Alert archive / Illinois / DeWitt County
Weather alerts in DeWitt County, Illinois, 2016
85 weather alerts in 2016, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
DeWitt County and its neighbors
Each county as a circle sized by its count in 2016. Tap one for its archive.
- Alerts
- 85
- Warnings
- 19
- Watches
- 9
- Advisories
- 22
- Busiest month
- July22 alerts
- Busiest day
- July 13, 20167 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
DeWitt County, 2016
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 12 | 9 | 25% | 8 | 75% | 19 min |
| Flash flood warnings | 1 | 0 | 100% | 0 |
Each office's whole area, 2016
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Lincoln, IL: tornado warnings | 26 | 9 | 65% | 13 | 85% | 16 min |
| NWS Lincoln, IL: severe thunderstorm warnings | 142 | 70 | 51% | 252 | 68% | 19 min |
| NWS Lincoln, IL: flash flood warnings | 34 | 6 | 82% | 15 | 67% | 89 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 8, 8:41 AM CST | Dense Fog Advisory | ILX | 3 hr |
| Jan 9, 3:08 AM CST | Winter Weather Advisory | ILX | 16 hr |
| Jan 12, 5:43 AM CST | Winter Weather Advisory | ILX | 3 hr |
| Jan 17, 3:30 AM CST | Wind Chill Advisory | ILX | 32 hr |
| Jan 19, 8:21 PM CST | Mesoscale Discussion | SPC | 3 hr |
| Feb 2, 7:09 PM CST | Dense Fog Advisory | ILX | 8 hr |
| Feb 13, 3:32 AM CST | Winter Weather Advisory | ILX | 38 hr |
| Feb 15, 7:25 AM CST | Dense Fog Advisory | ILX | 4 hr |
| Feb 18, 3:03 PM CST | Wind Advisory | ILX | 27 hr |
| Feb 23, 3:28 PM CST | Winter Storm Warning | ILX | 30 hr |
| Feb 24, 6:34 AM CST | Mesoscale Discussion | SPC | 5 hr |
| Feb 28, 3:46 AM CST | Wind Advisory | ILX | 14 hr |
| Mar 14, 3:12 AM CDT | Dense Fog Advisory | ILX | 6 hr |
| Mar 15, 1:29 AM CDT | Dense Fog Advisory | ILX | 8 hr |
| Mar 15, 2:24 PM CDT | Mesoscale Discussion | SPC | 66 min |
| Mar 15, 3:31 PM CDT | Tornado Watch | SPC | 7 hr |
| Mar 15, 3:50 PM CDT | Wind Advisory | ILX | 28 hr |
| Mar 15, 8:37 PM CDT | Severe Thunderstorm Warning | ILX | 23 min |
| Mar 31, 12:36 PM CDT | Mesoscale Discussion | SPC | 84 min |
| Apr 1, 3:36 PM CDT | Wind Advisory | ILX | 27 hr |
| Apr 2, 3:26 AM CDT | Freeze Warning | ILX | 29 hr |
| Apr 2, 9:01 PM CDT | Wind Advisory | ILX | 22 hr |
| Apr 3, 3:09 PM CDT | Freeze Watch | ILX | 13 hr |
| Apr 4, 3:41 AM CDT | Freeze Warning | ILX | 28 hr |
| Apr 7, 3:40 AM CDT | Freeze Watch | ILX | 23 hr |
| Apr 8, 2:56 AM CDT | Freeze Warning | ILX | 30 hr |
| Apr 11, 10:26 AM CDT | Freeze Warning | ILX | 22 hr |
| Apr 21, 1:29 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Apr 28, 1:32 AM CDT | Special Weather Statement | ILX | 28 min |
| May 1, 5:06 PM CDT | Mesoscale Discussion | SPC | 114 min |
| May 11, 1:53 AM CDT | Dense Fog Advisory | ILX | 7 hr |
| May 11, 12:10 PM CDT | Severe Thunderstorm Watch | SPC | 12 hr |
| May 11, 2:48 PM CDT | Severe Thunderstorm Warning | ILX | 42 min |
| May 14, 2:44 PM CDT | Frost Advisory | ILX | 16 hr |
| May 26, 6:44 AM CDT | Special Weather Statement | ILX | 46 min |
| May 26, 7:30 AM CDT | Severe Thunderstorm Warning | ILX | 45 min |
| Jun 9, 7:58 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 14, 7:18 PM CDT | Mesoscale Discussion | SPC | 117 min |
| Jun 20, 1:54 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 20, 3:03 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 20, 6:05 PM CDT | Mesoscale Discussion | SPC | 85 min |
| Jun 20, 9:04 PM CDT | Severe Thunderstorm Warning | ILX | 41 min |
