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

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings2150%0
Severe thunderstorm warnings131023%475%38 min
Flash flood warnings220%1100%37 min

Each office's whole area, 2010

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Wilmington, OH: tornado warnings421369%2186%16 min
NWS Wilmington, OH: severe thunderstorm warnings26819926%46085%23 min
NWS Wilmington, OH: flash flood warnings452936%6686%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.

IssuedProductOfficeLasted
Jan 3, 4:00 AM ESTWind Chill AdvisoryILN8 hr
Jan 6, 4:00 PM ESTWinter Weather AdvisoryILN48 hr
Jan 15, 11:23 PM ESTFreezing Fog AdvisoryILN10 hr
Jan 16, 7:09 PM ESTDense Fog AdvisoryILN11 hr
Jan 17, 5:55 PM ESTDense Fog AdvisoryILN9 hr
Feb 4, 3:11 PM ESTWinter Storm WarningILN49 hr
Feb 7, 4:39 PM ESTWinter Storm WatchILN24 hr
Feb 8, 4:05 PM ESTWinter Storm WarningILN48 hr
Feb 14, 2:47 PM ESTWinter Weather AdvisoryILN49 hr
Feb 22, 10:23 AM ESTDense Fog AdvisoryILN6 hr
Feb 26, 3:50 AM ESTWinter Weather AdvisoryILN26 hr
Apr 2, 5:08 AM EDTFire Weather WatchILN6 hr
Apr 2, 11:31 AM EDTRed Flag WarningILN8 hr
Apr 16, 1:28 PM EDTSevere Thunderstorm WatchSPC7 hr
Apr 27, 3:46 AM EDTFreeze WatchILN12 hr
Apr 27, 3:57 PM EDTFreeze WarningILN17 hr
May 3, 6:12 PM EDTMesoscale DiscussionSPC93 min
May 3, 7:34 PM EDTSevere Thunderstorm WarningILN41 min
May 5, 2:52 PM EDTMesoscale DiscussionSPC113 min
May 5, 3:48 PM EDTSevere Thunderstorm WatchSPC6 hr
May 5, 7:09 PM EDTMesoscale DiscussionSPC96 min
May 5, 9:42 PM EDTMesoscale DiscussionSPC63 min
May 7, 2:59 PM EDTMesoscale DiscussionSPC91 min
May 7, 3:30 PM EDTTornado WatchSPC9 hr
May 7, 7:25 PM EDTMesoscale DiscussionSPC95 min
May 8, 11:23 AM EDTWind AdvisoryILN6 hr
May 9, 3:51 AM EDTFrost AdvisoryILN29 hr
May 11, 7:17 PM EDTMesoscale DiscussionSPC88 min
May 13, 12:02 PM EDTMesoscale DiscussionSPC118 min
May 13, 1:46 PM EDTTornado WatchSPC6 hr
May 13, 4:02 PM EDTMesoscale DiscussionSPC88 min
May 14, 1:48 AM EDTMesoscale DiscussionSPC87 min
May 21, 11:26 AM EDTMesoscale DiscussionSPC64 min
May 21, 7:27 PM EDTAreal Flood AdvisoryILN3 hr
May 21, 10:42 PM EDTAreal Flood AdvisoryILN3 hr
May 22, 1:48 AM EDTAreal Flood AdvisoryILN5 hr
May 27, 2:26 PM EDTSpecial Weather StatementILN64 min
May 27, 5:43 PM EDTSpecial Weather StatementILN62 min
May 27, 6:17 PM EDTAreal Flood AdvisoryILN118 min
May 27, 8:18 PM EDTAreal Flood AdvisoryILN117 min
May 31, 1:57 PM EDTAreal Flood AdvisoryILN3 hr
May 31, 6:10 PM EDTAreal Flood AdvisoryILN3 hr
Jun 2, 7:57 AM EDTSpecial Weather StatementILN63 min
