Alert archive / Ohio / Mercer County
Weather alerts in Mercer County, Ohio, 2010
149 weather alerts in 2010, 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 2010. Tap one for its archive.
- Alerts
- 149
- Warnings
- 25
- Watches
- 27
- Advisories
- 39
- Busiest month
- June49 alerts
- Busiest day
- June 5, 20108 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 2010 had a tornado report inside them.
Mercer County, 2010
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 2 | 1 | 50% | 0 | ||
| Severe thunderstorm warnings | 13 | 10 | 23% | 4 | 75% | 38 min |
| Flash flood warnings | 2 | 2 | 0% | 1 | 100% | 37 min |
Each office's whole area, 2010
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Wilmington, OH: tornado warnings | 42 | 13 | 69% | 21 | 86% | 16 min |
| NWS Wilmington, OH: severe thunderstorm warnings | 268 | 199 | 26% | 460 | 85% | 23 min |
| NWS Wilmington, OH: flash flood warnings | 45 | 29 | 36% | 66 | 86% | 120 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 3, 4:00 AM EST | Wind Chill Advisory | ILN | 8 hr |
| Jan 6, 4:00 PM EST | Winter Weather Advisory | ILN | 48 hr |
| Jan 15, 11:23 PM EST | Freezing Fog Advisory | ILN | 10 hr |
| Jan 16, 7:09 PM EST | Dense Fog Advisory | ILN | 11 hr |
| Jan 17, 5:55 PM EST | Dense Fog Advisory | ILN | 9 hr |
| Feb 4, 3:11 PM EST | Winter Storm Warning | ILN | 49 hr |
| Feb 7, 4:39 PM EST | Winter Storm Watch | ILN | 24 hr |
| Feb 8, 4:05 PM EST | Winter Storm Warning | ILN | 48 hr |
| Feb 14, 2:47 PM EST | Winter Weather Advisory | ILN | 49 hr |
| Feb 22, 10:23 AM EST | Dense Fog Advisory | ILN | 6 hr |
| Feb 26, 3:50 AM EST | Winter Weather Advisory | ILN | 26 hr |
| Apr 2, 5:08 AM EDT | Fire Weather Watch | ILN | 6 hr |
| Apr 2, 11:31 AM EDT | Red Flag Warning | ILN | 8 hr |
| Apr 16, 1:28 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Apr 27, 3:46 AM EDT | Freeze Watch | ILN | 12 hr |
| Apr 27, 3:57 PM EDT | Freeze Warning | ILN | 17 hr |
| May 3, 6:12 PM EDT | Mesoscale Discussion | SPC | 93 min |
| May 3, 7:34 PM EDT | Severe Thunderstorm Warning | ILN | 41 min |
| May 5, 2:52 PM EDT | Mesoscale Discussion | SPC | 113 min |
| May 5, 3:48 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 5, 7:09 PM EDT | Mesoscale Discussion | SPC | 96 min |
| May 5, 9:42 PM EDT | Mesoscale Discussion | SPC | 63 min |
| May 7, 2:59 PM EDT | Mesoscale Discussion | SPC | 91 min |
| May 7, 3:30 PM EDT | Tornado Watch | SPC | 9 hr |
| May 7, 7:25 PM EDT | Mesoscale Discussion | SPC | 95 min |
| May 8, 11:23 AM EDT | Wind Advisory | ILN | 6 hr |
| May 9, 3:51 AM EDT | Frost Advisory | ILN | 29 hr |
| May 11, 7:17 PM EDT | Mesoscale Discussion | SPC | 88 min |
| May 13, 12:02 PM EDT | Mesoscale Discussion | SPC | 118 min |
| May 13, 1:46 PM EDT | Tornado Watch | SPC | 6 hr |
| May 13, 4:02 PM EDT | Mesoscale Discussion | SPC | 88 min |
| May 14, 1:48 AM EDT | Mesoscale Discussion | SPC | 87 min |
| May 21, 11:26 AM EDT | Mesoscale Discussion | SPC | 64 min |
| May 21, 7:27 PM EDT | Areal Flood Advisory | ILN | 3 hr |
| May 21, 10:42 PM EDT | Areal Flood Advisory | ILN | 3 hr |
| May 22, 1:48 AM EDT | Areal Flood Advisory | ILN | 5 hr |
| May 27, 2:26 PM EDT | Special Weather Statement | ILN | 64 min |
| May 27, 5:43 PM EDT | Special Weather Statement | ILN | 62 min |
| May 27, 6:17 PM EDT | Areal Flood Advisory | ILN | 118 min |
| May 27, 8:18 PM EDT | Areal Flood Advisory | ILN | 117 min |
