Alert archive / Ohio / Mercer County

Weather alerts in Mercer County, Ohio, 2025

92 weather alerts in 2025, 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 2025. Tap one for its archive.

Alerts
92
Warnings
14
Watches
13
Advisories
37
Busiest month
April17 alerts
Busiest day
June 18, 20255 alerts

Over time

By month

Warning verification

How often warnings here had a storm report inside them, and how much warning the reports had.

Mercer County, 2025

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings9811%5100%29 min
Flash flood warnings00

Each office's whole area, 2025

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Wilmington, OH: tornado warnings37586%2227%10 min
NWS Wilmington, OH: severe thunderstorm warnings22313838%55376%27 min
NWS Wilmington, OH: flash flood warnings462643%10972%85 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.

IssuedProductOfficeLasted
Jan 2, 2:32 PM ESTWinter Weather AdvisoryILN18 hr
Jan 4, 1:34 PM ESTWinter Weather AdvisoryILN48 hr
Jan 9, 3:51 AM ESTWinter Weather AdvisoryILN49 hr
Jan 14, 4:41 PM ESTWinter Weather AdvisoryILN3 hr
Jan 17, 2:15 PM ESTExtreme Cold WatchILN36 hr
Jan 19, 2:30 AM ESTCold Weather AdvisoryILN3 days
Jan 31, 3:09 AM ESTDense Fog AdvisoryILN5 hr
Feb 5, 3:16 AM ESTWinter Weather AdvisoryILN28 hr
Feb 5, 9:43 PM ESTMesoscale DiscussionSPC6 hr
Feb 8, 3:44 AM ESTWinter Weather AdvisoryILN18 hr
Feb 8, 12:46 PM ESTMesoscale DiscussionSPC5 hr
Feb 11, 3:19 PM ESTWinter Weather AdvisoryILN36 hr
Feb 12, 3:29 PM ESTMesoscale DiscussionSPC4 hr
Feb 14, 1:51 PM ESTWinter Weather AdvisoryILN20 hr
Feb 15, 2:42 PM ESTWinter Weather AdvisoryILN33 hr
Feb 19, 2:50 PM ESTWinter Weather AdvisoryILN13 hr
Feb 27, 2:14 PM ESTWind AdvisoryILN29 hr
Feb 27, 4:19 PM ESTMesoscale DiscussionSPC2 hr
Mar 4, 1:46 PM ESTWind AdvisoryILN15 hr
Mar 5, 9:29 AM ESTSpecial Weather StatementILN31 min
Mar 14, 3:47 AM EDTWind AdvisoryILN50 hr
Mar 15, 2:09 AM EDTMesoscale DiscussionSPC96 min
Mar 15, 2:36 AM EDTTornado WatchSPC6 hr
Mar 15, 6:39 AM EDTSevere Thunderstorm WarningILN36 min
Mar 15, 3:48 PM EDTMesoscale DiscussionSPC87 min
Mar 19, 1:42 PM EDTWind AdvisoryILN11 hr
Mar 19, 6:55 PM EDTSevere Thunderstorm WatchSPC5 hr
Mar 30, 5:23 PM EDTSevere Thunderstorm WatchSPC5 hr
Mar 30, 6:11 PM EDTSpecial Weather StatementILN49 min
Mar 31, 3:08 PM EDTFlood WatchILN6 days
Apr 1, 2:45 PM EDTWind AdvisoryILN29 hr
Apr 2, 8:39 AM EDTSpecial Weather StatementILN51 min
Apr 2, 9:02 AM EDTSevere Thunderstorm WarningILN43 min
Apr 2, 9:31 AM EDTMesoscale DiscussionSPC119 min
Apr 2, 8:45 PM EDTMesoscale DiscussionSPC2 hr
Apr 2, 9:13 PM EDTTornado WatchSPC7 hr
Apr 2, 10:18 PM EDTSevere Thunderstorm Warning Considerable damage threatILN57 min
Apr 2, 10:46 PM EDTMesoscale DiscussionSPC89 min
