Alert archive / Illinois / Shelby County
Weather alerts in Shelby County, Illinois, 2009
129 weather alerts in 2009, 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 2009. Tap one for its archive.
- Alerts
- 129
- Warnings
- 33
- Watches
- 22
- Advisories
- 33
- Busiest month
- May34 alerts
- Busiest day
- May 14, 200911 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 4 tornado warnings covering Shelby County in 2009 had a tornado report inside them; 3 of 4 tornado reports fell inside a warning, on average 5 minutes after it went out.
Shelby County, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 4 | 1 | 75% | 4 | 75% | 5 min |
| Severe thunderstorm warnings | 24 | 16 | 33% | 8 | 88% | 26 min |
| Flash flood warnings | 2 | 0 | 100% | 1 | 0% |
Each office's whole area, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Lincoln, IL: tornado warnings | 44 | 10 | 77% | 26 | 65% | 15 min |
| NWS Lincoln, IL: severe thunderstorm warnings | 176 | 98 | 44% | 351 | 74% | 24 min |
| NWS Lincoln, IL: flash flood warnings | 37 | 13 | 65% | 51 | 55% | 100 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, 8:40 PM CST | Dense Fog Advisory | ILX | 9 hr |
| Jan 5, 3:12 PM CST | Winter Weather Advisory | ILX | 20 hr |
| Jan 13, 2:53 PM CST | Wind Chill Advisory | ILX | 68 hr |
| Jan 13, 2:53 PM CST | Winter Weather Advisory | ILX | 27 hr |
| Jan 26, 3:35 AM CST | Winter Weather Advisory | ILX | 54 hr |
| Jan 27, 6:25 PM CST | Mesoscale Discussion | SPC | 6 hr |
| Feb 10, 10:33 AM CST | Flood Watch | ILX | 29 hr |
| Feb 10, 12:36 PM CST | Wind Advisory | ILX | 32 hr |
| Feb 11, 6:15 AM CST | Areal Flood Advisory | ILX | 14 hr |
| Feb 26, 3:28 AM CST | Dense Fog Advisory | ILX | 7 hr |
| Feb 26, 7:42 PM CST | Mesoscale Discussion | SPC | 93 min |
| Mar 5, 10:32 AM CST | Wind Advisory | ILX | 7 hr |
| Mar 8, 9:26 AM CDT | Mesoscale Discussion | SPC | 64 min |
| Mar 8, 9:31 AM CDT | Wind Advisory | ILX | 11 hr |
| Mar 8, 10:39 AM CDT | Tornado Watch | SPC | 7 hr |
| Mar 8, 11:35 AM CDT | Mesoscale Discussion | SPC | 115 min |
| Mar 10, 3:15 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Mar 10, 3:52 PM CDT | Wind Advisory | ILX | 14 hr |
| Mar 10, 7:31 PM CDT | Mesoscale Discussion | SPC | 119 min |
| Mar 18, 2:22 PM CDT | Mesoscale Discussion | SPC | 113 min |
| Mar 23, 3:30 PM CDT | Wind Advisory | ILX | 24 hr |
| Mar 24, 3:19 PM CDT | High Wind Warning | ILX | 5 hr |
| Apr 5, 10:50 AM CDT | Mesoscale Discussion | SPC | 115 min |
| Apr 26, 1:29 PM CDT | Wind Advisory | ILX | 6 hr |
| Apr 27, 1:57 AM CDT | Wind Advisory | ILX | 12 hr |
| May 7, 1:13 AM CDT | Dense Fog Advisory | ILX | 8 hr |
| May 7, 5:56 PM CDT | Mesoscale Discussion | SPC | 64 min |
| May 7, 6:13 PM CDT | Severe Thunderstorm Warning | ILX | 47 min |
| May 7, 6:14 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| May 7, 6:57 PM CDT | Severe Thunderstorm Warning | ILX | 48 min |
| May 7, 7:53 PM CDT | Severe Thunderstorm Warning | ILX | 52 min |
| May 13, 8:44 AM CDT | Special Weather Statement | ILX | 46 min |
| May 13, 9:27 AM CDT | Mesoscale Discussion | SPC | 63 min |
| May 13, 10:26 AM CDT | Areal Flood Advisory | ILX | 4 hr |
| May 13, 2:44 PM CDT | Flood Watch | ILX | 14 hr |