| May 31, 1:57 PM EDT | Areal Flood Advisory | ILN | 3 hr |
| May 31, 6:10 PM EDT | Areal Flood Advisory | ILN | 3 hr |
| Jun 2, 7:57 AM EDT | Special Weather Statement | ILN | 63 min |
| Jun 4, 12:15 PM EDT | Mesoscale Discussion | SPC | 60 min |
| Jun 4, 1:14 PM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jun 4, 3:45 PM EDT | Mesoscale Discussion | SPC | 60 min |
| Jun 4, 9:56 PM EDT | Special Weather Statement | ILN | 64 min |
| Jun 4, 10:10 PM EDT | Severe Thunderstorm Warning | ILN | 50 min |
| Jun 4, 10:52 PM EDT | Severe Thunderstorm Warning | ILN | 38 min |
| Jun 4, 10:53 PM EDT | Mesoscale Discussion | SPC | 67 min |
| Jun 5, 4:07 AM EDT | Flash Flood Watch | ILN | 28 hr |
| Jun 5, 8:51 AM EDT | Mesoscale Discussion | SPC | 114 min |
| Jun 5, 1:35 PM EDT | Mesoscale Discussion | SPC | 85 min |
| Jun 5, 2:08 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 5, 9:47 PM EDT | Mesoscale Discussion | SPC | 58 min |
| Jun 5, 10:11 PM EDT | Tornado Watch | SPC | 7 hr |
| Jun 6, 12:17 AM EDT | Mesoscale Discussion | SPC | 118 min |
| Jun 6, 2:03 AM EDT | Tornado Watch | SPC | 7 hr |
| Jun 6, 3:05 AM EDT | Special Weather Statement | ILN | 55 min |
| Jun 6, 3:38 AM EDT | Severe Thunderstorm Warning | ILN | 37 min |
| Jun 6, 3:38 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 11, 1:38 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 12, 5:47 PM EDT | Mesoscale Discussion | SPC | 88 min |
| Jun 12, 8:34 PM EDT | Mesoscale Discussion | SPC | 26 min |
| Jun 12, 8:38 PM EDT | Severe Thunderstorm Watch | SPC | 3 hr |
| Jun 12, 10:01 PM EDT | Areal Flood Advisory | ILN | 2 hr |
| Jun 14, 12:20 PM EDT | Flash Flood Watch | ILN | 40 hr |
| Jun 14, 2:45 PM EDT | Mesoscale Discussion | SPC | 60 min |
| Jun 14, 9:26 PM EDT | Areal Flood Advisory | ILN | 3 hr |
| Jun 14, 9:47 PM EDT | Flash Flood Warning | ILN | 3 hr |
| Jun 14, 10:24 PM EDT | Severe Thunderstorm Warning | ILN | 51 min |
| Jun 15, 12:43 AM EDT | Areal Flood Warning | ILN | 3 hr |
| Jun 15, 5:47 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 15, 6:58 PM EDT | Mesoscale Discussion | SPC | 62 min |
| Jun 15, 8:41 PM EDT | Mesoscale Discussion | SPC | 64 min |
| Jun 15, 9:26 PM EDT | Special Weather Statement | ILN | 79 min |
| Jun 18, 6:30 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 18, 7:56 PM EDT | Mesoscale Discussion | SPC | 94 min |
| Jun 18, 8:26 PM EDT | Special Weather Statement | ILN | 64 min |
| Jun 18, 8:51 PM EDT | Severe Thunderstorm Warning | ILN | 54 min |
| Jun 22, 3:27 AM EDT | Mesoscale Discussion | SPC | 93 min |
| Jun 23, 11:52 AM EDT | Mesoscale Discussion | SPC | 53 min |
| Jun 23, 10:43 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jun 23, 10:57 PM EDT | Severe Thunderstorm Warning | ILN | 48 min |
| Jun 24, 12:13 AM EDT | Mesoscale Discussion | SPC | 62 min |
| Jun 27, 11:02 AM EDT | Mesoscale Discussion | SPC | 118 min |
| Jun 27, 11:38 AM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 27, 2:43 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 27, 6:53 PM EDT | Special Weather Statement | ILN | 67 min |
| Jun 27, 7:37 PM EDT | Severe Thunderstorm Warning | ILN | 53 min |
| Jun 27, 7:53 PM EDT | Areal Flood Advisory | ILN | 3 hr |
| Jul 15, 11:08 AM EDT | Heat Advisory | ILN | 7 hr |
| Jul 15, 3:47 PM EDT | Mesoscale Discussion | SPC | 118 min |
| Jul 15, 6:56 PM EDT | Mesoscale Discussion | SPC | 94 min |
| Jul 18, 6:24 PM EDT | Areal Flood Advisory | ILN | 3 hr |