Apr 6, 3:30 PM EDTFreeze WatchILN12 hr
Apr 7, 3:06 AM EDTFreeze WarningILN31 hr
Apr 8, 3:19 AM EDTFreeze WatchILN7 hr
Apr 8, 10:23 AM EDTFreeze WarningILN23 hr
Apr 11, 2:57 AM EDTFreeze WarningILN30 hr
Apr 16, 3:43 AM EDTFrost AdvisoryILN29 hr
Apr 19, 6:25 AM EDTSevere Thunderstorm WarningILN35 min
Apr 19, 6:31 AM EDTSevere Thunderstorm WarningILN29 min
Apr 29, 12:01 PM EDTMesoscale DiscussionSPC89 min
May 1, 8:06 PM EDTSpecial Weather StatementILN24 min
May 16, 7:17 PM EDTTornado WatchSPC7 hr
May 16, 8:01 PM EDTSpecial Weather StatementILN44 min
May 16, 8:13 PM EDTSevere Thunderstorm WarningILN47 min
Jun 18, 3:38 PM EDTMesoscale DiscussionSPC2 hr
Jun 18, 4:51 PM EDTSevere Thunderstorm WatchSPC6 hr
Jun 18, 5:46 PM EDTSevere Thunderstorm Warning Considerable damage threatILN44 min
Jun 18, 6:13 PM EDTSevere Thunderstorm WarningILN47 min
Jun 18, 6:24 PM EDTMesoscale DiscussionSPC96 min
Jun 20, 3:15 AM EDTExtreme Heat WatchILN23 hr
Jun 21, 2:21 AM EDTHeat AdvisoryILN7 days
Jun 25, 2:22 PM EDTMesoscale DiscussionSPC113 min
Jun 26, 2:07 PM EDTMesoscale DiscussionSPC113 min
Jun 26, 3:28 PM EDTSpecial Weather StatementILN47 min
Jul 12, 12:42 PM EDTMesoscale DiscussionSPC3 hr
Jul 12, 3:38 PM EDTSpecial Weather StatementILN37 min
Jul 16, 7:43 PM EDTMesoscale DiscussionSPC92 min
Jul 23, 12:05 AM EDTHeat AdvisoryILN68 hr
Jul 24, 9:54 PM EDTSpecial Weather StatementILN36 min
Jul 25, 6:39 AM EDTAreal Flood AdvisoryILN2 hr
Jul 26, 3:54 PM EDTSpecial Weather StatementILN36 min
Jul 26, 5:34 PM EDTMesoscale DiscussionSPC116 min
Jul 26, 8:12 PM EDTSevere Thunderstorm WarningILN33 min
Jul 27, 1:04 AM EDTHeat AdvisoryILN4 days
Jul 27, 1:10 PM EDTAreal Flood AdvisoryILN3 hr
Jul 27, 9:30 PM EDTAreal Flood AdvisoryILN3 hr
Jul 28, 6:21 PM EDTSpecial Weather StatementILN24 min
Aug 19, 2:15 PM EDTMesoscale DiscussionSPC90 min
Sep 22, 11:43 PM EDTDense Fog AdvisoryILN10 hr
Sep 25, 11:40 PM EDTDense Fog AdvisoryILN10 hr
Oct 9, 1:05 PM EDTFrost AdvisoryILN20 hr
Oct 18, 10:13 PM EDTWind AdvisoryILN13 hr
Oct 22, 11:53 AM EDTFreeze WatchILN13 hr
Oct 23, 1:03 AM EDTFreeze WarningILN32 hr
Oct 24, 1:33 PM EDTFreeze WarningILN20 hr
Nov 25, 10:23 AM ESTWind AdvisoryILN36 hr
Nov 27, 1:56 PM ESTWinter Storm WatchILN23 hr
Nov 28, 12:28 PM ESTWinter Weather AdvisoryILN36 hr
Nov 30, 11:58 PM ESTWinter Weather AdvisoryILN34 hr
Dec 12, 12:51 PM ESTWinter Weather AdvisoryILN40 hr
Dec 13, 12:36 AM ESTCold Weather AdvisoryILN58 hr
Dec 18, 11:35 AM ESTWind AdvisoryILN10 hr
Dec 24, 2:01 AM ESTDense Fog AdvisoryILN7 hr
Dec 25, 4:30 AM ESTDense Fog AdvisoryILN5 hr
Dec 28, 12:51 AM ESTWind AdvisoryILN41 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 archive20242026

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.