDT | Special Weather Statement | MPX | 47 min |
| May 18, 4:54 PM CDT | Mesoscale Discussion | SPC | 66 min |
| May 19, 1:49 PM CDT | Mesoscale Discussion | SPC | 86 min |
| May 19, 6:54 PM CDT | Severe Thunderstorm Warning | MPX | 38 min |
| May 19, 7:05 PM CDT | Severe Thunderstorm Warning | MPX | 55 min |
| May 20, 1:43 AM CDT | Special Weather Statement | MPX | 47 min |
| May 23, 3:23 AM CDT | Flash Flood Watch | MPX | 34 hr |
| May 23, 5:27 PM CDT | Mesoscale Discussion | SPC | 93 min |
| May 26, 10:30 PM CDT | Special Weather Statement | MPX | 60 min |
| May 27, 3:32 AM CDT | Flash Flood Watch | MPX | 26 hr |
| May 27, 3:49 PM CDT | Mesoscale Discussion | SPC | 56 min |
| May 27, 6:08 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 27, 7:47 PM CDT | Mesoscale Discussion | SPC | 88 min |
| May 27, 8:29 PM CDT | Severe Thunderstorm Warning | MPX | 46 min |
| May 27, 8:58 PM CDT | Severe Thunderstorm Warning | MPX | 62 min |
| May 27, 9:43 PM CDT | Severe Thunderstorm Warning | MPX | 62 min |
| May 27, 9:46 PM CDT | Flash Flood Warning | MPX | 6 hr |
| May 27, 10:11 PM CDT | Mesoscale Discussion | SPC | 94 min |
| May 28, 1:48 PM CDT | Mesoscale Discussion | SPC | 57 min |
| May 28, 2:07 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 28, 3:26 PM CDT | Special Weather Statement | MPX | 79 min |
| May 28, 3:58 PM CDT | Mesoscale Discussion | SPC | 92 min |
| Jun 10, 3:03 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 10, 5:38 PM CDT | Mesoscale Discussion | SPC | 67 min |
| Jun 10, 6:33 PM CDT | Severe Thunderstorm Warning | MPX | 57 min |
| Jun 10, 7:35 PM CDT | Special Weather Statement | MPX | 55 min |
| Jun 10, 7:54 PM CDT | Severe Thunderstorm Warning | MPX | 36 min |
| Jun 10, 8:32 PM CDT | Severe Thunderstorm Warning | MPX | 58 min |
| Jun 10, 8:50 PM CDT | Special Weather Statement | MPX | 40 min |
| Jun 10, 9:29 PM CDT | Severe Thunderstorm Warning | MPX | 61 min |
| Jun 14, 4:36 AM CDT | Special Weather Statement | MPX | 39 min |
| Jun 14, 7:37 AM CDT | Mesoscale Discussion | SPC | 113 min |
| Jun 14, 9:11 AM CDT | Special Weather Statement | MPX | 49 min |
| Jun 17, 7:27 PM CDT | Mesoscale Discussion | SPC | 93 min |
| Jun 17, 7:57 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 18, 4:31 PM CDT | Flash Flood Watch | MPX | 56 hr |
| Jun 19, 2:39 AM CDT | Mesoscale Discussion | SPC | 66 min |
| Jun 19, 6:08 PM CDT | Tornado Watch | SPC | 7 hr |
| Jun 19, 9:12 PM CDT | Mesoscale Discussion | SPC | 93 min |
| Jun 19, 11:37 PM CDT | Mesoscale Discussion | SPC | 83 min |
| Jun 20, 9:40 AM CDT | Mesoscale Discussion | SPC | 95 min |
| Jun 20, 9:43 AM CDT | Special Weather Statement | MPX | 47 min |
| Jul 1, 4:14 PM CDT | Heat Advisory | MPX | 37 hr |
| Jul 2, 3:06 PM CDT | Excessive Heat Warning | MPX | 4 days |
| Jul 3, 2:00 AM CDT | Mesoscale Discussion | SPC | 90 min |
| Jul 4, 8:59 PM CDT | Tornado Watch | SPC | 5 hr |
| Jul 5, 12:34 AM CDT | Severe Thunderstorm Warning | MPX | 41 min |
| Jul 6, 6:02 PM CDT | Mesoscale Discussion | SPC | 28 min |
| Jul 6, 6:39 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 6, 9:33 PM CDT | Mesoscale Discussion | SPC | 57 min |
| Jul 13, 1:35 PM CDT | Mesoscale Discussion | SPC | 55 min |
| Jul 13, 4:02 PM CDT | Special Weather Statement | MPX | 43 min |
| Jul 15, 3:41 AM CDT | Heat Advisory | MPX | 41 hr |
| Jul 18, 9:16 AM CDT | Special Weather Statement | MPX | 59 min |
| Jul 20, 12:10 PM CDT | Special Weather Statement | MPX | 65 min |
| Jul 21, 5:21 AM CDT | Areal Flood Advisory | MPX | 3 hr |
| Jul 24, 11:24 PM CDT | Mesoscale Discussion | SPC | 96 min |
| Jul 25, 2:24 AM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 25, 5:24 AM CDT | Mesoscale Discussion | SPC | 66 min |
| Aug 1, 4:14 PM CDT | Mesoscale Discussion | SPC | 91 min |
| Aug 3, 7:33 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 3, 10:33 PM CDT | Mesoscale Discussion | SPC | 87 min |
| Aug 3, 10:44 PM CDT | Severe Thunderstorm Warning | MPX | 46 min |
| Aug 3, 11:12 PM CDT | Severe Thunderstorm Warning | MPX | 33 min |
| Aug 15, 2:56 PM CDT | Mesoscale Discussion | SPC | 64 min |
| Aug 15, 3:25 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Aug 15, 5:49 PM CDT | Mesoscale Discussion | SPC | 86 min |
| Aug 15, 8:20 PM CDT | Mesoscale Discussion | SPC | 85 min |
| Aug 22, 3:07 PM CDT | Special Weather Statement | MPX | 38 min |
| Aug 23, 6:31 PM CDT | Special Weather Statement | MPX | 44 min |
| Sep 9, 12:05 PM CDT | Red Flag Warning | MPX | 57 hr |
| Sep 17, 2:16 PM CDT | Frost Advisory | MPX | 17 hr |
| Sep 21, 3:03 PM CDT | Freeze Watch | MPX | 12 hr |
| Sep 22, 3:14 AM CDT | Freeze Warning | MPX | 29 hr |
| Oct 3, 2:31 PM CDT | Wind Advisory | MPX | 28 hr |
| Oct 23, 3:24 PM CDT | Dense Fog Advisory | MPX | 15 hr |
| Nov 22, 7:07 PM CST | Winter Weather Advisory | MPX | 11 hr |
| Dec 1, 3:03 PM CST | Freezing Fog Advisory | MPX | 21 hr |
| Dec 7, 4:18 AM CST | Winter Storm Watch | MPX | 23 hr |
| Dec 7, 3:49 PM CST | Winter Storm Warning | MPX | 56 hr |
| Dec 13, 9:37 PM CST | Dense Fog Advisory | MPX | 10 hr |
| Dec 14, 4:37 AM CST | Winter Weather Advisory | MPX | 43 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 archive20112013
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.