Alert archive / Ohio / Mercer County
Weather alerts in Mercer County, Ohio, 2024
80 weather alerts in 2024, 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 2024. Tap one for its archive.
- Alerts
- 80
- Warnings
- 12
- Watches
- 11
- Advisories
- 28
- Busiest month
- April17 alerts
- Busiest day
- March 14, 20249 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
3 of 4 tornado warnings covering Mercer County in 2024 had a tornado report inside them; 4 of 6 tornado reports fell inside a warning, on average 7 minutes after it went out.
Mercer County, 2024
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 4 | 3 | 25% | 6 | 67% | 7 min |
| Severe thunderstorm warnings | 4 | 3 | 25% | 8 | 63% | 21 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2024
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Wilmington, OH: tornado warnings | 79 | 26 | 67% | 65 | 72% | 13 min |
| NWS Wilmington, OH: severe thunderstorm warnings | 183 | 90 | 51% | 414 | 59% | 21 min |
| NWS Wilmington, OH: flash flood warnings | 24 | 12 | 50% | 69 | 57% | 71 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, 3:06 AM EST | Wind Advisory | ILN | 29 hr |
| Jan 11, 1:54 PM EST | Wind Advisory | ILN | 48 hr |
| Jan 13, 3:29 AM EST | Wind Chill Advisory | ILN | 57 hr |
| Jan 15, 3:04 PM EST | Wind Chill Advisory | ILN | 20 hr |
| Jan 16, 3:05 AM EST | Wind Chill Advisory | ILN | 31 hr |
| Jan 17, 9:49 PM EST | Winter Weather Advisory | ILN | 56 hr |
| Jan 22, 3:08 AM EST | Winter Weather Advisory | ILN | 32 hr |
| Jan 23, 4:56 PM EST | Dense Fog Advisory | ILN | 15 hr |
| Jan 24, 2:24 PM EST | Dense Fog Advisory | ILN | 23 hr |
| Jan 26, 3:31 PM EST | Dense Fog Advisory | ILN | 19 hr |
| Feb 16, 3:08 AM EST | Winter Weather Advisory | ILN | 22 hr |
| Feb 16, 12:26 PM EST | Mesoscale Discussion | SPC | 4 hr |
| Feb 22, 7:58 PM EST | Dense Fog Advisory | ILN | 13 hr |
| Feb 24, 5:07 AM EST | Winter Weather Advisory | ILN | 6 hr |
| Mar 14, 10:49 AM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Mar 14, 12:55 PM EDT | Mesoscale Discussion | SPC | 65 min |
| Mar 14, 12:56 PM EDT | Special Weather Statement | ILN | 34 min |
| Mar 14, 4:36 PM EDT | Mesoscale Discussion | SPC | 114 min |
| Mar 14, 5:13 PM EDT | Tornado Watch | SPC | 7 hr |
| Mar 14, 6:28 PM EDT | Mesoscale Discussion | SPC | 92 min |
| Mar 14, 6:31 PM EDT | Severe Thunderstorm Warning | ILN | 44 min |
| Mar 14, 6:47 PM EDT | Tornado Warning | ILN | 28 min |
| Mar 14, 7:13 PM EDT | Severe Thunderstorm Warning | ILN | 32 min |
| Mar 26, 2:08 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Mar 31, 12:39 PM EDT | Flood Watch | ILN | 58 hr |
| Apr 2, 6:49 AM EDT | Areal Flood Advisory | ILN | 5 hr |
| Apr 2, 5:36 PM EDT | Areal Flood Advisory | ILN | 3 hr |
| Apr 4, 3:39 PM EDT | Freeze Watch | ILN | 12 hr |
| Apr 5, 3:42 AM EDT | Freeze Warning | ILN | 29 hr |
| Apr 6, 9:09 AM EDT | Frost Advisory | ILN | 25 hr |
| Apr 9, 8:31 PM EDT | Special Weather Statement | ILN | 44 min |
| Apr 11, 10:22 AM EDT | Flood Watch | ILN | 16 hr |
| Apr 12, 10:01 AM EDT | Wind Advisory | ILN | 10 hr |
| Apr 17, 11:50 AM EDT | Mesoscale Discussion | SPC | 85 min |
| Apr 17, 12:18 PM EDT | Tornado Watch | SPC | 7 hr |
| Apr 17, 1:17 PM EDT | Special Weather Statement | ILN | 28 min |
| Apr 17, 1:37 PM EDT | Severe Thunderstorm Warning | ILN | 38 min |