| Jun 20, 9:36 PM CDT | Severe Thunderstorm Warning | ILX | 54 min |
| Jun 20, 9:44 PM CDT | Severe Thunderstorm Warning | ILX | 31 min |
| Jun 22, 4:00 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 22, 4:25 AM CDT | Severe Thunderstorm Watch | SPC | 3 hr |
| Jun 22, 5:38 AM CDT | Severe Thunderstorm Warning | ILX | 37 min |
| Jun 22, 3:38 PM CDT | Mesoscale Discussion | SPC | 97 min |
| Jun 26, 1:05 PM CDT | Mesoscale Discussion | SPC | 85 min |
| Jul 6, 1:27 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 6, 1:55 AM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 6, 5:04 AM CDT | Mesoscale Discussion | SPC | 116 min |
| Jul 6, 5:18 AM CDT | Special Weather Statement | ILX | 42 min |
| Jul 6, 5:39 AM CDT | Special Weather Statement | ILX | 66 min |
| Jul 13, 9:19 AM CDT | Special Weather Statement | ILX | 26 min |
| Jul 13, 9:43 AM CDT | Special Weather Statement | ILX | 47 min |
| Jul 13, 2:10 PM CDT | Mesoscale Discussion | SPC | 65 min |
| Jul 13, 2:37 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 13, 4:31 PM CDT | Severe Thunderstorm Warning | ILX | 44 min |
| Jul 13, 5:07 PM CDT | Severe Thunderstorm Warning | ILX | 38 min |
| Jul 13, 5:08 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 17, 8:06 PM CDT | Mesoscale Discussion | SPC | 84 min |
| Jul 18, 9:04 AM CDT | Special Weather Statement | ILX | 56 min |
| Jul 18, 3:41 PM CDT | Excessive Heat Watch | ILX | 48 hr |
| Jul 20, 3:11 PM CDT | Excessive Heat Warning | ILX | 4 days |
| Jul 21, 11:08 PM CDT | Mesoscale Discussion | SPC | 67 min |
| Jul 24, 10:09 PM CDT | Special Weather Statement | ILX | 51 min |
| Jul 28, 6:57 AM CDT | Flash Flood Warning | ILX | 3 hr |
| Jul 28, 12:12 PM CDT | Special Weather Statement | ILX | 3 hr |
| Jul 28, 3:03 PM CDT | Special Weather Statement | ILX | 3 hr |
| Jul 28, 3:37 PM CDT | Special Weather Statement | ILX | 38 min |
| Aug 14, 3:22 PM CDT | Special Weather Statement | ILX | 3 hr |
| Aug 24, 1:20 PM CDT | Mesoscale Discussion | SPC | 85 min |
| Aug 25, 1:54 AM CDT | Severe Thunderstorm Warning | ILX | 36 min |
| Aug 25, 2:02 AM CDT | Severe Thunderstorm Warning | ILX | 43 min |
| Aug 25, 3:16 PM CDT | Mesoscale Discussion | SPC | 119 min |
| Sep 9, 2:15 AM CDT | Dense Fog Advisory | ILX | 7 hr |
| Sep 21, 3:25 PM CDT | Special Weather Statement | ILX | 80 min |
| Nov 2, 3:32 PM CDT | Mesoscale Discussion | SPC | 118 min |
| Nov 2, 5:14 PM CDT | Severe Thunderstorm Warning | ILX | 46 min |
| Nov 18, 10:42 AM CST | Wind Advisory | ILX | 25 hr |
| Nov 27, 9:09 AM CST | Dense Fog Advisory | ILX | 3 hr |
| Dec 15, 3:01 PM CST | Winter Weather Advisory | ILX | 63 hr |
| Dec 17, 3:45 AM CST | Wind Chill Advisory | ILX | 54 hr |
| Dec 24, 6:26 AM CST | Dense Fog Advisory | ILX | 4 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 | 12 |
| Severe Thunderstorm Watch | 5 |
| Tornado Watch | 1 |
| Mesoscale Discussion | 22 |
| Special Weather Statement | 13 |
| Flooding | |
| Flash Flood Warning | 1 |
| Winter | |
| Winter Storm Warning | 1 |
| Winter Weather Advisory | 4 |
| Heat | |
| Excessive Heat Warning | 1 |
| Excessive Heat Watch | 1 |
| Cold | |
| Freeze Warning | 4 |
| Freeze Watch | 2 |
| Frost Advisory | 1 |
| Wind Chill Advisory | 2 |
| Wind and dust | |
| Wind Advisory | 6 |
| Fog and smoke | |
| Dense Fog Advisory | 9 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20152017
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.