Alert archive / Illinois / Perry County
Weather alerts in Perry County, Illinois, 2020
100 weather alerts in 2020, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Perry County and its neighbors
Each county as a circle sized by its count in 2020. Tap one for its archive.
- Alerts
- 100
- Warnings
- 24
- Watches
- 17
- Advisories
- 34
- Busiest month
- April18 alerts
- Busiest day
- March 12, 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.
1 of 1 tornado warnings covering Perry County in 2020 had a tornado report inside them; 1 of 1 tornado reports fell inside a warning, on average 12 minutes after it went out.
Perry County, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 1 | 1 | 0% | 1 | 100% | 12 min |
| Severe thunderstorm warnings | 10 | 7 | 30% | 15 | 93% | 26 min |
| Flash flood warnings | 6 | 5 | 17% | 4 | 100% | 125 min |
Each office's whole area, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Paducah, KY: tornado warnings | 45 | 14 | 69% | 33 | 55% | 13 min |
| NWS Paducah, KY: severe thunderstorm warnings | 177 | 82 | 54% | 296 | 72% | 23 min |
| NWS Paducah, KY: flash flood warnings | 106 | 58 | 45% | 95 | 89% | 102 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, 2:59 PM CST | Flash Flood Watch | PAH | 3 days |
| Jan 10, 2:47 AM CST | Wind Advisory | PAH | 39 hr |
| Jan 11, 2:01 AM CST | Flash Flood Warning | PAH | 9 hr |
| Jan 11, 11:26 AM CST | Areal Flood Warning | PAH | 12 hr |
| Jan 16, 2:52 PM CST | Winter Weather Advisory | PAH | 22 hr |
| Jan 29, 7:19 AM CST | Winter Weather Advisory | PAH | 4 hr |
| Feb 11, 10:28 AM CST | Flash Flood Watch | PAH | 34 hr |
| Mar 12, 2:39 AM CDT | Dense Fog Advisory | PAH | 7 hr |
| Mar 12, 11:44 AM CDT | Tornado Watch | SPC | 6 hr |
| Mar 12, 1:00 PM CDT | Severe Thunderstorm Warning | PAH | 45 min |
| Mar 12, 1:28 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Mar 12, 1:39 PM CDT | Severe Thunderstorm Warning | PAH | 51 min |
| Mar 12, 1:46 PM CDT | Areal Flood Advisory | PAH | 2 hr |
| Mar 19, 2:36 AM CDT | Flash Flood Watch | PAH | 25 hr |
| Mar 19, 3:09 PM CDT | Special Weather Statement | PAH | 51 min |
| Mar 19, 3:27 PM CDT | Severe Thunderstorm Warning | PAH | 48 min |
| Mar 19, 3:32 PM CDT | Tornado Warning | PAH | 43 min |
| Mar 19, 3:53 PM CDT | Flash Flood Warning | PAH | 3 hr |
| Mar 25, 3:32 AM CDT | Dense Fog Advisory | PAH | 5 hr |
| Mar 27, 8:02 PM CDT | Mesoscale Discussion | SPC | 88 min |
| Mar 27, 8:11 PM CDT | Special Weather Statement | PAH | 19 min |
| Mar 28, 1:17 PM CDT | Mesoscale Discussion | SPC | 88 min |
| Mar 28, 3:53 PM CDT | Tornado Watch | SPC | 5 hr |
| Apr 6, 6:20 AM CDT | Dense Fog Advisory | PAH | 3 hr |
| Apr 8, 3:45 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 8, 4:24 PM CDT | Tornado Watch | SPC | 7 hr |
| Apr 8, 5:16 PM CDT | Special Weather Statement | PAH | 44 min |
| Apr 8, 5:26 PM CDT | Severe Thunderstorm Warning | PAH | 49 min |
| Apr 8, 5:59 PM CDT | Severe Thunderstorm Warning | PAH | 46 min |
| Apr 8, 6:15 PM CDT | Severe Thunderstorm Warning | PAH | 32 min |
| Apr 8, 7:46 PM CDT | Mesoscale Discussion | SPC | 119 min |
| Apr 12, 3:21 AM CDT | Wind Advisory | PAH | 31 hr |
| Apr 13, 5:57 PM CDT | Freeze Watch | PAH | 9 hr |
| Apr 14, 2:27 AM CDT | Freeze Warning | PAH | 30 hr |
| Apr 15, 1:32 PM CDT | Freeze Warning | PAH | 17 hr |
| Apr 17, 2:27 AM CDT | Frost Advisory | PAH | 30 hr |
| Apr 24, 3:00 AM CDT | Dense Fog Advisory | PAH | 6 hr |
| Apr 28, 6:32 PM CDT | Mesoscale Discussion | SPC | 118 min |
| Apr 28, 6:41 PM CDT | Mesoscale Discussion | SPC | 64 min |
| Apr 28, 7:35 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Apr 28, 9:55 PM CDT | Special Weather Statement | PAH | 50 min |
| May 5, 2:15 AM CDT | Lake Wind Advisory | PAH | 17 hr |
| May 8, 3:59 AM CDT | Frost Advisory | PAH | 28 hr |
| May 8, 3:59 AM CDT | Lake Wind Advisory | PAH | 16 hr |
| May 9, 3:13 PM CDT | Lake Wind Advisory | PAH | 27 hr |
| May 14, 3:25 AM CDT | Lake Wind Advisory | PAH | 16 hr |