| May 13, 9:56 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 13, 11:27 PM CDT | Severe Thunderstorm Warning | ILX | 48 min |
| May 13, 11:27 PM CDT | Mesoscale Discussion | SPC | 93 min |
| May 13, 11:56 PM CDT | Severe Thunderstorm Warning | ILX | 64 min |
| May 14, 12:07 AM CDT | Severe Thunderstorm Warning | ILX | 38 min |
| May 14, 12:19 AM CDT | Tornado Warning | ILX | 56 min |
| May 14, 12:35 AM CDT | Tornado Warning | ILX | 38 min |
| May 14, 12:44 AM CDT | Severe Thunderstorm Warning | ILX | 61 min |
| May 14, 1:00 AM CDT | Flash Flood Warning | ILX | 6 hr |
| May 14, 7:36 AM CDT | Areal Flood Warning | ILX | 5 hr |
| May 14, 3:02 PM CDT | Flash Flood Watch | ILX | 32 hr |
| May 15, 2:05 PM CDT | Mesoscale Discussion | SPC | 25 min |
| May 15, 2:39 PM CDT | Tornado Watch | SPC | 7 hr |
| May 15, 5:31 PM CDT | Mesoscale Discussion | SPC | 119 min |
| May 15, 7:04 PM CDT | Severe Thunderstorm Warning | ILX | 41 min |
| May 15, 7:57 PM CDT | Flash Flood Warning | ILX | 6 hr |
| May 15, 8:14 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 15, 8:48 PM CDT | Severe Thunderstorm Warning | ILX | 42 min |
| May 16, 1:56 AM CDT | Areal Flood Warning | ILX | 186 days |
| May 29, 3:17 PM CDT | Mesoscale Discussion | SPC | 88 min |
| May 30, 2:44 PM CDT | Mesoscale Discussion | SPC | 91 min |
| May 30, 3:49 PM CDT | Severe Thunderstorm Watch | SPC | 11 hr |
| May 30, 6:01 PM CDT | Mesoscale Discussion | SPC | 59 min |
| May 30, 8:53 PM CDT | Mesoscale Discussion | SPC | 67 min |
| Jun 2, 11:58 AM CDT | Mesoscale Discussion | SPC | 92 min |
| Jun 2, 12:27 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 2, 3:47 PM CDT | Mesoscale Discussion | SPC | 88 min |
| Jun 2, 6:22 PM CDT | Mesoscale Discussion | SPC | 83 min |
| Jun 8, 8:49 AM CDT | Mesoscale Discussion | SPC | 86 min |
| Jun 8, 4:33 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jun 10, 3:13 PM CDT | Mesoscale Discussion | SPC | 92 min |
| Jun 10, 7:10 PM CDT | Mesoscale Discussion | SPC | 65 min |
| Jun 10, 7:46 PM CDT | Tornado Watch | SPC | 6 hr |
| Jun 10, 8:58 PM CDT | Mesoscale Discussion | SPC | 62 min |
| Jun 18, 3:20 AM CDT | Mesoscale Discussion | SPC | 85 min |
| Jun 18, 4:12 AM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jun 18, 6:09 AM CDT | Severe Thunderstorm Warning | ILX | 51 min |
| Jun 18, 6:09 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 18, 6:51 AM CDT | Severe Thunderstorm Warning | ILX | 39 min |
| Jun 18, 7:19 AM CDT | Severe Thunderstorm Warning | ILX | 56 min |
| Jun 19, 9:50 AM CDT | Heat Advisory | ILX | 9 hr |
| Jun 19, 2:24 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 19, 5:37 PM CDT | Mesoscale Discussion | SPC | 53 min |
| Jun 19, 6:42 PM CDT | Severe Thunderstorm Warning | ILX | 48 min |
| Jun 19, 7:59 PM CDT | Mesoscale Discussion | SPC | 91 min |
| Jun 19, 9:45 PM CDT | Mesoscale Discussion | SPC | 30 min |
| Jun 19, 11:51 PM CDT | Areal Flood Advisory | ILX | 5 hr |
| Jun 21, 2:23 PM CDT | Mesoscale Discussion | SPC | 97 min |
| Jun 21, 3:03 PM CDT | Tornado Warning | ILX | 27 min |
| Jun 21, 3:31 PM CDT | Tornado Warning | ILX | 44 min |
| Jun 22, 1:54 AM CDT | Heat Advisory | ILX | 65 hr |
| Jun 24, 3:23 PM CDT | Areal Flood Advisory | ILX | 3 hr |
