Alert archive / Illinois / Knox County
Weather alerts in Knox County, Illinois, 2024
145 weather alerts in 2024, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Knox County and its neighbors
Each county as a circle sized by its count in 2024. Tap one for its archive.
- Alerts
- 145
- Warnings
- 51
- Watches
- 25
- Advisories
- 24
- Busiest month
- July27 alerts
- Busiest day
- July 15, 202412 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 Knox County in 2024 had a tornado report inside them; 1 of 1 tornado reports fell inside a warning, on average 25 minutes after it went out.
Knox County, 2024
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 2 | 1 | 50% | 1 | 100% | 25 min |
| Severe thunderstorm warnings | 35 | 12 | 66% | 10 | 90% | 18 min |
| Flash flood warnings | 2 | 1 | 50% | 0 |
Each office's whole area, 2024
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Lincoln, IL: tornado warnings | 35 | 2 | 94% | 31 | 16% | 22 min |
| NWS Lincoln, IL: severe thunderstorm warnings | 218 | 93 | 57% | 459 | 75% | 22 min |
| NWS Lincoln, IL: flash flood warnings | 26 | 7 | 73% | 26 | 81% | 118 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 7, 2:58 AM CST | Winter Storm Watch | ILX | 24 hr |
| Jan 8, 2:39 AM CST | Winter Storm Warning | ILX | 48 hr |
| Jan 9, 9:12 AM CST | Mesoscale Discussion | SPC | 3 hr |
| Jan 9, 1:09 PM CST | Mesoscale Discussion | SPC | 3 hr |
| Jan 10, 2:31 PM CST | Winter Storm Watch | ILX | 12 hr |
| Jan 11, 2:52 AM CST | Winter Storm Warning | ILX | 48 hr |
| Jan 12, 2:27 PM CST | Wind Chill Watch | ILX | 23 hr |
| Jan 13, 2:55 AM CST | Wind Chill Warning | ILX | 3 days |
| Jan 13, 2:55 AM CST | Wind Chill Advisory | ILX | 4 days |
| Jan 18, 2:25 AM CST | Winter Weather Advisory | ILX | 28 hr |
| Jan 18, 2:23 PM CST | Wind Chill Advisory | ILX | 46 hr |
| Jan 20, 2:44 AM CST | Wind Chill Advisory | ILX | 31 hr |
| Jan 21, 3:00 AM CST | Winter Weather Advisory | ILX | 54 hr |
| Jan 23, 2:26 PM CST | Dense Fog Advisory | ILX | 70 hr |
| Jan 26, 1:24 PM CST | Dense Fog Advisory | ILX | 26 hr |
| Jan 28, 1:58 PM CST | Dense Fog Advisory | ILX | 20 hr |
| Feb 6, 4:05 AM CST | Dense Fog Advisory | ILX | 9 hr |
| Feb 6, 9:26 PM CST | Dense Fog Advisory | ILX | 10 hr |
| Feb 8, 2:53 PM CST | Mesoscale Discussion | SPC | 3 hr |
| Feb 22, 1:46 AM CST | Special Weather Statement | ILX | 14 min |
| Feb 22, 1:58 AM CST | Special Weather Statement | ILX | 17 min |
| Feb 25, 1:25 PM CST | Fire Weather Watch | ILX | 13 hr |
| Feb 26, 2:03 AM CST | Red Flag Warning | ILX | 16 hr |
| Feb 27, 2:14 PM CST | Wind Advisory | ILX | 16 hr |
| Feb 27, 2:50 PM CST | Mesoscale Discussion | SPC | 115 min |
| Feb 27, 5:59 PM CST | Mesoscale Discussion | SPC | 91 min |
| Mar 3, 2:29 PM CST | Wind Advisory | ILX | 4 hr |
| Mar 4, 1:25 PM CST | Mesoscale Discussion | SPC | 2 hr |
| Mar 4, 8:15 PM CST | Severe Thunderstorm Warning | ILX | 30 min |
| Mar 4, 8:44 PM CST | Severe Thunderstorm Warning | ILX | 31 min |
| Mar 4, 9:12 PM CST | Severe Thunderstorm Warning | ILX | 19 min |
| Mar 13, 11:43 PM CDT | Severe Thunderstorm Warning | ILX | 6 min |
| Mar 14, 12:02 AM CDT | Severe Thunderstorm Warning | ILX | 28 min |
| Mar 14, 12:07 AM CDT | Special Weather Statement | ILX | 23 min |
| Mar 14, 12:26 AM CDT | Special Weather Statement | ILX | 34 min |
| Mar 14, 12:28 AM CDT | Severe Thunderstorm Warning | ILX | 36 min |
| Mar 14, 2:16 AM CDT | Severe Thunderstorm Warning | ILX | 44 min |
