Alert archive / Ohio / Shelby County
Weather alerts in Shelby County, Ohio, 2020
130 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
- 130
- Warnings
- 43
- Watches
- 14
- Advisories
- 25
- Busiest month
- April18 alerts
- Busiest day
- September 8, 20209 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 | 21 | 15 | 29% | 16 | 75% | 13 min |
| Flash flood warnings | 3 | 3 | 0% | 1 | 100% | 76 min |
Each office's whole area, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Wilmington, OH: tornado warnings | 24 | 12 | 50% | 32 | 56% | 10 min |
| NWS Wilmington, OH: severe thunderstorm warnings | 236 | 157 | 33% | 673 | 77% | 19 min |
| NWS Wilmington, OH: flash flood warnings | 38 | 25 | 34% | 85 | 79% | 129 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, Eastern Time. Each opens its own page with the text, the map, the radar and the sounding.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jan 9, 3:15 PM EST | Flood Watch | ILN | 49 hr |
| Jan 10, 3:08 PM EST | Wind Advisory | ILN | 30 hr |
| Jan 11, 10:50 AM EST | River Flood Warning | ILN | 8 hr |
| Jan 11, 3:57 PM EST | High Wind Warning | ILN | 12 hr |
| Jan 15, 12:17 AM EST | Dense Fog Advisory | ILN | 13 hr |
| Jan 17, 3:10 AM EST | Winter Weather Advisory | ILN | 31 hr |
| Jan 18, 1:01 AM EST | Mesoscale Discussion | SPC | 4 hr |
| Feb 5, 3:04 AM EST | Winter Weather Advisory | ILN | 31 hr |
| Feb 6, 1:52 PM EST | Winter Weather Advisory | ILN | 20 hr |
| Feb 11, 3:16 PM EST | Winter Weather Advisory | ILN | 43 hr |
| Feb 25, 3:32 PM EST | Winter Weather Advisory | ILN | 36 hr |
| Mar 14, 12:01 PM EDT | Mesoscale Discussion | SPC | 119 min |
| Mar 25, 8:26 AM EDT | Dense Fog Advisory | ILN | 3 hr |
| Mar 27, 2:44 PM EDT | Flash Flood Watch | ILN | 19 hr |
| Mar 28, 1:42 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Mar 28, 1:46 PM EDT | Special Weather Statement | ILN | 29 min |
| Mar 28, 3:29 PM EDT | Wind Advisory | ILN | 29 hr |
| Mar 28, 4:03 PM EDT | Mesoscale Discussion | SPC | 87 min |
| Mar 28, 6:26 PM EDT | Areal Flood Advisory | ILN | 3 hr |
| Mar 28, 6:49 PM EDT | Flash Flood Warning | ILN | 3 hr |
| Mar 28, 7:44 PM EDT | Mesoscale Discussion | SPC | 61 min |
| Mar 28, 9:37 PM EDT | Areal Flood Warning | ILN | 8 hr |
| Mar 28, 9:49 PM EDT | River Flood Warning | ILN | 14 hr |
| Mar 28, 10:02 PM EDT | Flash Flood Watch | ILN | 6 hr |
| Mar 28, 10:23 PM EDT | Mesoscale Discussion | SPC | 97 min |
| Mar 28, 11:40 PM EDT | Severe Thunderstorm Warning | ILN | 50 min |
| Apr 7, 12:03 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 7, 10:04 PM EDT | Mesoscale Discussion | SPC | 86 min |
| Apr 7, 11:40 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Apr 8, 1:24 AM EDT | Severe Thunderstorm Warning | ILN | 51 min |
| Apr 8, 1:47 AM EDT | Severe Thunderstorm Warning | ILN | 43 min |
| Apr 8, 9:20 PM EDT | Special Weather Statement | ILN | 40 min |
| Apr 8, 9:56 PM EDT | Special Weather Statement | ILN | 49 min |
| Apr 9, 3:49 PM EDT | Freeze Watch | ILN | 12 hr |
| Apr 9, 3:49 PM EDT | Freeze Warning | ILN | 17 hr |
| Apr 10, 3:31 AM EDT | Freeze Warning | ILN | 29 hr |
| Apr 11, 3:32 PM EDT | High Wind Watch | ILN | 24 hr |
| Apr 12, 3:17 PM EDT | Wind Advisory | ILN | 27 hr |
