Alert archive / Illinois / Shelby County
Weather alerts in Shelby County, Illinois, 2017
96 weather alerts in 2017, 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 2017. Tap one for its archive.
- Alerts
- 96
- Warnings
- 21
- Watches
- 17
- Advisories
- 22
- Busiest month
- April19 alerts
- Busiest day
- April 29, 20177 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
0 of 1 tornado warnings covering Shelby County in 2017 had a tornado report inside them.
Shelby County, 2017
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 1 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 12 | 8 | 33% | 7 | 86% | 16 min |
| Flash flood warnings | 2 | 1 | 50% | 0 |
Each office's whole area, 2017
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Lincoln, IL: tornado warnings | 23 | 3 | 87% | 21 | 29% | 11 min |
| NWS Lincoln, IL: severe thunderstorm warnings | 168 | 92 | 45% | 378 | 75% | 19 min |
| NWS Lincoln, IL: flash flood warnings | 31 | 10 | 68% | 26 | 81% | 142 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 2, 4:59 PM CST | Dense Fog Advisory | ILX | 15 hr |
| Jan 4, 2:58 PM CST | Winter Weather Advisory | ILX | 24 hr |
| Jan 10, 3:43 AM CST | Wind Advisory | ILX | 17 hr |
| Jan 11, 11:53 AM CST | Dense Fog Advisory | ILX | 9 hr |
| Jan 12, 4:13 AM CST | Winter Storm Watch | ILX | 59 hr |
| Jan 13, 4:17 AM CST | Freezing Rain Advisory | ILX | 56 hr |
| Jan 14, 2:14 AM CST | Mesoscale Discussion | SPC | 6 hr |
| Jan 15, 10:45 PM CST | Dense Fog Advisory | ILX | 13 hr |
| Jan 16, 12:04 PM CST | Dense Fog Advisory | ILX | 17 hr |
| Jan 19, 3:08 PM CST | Dense Fog Advisory | ILX | 19 hr |
| Feb 6, 11:20 PM CST | Mesoscale Discussion | SPC | 115 min |
| Feb 19, 1:00 AM CST | Dense Fog Advisory | ILX | 10 hr |
| Feb 19, 10:08 PM CST | Dense Fog Advisory | ILX | 11 hr |
| Feb 21, 10:51 PM CST | Dense Fog Advisory | ILX | 12 hr |
| Feb 23, 4:25 AM CST | Dense Fog Advisory | ILX | 6 hr |
| Feb 28, 2:57 PM CST | Tornado Watch | SPC | 7 hr |
| Feb 28, 6:27 PM CST | Severe Thunderstorm Warning | ILX | 28 min |
| Feb 28, 9:51 PM CST | Tornado Watch | SPC | 6 hr |
| Mar 6, 10:35 PM CST | Severe Thunderstorm Watch | SPC | 4 hr |
| Mar 6, 11:13 PM CST | Mesoscale Discussion | SPC | 2 hr |
| Mar 7, 1:16 AM CST | Severe Thunderstorm Warning | ILX | 44 min |
| Mar 7, 1:53 AM CST | Mesoscale Discussion | SPC | 97 min |
| Mar 7, 1:57 AM CST | Severe Thunderstorm Warning | ILX | 48 min |
| Mar 17, 6:53 AM CDT | Severe Thunderstorm Warning | ILX | 37 min |
| Mar 30, 11:56 AM CDT | Mesoscale Discussion | SPC | 64 min |
| Mar 30, 12:31 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Mar 30, 1:54 PM CDT | Special Weather Statement | ILX | 51 min |
| Mar 30, 2:42 PM CDT | Special Weather Statement | ILX | 48 min |
| Apr 10, 1:48 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Apr 10, 1:51 PM CDT | Special Weather Statement | ILX | 24 min |
| Apr 10, 3:25 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 10, 6:22 PM CDT | Mesoscale Discussion | SPC | 53 min |
| Apr 10, 6:54 PM CDT | Special Weather Statement | ILX | 21 min |
| Apr 10, 7:16 PM CDT | Severe Thunderstorm Warning | ILX | 29 min |
| Apr 10, 8:58 PM CDT | Mesoscale Discussion | SPC | 62 min |
| Apr 27, 2:41 PM CDT | Flash Flood Watch | ILX | 5 days |
| Apr 28, 1:10 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 29, 3:57 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Apr 29, 4:46 PM CDT | Severe Thunderstorm Warning | ILX | 44 min |
| Apr 29, 5:26 PM CDT | Severe Thunderstorm Warning | ILX | 49 min |
| Apr 29, 5:50 PM CDT | Tornado Warning | ILX | 25 min |
| Apr 29, 6:14 PM CDT | Severe Thunderstorm Warning | ILX | 46 min |
| Apr 29, 6:22 PM CDT | Flash Flood Warning | ILX | 6 hr |
| Apr 29, 6:30 PM CDT | Mesoscale Discussion | SPC | 60 min |
| Apr 30, 12:48 AM CDT | Areal Flood Warning | ILX | 9 hr |
| Apr 30, 6:07 AM CDT | Areal Flood Warning | ILX | 6 hr |