| Mar 14, 3:15 AM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Mar 14, 4:23 AM CDT | Severe Thunderstorm Warning | ILX | 37 min |
| Mar 14, 4:52 AM CDT | Tornado Warning | ILX | 23 min |
| Mar 14, 5:14 AM CDT | Severe Thunderstorm Warning | ILX | 10 min |
| Mar 24, 2:00 PM CDT | Wind Advisory | ILX | 34 hr |
| Mar 29, 8:52 PM CDT | Mesoscale Discussion | SPC | 83 min |
| Apr 2, 10:00 AM CDT | River Flood Warning | ILX | 11 hr |
| Apr 3, 1:56 AM CDT | Wind Advisory | ILX | 17 hr |
| Apr 16, 12:06 PM CDT | Tornado Watch | SPC | 10 hr |
| Apr 16, 1:56 PM CDT | Mesoscale Discussion | SPC | 64 min |
| Apr 16, 7:32 PM CDT | Mesoscale Discussion | SPC | 88 min |
| Apr 19, 8:20 PM CDT | Freeze Warning | ILX | 12 hr |
| Apr 20, 2:25 PM CDT | Freeze Warning | ILX | 18 hr |
| Apr 21, 2:32 AM CDT | Frost Advisory | ILX | 29 hr |
| Apr 27, 2:04 PM CDT | Flood Watch | ILX | 16 hr |
| Apr 27, 7:58 PM CDT | Mesoscale Discussion | SPC | 62 min |
| Apr 27, 9:15 PM CDT | Mesoscale Discussion | SPC | 60 min |
| Apr 27, 9:41 PM CDT | Tornado Watch | SPC | 6 hr |
| Apr 28, 1:39 AM CDT | Flash Flood Warning | ILX | 4 hr |
| Apr 28, 7:34 AM CDT | River Flood Warning | ILX | 4 days |
| May 2, 4:01 PM CDT | Severe Thunderstorm Warning | ILX | 34 min |
| May 2, 4:31 PM CDT | Severe Thunderstorm Warning | ILX | 31 min |
| May 2, 5:45 PM CDT | Severe Thunderstorm Warning | ILX | 45 min |
| May 4, 1:56 PM CDT | Mesoscale Discussion | SPC | 94 min |
| May 7, 12:53 AM CDT | Tornado Watch | SPC | 7 hr |
| May 7, 5:18 AM CDT | Severe Thunderstorm Warning | ILX | 42 min |
| May 7, 5:24 PM CDT | Mesoscale Discussion | SPC | 96 min |
| May 17, 2:42 AM CDT | Dense Fog Advisory | ILX | 6 hr |
| May 21, 5:56 PM CDT | Tornado Watch | SPC | 6 hr |
| May 24, 6:07 AM CDT | Severe Thunderstorm Watch | SPC | 9 hr |
| May 24, 7:48 AM CDT | Severe Thunderstorm Warning | ILX | 57 min |
| May 24, 8:40 AM CDT | Severe Thunderstorm Warning | ILX | 65 min |
| May 24, 2:39 PM CDT | Severe Thunderstorm Watch | SPC | 10 hr |
| May 24, 3:54 PM CDT | Severe Thunderstorm Warning | ILX | 36 min |
| May 27, 5:10 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 27, 6:30 PM CDT | Severe Thunderstorm Warning | ILX | 26 min |
| Jun 13, 2:02 PM CDT | Mesoscale Discussion | SPC | 118 min |
| Jun 13, 2:59 PM CDT | Severe Thunderstorm Watch | SPC | 10 hr |
| Jun 13, 6:16 PM CDT | Severe Thunderstorm Warning | ILX | 44 min |
| Jun 13, 6:57 PM CDT | Severe Thunderstorm Warning | ILX | 48 min |
| Jun 13, 7:48 PM CDT | Mesoscale Discussion | SPC | 87 min |
| Jun 16, 12:33 PM CDT | Mesoscale Discussion | SPC | 117 min |
| Jun 16, 2:15 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jun 19, 3:58 PM CDT | Mesoscale Discussion | SPC | 92 min |
| Jun 22, 6:55 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 22, 7:36 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jun 22, 10:43 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 25, 8:01 AM CDT | Mesoscale Discussion | SPC | 119 min |
| Jun 25, 8:43 AM CDT | Severe Thunderstorm Warning | ILX | 32 min |
| Jun 25, 9:10 AM CDT | Special Weather Statement | ILX | 35 min |
| Jun 25, 5:17 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 25, 7:53 PM CDT | Severe Thunderstorm Warning | ILX | 37 min |
| Jun 25, 8:20 PM CDT | Severe Thunderstorm Warning | ILX | 55 min |
| Jun 25, 8:43 PM CDT | Severe Thunderstorm Warning | ILX | 32 min |
| Jul 2, 7:30 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jul 2, 8:03 PM CDT | Severe Thunderstorm Warning | ILX | 42 min |
