Alert archive / Illinois / Shelby County
Weather alerts in Shelby County, Illinois, 2020
98 weather alerts in 2020, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Shelby County and its neighbors
Each county as a circle sized by its count in 2020. Tap one for its archive.
- Alerts
- 98
- Warnings
- 31
- Watches
- 14
- Advisories
- 28
- Busiest month
- April18 alerts
- Busiest day
- May 3, 20206 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Shelby County, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 19 | 5 | 74% | 1 | 100% | 9 min |
| Flash flood warnings | 1 | 1 | 0% | 3 | 33% | 10 min |
Each office's whole area, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Lincoln, IL: tornado warnings | 21 | 6 | 71% | 20 | 65% | 5 min |
| NWS Lincoln, IL: severe thunderstorm warnings | 137 | 64 | 53% | 368 | 73% | 23 min |
| NWS Lincoln, IL: flash flood warnings | 35 | 17 | 51% | 40 | 65% | 75 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 3, 1:12 AM CST | Dense Fog Advisory | ILX | 8 hr |
| Jan 8, 2:58 PM CST | Flood Watch | ILX | 69 hr |
| Jan 11, 3:15 AM CST | Areal Flood Warning | ILX | 9 hr |
| Jan 11, 12:15 PM CST | Areal Flood Warning | ILX | 3 hr |
| Jan 11, 3:14 PM CST | Areal Flood Warning | ILX | 6 hr |
| Jan 14, 7:53 PM CST | Dense Fog Advisory | ILX | 13 hr |
| Jan 16, 3:10 PM CST | Winter Weather Advisory | ILX | 39 hr |
| Jan 16, 3:21 PM CST | Flood Watch | ILX | 43 hr |
| Jan 17, 9:45 AM CST | Mesoscale Discussion | SPC | 6 hr |
| Jan 17, 4:07 PM CST | Mesoscale Discussion | SPC | 5 hr |
| Jan 24, 6:21 AM CST | Dense Fog Advisory | ILX | 9 hr |
| Feb 4, 3:28 PM CST | Winter Weather Advisory | ILX | 45 hr |
| Feb 11, 2:40 PM CST | Winter Weather Advisory | ILX | 43 hr |
| Feb 25, 3:06 AM CST | Winter Weather Advisory | ILX | 35 hr |
| Mar 5, 5:59 PM CST | Wind Advisory | ILX | 15 hr |
| Mar 12, 6:39 AM CDT | Dense Fog Advisory | ILX | 5 hr |
| Mar 25, 1:51 AM CDT | Dense Fog Advisory | ILX | 9 hr |
| Mar 25, 11:02 AM CDT | Dense Fog Advisory | ILX | 58 min |
| Mar 27, 10:16 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Mar 28, 1:17 PM CDT | Mesoscale Discussion | SPC | 88 min |
| Mar 28, 2:45 PM CDT | Tornado Watch | SPC | 6 hr |
| Mar 28, 3:21 PM CDT | Wind Advisory | ILX | 28 hr |
| Apr 8, 1:46 PM CDT | Mesoscale Discussion | SPC | 119 min |
| Apr 8, 3:08 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Apr 8, 5:56 PM CDT | Severe Thunderstorm Warning | ILX | 49 min |
| Apr 8, 6:33 PM CDT | Severe Thunderstorm Warning | ILX | 42 min |
| Apr 9, 3:28 AM CDT | Wind Advisory | ILX | 16 hr |
| Apr 9, 2:33 PM CDT | Freeze Warning | ILX | 18 hr |
| Apr 11, 8:06 PM CDT | Severe Thunderstorm Warning | ILX | 39 min |
| Apr 12, 3:39 AM CDT | Wind Advisory | ILX | 35 hr |
| Apr 13, 3:03 PM CDT | Freeze Warning | ILX | 18 hr |
| Apr 17, 12:41 PM CDT | Freeze Warning | ILX | 20 hr |
| Apr 24, 2:13 AM CDT | Dense Fog Advisory | ILX | 7 hr |
| Apr 28, 3:33 PM CDT | Mesoscale Discussion | SPC | 87 min |
| Apr 28, 3:51 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Apr 28, 6:32 PM CDT | Mesoscale Discussion | SPC | 118 min |
| Apr 28, 7:07 PM CDT | Severe Thunderstorm Warning | ILX | 53 min |
| Apr 28, 7:38 PM CDT | Severe Thunderstorm Warning | ILX | 52 min |
| Apr 28, 8:00 PM CDT | Severe Thunderstorm Warning | ILX | 45 min |
| Apr 28, 9:06 PM CDT | Mesoscale Discussion | SPC | 84 min |
| May 2, 8:27 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 2, 9:38 PM CDT | Severe Thunderstorm Warning | ILX | 37 min |
| May 2, 10:07 PM CDT | Severe Thunderstorm Warning | ILX | 38 min |
| May 2, 10:43 PM CDT | Severe Thunderstorm Warning | ILX | 47 min |
| May 2, 11:10 PM CDT | Mesoscale Discussion | SPC | 95 min |
| May 2, 11:12 PM CDT | Severe Thunderstorm Warning | ILX | 31 min |
