Alert archive / Illinois / Clay County

Weather alerts in Clay County, Illinois, 2012

140 weather alerts in 2012, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Clay County and its neighbors

Each county as a circle sized by its count in 2012. Tap one for its archive.

Alerts
140
Warnings
37
Watches
18
Advisories
29
Busiest month
September24 alerts
Busiest day
March 2, 20127 alerts

Over time

By month

Warning verification

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

0 of 4 tornado warnings covering Clay County in 2012 had a tornado report inside them.

Clay County, 2012

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings40100%0
Severe thunderstorm warnings14843%1669%21 min
Flash flood warnings10100%0

Each office's whole area, 2012

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Lincoln, IL: tornado warnings24675%1580%23 min
NWS Lincoln, IL: severe thunderstorm warnings1325856%17766%19 min
NWS Lincoln, IL: flash flood warnings7186%2100%36 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 11, 10:59 AM CSTWinter Weather AdvisoryILX40 hr
Jan 17, 1:50 AM CSTMesoscale DiscussionSPC85 min
Jan 17, 6:25 AM CSTMesoscale DiscussionSPC65 min
Jan 17, 1:58 PM CSTRiver Flood WarningILX4 days
Jan 20, 3:50 AM CSTWinter Weather AdvisoryILX24 hr
Jan 20, 5:32 PM CSTMesoscale DiscussionSPC5 hr
Jan 22, 5:37 PM CSTMesoscale DiscussionSPC113 min
Jan 22, 8:25 PM CSTMesoscale DiscussionSPC2 hr
Jan 22, 9:46 PM CSTSpecial Weather StatementILX29 min
Jan 23, 4:18 AM CSTRiver Flood WarningILX10 days
Feb 2, 12:07 AM CSTDense Fog AdvisoryILX12 hr
Feb 5, 6:04 AM CSTRiver Flood WarningILX69 hr
Feb 6, 2:45 AM CSTDense Fog AdvisoryILX9 hr
Feb 29, 12:49 AM CSTMesoscale DiscussionSPC56 min
Feb 29, 1:14 AM CSTTornado WatchSPC11 hr
Feb 29, 3:53 AM CSTMesoscale DiscussionSPC97 min
Mar 2, 3:41 AM CSTWind AdvisoryILX16 hr
Mar 2, 4:25 AM CSTMesoscale DiscussionSPC95 min
Mar 2, 5:52 AM CSTSevere Thunderstorm WatchSPC6 hr
Mar 2, 7:50 AM CSTMesoscale DiscussionSPC85 min
Mar 2, 9:54 AM CSTTornado Watch PDSSPC6 hr
Mar 2, 11:22 AM CSTSevere Thunderstorm WarningILX26 min
Mar 2, 12:05 PM CSTSevere Thunderstorm WarningILX40 min
Mar 7, 3:45 AM CSTWind AdvisoryILX14 hr
Mar 15, 1:08 PM CDTMesoscale DiscussionSPC2 hr
Mar 18, 1:41 AM CDTMesoscale DiscussionSPC94 min
Mar 23, 9:46 AM CDTMesoscale DiscussionSPC119 min
Mar 23, 11:44 AM CDTSevere Thunderstorm WatchSPC7 hr
Mar 23, 1:28 PM CDTMesoscale DiscussionSPC62 min
Mar 23, 2:08 PM CDTTornado WarningILX27 min
Mar 23, 2:28 PM CDTTornado WarningILX30 min
Mar 23, 2:53 PM CDTTornado WarningILX24 min
Mar 30, 1:12 PM CDTMesoscale DiscussionSPC93 min