Jun 4, 12:15 PM EDTMesoscale DiscussionSPC60 min
Jun 4, 1:14 PM EDTSevere Thunderstorm WatchSPC9 hr
Jun 4, 3:45 PM EDTMesoscale DiscussionSPC60 min
Jun 4, 9:56 PM EDTSpecial Weather StatementILN64 min
Jun 4, 10:10 PM EDTSevere Thunderstorm WarningILN50 min
Jun 4, 10:52 PM EDTSevere Thunderstorm WarningILN38 min
Jun 4, 10:53 PM EDTMesoscale DiscussionSPC67 min
Jun 5, 4:07 AM EDTFlash Flood WatchILN28 hr
Jun 5, 8:51 AM EDTMesoscale DiscussionSPC114 min
Jun 5, 1:35 PM EDTMesoscale DiscussionSPC85 min
Jun 5, 2:08 PM EDTSevere Thunderstorm WatchSPC6 hr
Jun 5, 9:47 PM EDTMesoscale DiscussionSPC58 min
Jun 5, 10:11 PM EDTTornado WatchSPC7 hr
Jun 6, 12:17 AM EDTMesoscale DiscussionSPC118 min
Jun 6, 2:03 AM EDTTornado WatchSPC7 hr
Jun 6, 3:05 AM EDTSpecial Weather StatementILN55 min
Jun 6, 3:38 AM EDTSevere Thunderstorm WarningILN37 min
Jun 6, 3:38 AM EDTMesoscale DiscussionSPC2 hr
Jun 11, 1:38 PM EDTMesoscale DiscussionSPC2 hr
Jun 12, 5:47 PM EDTMesoscale DiscussionSPC88 min
Jun 12, 8:34 PM EDTMesoscale DiscussionSPC26 min
Jun 12, 8:38 PM EDTSevere Thunderstorm WatchSPC3 hr
Jun 12, 10:01 PM EDTAreal Flood AdvisoryILN2 hr
Jun 14, 12:20 PM EDTFlash Flood WatchILN40 hr
Jun 14, 2:45 PM EDTMesoscale DiscussionSPC60 min
Jun 14, 9:26 PM EDTAreal Flood AdvisoryILN3 hr
Jun 14, 9:47 PM EDTFlash Flood WarningILN3 hr
Jun 14, 10:24 PM EDTSevere Thunderstorm WarningILN51 min
Jun 15, 12:43 AM EDTAreal Flood WarningILN3 hr
Jun 15, 5:47 PM EDTSevere Thunderstorm WatchSPC6 hr
Jun 15, 6:58 PM EDTMesoscale DiscussionSPC62 min
Jun 15, 8:41 PM EDTMesoscale DiscussionSPC64 min
Jun 15, 9:26 PM EDTSpecial Weather StatementILN79 min
Jun 18, 6:30 PM EDTSevere Thunderstorm WatchSPC6 hr
Jun 18, 7:56 PM EDTMesoscale DiscussionSPC94 min
Jun 18, 8:26 PM EDTSpecial Weather StatementILN64 min
Jun 18, 8:51 PM EDTSevere Thunderstorm WarningILN54 min
Jun 22, 3:27 AM EDTMesoscale DiscussionSPC93 min
Jun 23, 11:52 AM EDTMesoscale DiscussionSPC53 min
Jun 23, 10:43 PM EDTSevere Thunderstorm WatchSPC4 hr
Jun 23, 10:57 PM EDTSevere Thunderstorm WarningILN48 min
Jun 24, 12:13 AM EDTMesoscale DiscussionSPC62 min
Jun 27, 11:02 AM EDTMesoscale DiscussionSPC118 min
Jun 27, 11:38 AM EDTSevere Thunderstorm WatchSPC7 hr
Jun 27, 2:43 PM EDTMesoscale DiscussionSPC2 hr
Jun 27, 6:53 PM EDTSpecial Weather StatementILN67 min
Jun 27, 7:37 PM EDTSevere Thunderstorm WarningILN53 min
Jun 27, 7:53 PM EDTAreal Flood AdvisoryILN3 hr
Jul 15, 11:08 AM EDTHeat AdvisoryILN7 hr
Jul 15, 3:47 PM EDTMesoscale DiscussionSPC118 min
Jul 15, 6:56 PM EDTMesoscale DiscussionSPC94 min
Jul 18, 6:24 PM EDTAreal Flood AdvisoryILN3 hr
Jul 22, 3:53 PM EDTHeat AdvisoryILN28 hr