| Apr 30, 12:02 PM CDT | Areal Flood Warning | ILX | 4 days |
| May 2, 2:55 PM CDT | Flash Flood Watch | ILX | 61 hr |
| May 4, 7:43 AM CDT | Flash Flood Warning | ILX | 8 hr |
| May 4, 3:45 PM CDT | Areal Flood Warning | ILX | 24 hr |
| May 10, 6:26 PM CDT | Mesoscale Discussion | SPC | 94 min |
| May 10, 7:07 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| May 17, 4:18 AM CDT | Wind Advisory | ILX | 21 hr |
| Jun 5, 6:14 AM CDT | Dense Fog Advisory | ILX | 96 min |
| Jun 14, 12:40 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 14, 1:04 PM CDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jun 14, 2:44 PM CDT | Severe Thunderstorm Warning | ILX | 32 min |
| Jun 14, 6:11 PM CDT | Mesoscale Discussion | SPC | 64 min |
| Jun 17, 8:17 PM CDT | Mesoscale Discussion | SPC | 58 min |
| Jun 17, 9:50 PM CDT | Mesoscale Discussion | SPC | 55 min |
| Jun 17, 10:53 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 18, 1:40 AM CDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 20, 2:05 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 10, 8:56 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 10, 10:41 PM CDT | Severe Thunderstorm Warning | ILX | 31 min |
| Jul 16, 2:06 PM CDT | Mesoscale Discussion | SPC | 54 min |
| Jul 16, 7:04 PM CDT | Special Weather Statement | ILX | 41 min |
| Jul 17, 3:11 PM CDT | Excessive Heat Watch | ILX | 24 hr |
| Jul 18, 3:07 PM CDT | Excessive Heat Warning | ILX | 4 days |
| Jul 22, 7:11 PM CDT | Mesoscale Discussion | SPC | 94 min |
| Jul 23, 3:12 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 23, 3:32 AM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Aug 1, 1:43 PM CDT | Special Weather Statement | ILX | 2 hr |
| Aug 2, 4:13 PM CDT | Special Weather Statement | ILX | 2 hr |
| Aug 21, 3:29 PM CDT | Mesoscale Discussion | SPC | 91 min |
| Sep 4, 3:43 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 4, 4:00 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Sep 4, 5:22 PM CDT | Severe Thunderstorm Warning | ILX | 38 min |
| Sep 4, 6:05 PM CDT | Mesoscale Discussion | SPC | 115 min |
| Sep 4, 9:26 PM CDT | Mesoscale Discussion | SPC | 64 min |
| Sep 14, 1:09 AM CDT | Dense Fog Advisory | ILX | 9 hr |
| Oct 8, 5:20 AM CDT | Dense Fog Advisory | ILX | 4 hr |
| Oct 9, 7:47 AM CDT | Dense Fog Advisory | ILX | 3 hr |
| Oct 25, 3:16 AM CDT | Frost Advisory | ILX | 29 hr |
| Oct 27, 3:24 AM CDT | Freeze Watch | ILX | 12 hr |
| Oct 27, 2:56 PM CDT | Freeze Warning | ILX | 42 hr |
| Nov 5, 6:04 AM CST | Mesoscale Discussion | SPC | 2 hr |
| Nov 5, 11:09 AM CST | Mesoscale Discussion | SPC | 66 min |
| Nov 5, 12:35 PM CST | Tornado Watch | SPC | 6 hr |
| Nov 5, 2:49 PM CST | Severe Thunderstorm Warning | ILX | 41 min |
| Nov 5, 2:51 PM CST | Mesoscale Discussion | SPC | 114 min |
| Nov 17, 3:11 PM CST | Wind Advisory | ILX | 27 hr |
| Nov 18, 10:10 AM CST | Special Weather Statement | ILX | 65 min |
| Dec 13, 10:58 AM CST | Wind Advisory | ILX | 10 hr |
| Dec 23, 3:39 AM CST | Winter Weather Advisory | ILX | 38 hr |
| Dec 29, 3:00 PM CST | Wind Chill Advisory | ILX | 4 days |
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 | 12 |
| Tornado Warning | 1 |
| Severe Thunderstorm Watch | 9 |
| Tornado Watch | 3 |
| Mesoscale Discussion | 28 |
| Special Weather Statement | 8 |
| Flooding | |
| Areal Flood Warning | 4 |
| Flash Flood Warning | 2 |
| Flash Flood Watch | 2 |
| Winter | |
| Winter Storm Watch | 1 |
| Freezing Rain Advisory | 1 |
| Winter Weather Advisory | 2 |
| Heat | |
| Excessive Heat Warning | 1 |
| Excessive Heat Watch | 1 |
| Cold | |
| Freeze Warning | 1 |
| Freeze Watch | 1 |
| Frost Advisory | 1 |
| Wind Chill Advisory | 1 |
| Wind and dust | |
| Wind Advisory | 4 |
| Fog and smoke | |
| Dense Fog Advisory | 13 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20162018
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.