| Jul 10, 6:44 PM CDT | Special Weather Statement | ILX | 31 min |
| Jul 13, 2:51 PM CDT | Heat Advisory | ILX | 53 hr |
| Jul 14, 3:15 PM CDT | Mesoscale Discussion | SPC | 90 min |
| Jul 14, 5:55 PM CDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jul 14, 10:05 PM CDT | Special Weather Statement | ILX | 25 min |
| Jul 14, 10:52 PM CDT | Mesoscale Discussion | SPC | 83 min |
| Jul 14, 11:10 PM CDT | Severe Thunderstorm Warning | ILX | 50 min |
| Jul 15, 12:03 AM CDT | Severe Thunderstorm Warning | ILX | 42 min |
| Jul 15, 12:20 AM CDT | Severe Thunderstorm Warning | ILX | 25 min |
| Jul 15, 12:54 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 15, 1:59 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 15, 2:47 PM CDT | Flood Watch | ILX | 16 hr |
| Jul 15, 3:18 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 15, 5:26 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 15, 6:53 PM CDT | Tornado Watch | SPC | 6 hr |
| Jul 15, 6:55 PM CDT | Mesoscale Discussion | SPC | 95 min |
| Jul 15, 7:37 PM CDT | Severe Thunderstorm Warning | ILX | 38 min |
| Jul 15, 7:55 PM CDT | Tornado Warning | ILX | 35 min |
| Jul 15, 8:07 PM CDT | Severe Thunderstorm Warning | ILX | 38 min |
| Jul 15, 8:27 PM CDT | Severe Thunderstorm Warning | ILX | 63 min |
| Jul 15, 10:33 PM CDT | Flash Flood Warning | ILX | 3 hr |
| Jul 24, 4:09 PM CDT | Special Weather Statement | ILX | 21 min |
| Jul 29, 1:29 AM CDT | Flood Watch | ILX | 6 hr |
| Jul 30, 5:43 AM CDT | Mesoscale Discussion | SPC | 92 min |
| Jul 31, 5:50 AM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 1, 12:43 AM CDT | Special Weather Statement | ILX | 32 min |
| Aug 1, 12:51 AM CDT | Special Weather Statement | ILX | 24 min |
| Aug 15, 8:51 PM CDT | Mesoscale Discussion | SPC | 84 min |
| Aug 15, 9:08 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 15, 10:19 PM CDT | Special Weather Statement | ILX | 26 min |
| Aug 15, 10:40 PM CDT | Severe Thunderstorm Warning | ILX | 37 min |
| Aug 15, 10:59 PM CDT | Severe Thunderstorm Warning | ILX | 46 min |
| Aug 16, 12:04 AM CDT | Special Weather Statement | ILX | 26 min |
| Aug 25, 2:27 AM CDT | Excessive Heat Watch | ILX | 35 hr |
| Aug 25, 2:27 AM CDT | Excessive Heat Warning | ILX | 42 hr |
| Aug 26, 1:55 PM CDT | Excessive Heat Warning | ILX | 30 hr |
| Aug 27, 4:47 PM CDT | Mesoscale Discussion | SPC | 88 min |
| Aug 27, 6:58 PM CDT | Severe Thunderstorm Warning | ILX | 32 min |
| Aug 27, 7:40 PM CDT | Severe Thunderstorm Warning | ILX | 35 min |
| Aug 27, 8:26 PM CDT | Severe Thunderstorm Warning | ILX | 39 min |
| Aug 27, 9:39 PM CDT | Mesoscale Discussion | SPC | 96 min |
| Oct 14, 1:55 PM CDT | Freeze Warning | ILX | 42 hr |
| Oct 29, 2:39 AM CDT | Red Flag Warning | ILX | 16 hr |
| Oct 30, 11:24 PM CDT | Special Weather Statement | ILX | 36 min |
| Nov 18, 3:32 AM CST | Wind Advisory | ILX | 26 hr |
| Nov 21, 3:02 AM CST | Wind Advisory | ILX | 18 hr |
| Dec 4, 2:18 AM CST | Wind Advisory | ILX | 23 hr |
| Dec 13, 2:02 AM CST | Winter Weather Advisory | ILX | 37 hr |
| Dec 14, 4:58 AM CST | Mesoscale Discussion | SPC | 6 hr |
| Dec 15, 12:09 AM CST | Dense Fog Advisory | ILX | 11 hr |
| Dec 15, 8:33 PM CST | Dense Fog Advisory | ILX | 14 hr |
| Dec 26, 5:30 AM CST | Dense Fog Advisory | ILX | 7 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 archive20232025
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.