| Jun 25, 10:38 AM CDT | Heat Advisory | ILX | 8 hr |
| Jun 26, 1:52 AM CDT | Heat Advisory | ILX | 17 hr |
| Jun 27, 9:16 PM CDT | Mesoscale Discussion | SPC | 59 min |
| Jul 8, 3:42 PM CDT | Mesoscale Discussion | SPC | 93 min |
| Jul 15, 2:33 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 24, 11:00 PM CDT | Severe Thunderstorm Watch | SPC | 3 hr |
| Jul 24, 11:46 PM CDT | Mesoscale Discussion | SPC | 89 min |
| Jul 25, 12:37 AM CDT | Severe Thunderstorm Warning | ILX | 53 min |
| Jul 25, 12:56 AM CDT | Severe Thunderstorm Warning | ILX | 64 min |
| Jul 25, 1:32 AM CDT | Severe Thunderstorm Warning | ILX | 73 min |
| Jul 25, 6:35 AM CDT | Special Weather Statement | ILX | 40 min |
| Jul 25, 7:04 AM CDT | Severe Thunderstorm Warning | ILX | 41 min |
| Aug 4, 7:39 AM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Aug 4, 8:53 AM CDT | Severe Thunderstorm Warning | ILX | 67 min |
| Aug 4, 9:57 AM CDT | Severe Thunderstorm Warning | ILX | 63 min |
| Aug 8, 3:10 AM CDT | Heat Advisory | ILX | 40 hr |
| Aug 19, 11:51 AM CDT | Mesoscale Discussion | SPC | 114 min |
| Aug 19, 12:49 PM CDT | Tornado Watch | SPC | 6 hr |
| Aug 19, 3:05 PM CDT | Tornado Watch | SPC | 2 hr |
| Aug 19, 3:19 PM CDT | Mesoscale Discussion | SPC | 86 min |
| Aug 19, 3:52 PM CDT | Severe Thunderstorm Warning | ILX | 38 min |
| Aug 19, 4:30 PM CDT | Severe Thunderstorm Warning | ILX | 45 min |
| Aug 19, 5:14 PM CDT | Severe Thunderstorm Warning | ILX | 46 min |
| Aug 19, 6:00 PM CDT | Severe Thunderstorm Warning | ILX | 75 min |
| Aug 19, 6:51 PM CDT | Severe Thunderstorm Warning | ILX | 20 min |
| Aug 19, 8:56 PM CDT | Flash Flood Watch | ILX | 10 hr |
| Sep 6, 11:38 PM CDT | Dense Fog Advisory | ILX | 9 hr |
| Sep 9, 4:45 AM CDT | Dense Fog Advisory | ILX | 6 hr |
| Sep 10, 2:39 AM CDT | Dense Fog Advisory | ILX | 7 hr |
| Sep 10, 8:43 PM CDT | Dense Fog Advisory | ILX | 11 hr |
| Sep 25, 8:51 PM CDT | Dense Fog Advisory | ILX | 13 hr |
| Sep 26, 1:42 PM CDT | Mesoscale Discussion | SPC | 93 min |
| Sep 27, 8:22 PM CDT | Tornado Watch | SPC | 3 hr |
| Sep 27, 11:04 PM CDT | Mesoscale Discussion | SPC | 86 min |
| Oct 7, 3:43 AM CDT | Flash Flood Watch | ILX | 57 hr |
| Oct 10, 3:12 PM CDT | Frost Advisory | ILX | 18 hr |
| Oct 17, 3:23 AM CDT | Frost Advisory | ILX | 30 hr |
| Oct 28, 3:21 PM CDT | Flash Flood Watch | ILX | 4 days |
| Nov 20, 5:39 AM CST | Dense Fog Advisory | ILX | 3 hr |
| Dec 8, 2:18 PM CST | Wind Advisory | ILX | 28 hr |
| Dec 22, 3:10 PM CST | Flood Watch | ILX | 67 hr |
| Dec 27, 3:14 AM CST | Winter Weather Advisory | ILX | 12 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 | 24 |
| Tornado Warning | 4 |
| Severe Thunderstorm Watch | 9 |
| Tornado Watch | 6 |
| Mesoscale Discussion | 39 |
| Special Weather Statement | 2 |
| Flooding | |
| Areal Flood Warning | 2 |
| Flash Flood Warning | 2 |
| Flash Flood Watch | 4 |
| Flood Watch | 3 |
| Areal Flood Advisory | 4 |
| Winter | |
| Winter Weather Advisory | 4 |
| Heat | |
| Heat Advisory | 5 |
| Cold | |
| Frost Advisory | 2 |
| Wind Chill Advisory | 1 |
| Wind and dust | |
| High Wind Warning | 1 |
| Wind Advisory | 8 |
| 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 archive20082010
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.