| Apr 17, 2:12 PM EDT | Mesoscale Discussion | SPC | 93 min |
| Apr 21, 2:58 AM EDT | Frost Advisory | ILN | 30 hr |
| Apr 23, 2:41 PM EDT | Freeze Watch | ILN | 24 hr |
| Apr 24, 2:16 PM EDT | Freeze Warning | ILN | 19 hr |
| Apr 25, 2:14 PM EDT | Frost Advisory | ILN | 19 hr |
| May 7, 4:33 PM EDT | Mesoscale Discussion | SPC | 87 min |
| May 7, 6:00 PM EDT | Tornado Watch | SPC | 8 hr |
| May 7, 7:40 PM EDT | Special Weather Statement | ILN | 35 min |
| May 7, 7:46 PM EDT | Tornado Warning | ILN | 29 min |
| May 7, 7:56 PM EDT | Mesoscale Discussion | SPC | 94 min |
| May 7, 8:13 PM EDT | Tornado Warning | ILN | 32 min |
| May 7, 8:24 PM EDT | Tornado Warning | ILN | 36 min |
| May 24, 8:04 PM EDT | Special Weather Statement | ILN | 26 min |
| May 26, 12:20 PM EDT | Mesoscale Discussion | SPC | 85 min |
| May 26, 1:02 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 26, 2:55 PM EDT | Special Weather Statement | ILN | 65 min |
| May 28, 10:03 PM EDT | Special Weather Statement | ILN | 42 min |
| Jun 3, 1:02 AM EDT | Dense Fog Advisory | ILN | 8 hr |
| Jun 5, 11:38 AM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 5, 5:44 PM EDT | Areal Flood Advisory | ILN | 2 hr |
| Jun 16, 3:24 AM EDT | Excessive Heat Watch | ILN | 24 hr |
| Jun 17, 3:01 AM EDT | Heat Advisory | ILN | 6 days |
| Jun 17, 1:28 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 19, 1:47 PM EDT | Mesoscale Discussion | SPC | 88 min |
| Jun 19, 2:33 PM EDT | Special Weather Statement | ILN | 27 min |
| Jul 9, 11:35 PM EDT | Areal Flood Advisory | ILN | 3 hr |
| Jul 14, 10:08 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 14, 12:46 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 14, 1:20 PM EDT | Severe Thunderstorm Warning | ILN | 55 min |
| Jul 16, 1:32 AM EDT | Special Weather Statement | ILN | 28 min |
| Jul 16, 1:38 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 16, 2:04 AM EDT | Special Weather Statement | ILN | 26 min |
| Jul 24, 2:06 PM EDT | Mesoscale Discussion | SPC | 114 min |
| Aug 1, 3:19 PM EDT | Mesoscale Discussion | SPC | 116 min |
| Aug 6, 6:30 PM EDT | Special Weather Statement | ILN | 60 min |
| Aug 26, 2:46 PM EDT | Heat Advisory | ILN | 53 hr |
| Oct 15, 3:03 AM EDT | Freeze Warning | ILN | 30 hr |
| Oct 16, 12:15 PM EDT | Freeze Warning | ILN | 21 hr |
| Oct 17, 1:39 PM EDT | Frost Advisory | ILN | 19 hr |
| Oct 31, 3:30 AM EDT | Wind Advisory | ILN | 10 hr |
| Dec 4, 10:28 PM EST | Special Weather Statement | ILN | 92 min |
| Dec 10, 7:17 AM EST | Dense Fog Advisory | ILN | 3 hr |
| Dec 29, 2:40 AM EST | Wind Advisory | ILN | 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 | 4 |
| Tornado Warning | 4 |
| Severe Thunderstorm Watch | 3 |
| Tornado Watch | 3 |
| Mesoscale Discussion | 17 |
| Special Weather Statement | 12 |
| Flooding | |
| Flood Watch | 2 |
| Areal Flood Advisory | 4 |
| Winter | |
| Winter Weather Advisory | 4 |
| Heat | |
| Excessive Heat Watch | 1 |
| Heat Advisory | 2 |
| Cold | |
| Freeze Warning | 4 |
| Freeze Watch | 2 |
| Frost Advisory | 4 |
| Wind Chill Advisory | 3 |
| Wind and dust | |
| Wind Advisory | 5 |
| Fog and smoke | |
| Dense Fog Advisory | 6 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20232025
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.