| May 15, 5:04 AM CDT | Special Weather Statement | PAH | 71 min |
| May 15, 5:08 AM CDT | Special Weather Statement | PAH | 67 min |
| May 16, 3:38 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| May 17, 1:44 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 24, 8:23 PM CDT | Areal Flood Advisory | PAH | 7 hr |
| May 25, 4:29 PM CDT | Severe Thunderstorm Warning | PAH | 31 min |
| May 25, 7:34 PM CDT | Special Weather Statement | PAH | 41 min |
| May 25, 8:04 PM CDT | Severe Thunderstorm Warning | PAH | 11 min |
| Jun 9, 2:00 AM CDT | Wind Advisory | PAH | 17 hr |
| Jun 10, 4:08 AM CDT | Lake Wind Advisory | PAH | 15 hr |
| Jun 26, 2:27 AM CDT | Lake Wind Advisory | PAH | 19 hr |
| Jun 27, 9:20 AM CDT | Lake Wind Advisory | PAH | 11 hr |
| Jun 30, 3:26 AM CDT | Flash Flood Watch | PAH | 40 hr |
| Jun 30, 5:50 AM CDT | Flash Flood Warning | PAH | 4 hr |
| Jun 30, 2:59 PM CDT | Special Weather Statement | PAH | 46 min |
| Jun 30, 3:15 PM CDT | Flash Flood Warning | PAH | 3 hr |
| Jul 1, 1:17 PM CDT | Areal Flood Advisory | PAH | 3 hr |
| Jul 2, 5:05 AM CDT | Dense Fog Advisory | PAH | 3 hr |
| Jul 15, 1:10 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 15, 6:12 PM CDT | Tornado Watch | SPC | 5 hr |
| Jul 15, 7:19 PM CDT | Severe Thunderstorm Warning | PAH | 41 min |
| Jul 15, 7:52 PM CDT | Flash Flood Warning | PAH | 6 hr |
| Jul 17, 3:10 AM CDT | Heat Advisory | PAH | 64 hr |
| Jul 20, 1:58 PM CDT | Flash Flood Watch | PAH | 5 hr |
| Jul 22, 11:54 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 23, 1:41 PM CDT | Special Weather Statement | PAH | 34 min |
| Jul 23, 1:52 PM CDT | Areal Flood Advisory | PAH | 113 min |
| Jul 23, 2:11 PM CDT | Special Weather Statement | PAH | 34 min |
| Jul 27, 12:14 PM CDT | Mesoscale Discussion | SPC | 91 min |
| Jul 30, 1:52 AM CDT | Flash Flood Watch | PAH | 22 hr |
| Aug 9, 1:58 PM CDT | Heat Advisory | PAH | 29 hr |
| Aug 10, 2:38 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 10, 5:17 PM CDT | Mesoscale Discussion | SPC | 118 min |
| Aug 10, 6:31 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Aug 10, 6:49 PM CDT | Severe Thunderstorm Warning | PAH | 56 min |
| Aug 10, 7:29 PM CDT | Mesoscale Discussion | SPC | 91 min |
| Aug 12, 11:33 AM CDT | Flash Flood Watch | PAH | 7 hr |
| Aug 12, 12:06 PM CDT | Flash Flood Warning | PAH | 3 hr |
| Aug 13, 10:56 AM CDT | Flash Flood Watch | PAH | 9 hr |
| Aug 22, 3:25 AM CDT | Dense Fog Advisory | PAH | 6 hr |
| Sep 12, 6:41 AM CDT | Dense Fog Advisory | PAH | 2 hr |
| Sep 12, 5:58 PM CDT | Areal Flood Advisory | PAH | 3 hr |
| Sep 30, 9:47 AM CDT | Lake Wind Advisory | PAH | 7 hr |
| Oct 4, 2:00 AM CDT | Frost Advisory | PAH | 30 hr |
| Oct 15, 2:58 AM CDT | Frost Advisory | PAH | 30 hr |
| Oct 15, 2:13 PM CDT | Freeze Warning | PAH | 19 hr |
| Oct 16, 3:25 PM CDT | Red Flag Warning | PAH | 28 hr |
| Oct 28, 2:25 AM CDT | Flood Watch | PAH | 32 hr |
| Oct 30, 1:47 PM CDT | Freeze Watch | PAH | 37 hr |
| Nov 1, 2:14 AM CST | Freeze Warning | PAH | 30 hr |
| Nov 14, 3:16 AM CST | Wind Advisory | PAH | 39 hr |
| Nov 14, 1:25 PM CST | Areal Flood Advisory | PAH | 3 hr |
| Nov 19, 3:07 AM CST | Red Flag Warning | PAH | 15 hr |
| Dec 23, 3:34 AM CST | Wind Advisory | PAH | 20 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 | 10 |
| Tornado Warning | 1 |
| Severe Thunderstorm Watch | 2 |
| Tornado Watch | 4 |
| Mesoscale Discussion | 15 |
| Special Weather Statement | 10 |
| Flooding | |
| Areal Flood Warning | 1 |
| Flash Flood Warning | 6 |
| Flash Flood Watch | 8 |
| Flood Watch | 1 |
| Areal Flood Advisory | 6 |
| Winter | |
| Winter Weather Advisory | 2 |
| Heat | |
| Heat Advisory | 2 |
| Cold | |
| Freeze Warning | 4 |
| Freeze Watch | 2 |
| Frost Advisory | 4 |
| Wind and dust | |
| Lake Wind Advisory | 8 |
| Wind Advisory | 5 |
| Fire | |
| Red Flag Warning | 2 |
| Fog and smoke | |
| Dense Fog Advisory | 7 |
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.