Mar 30, 2:51 PM CDTSevere Thunderstorm WatchSPC7 hr
Mar 30, 3:24 PM CDTSevere Thunderstorm WarningILX54 min
Mar 30, 5:09 PM CDTSpecial Weather StatementILX66 min
Mar 30, 7:26 PM CDTMesoscale DiscussionSPC64 min
Apr 9, 3:54 AM CDTRed Flag WarningILX15 hr
Apr 9, 3:10 PM CDTFreeze WatchILX13 hr
Apr 10, 3:44 AM CDTFreeze WarningILX28 hr
Apr 11, 3:46 AM CDTFreeze WarningILX28 hr
Apr 15, 3:10 AM CDTWind AdvisoryILX18 hr
Apr 25, 4:36 PM CDTMesoscale DiscussionSPC84 min
Apr 25, 7:47 PM CDTSevere Thunderstorm WatchSPC6 hr
Apr 25, 10:11 PM CDTMesoscale DiscussionSPC2 hr
Apr 25, 11:55 PM CDTSevere Thunderstorm WarningILX65 min
Apr 26, 2:38 AM CDTSpecial Weather StatementILX37 min
Apr 28, 1:17 PM CDTMesoscale DiscussionSPC88 min
Apr 28, 1:48 PM CDTSevere Thunderstorm WatchSPC7 hr
Apr 28, 2:56 PM CDTMesoscale DiscussionSPC64 min
Apr 28, 5:59 PM CDTMesoscale DiscussionSPC2 hr
Apr 28, 6:45 PM CDTSevere Thunderstorm WarningILX60 min
Apr 28, 7:23 PM CDTSevere Thunderstorm WarningILX52 min
Apr 30, 12:03 PM CDTMesoscale DiscussionSPC117 min
May 1, 5:31 AM CDTDense Fog AdvisoryILX3 hr
May 2, 8:49 AM CDTRiver Flood WarningILX44 hr
May 4, 8:47 AM CDTSevere Thunderstorm WarningILX43 min
May 4, 11:36 AM CDTMesoscale DiscussionSPC84 min
May 4, 7:57 PM CDTMesoscale DiscussionSPC63 min
May 5, 1:36 AM CDTSpecial Weather StatementILX54 min
May 5, 1:54 AM CDTSevere Thunderstorm WarningILX38 min
May 5, 9:23 AM CDTRiver Flood WarningILX4 days
Jun 2, 1:05 PM CDTMesoscale DiscussionSPC115 min
Jun 11, 11:23 AM CDTMesoscale DiscussionSPC97 min
Jun 16, 8:23 PM CDTSevere Thunderstorm WatchSPC3 hr
Jun 16, 10:30 PM CDTMesoscale DiscussionSPC90 min
Jun 27, 3:04 AM CDTHeat AdvisoryILX60 hr
Jun 27, 3:17 PM CDTRed Flag WarningILX28 hr
Jun 29, 2:45 PM CDTExcessive Heat WarningILX8 days
Jun 30, 5:55 PM CDTMesoscale DiscussionSPC3 hr
Jul 2, 5:16 PM CDTMesoscale DiscussionSPC2 hr
Jul 16, 3:24 PM CDTHeat AdvisoryILX3 days
Jul 22, 2:55 PM CDTHeat AdvisoryILX3 days
Jul 24, 3:25 PM CDTMesoscale DiscussionSPC95 min
Jul 26, 3:24 AM CDTHeat AdvisoryILX14 hr
Jul 26, 1:25 PM CDTMesoscale DiscussionSPC65 min
Jul 26, 1:46 PM CDTSevere Thunderstorm WatchSPC10 hr
Jul 26, 3:55 PM CDTMesoscale DiscussionSPC35 min
Jul 27, 12:52 PM CDTMesoscale DiscussionSPC2 hr
Jul 31, 12:11 PM CDTMesoscale DiscussionSPC64 min
Jul 31, 1:13 PM CDTSevere Thunderstorm WatchSPC6 hr
Jul 31, 3:35 PM CDTMesoscale DiscussionSPC55 min
Aug 3, 2:32 PM CDTHeat AdvisoryILX25 hr
Aug 8, 5:22 PM CDTSevere Thunderstorm WarningILX38 min
Aug 8, 5:32 PM CDTAreal Flood AdvisoryILX3 hr
Aug 8, 6:14 PM CDTFlash Flood WarningILX3 hr
Aug 9, 7:40 PM CDTSevere Thunderstorm WatchSPC4 hr
