Alert archive / Ohio / Mercer County
Weather alerts in Mercer County, Ohio, 2023
86 weather alerts in 2023, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Mercer County and its neighbors
Each county as a circle sized by its count in 2023. Tap one for its archive.
- Alerts
- 86
- Warnings
- 18
- Watches
- 15
- Advisories
- 24
- Busiest month
- July23 alerts
- Busiest day
- July 20, 20237 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 2 tornado warnings covering Mercer County in 2023 had a tornado report inside them; 0 of 1 tornado reports fell inside a warning.
Mercer County, 2023
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 2 | 1 | 50% | 1 | 0% | |
| Severe thunderstorm warnings | 7 | 5 | 29% | 10 | 100% | 22 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2023
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Wilmington, OH: tornado warnings | 36 | 11 | 69% | 24 | 54% | 13 min |
| NWS Wilmington, OH: severe thunderstorm warnings | 211 | 126 | 40% | 397 | 68% | 20 min |
| NWS Wilmington, OH: flash flood warnings | 21 | 9 | 57% | 30 | 87% | 68 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 2, 4:46 PM EST | Dense Fog Advisory | ILN | 8 hr |
| Jan 12, 1:42 AM EST | Dense Fog Advisory | ILN | 6 hr |
| Jan 18, 2:56 PM EST | Wind Advisory | ILN | 28 hr |
| Jan 19, 1:13 PM EST | Mesoscale Discussion | SPC | 2 hr |
| Jan 19, 1:54 PM EST | Severe Thunderstorm Watch | SPC | 5 hr |
| Jan 19, 3:39 PM EST | Mesoscale Discussion | SPC | 96 min |
| Jan 22, 7:48 AM EST | Winter Weather Advisory | ILN | 7 hr |
| Jan 23, 3:51 AM EST | Winter Storm Watch | ILN | 24 hr |
| Jan 24, 3:46 AM EST | Winter Storm Warning | ILN | 35 hr |
| Jan 30, 5:58 AM EST | Winter Weather Advisory | ILN | 6 hr |
| Feb 7, 3:03 PM EST | High Wind Watch | ILN | 24 hr |
| Feb 8, 3:12 AM EST | Wind Advisory | ILN | 44 hr |
| Feb 8, 2:59 PM EST | High Wind Warning | ILN | 28 hr |
| Feb 14, 3:38 AM EST | Wind Advisory | ILN | 36 hr |
| Feb 22, 6:17 AM EST | Special Weather Statement | ILN | 28 min |
| Feb 22, 6:43 AM EST | Special Weather Statement | ILN | 32 min |
| Feb 22, 6:57 AM EST | Areal Flood Advisory | ILN | 3 hr |
| Feb 23, 3:20 AM EST | Dense Fog Advisory | ILN | 6 hr |
| Feb 26, 3:15 AM EST | Wind Advisory | ILN | 42 hr |
| Feb 27, 12:59 PM EST | Mesoscale Discussion | SPC | 91 min |
| Feb 27, 1:28 PM EST | Tornado Watch | SPC | 5 hr |
| Mar 2, 3:08 AM EST | Flood Watch | ILN | 42 hr |
| Mar 2, 2:34 PM EST | Wind Advisory | ILN | 37 hr |
| Mar 3, 4:55 PM EST | Areal Flood Warning | ILN | 18 hr |
| Mar 24, 12:37 PM EDT | Wind Advisory | ILN | 31 hr |
| Mar 31, 3:36 AM EDT | Wind Advisory | ILN | 31 hr |
| Mar 31, 3:11 PM EDT | High Wind Warning | ILN | 26 hr |
| Mar 31, 11:09 PM EDT | Tornado Watch | SPC | 4 hr |
| Apr 1, 12:12 AM EDT | Severe Thunderstorm Warning | ILN | 63 min |
| Apr 1, 12:44 AM EDT | Tornado Warning | ILN | 31 min |
| Apr 4, 2:28 PM EDT | Wind Advisory | ILN | 27 hr |
| Apr 5, 10:25 AM EDT | Tornado Watch | SPC | 7 hr |
| Apr 5, 1:30 PM EDT | Severe Thunderstorm Warning | ILN | 45 min |
| Apr 5, 1:36 PM EDT | Mesoscale Discussion | SPC | 84 min |
| Apr 18, 1:04 PM EDT | Frost Advisory | ILN | 20 hr |
| Apr 23, 3:58 AM EDT | Freeze Warning | ILN | 29 hr |
