Alert archive / Illinois / Iroquois County
Weather alerts in Iroquois County, Illinois, 2012
144 weather alerts in 2012, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Iroquois County and its neighbors
Each county as a circle sized by its count in 2012. Tap one for its archive.
- Alerts
- 144
- Warnings
- 53
- Watches
- 22
- Advisories
- 32
- Busiest month
- May32 alerts
- Busiest day
- May 6, 201215 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
2 of 3 tornado warnings covering Iroquois County in 2012 had a tornado report inside them; 2 of 3 tornado reports fell inside a warning, on average 19 minutes after it went out.
Iroquois County, 2012
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 3 | 2 | 33% | 3 | 67% | 19 min |
| Severe thunderstorm warnings | 25 | 9 | 64% | 6 | 33% | 35 min |
| Flash flood warnings | 6 | 4 | 33% | 2 | 100% | 30 min |
Each office's whole area, 2012
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Chicago, IL: tornado warnings | 9 | 3 | 67% | 6 | 50% | 16 min |
| NWS Chicago, IL: severe thunderstorm warnings | 126 | 74 | 41% | 311 | 82% | 30 min |
| NWS Chicago, IL: flash flood warnings | 18 | 13 | 28% | 33 | 79% | 88 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, 2:05 PM CST | Winter Weather Advisory | LOT | 43 hr |
| Jan 22, 8:25 PM CST | Mesoscale Discussion | SPC | 2 hr |
| Feb 1, 10:14 PM CST | Dense Fog Advisory | LOT | 15 hr |
| Feb 2, 8:43 PM CST | Dense Fog Advisory | LOT | 15 hr |
| Feb 5, 3:55 AM CST | Dense Fog Advisory | LOT | 8 hr |
| Feb 6, 2:49 AM CST | Dense Fog Advisory | LOT | 9 hr |
| Feb 29, 3:59 AM CST | Wind Advisory | LOT | 14 hr |
| Mar 2, 11:44 AM CST | Wind Advisory | LOT | 12 hr |
| Mar 6, 3:23 AM CST | Wind Advisory | LOT | 15 hr |
| Mar 7, 3:18 AM CST | Wind Advisory | LOT | 15 hr |
| Mar 9, 4:56 PM CST | Fire Weather Watch | LOT | 13 hr |
| Mar 10, 5:30 AM CST | Red Flag Warning | LOT | 13 hr |
| Mar 15, 5:02 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Mar 20, 1:08 PM CDT | Red Flag Warning | LOT | 6 hr |
| Mar 23, 3:17 PM CDT | Mesoscale Discussion | SPC | 58 min |
| Mar 23, 3:26 PM CDT | Severe Thunderstorm Warning | LOT | 64 min |
| Mar 23, 3:39 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Mar 23, 4:44 PM CDT | Special Weather Statement | LOT | 46 min |
| Mar 23, 5:17 PM CDT | Severe Thunderstorm Warning | LOT | 58 min |
| Mar 23, 7:01 PM CDT | Mesoscale Discussion | SPC | 59 min |
| Mar 28, 4:58 AM CDT | Fire Weather Watch | LOT | 6 hr |
| Mar 28, 10:58 AM CDT | Red Flag Warning | LOT | 8 hr |
| Apr 3, 2:17 PM CDT | Mesoscale Discussion | SPC | 88 min |
| Apr 3, 5:45 PM CDT | Special Weather Statement | LOT | 30 min |
| Apr 4, 3:46 PM CDT | Freeze Watch | LOT | 24 hr |
| Apr 5, 3:40 PM CDT | Freeze Warning | LOT | 16 hr |
| Apr 7, 3:50 PM CDT | Fire Weather Watch | LOT | 18 hr |
| Apr 8, 4:42 PM CDT | Fire Weather Watch | LOT | 12 hr |
| Apr 9, 4:49 AM CDT | Red Flag Warning | LOT | 15 hr |
| Apr 10, 3:36 AM CDT | Freeze Watch | LOT | 11 hr |
| Apr 10, 3:36 AM CDT | Freeze Warning | LOT | 28 hr |
| Apr 10, 4:27 AM CDT | Fire Weather Watch | LOT | 3 hr |
| Apr 10, 7:34 AM CDT | Red Flag Warning | LOT | 11 hr |
| Apr 11, 3:49 AM CDT | Freeze Warning | LOT | 28 hr |
| Apr 15, 10:18 AM CDT | Wind Advisory | LOT | 10 hr |
| Apr 15, 6:12 PM CDT | Mesoscale Discussion | SPC | 63 min |
| Apr 16, 8:28 AM CDT | Wind Advisory | LOT | 10 hr |
| Apr 22, 5:38 AM CDT | Fire Weather Watch | LOT | 12 hr |
| Apr 22, 3:36 PM CDT | Freeze Warning | LOT | 12 hr |
| Apr 22, 5:37 PM CDT | Red Flag Warning | LOT | 25 hr |