Aug 16, 12:47 PM CDTMesoscale DiscussionSPC88 min
Aug 16, 1:05 PM CDTSevere Thunderstorm WatchSPC7 hr
Aug 16, 3:07 PM CDTMesoscale DiscussionSPC83 min
Aug 16, 3:59 PM CDTTornado WarningILX46 min
Aug 16, 4:29 PM CDTSevere Thunderstorm WarningILX61 min
Aug 16, 5:25 PM CDTMesoscale DiscussionSPC2 hr
Aug 31, 3:53 PM CDTTornado WatchSPC5 hr
Aug 31, 6:01 PM CDTMesoscale DiscussionSPC89 min
Aug 31, 9:05 PM CDTMesoscale DiscussionSPC55 min
Sep 1, 12:41 PM CDTMesoscale DiscussionSPC64 min
Sep 1, 12:46 PM CDTTornado WatchSPC7 hr
Sep 1, 3:30 PM CDTMesoscale DiscussionSPC60 min
Sep 2, 9:13 AM CDTRiver Flood WarningILX3 days
Sep 5, 9:04 AM CDTMesoscale DiscussionSPC86 min
Sep 5, 9:37 AM CDTSevere Thunderstorm WatchSPC6 hr
Sep 5, 9:52 AM CDTSevere Thunderstorm WarningILX38 min
Sep 5, 10:31 AM CDTSevere Thunderstorm WarningILX59 min
Sep 6, 4:45 AM CDTDense Fog AdvisoryILX4 hr
Sep 7, 3:41 PM CDTSevere Thunderstorm WatchSPC6 hr
Sep 7, 6:29 PM CDTSevere Thunderstorm WarningILX61 min
Sep 7, 7:29 PM CDTSevere Thunderstorm WarningILX46 min
Sep 7, 7:39 PM CDTMesoscale DiscussionSPC66 min
Sep 7, 8:13 PM CDTAreal Flood AdvisoryILX3 hr
Sep 8, 5:45 AM CDTRiver Flood WarningILX58 hr
Sep 21, 1:36 PM CDTMesoscale DiscussionSPC84 min
Sep 21, 4:59 PM CDTMesoscale DiscussionSPC91 min
Sep 21, 6:30 PM CDTMesoscale DiscussionSPC3 hr
Sep 23, 3:41 PM CDTFrost AdvisoryILX16 hr
Sep 25, 12:51 AM CDTMesoscale DiscussionSPC114 min
Sep 25, 12:59 PM CDTMesoscale DiscussionSPC61 min
Sep 26, 8:54 AM CDTAreal Flood AdvisoryILX6 hr
Sep 26, 9:30 AM CDTRiver Flood WarningILX33 hr
Oct 7, 3:25 PM CDTFrost AdvisoryILX17 hr
Oct 13, 3:02 PM CDTWind AdvisoryILX28 hr
Oct 17, 11:45 AM CDTMesoscale DiscussionSPC90 min
Oct 17, 6:19 PM CDTMesoscale DiscussionSPC56 min
Oct 31, 4:18 AM CDTFreeze WarningILX28 hr
Nov 8, 4:28 AM CSTDense Fog AdvisoryILX4 hr
Nov 11, 3:25 AM CSTWind AdvisoryILX15 hr
Nov 20, 5:52 PM CSTDense Fog AdvisoryILX20 hr
Nov 21, 10:54 PM CSTDense Fog AdvisoryILX9 hr
Dec 7, 4:41 AM CSTDense Fog AdvisoryILX4 hr
Dec 19, 3:57 PM CSTHigh Wind WarningILX32 hr
Dec 20, 11:56 PM CSTWind AdvisoryILX6 hr
Dec 22, 8:08 AM CSTRiver Flood WarningILX20 hr
Dec 23, 2:48 PM CSTWinter Storm WatchILX37 hr
Dec 25, 3:41 AM CSTWinter Storm WarningILX9 hr
Dec 25, 12:19 PM CSTBlizzard WarningILX22 hr
Dec 26, 2:25 AM CSTMesoscale DiscussionSPC6 hr
Dec 28, 1:51 PM CSTWinter Weather AdvisoryILX16 hr
Dec 28, 3:44 PM CSTMesoscale DiscussionSPC6 hr
Dec 30, 4:50 AM CSTDense Fog AdvisoryILX4 hr
Dec 31, 3:04 AM CSTWinter Weather AdvisoryILX27 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 archive20112013

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.