| May 7, 3:12 AM CDT | Freeze Watch | ILX | 24 hr |
| May 8, 3:01 AM CDT | Freeze Warning | ILX | 29 hr |
| May 16, 3:38 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| May 16, 9:06 PM CDT | Flash Flood Watch | ILX | 34 hr |
| May 17, 1:44 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 17, 4:18 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| May 24, 4:07 PM CDT | Special Weather Statement | ILX | 38 min |
| Jun 3, 1:45 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 9, 2:20 AM CDT | Wind Advisory | ILX | 18 hr |
| Jun 22, 1:36 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 22, 6:50 PM CDT | Flash Flood Warning | ILX | 3 hr |
| Jun 29, 3:21 AM CDT | Flash Flood Watch | ILX | 58 hr |
| Jul 2, 1:54 PM CDT | Special Weather Statement | ILX | 4 hr |
| Jul 11, 10:11 PM CDT | Severe Thunderstorm Warning | ILX | 49 min |
| Jul 15, 2:10 PM CDT | Tornado Watch | SPC | 7 hr |
| Jul 15, 5:35 PM CDT | Mesoscale Discussion | SPC | 85 min |
| Jul 15, 5:40 PM CDT | Severe Thunderstorm Warning | ILX | 50 min |
| Jul 15, 5:53 PM CDT | Severe Thunderstorm Warning | ILX | 37 min |
| Jul 15, 6:17 PM CDT | Severe Thunderstorm Warning | ILX | 43 min |
| Jul 15, 6:31 PM CDT | Severe Thunderstorm Warning | ILX | 44 min |
| Jul 17, 3:39 AM CDT | Heat Advisory | ILX | 40 hr |
| Jul 18, 7:55 PM CDT | Heat Advisory | ILX | 23 hr |
| Jul 21, 11:19 AM CDT | Mesoscale Discussion | SPC | 86 min |
| Jul 21, 1:43 PM CDT | Mesoscale Discussion | SPC | 92 min |
| Jul 21, 4:39 PM CDT | Severe Thunderstorm Warning | ILX | 44 min |
| Jul 21, 5:04 PM CDT | Mesoscale Discussion | SPC | 56 min |
| Jul 21, 5:14 PM CDT | Severe Thunderstorm Warning | ILX | 46 min |
| Jul 27, 12:14 PM CDT | Mesoscale Discussion | SPC | 91 min |
| Jul 30, 2:40 PM CDT | Areal Flood Warning | ILX | 6 hr |
| Aug 10, 2:38 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 10, 2:58 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 10, 4:29 PM CDT | Severe Thunderstorm Warning | ILX | 46 min |
| Aug 10, 5:16 PM CDT | Severe Thunderstorm Warning | ILX | 44 min |
| Aug 10, 5:17 PM CDT | Mesoscale Discussion | SPC | 118 min |
| Aug 15, 4:40 PM CDT | Mesoscale Discussion | SPC | 95 min |
| Sep 1, 4:35 AM CDT | Dense Fog Advisory | ILX | 4 hr |
| Sep 3, 2:58 AM CDT | Dense Fog Advisory | ILX | 6 hr |
| Sep 8, 3:01 PM CDT | Mesoscale Discussion | SPC | 119 min |
| Sep 9, 6:41 AM CDT | Dense Fog Advisory | ILX | 4 hr |
| Oct 4, 2:19 AM CDT | Frost Advisory | ILX | 30 hr |
| Oct 11, 6:33 AM CDT | Dense Fog Advisory | ILX | 3 hr |
| Oct 14, 4:19 AM CDT | Red Flag Warning | ILX | 15 hr |
| Oct 15, 3:15 AM CDT | Freeze Warning | ILX | 30 hr |
| Oct 16, 3:52 AM CDT | Fire Weather Watch | ILX | 11 hr |
| Oct 16, 2:29 PM CDT | Red Flag Warning | ILX | 30 hr |
| Oct 16, 3:03 PM CDT | Wind Advisory | ILX | 28 hr |
| Oct 22, 12:58 AM CDT | Dense Fog Advisory | ILX | 6 hr |
| Nov 10, 5:01 PM CST | Mesoscale Discussion | SPC | 119 min |
| Nov 10, 5:58 PM CST | Special Weather Statement | ILX | 32 min |
| Nov 14, 3:20 AM CST | Wind Advisory | ILX | 38 hr |
| Nov 18, 2:43 PM CST | Wind Advisory | ILX | 27 hr |
| Dec 23, 3:05 AM CST | Wind Advisory | ILX | 24 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 | 19 |
| Severe Thunderstorm Watch | 6 |
| Tornado Watch | 2 |
| Mesoscale Discussion | 22 |
| Special Weather Statement | 3 |
| Flooding | |
| Areal Flood Warning | 4 |
| Flash Flood Warning | 1 |
| Flash Flood Watch | 2 |
| Flood Watch | 2 |
| Winter | |
| Winter Weather Advisory | 4 |
| Heat | |
| Heat Advisory | 2 |
| Cold | |
| Freeze Warning | 5 |
| Freeze Watch | 1 |
| Frost Advisory | 1 |
| Wind and dust | |
| Wind Advisory | 9 |
| Fire | |
| Red Flag Warning | 2 |
| Fire Weather Watch | 1 |
| Fog and smoke | |
| Dense Fog Advisory | 12 |
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.