| May 3, 6:41 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| May 3, 10:29 PM CDT | Mesoscale Discussion | SPC | 61 min |
| May 3, 11:34 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| May 4, 1:26 AM CDT | Severe Thunderstorm Warning | LOT | 63 min |
| May 4, 2:16 AM CDT | Mesoscale Discussion | SPC | 119 min |
| May 5, 3:29 AM CDT | Dense Fog Advisory | LOT | 6 hr |
| May 6, 3:56 AM CDT | Flash Flood Watch | LOT | 27 hr |
| May 6, 1:42 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 6, 1:56 PM CDT | Severe Thunderstorm Warning | LOT | 64 min |
| May 6, 2:57 PM CDT | Severe Thunderstorm Warning | LOT | 63 min |
| May 6, 3:19 PM CDT | Flash Flood Warning | LOT | 6 hr |
| May 6, 3:26 PM CDT | Tornado Warning | LOT | 64 min |
| May 6, 3:41 PM CDT | Severe Thunderstorm Warning | LOT | 64 min |
| May 6, 3:56 PM CDT | Mesoscale Discussion | SPC | 64 min |
| May 6, 4:02 PM CDT | Severe Thunderstorm Warning | LOT | 48 min |
| May 6, 4:46 PM CDT | Tornado Warning | LOT | 44 min |
| May 6, 4:56 PM CDT | Severe Thunderstorm Warning | LOT | 64 min |
| May 6, 5:01 PM CDT | Severe Thunderstorm Warning | LOT | 59 min |
| May 6, 5:07 PM CDT | Mesoscale Discussion | SPC | 53 min |
| May 6, 5:15 PM CDT | Flash Flood Warning | LOT | 6 hr |
| May 6, 5:25 PM CDT | Tornado Warning | LOT | 50 min |
| May 6, 9:40 PM CDT | River Flood Advisory | LOT | 67 hr |
| May 7, 12:26 AM CDT | Flash Flood Warning | LOT | 7 hr |
| May 7, 1:43 AM CDT | Flash Flood Warning | LOT | 6 hr |
| May 7, 7:00 AM CDT | Areal Flood Warning | LOT | 22 hr |
| May 7, 3:36 PM CDT | River Flood Advisory | LOT | 7 hr |
| May 7, 10:12 PM CDT | River Flood Warning | LOT | 11 hr |
| May 7, 10:17 PM CDT | Dense Fog Advisory | LOT | 8 hr |
| May 8, 8:43 AM CDT | River Flood Advisory | LOT | 34 hr |
| May 20, 8:38 PM CDT | Severe Thunderstorm Warning | LOT | 54 min |
| May 24, 4:17 AM CDT | Wind Advisory | LOT | 16 hr |
| May 24, 10:56 AM CDT | Red Flag Warning | LOT | 9 hr |
| Jun 2, 1:05 PM CDT | Mesoscale Discussion | SPC | 115 min |
| Jun 16, 3:06 PM CDT | Special Weather Statement | LOT | 54 min |
| Jun 16, 6:40 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 16, 7:58 PM CDT | Mesoscale Discussion | SPC | 92 min |
| Jun 16, 8:20 PM CDT | Severe Thunderstorm Warning | LOT | 55 min |
| Jun 16, 8:40 PM CDT | Severe Thunderstorm Warning | LOT | 54 min |
| Jun 16, 9:38 PM CDT | Areal Flood Advisory | LOT | 51 min |
| Jun 16, 10:19 PM CDT | Flash Flood Warning | LOT | 4 hr |
| Jun 16, 10:30 PM CDT | Mesoscale Discussion | SPC | 90 min |
| Jun 16, 10:59 PM CDT | Severe Thunderstorm Warning | LOT | 76 min |
| Jun 17, 2:05 AM CDT | Areal Flood Warning | LOT | 6 hr |
| Jun 27, 4:22 AM CDT | Heat Advisory | LOT | 39 hr |
| Jun 29, 3:19 AM CDT | Heat Advisory | LOT | 12 hr |
| Jun 29, 9:22 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 29, 10:49 AM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 29, 7:33 PM CDT | Mesoscale Discussion | SPC | 87 min |
| Jun 29, 11:24 PM CDT | Severe Thunderstorm Warning | LOT | 81 min |
| Jun 29, 11:46 PM CDT | Mesoscale Discussion | SPC | 119 min |
| Jun 30, 2:25 AM CDT | Special Weather Statement | LOT | 35 min |
| Jun 30, 3:05 AM CDT | Severe Thunderstorm Warning | LOT | 55 min |
| Jul 1, 11:33 AM CDT | Mesoscale Discussion | SPC | 57 min |
| Jul 1, 12:07 PM CDT | Severe Thunderstorm Warning | LOT | 31 min |
| Jul 1, 12:16 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 3, 3:28 AM CDT | Heat Advisory | LOT | 37 hr |
| Jul 4, 3:15 AM CDT | Excessive Heat Warning | LOT | 4 days |
| Jul 7, 4:34 PM CDT | Special Weather Statement | LOT | 41 min |
| Jul 14, 2:33 PM CDT | Special Weather Statement | LOT | 42 min |
