Alert archive / Illinois / Mercer County

Weather alerts in Mercer County, Illinois, 2022

114 weather alerts in 2022, 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 2022. Tap one for its archive.

Alerts
114
Warnings
31
Watches
9
Advisories
36
Busiest month
August22 alerts
Busiest day
August 20, 20229 alerts

Over time

By month

Warning verification

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

2 of 3 tornado warnings covering Mercer County in 2022 had a tornado report inside them; 4 of 5 tornado reports fell inside a warning, on average 25 minutes after it went out.

Mercer County, 2022

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings3233%580%25 min
Severe thunderstorm warnings17571%4100%16 min
Flash flood warnings00

Each office's whole area, 2022

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Quad Cities, IA: tornado warnings301163%1974%16 min
NWS Quad Cities, IA: severe thunderstorm warnings1759148%23578%19 min
NWS Quad Cities, IA: flash flood warnings261350%2677%99 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, Central Time. Each opens its own page with the text, the map, the radar and the sounding.

IssuedProductOfficeLasted
Jan 1, 2:27 PM CSTMesoscale DiscussionSPC4 hr
Jan 4, 3:08 AM CSTWinter Weather AdvisoryDVN39 hr
Jan 6, 2:02 AM CSTWind Chill AdvisoryDVN31 hr
Jan 7, 2:05 PM CSTWinter Weather AdvisoryDVN34 hr
Jan 13, 2:47 PM CSTWinter Weather AdvisoryDVN44 hr
Jan 16, 8:26 AM CSTDense Fog AdvisoryDVN97 min
Jan 19, 2:13 AM CSTWind Chill AdvisoryDVN34 hr
Jan 25, 3:27 AM CSTWind Chill AdvisoryDVN30 hr
Feb 1, 2:54 AM CSTWinter Weather AdvisoryDVN39 hr
Feb 15, 3:06 PM CSTWinter Storm WatchDVN12 hr
Feb 16, 3:30 AM CSTWinter Weather AdvisoryDVN39 hr
Feb 18, 8:38 PM CSTSnow Squall WarningDVN52 min
Feb 18, 9:31 PM CSTSnow Squall WarningDVN59 min
Feb 18, 9:37 PM CSTSpecial Weather StatementDVN53 min
Feb 23, 2:55 PM CSTWinter Weather AdvisoryDVN36 hr
Mar 5, 3:27 AM CSTWind AdvisoryDVN27 hr
Mar 5, 6:10 PM CSTTornado WatchSPC4 hr
Mar 5, 7:51 PM CSTMesoscale DiscussionSPC114 min
Mar 5, 8:02 PM CSTSevere Thunderstorm WarningDVN43 min
Mar 5, 8:26 PM CSTSevere Thunderstorm WarningDVN49 min
Mar 5, 8:44 PM CSTTornado WarningDVN17 min
Mar 6, 3:05 PM CSTWinter Weather AdvisoryDVN21 hr
Mar 25, 3:10 AM CDTWind AdvisoryDVN19 hr
Apr 13, 2:26 PM CDTWind AdvisoryDVN29 hr
Apr 22, 10:46 AM CDTRiver Flood WatchDVN6 days
Apr 23, 10:40 AM CDTRiver Flood WarningDVN3 days
Apr 25, 3:02 AM CDTFreeze WarningDVN29 hr
Apr 26, 2:39 PM CDTFrost AdvisoryDVN17 hr
Apr 30, 12:32 PM CDTMesoscale DiscussionSPC118 min
May 11, 10:08 AM CDTHeat AdvisoryDVN11 hr
May 12, 2:48 AM CDTHeat AdvisoryDVN17 hr
May 13, 4:27 PM CDTSpecial Weather StatementDVN33 min
May 13, 4:34 PM CDTSevere Thunderstorm WarningDVN41 min
May 13, 4:36 PM CDTSevere Thunderstorm WarningDVN24 min
May 13, 4:54 PM CDTSevere Thunderstorm WarningDVN19 min
May 20, 7:10 PM CDTMesoscale DiscussionSPC2 hr
May 25, 6:46 PM CDTMesoscale DiscussionSPC119 min
May 25, 8:07 PM CDTSpecial Weather StatementDVN38 min
May 26, 12:34 PM CDTSevere Thunderstorm WarningDVN41 min
May 31, 6:22 PM CDTMesoscale DiscussionSPC83 min
Jun 6, 3:45 PM CDTMesoscale DiscussionSPC2 hr
Jun 8, 10:42 AM CDTSpecial Weather StatementDVN63 min
Jun 12, 2:40 PM CDTHeat AdvisoryDVN3 days
Jun 14, 2:58 AM CDTExcessive Heat WarningDVN41 hr
Jun 15, 6:21 PM CDTSevere Thunderstorm WatchSPC6 hr
Jun 15, 7:53 PM CDTMesoscale DiscussionSPC97 min