| Apr 13, 3:44 PM EDT | Freeze Warning | ILN | 17 hr |
| Apr 14, 3:05 AM EDT | Freeze Warning | ILN | 30 hr |
| Apr 15, 3:56 AM EDT | Freeze Warning | ILN | 29 hr |
| Apr 17, 3:46 AM EDT | Freeze Warning | ILN | 29 hr |
| Apr 21, 3:46 AM EDT | Freeze Warning | ILN | 30 hr |
| Apr 29, 1:41 PM EDT | Special Weather Statement | ILN | 49 min |
| May 7, 3:39 AM EDT | Freeze Warning | ILN | 53 hr |
| May 10, 12:20 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 10, 2:16 PM EDT | Special Weather Statement | ILN | 44 min |
| May 10, 2:37 PM EDT | Severe Thunderstorm Warning | ILN | 23 min |
| May 10, 2:54 PM EDT | Severe Thunderstorm Warning | ILN | 51 min |
| May 10, 2:58 PM EDT | Special Weather Statement | ILN | 47 min |
| May 10, 3:11 PM EDT | Severe Thunderstorm Warning | ILN | 49 min |
| May 10, 3:30 PM EDT | Severe Thunderstorm Warning | ILN | 60 min |
| May 11, 3:14 AM EDT | Freeze Warning | ILN | 29 hr |
| May 12, 3:48 PM EDT | Frost Advisory | ILN | 17 hr |
| May 14, 4:26 PM EDT | Special Weather Statement | ILN | 34 min |
| May 14, 4:29 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 16, 12:53 AM EDT | Dense Fog Advisory | ILN | 8 hr |
| May 17, 3:20 PM EDT | Flash Flood Watch | ILN | 4 days |
| May 19, 10:12 AM EDT | River Flood Warning | ILN | 34 hr |
| May 26, 5:59 PM EDT | Special Weather Statement | ILN | 31 min |
| Jun 4, 11:11 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 9, 5:05 PM EDT | Special Weather Statement | ILN | 25 min |
| Jun 9, 5:11 PM EDT | Severe Thunderstorm Warning | ILN | 16 min |
| Jun 9, 5:31 PM EDT | Special Weather Statement | ILN | 29 min |
| Jun 10, 1:58 PM EDT | Mesoscale Discussion | SPC | 92 min |
| Jun 10, 2:48 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 10, 4:06 PM EDT | Severe Thunderstorm Warning | ILN | 39 min |
| Jun 10, 4:21 PM EDT | Severe Thunderstorm Warning | ILN | 54 min |
| Jun 10, 4:38 PM EDT | Severe Thunderstorm Warning | ILN | 23 min |
| Jun 10, 4:41 PM EDT | Severe Thunderstorm Warning | ILN | 49 min |
| Jun 10, 4:58 PM EDT | Severe Thunderstorm Warning | ILN | 32 min |
| Jun 10, 5:02 PM EDT | Mesoscale Discussion | SPC | 88 min |
| Jun 21, 4:20 PM EDT | Special Weather Statement | ILN | 25 min |
| Jun 21, 4:37 PM EDT | Severe Thunderstorm Warning | ILN | 38 min |
| Jun 21, 4:56 PM EDT | Special Weather Statement | ILN | 34 min |
| Jun 26, 10:40 PM EDT | Mesoscale Discussion | SPC | 95 min |
| Jun 26, 11:15 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jun 27, 12:35 AM EDT | Mesoscale Discussion | SPC | 115 min |
| Jul 8, 3:29 PM EDT | Heat Advisory | ILN | 29 hr |
| Jul 9, 6:18 PM EDT | Special Weather Statement | ILN | 27 min |
| Jul 10, 12:33 PM EDT | Mesoscale Discussion | SPC | 87 min |
| Jul 10, 12:50 PM EDT | Special Weather Statement | ILN | 25 min |
| Jul 12, 2:24 PM EDT | Special Weather Statement | ILN | 51 min |
| Jul 12, 3:17 PM EDT | Special Weather Statement | ILN | 43 min |
| Jul 18, 3:25 PM EDT | Heat Advisory | ILN | 29 hr |
| Jul 19, 3:10 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 19, 3:30 PM EDT | Special Weather Statement | ILN | 30 min |
| Jul 19, 3:38 PM EDT | Severe Thunderstorm Warning | ILN | 37 min |
| Jul 19, 3:55 PM EDT | Severe Thunderstorm Warning | ILN | 50 min |