| Jul 14, 3:14 PM CDT | Special Weather Statement | LOT | 31 min |
| Jul 16, 2:51 PM CDT | Heat Advisory | LOT | 52 hr |
| Jul 18, 12:58 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 18, 3:07 PM CDT | Mesoscale Discussion | SPC | 53 min |
| Jul 24, 7:04 AM CDT | Severe Thunderstorm Warning | LOT | 56 min |
| Jul 24, 3:31 PM CDT | Heat Advisory | LOT | 30 hr |
| Jul 26, 6:32 PM CDT | Special Weather Statement | LOT | 43 min |
| Jul 31, 7:25 AM CDT | Severe Thunderstorm Warning | LOT | 51 min |
| Jul 31, 7:56 AM CDT | Severe Thunderstorm Warning | LOT | 79 min |
| Jul 31, 1:13 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 31, 2:46 PM CDT | Special Weather Statement | LOT | 44 min |
| Jul 31, 3:35 PM CDT | Mesoscale Discussion | SPC | 55 min |
| Aug 4, 10:26 AM CDT | Mesoscale Discussion | SPC | 49 min |
| Aug 4, 1:46 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Aug 4, 4:39 PM CDT | Areal Flood Advisory | LOT | 73 min |
| Aug 5, 2:32 AM CDT | Flash Flood Warning | LOT | 6 hr |
| Aug 9, 3:16 PM CDT | Mesoscale Discussion | SPC | 89 min |
| Aug 9, 4:02 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Aug 9, 6:13 PM CDT | Severe Thunderstorm Warning | LOT | 62 min |
| Aug 9, 6:36 PM CDT | Severe Thunderstorm Warning | LOT | 37 min |
| Aug 9, 6:57 PM CDT | Severe Thunderstorm Warning | LOT | 63 min |
| Aug 9, 7:10 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 9, 7:40 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Aug 9, 7:41 PM CDT | Severe Thunderstorm Warning | LOT | 34 min |
| Aug 16, 12:27 PM CDT | Special Weather Statement | LOT | 33 min |
| Aug 16, 12:43 PM CDT | Severe Thunderstorm Warning | LOT | 47 min |
| Sep 1, 10:20 AM CDT | Areal Flood Advisory | LOT | 3 hr |
| Sep 5, 12:20 AM CDT | Special Weather Statement | LOT | 55 min |
| Sep 7, 4:20 PM CDT | Severe Thunderstorm Warning | LOT | 58 min |
| Sep 19, 4:14 AM CDT | Red Flag Warning | LOT | 15 hr |
| Sep 21, 1:36 PM CDT | Mesoscale Discussion | SPC | 84 min |
| Sep 22, 5:35 PM CDT | Frost Advisory | LOT | 14 hr |
| Sep 23, 3:20 PM CDT | Frost Advisory | LOT | 17 hr |
| Oct 7, 2:57 PM CDT | Freeze Warning | LOT | 18 hr |
| Oct 7, 5:15 PM CDT | Red Flag Warning | LOT | 25 hr |
| Oct 13, 3:07 PM CDT | Wind Advisory | LOT | 28 hr |
| Oct 14, 2:11 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Oct 22, 10:04 AM CDT | Mesoscale Discussion | SPC | 56 min |
| Oct 25, 6:22 PM CDT | Special Weather Statement | LOT | 53 min |
| Nov 11, 3:27 AM CST | Wind Advisory | LOT | 15 hr |
| Nov 20, 6:01 PM CST | Dense Fog Advisory | LOT | 20 hr |
| Dec 2, 7:01 PM CST | Dense Fog Advisory | LOT | 13 hr |
| Dec 19, 3:56 PM CST | High Wind Watch | LOT | 12 hr |
| Dec 20, 3:55 AM CST | High Wind Warning | LOT | 20 hr |
| Dec 21, 12:00 AM CST | Wind Advisory | LOT | 6 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 | 3 |
| Severe Thunderstorm Watch | 12 |
| Mesoscale Discussion | 25 |
| Special Weather Statement | 12 |
| Flooding | |
| Areal Flood Warning | 2 |
| Flash Flood Warning | 6 |
| River Flood Warning | 1 |
| Flash Flood Watch | 1 |
| Areal Flood Advisory | 3 |
| River Flood Advisory | 3 |
| Winter | |
| Winter Weather Advisory | 1 |
| Heat | |
| Excessive Heat Warning | 1 |
| Heat Advisory | 5 |
| Cold | |
| Freeze Warning | 5 |
| Freeze Watch | 2 |
| Frost Advisory | 2 |
| Wind and dust | |
| High Wind Warning | 1 |
| High Wind Watch | 1 |
| Wind Advisory | 10 |
| Fire | |
| Red Flag Warning | 9 |
| Fire Weather Watch | 6 |
| Fog and smoke | |
| Dense Fog Advisory | 8 |
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.