| Jul 22, 3:53 PM EDT | Heat Advisory | ILN | 28 hr |
| Jul 23, 10:45 PM EDT | Mesoscale Discussion | SPC | 90 min |
| Jul 24, 4:05 AM EDT | Heat Advisory | ILN | 16 hr |
| Jul 24, 4:37 PM EDT | Mesoscale Discussion | SPC | 83 min |
| Jul 24, 6:10 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jul 24, 8:17 PM EDT | Areal Flood Advisory | ILN | 3 hr |
| Jul 24, 8:43 PM EDT | Flash Flood Warning | ILN | 6 hr |
| Jul 24, 9:36 PM EDT | Mesoscale Discussion | SPC | 54 min |
| Jul 25, 4:41 AM EDT | Areal Flood Advisory | ILN | 109 min |
| Jul 28, 6:18 PM EDT | Special Weather Statement | ILN | 57 min |
| Jul 28, 6:43 PM EDT | Severe Thunderstorm Warning | ILN | 41 min |
| Aug 4, 10:11 AM EDT | Mesoscale Discussion | SPC | 34 min |
| Aug 4, 10:37 AM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Aug 4, 11:35 AM EDT | Severe Thunderstorm Warning | ILN | 55 min |
| Aug 4, 12:15 PM EDT | Severe Thunderstorm Warning | ILN | 45 min |
| Aug 4, 6:25 PM EDT | Mesoscale Discussion | SPC | 65 min |
| Aug 4, 7:02 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 4, 7:44 PM EDT | Special Weather Statement | ILN | 106 min |
| Aug 4, 8:50 PM EDT | Severe Thunderstorm Warning | ILN | 55 min |
| Aug 4, 8:55 PM EDT | Mesoscale Discussion | SPC | 65 min |
| Aug 4, 9:35 PM EDT | Areal Flood Advisory | ILN | 3 hr |
| Aug 5, 7:38 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 10, 3:56 PM EDT | Heat Advisory | ILN | 25 hr |
| Aug 15, 1:51 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 15, 4:19 PM EDT | Mesoscale Discussion | SPC | 86 min |
| Aug 15, 6:34 PM EDT | Mesoscale Discussion | SPC | 56 min |
| Sep 16, 1:35 PM EDT | Mesoscale Discussion | SPC | 85 min |
| Sep 16, 2:00 PM EDT | Special Weather Statement | ILN | 60 min |
| Sep 16, 2:10 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Sep 24, 12:13 PM EDT | Wind Advisory | ILN | 3 hr |
| Oct 5, 4:11 PM EDT | Frost Advisory | ILN | 12 hr |
| Oct 13, 5:24 PM EDT | Special Weather Statement | ILN | 66 min |
| Oct 15, 9:44 PM EDT | Frost Advisory | ILN | 11 hr |
| Oct 19, 5:06 AM EDT | Dense Fog Advisory | ILN | 5 hr |
| Oct 21, 3:01 AM EDT | Frost Advisory | ILN | 31 hr |
| Oct 25, 4:09 AM EDT | High Wind Watch | ILN | 12 hr |
| Oct 25, 3:45 PM EDT | Wind Advisory | ILN | 12 hr |
| Oct 26, 3:56 AM EDT | High Wind Warning | ILN | 9 hr |
| Oct 26, 7:00 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Oct 26, 8:55 AM EDT | Tornado Watch | SPC | 7 hr |
| Oct 26, 10:50 AM EDT | Severe Thunderstorm Warning | ILN | 55 min |
| Oct 26, 11:12 AM EDT | Tornado Warning | ILN | 33 min |
| Oct 26, 11:38 AM EDT | Tornado Warning | ILN | 37 min |
| Oct 26, 12:32 PM EDT | Wind Advisory | ILN | 3 hr |
| Oct 27, 3:49 AM EDT | Wind Advisory | ILN | 14 hr |
| Oct 28, 3:37 AM EDT | Freeze Warning | ILN | 25 hr |
| Oct 29, 3:48 PM EDT | Fire Weather Watch | ILN | 12 hr |
| Oct 30, 4:04 AM EDT | Red Flag Warning | ILN | 15 hr |
| Nov 21, 12:27 AM EST | Dense Fog Advisory | ILN | 8 hr |
| Nov 22, 11:30 PM EST | Special Weather Statement | ILN | 45 min |
| Nov 24, 3:23 AM EST | Flood Watch | ILN | 46 hr |
| Nov 24, 12:35 PM EST | Mesoscale Discussion | SPC | 5 hr |
| Dec 11, 3:03 PM EST | Winter Weather Advisory | ILN | 44 hr |
| Dec 29, 3:17 PM EST | Winter Weather Advisory | ILN | 12 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 archive20092011
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.