Jun 15, 11:58 PM CDTSpecial Weather StatementDVN32 min
Jun 20, 2:16 PM CDTHeat AdvisoryDVN29 hr
Jun 25, 4:43 AM CDTSpecial Weather StatementDVN62 min
Jun 25, 5:44 AM CDTSpecial Weather StatementDVN76 min
Jun 25, 6:23 AM CDTSevere Thunderstorm WarningDVN52 min
Jun 25, 2:17 PM CDTMesoscale DiscussionSPC118 min
Jun 25, 5:02 PM CDTSevere Thunderstorm WatchSPC7 hr
Jun 25, 6:21 PM CDTSevere Thunderstorm WarningDVN39 min
Jun 25, 7:00 PM CDTSpecial Weather StatementDVN30 min
Jun 25, 7:16 PM CDTMesoscale DiscussionSPC89 min
Jul 4, 3:30 AM CDTHeat AdvisoryDVN34 hr
Jul 5, 1:09 PM CDTExcessive Heat WarningDVN7 hr
Jul 5, 10:24 PM CDTMesoscale DiscussionSPC96 min
Jul 5, 10:31 PM CDTSevere Thunderstorm WarningDVN59 min
Jul 8, 1:13 PM CDTSpecial Weather StatementDVN62 min
Jul 8, 3:13 PM CDTSpecial Weather StatementDVN32 min
Jul 11, 7:29 AM CDTMesoscale DiscussionSPC61 min
Jul 15, 2:07 AM CDTSpecial Weather StatementDVN38 min
Jul 22, 3:26 AM CDTHeat AdvisoryDVN41 hr
Jul 22, 10:22 PM CDTMesoscale DiscussionSPC113 min
Jul 23, 2:05 AM CDTMesoscale DiscussionSPC2 hr
Aug 1, 2:12 AM CDTSevere Thunderstorm WarningDVN33 min
Aug 1, 2:49 AM CDTSpecial Weather StatementDVN41 min
Aug 1, 3:16 AM CDTSevere Thunderstorm WarningDVN44 min
Aug 2, 2:44 AM CDTHeat AdvisoryDVN17 hr
Aug 2, 5:36 AM CDTSpecial Weather StatementDVN39 min
Aug 3, 9:13 AM CDTSpecial Weather StatementDVN32 min
Aug 3, 12:20 PM CDTSpecial Weather StatementDVN25 min
Aug 5, 2:46 AM CDTHeat AdvisoryDVN42 hr
Aug 6, 12:22 PM CDTExcessive Heat WarningDVN9 hr
Aug 19, 7:12 PM CDTSevere Thunderstorm WarningDVN48 min
Aug 19, 8:31 PM CDTSevere Thunderstorm WarningDVN29 min
Aug 19, 8:58 PM CDTSpecial Weather StatementDVN62 min
Aug 19, 9:19 PM CDTSevere Thunderstorm WarningDVN41 min
Aug 20, 12:51 PM CDTMesoscale DiscussionSPC2 hr
Aug 20, 1:35 PM CDTTornado WarningDVN40 min
Aug 20, 1:56 PM CDTTornado WarningDVN30 min
Aug 20, 2:30 PM CDTSevere Thunderstorm WarningDVN45 min
Aug 20, 4:33 PM CDTSpecial Weather StatementDVN117 min
Aug 21, 1:27 AM CDTDense Fog AdvisoryDVN7 hr
Aug 29, 9:42 AM CDTMesoscale DiscussionSPC2 hr
Aug 29, 10:12 AM CDTSevere Thunderstorm WatchSPC5 hr
Aug 29, 10:13 AM CDTSevere Thunderstorm WarningDVN34 min
Sep 6, 2:31 AM CDTDense Fog AdvisoryDVN6 hr
Sep 18, 6:11 PM CDTTornado WatchSPC6 hr
Sep 18, 8:41 PM CDTMesoscale DiscussionSPC3 hr
Sep 27, 1:53 PM CDTFrost AdvisoryDVN18 hr
Sep 28, 3:00 PM CDTFrost AdvisoryDVN16 hr
Oct 6, 2:32 PM CDTFreeze WatchDVN12 hr
Oct 7, 2:19 AM CDTFreeze WarningDVN31 hr
Oct 13, 2:52 AM CDTRed Flag WarningDVN16 hr
Oct 22, 10:31 AM CDTRed Flag WarningDVN8 hr
Oct 24, 8:56 PM CDTSpecial Weather StatementDVN49 min
Nov 4, 2:51 AM CDTWind AdvisoryDVN40 hr
Nov 4, 2:05 PM CDTMesoscale DiscussionSPC115 min
Nov 4, 3:42 PM CDTSpecial Weather StatementDVN78 min
Nov 5, 8:01 AM CDTSevere Thunderstorm WarningDVN29 min
Nov 14, 2:24 PM CSTWinter Weather AdvisoryDVN30 hr
Dec 2, 2:52 AM CSTWind AdvisoryDVN26 hr
Dec 7, 3:36 AM CSTDense Fog AdvisoryDVN8 hr
Dec 9, 9:31 PM CSTDense Fog AdvisoryDVN14 hr
Dec 12, 2:25 PM CSTWind AdvisoryDVN31 hr
Dec 19, 2:42 PM CSTWinter Storm WatchDVN37 hr
Dec 20, 2:34 PM CSTWinter Storm WarningDVN4 days
Dec 22, 10:59 AM CSTMesoscale DiscussionSPC4 hr
Dec 24, 3:10 AM CSTWinter Weather AdvisoryDVN9 hr
Dec 24, 2:01 PM CSTWind Chill AdvisoryDVN20 hr
Dec 25, 12:16 PM CSTWinter Weather AdvisoryDVN24 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 archive20212023

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.