| Jul 21, 4:48 PM EDT | Special Weather Statement | ILN | 27 min |
| Jul 21, 4:55 PM EDT | Severe Thunderstorm Warning | ILN | 29 min |
| Jul 22, 8:47 PM EDT | Special Weather Statement | ILN | 28 min |
| Jul 27, 1:14 PM EDT | Mesoscale Discussion | SPC | 91 min |
| Jul 27, 2:37 PM EDT | Special Weather Statement | ILN | 38 min |
| Jul 30, 5:11 PM EDT | Special Weather Statement | ILN | 2 hr |
| Aug 1, 2:19 PM EDT | Mesoscale Discussion | SPC | 56 min |
| Aug 10, 6:17 PM EDT | Mesoscale Discussion | SPC | 118 min |
| Aug 10, 8:05 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Aug 10, 8:29 PM EDT | Mesoscale Discussion | SPC | 91 min |
| Aug 10, 8:36 PM EDT | Severe Thunderstorm Warning | ILN | 39 min |
| Aug 10, 8:41 PM EDT | Severe Thunderstorm Warning | ILN | 34 min |
| Aug 10, 9:02 PM EDT | Special Weather Statement | ILN | 43 min |
| Aug 14, 10:57 AM EDT | Flash Flood Watch | ILN | 24 hr |
| Aug 28, 1:32 PM EDT | Mesoscale Discussion | SPC | 88 min |
| Sep 1, 5:05 AM EDT | Dense Fog Advisory | ILN | 5 hr |
| Sep 7, 4:12 PM EDT | Special Weather Statement | ILN | 33 min |
| Sep 7, 9:40 PM EDT | Areal Flood Advisory | ILN | 3 hr |
| Sep 7, 10:07 PM EDT | Flash Flood Watch | ILN | 7 hr |
| Sep 7, 10:12 PM EDT | Flash Flood Warning | ILN | 4 hr |
| Sep 7, 10:58 PM EDT | Flash Flood Warning | ILN | 6 hr |
| Sep 7, 11:23 PM EDT | Special Weather Statement | ILN | 37 min |
| Sep 7, 11:31 PM EDT | Severe Thunderstorm Warning | ILN | 18 min |
| Sep 8, 12:41 AM EDT | Areal Flood Advisory | ILN | 3 hr |
| Sep 8, 1:45 AM EDT | Areal Flood Warning | ILN | 8 hr |
| Sep 8, 5:03 AM EDT | Areal Flood Warning | ILN | 4 hr |
| Oct 2, 2:22 PM EDT | Frost Advisory | ILN | 18 hr |
| Oct 5, 6:14 AM EDT | Dense Fog Advisory | ILN | 6 hr |
| Oct 15, 3:51 AM EDT | Frost Advisory | ILN | 29 hr |
| Oct 16, 3:58 AM EDT | Frost Advisory | ILN | 29 hr |
| Oct 16, 1:38 PM EDT | Freeze Warning | ILN | 19 hr |
| Oct 23, 1:21 PM EDT | Mesoscale Discussion | SPC | 114 min |
| Oct 23, 1:56 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Oct 23, 5:19 PM EDT | Special Weather Statement | ILN | 26 min |
| Oct 23, 5:38 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Oct 30, 3:21 AM EDT | Freeze Warning | ILN | 31 hr |
| Nov 14, 3:09 AM EST | Wind Advisory | ILN | 40 hr |
| Nov 15, 3:53 AM EST | High Wind Warning | ILN | 15 hr |
| Nov 15, 10:49 AM EST | Severe Thunderstorm Warning | ILN | 26 min |
| Nov 18, 3:46 PM EST | Wind Advisory | ILN | 25 hr |
| Nov 29, 3:30 PM EST | Winter Weather Advisory | ILN | 43 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 | 21 |
| Severe Thunderstorm Watch | 6 |
| Mesoscale Discussion | 23 |
| Special Weather Statement | 25 |
| Flooding | |
| Areal Flood Warning | 3 |
| Flash Flood Warning | 3 |
| River Flood Warning | 3 |
| Flash Flood Watch | 5 |
| Flood Watch | 1 |
| Areal Flood Advisory | 3 |
| Winter | |
| Winter Weather Advisory | 6 |
| Heat | |
| Heat Advisory | 2 |
| Cold | |
| Freeze Warning | 11 |
| Freeze Watch | 1 |
| Frost Advisory | 4 |
| Wind and dust | |
| High Wind Warning | 2 |
| High Wind Watch | 1 |
| Wind Advisory | 5 |
| Fog and smoke | |
| Dense Fog Advisory | 5 |
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.