| Apr 24, 2:43 PM EDT | Freeze Warning | ILN | 18 hr |
| Apr 25, 3:19 PM EDT | Frost Advisory | ILN | 15 hr |
| Apr 26, 12:20 PM EDT | Frost Advisory | ILN | 21 hr |
| May 3, 3:13 PM EDT | Frost Advisory | ILN | 18 hr |
| Jun 15, 4:21 PM EDT | Mesoscale Discussion | SPC | 114 min |
| Jun 15, 6:03 PM EDT | Severe Thunderstorm Warning | ILN | 42 min |
| Jun 25, 8:06 AM EDT | Special Weather Statement | ILN | 39 min |
| Jun 25, 4:18 PM EDT | Tornado Watch | SPC | 4 hr |
| Jun 25, 9:33 PM EDT | Special Weather Statement | ILN | 27 min |
| Jun 25, 10:10 PM EDT | Special Weather Statement | ILN | |
| Jul 2, 2:05 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 5, 3:39 PM EDT | Special Weather Statement | ILN | 36 min |
| Jul 16, 6:22 PM EDT | Special Weather Statement | ILN | 23 min |
| Jul 16, 6:42 PM EDT | Special Weather Statement | ILN | 33 min |
| Jul 16, 6:45 PM EDT | Mesoscale Discussion | SPC | 90 min |
| Jul 20, 2:15 PM EDT | Mesoscale Discussion | SPC | 90 min |
| Jul 20, 2:45 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 20, 5:01 PM EDT | Mesoscale Discussion | SPC | 89 min |
| Jul 20, 5:36 PM EDT | Special Weather Statement | ILN | 24 min |
| Jul 20, 6:12 PM EDT | Severe Thunderstorm Warning | ILN | 48 min |
| Jul 20, 6:54 PM EDT | Severe Thunderstorm Warning | ILN | 26 min |
| Jul 20, 7:46 PM EDT | Severe Thunderstorm Warning | ILN | 29 min |
| Jul 24, 2:49 PM EDT | Mesoscale Discussion | SPC | 116 min |
| Jul 24, 3:37 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 26, 3:21 AM EDT | Heat Advisory | ILN | 66 hr |
| Jul 26, 1:45 PM EDT | Mesoscale Discussion | SPC | 90 min |
| Jul 28, 6:59 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 28, 8:38 PM EDT | Mesoscale Discussion | SPC | 97 min |
| Jul 28, 9:24 PM EDT | Special Weather Statement | ILN | 36 min |
| Jul 29, 1:57 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 29, 2:52 AM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 29, 3:16 AM EDT | Severe Thunderstorm Warning | ILN | 59 min |
| Jul 29, 3:39 AM EDT | Tornado Warning | ILN | 22 min |
| Aug 12, 11:37 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 22, 3:28 AM EDT | Excessive Heat Watch | ILN | 48 hr |
| Aug 23, 2:18 PM EDT | Excessive Heat Warning | ILN | 30 hr |
| Aug 24, 4:03 AM EDT | Mesoscale Discussion | SPC | 117 min |
| Aug 24, 11:42 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 27, 6:13 PM EDT | Special Weather Statement | ILN | 32 min |
| Sep 27, 6:47 PM EDT | Special Weather Statement | ILN | 28 min |
| Sep 27, 7:47 PM EDT | Special Weather Statement | ILN | 28 min |
| Sep 30, 1:23 AM EDT | Dense Fog Advisory | ILN | 9 hr |
| Oct 10, 1:07 PM EDT | Frost Advisory | ILN | 20 hr |
| Oct 21, 2:48 PM EDT | Freeze Watch | ILN | 11 hr |
| Oct 22, 1:37 AM EDT | Freeze Warning | ILN | 31 hr |
| Oct 29, 2:46 PM EDT | Freeze Watch | ILN | 12 hr |
| Oct 30, 3:02 AM EDT | Freeze Warning | ILN | 31 hr |
| Dec 3, 6:35 AM EST | Dense Fog Advisory | ILN | 3 hr |
| Dec 17, 1:37 PM EST | Winter Weather Advisory | ILN | 28 hr |
| Dec 23, 8:01 PM EST | Dense Fog Advisory | ILN | 15 hr |
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20222024
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.