Jul 23, 10:45 PM EDTMesoscale DiscussionSPC90 min
Jul 24, 4:05 AM EDTHeat AdvisoryILN16 hr
Jul 24, 4:37 PM EDTMesoscale DiscussionSPC83 min
Jul 24, 6:10 PM EDTSevere Thunderstorm WatchSPC4 hr
Jul 24, 8:17 PM EDTAreal Flood AdvisoryILN3 hr
Jul 24, 8:43 PM EDTFlash Flood WarningILN6 hr
Jul 24, 9:36 PM EDTMesoscale DiscussionSPC54 min
Jul 25, 4:41 AM EDTAreal Flood AdvisoryILN109 min
Jul 28, 6:18 PM EDTSpecial Weather StatementILN57 min
Jul 28, 6:43 PM EDTSevere Thunderstorm WarningILN41 min
Aug 4, 10:11 AM EDTMesoscale DiscussionSPC34 min
Aug 4, 10:37 AM EDTSevere Thunderstorm WatchSPC5 hr
Aug 4, 11:35 AM EDTSevere Thunderstorm WarningILN55 min
Aug 4, 12:15 PM EDTSevere Thunderstorm WarningILN45 min
Aug 4, 6:25 PM EDTMesoscale DiscussionSPC65 min
Aug 4, 7:02 PM EDTSevere Thunderstorm WatchSPC7 hr
Aug 4, 7:44 PM EDTSpecial Weather StatementILN106 min
Aug 4, 8:50 PM EDTSevere Thunderstorm WarningILN55 min
Aug 4, 8:55 PM EDTMesoscale DiscussionSPC65 min
Aug 4, 9:35 PM EDTAreal Flood AdvisoryILN3 hr
Aug 5, 7:38 PM EDTMesoscale DiscussionSPC2 hr
Aug 10, 3:56 PM EDTHeat AdvisoryILN25 hr
Aug 15, 1:51 PM EDTSevere Thunderstorm WatchSPC7 hr
Aug 15, 4:19 PM EDTMesoscale DiscussionSPC86 min
Aug 15, 6:34 PM EDTMesoscale DiscussionSPC56 min
Sep 16, 1:35 PM EDTMesoscale DiscussionSPC85 min
Sep 16, 2:00 PM EDTSpecial Weather StatementILN60 min
Sep 16, 2:10 PM EDTSevere Thunderstorm WatchSPC5 hr
Sep 24, 12:13 PM EDTWind AdvisoryILN3 hr
Oct 5, 4:11 PM EDTFrost AdvisoryILN12 hr
Oct 13, 5:24 PM EDTSpecial Weather StatementILN66 min
Oct 15, 9:44 PM EDTFrost AdvisoryILN11 hr
Oct 19, 5:06 AM EDTDense Fog AdvisoryILN5 hr
Oct 21, 3:01 AM EDTFrost AdvisoryILN31 hr
Oct 25, 4:09 AM EDTHigh Wind WatchILN12 hr
Oct 25, 3:45 PM EDTWind AdvisoryILN12 hr
Oct 26, 3:56 AM EDTHigh Wind WarningILN9 hr
Oct 26, 7:00 AM EDTMesoscale DiscussionSPC2 hr
Oct 26, 8:55 AM EDTTornado WatchSPC7 hr
Oct 26, 10:50 AM EDTSevere Thunderstorm WarningILN55 min
Oct 26, 11:12 AM EDTTornado WarningILN33 min
Oct 26, 11:38 AM EDTTornado WarningILN37 min
Oct 26, 12:32 PM EDTWind AdvisoryILN3 hr
Oct 27, 3:49 AM EDTWind AdvisoryILN14 hr
Oct 28, 3:37 AM EDTFreeze WarningILN25 hr
Oct 29, 3:48 PM EDTFire Weather WatchILN12 hr
Oct 30, 4:04 AM EDTRed Flag WarningILN15 hr
Nov 21, 12:27 AM ESTDense Fog AdvisoryILN8 hr
Nov 22, 11:30 PM ESTSpecial Weather StatementILN45 min
Nov 24, 3:23 AM ESTFlood WatchILN46 hr
Nov 24, 12:35 PM ESTMesoscale DiscussionSPC5 hr
Dec 11, 3:03 PM ESTWinter Weather AdvisoryILN44 hr
Dec 29, 3:17 PM ESTWinter Weather AdvisoryILN12 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.