Alert archive / Illinois / Shelby County

Weather alerts in Shelby County, Illinois, 2017

96 weather alerts in 2017, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Shelby County and its neighbors

Each county as a circle sized by its count in 2017. Tap one for its archive.

Alerts
96
Warnings
21
Watches
17
Advisories
22
Busiest month
April19 alerts
Busiest day
April 29, 20177 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 1 tornado warnings covering Shelby County in 2017 had a tornado report inside them.

Shelby County, 2017

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings10100%0
Severe thunderstorm warnings12833%786%16 min
Flash flood warnings2150%0

Each office's whole area, 2017

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Lincoln, IL: tornado warnings23387%2129%11 min
NWS Lincoln, IL: severe thunderstorm warnings1689245%37875%19 min
NWS Lincoln, IL: flash flood warnings311068%2681%142 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 2, 4:59 PM CSTDense Fog AdvisoryILX15 hr
Jan 4, 2:58 PM CSTWinter Weather AdvisoryILX24 hr
Jan 10, 3:43 AM CSTWind AdvisoryILX17 hr
Jan 11, 11:53 AM CSTDense Fog AdvisoryILX9 hr
Jan 12, 4:13 AM CSTWinter Storm WatchILX59 hr
Jan 13, 4:17 AM CSTFreezing Rain AdvisoryILX56 hr
Jan 14, 2:14 AM CSTMesoscale DiscussionSPC6 hr
Jan 15, 10:45 PM CSTDense Fog AdvisoryILX13 hr
Jan 16, 12:04 PM CSTDense Fog AdvisoryILX17 hr
Jan 19, 3:08 PM CSTDense Fog AdvisoryILX19 hr
Feb 6, 11:20 PM CSTMesoscale DiscussionSPC115 min
Feb 19, 1:00 AM CSTDense Fog AdvisoryILX10 hr
Feb 19, 10:08 PM CSTDense Fog AdvisoryILX11 hr
Feb 21, 10:51 PM CSTDense Fog AdvisoryILX12 hr
Feb 23, 4:25 AM CSTDense Fog AdvisoryILX6 hr
Feb 28, 2:57 PM CSTTornado WatchSPC7 hr
Feb 28, 6:27 PM CSTSevere Thunderstorm WarningILX28 min
Feb 28, 9:51 PM CSTTornado WatchSPC6 hr
Mar 6, 10:35 PM CSTSevere Thunderstorm WatchSPC4 hr
Mar 6, 11:13 PM CSTMesoscale DiscussionSPC2 hr
Mar 7, 1:16 AM CSTSevere Thunderstorm WarningILX44 min
Mar 7, 1:53 AM CSTMesoscale DiscussionSPC97 min
Mar 7, 1:57 AM CSTSevere Thunderstorm WarningILX48 min
Mar 17, 6:53 AM CDTSevere Thunderstorm WarningILX37 min
Mar 30, 11:56 AM CDTMesoscale DiscussionSPC64 min
Mar 30, 12:31 PM CDTSevere Thunderstorm WatchSPC7 hr
Mar 30, 1:54 PM CDTSpecial Weather StatementILX51 min
Mar 30, 2:42 PM CDTSpecial Weather StatementILX48 min
Apr 10, 1:48 PM CDTSevere Thunderstorm WatchSPC8 hr
Apr 10, 1:51 PM CDTSpecial Weather StatementILX24 min
Apr 10, 3:25 PM CDTMesoscale DiscussionSPC2 hr
Apr 10, 6:22 PM CDTMesoscale DiscussionSPC53 min
Apr 10, 6:54 PM CDTSpecial Weather StatementILX21 min
Apr 10, 7:16 PM CDTSevere Thunderstorm WarningILX29 min
Apr 10, 8:58 PM CDTMesoscale DiscussionSPC62 min
Apr 27, 2:41 PM CDTFlash Flood WatchILX5 days
Apr 28, 1:10 PM CDTMesoscale DiscussionSPC2 hr
Apr 29, 3:57 PM CDTSevere Thunderstorm WatchSPC6 hr
Apr 29, 4:46 PM CDTSevere Thunderstorm WarningILX44 min
Apr 29, 5:26 PM CDTSevere Thunderstorm WarningILX49 min
Apr 29, 5:50 PM CDTTornado WarningILX25 min
Apr 29, 6:14 PM CDTSevere Thunderstorm WarningILX46 min
Apr 29, 6:22 PM CDTFlash Flood WarningILX6 hr
Apr 29, 6:30 PM CDTMesoscale DiscussionSPC60 min
Apr 30, 12:48 AM CDTAreal Flood WarningILX9 hr
Apr 30, 6:07 AM CDTAreal Flood WarningILX6 hr
Apr 30, 12:02 PM CDTAreal Flood WarningILX4 days
May 2, 2:55 PM CDTFlash Flood WatchILX61 hr
May 4, 7:43 AM CDTFlash Flood WarningILX8 hr
May 4, 3:45 PM CDTAreal Flood WarningILX24 hr
May 10, 6:26 PM CDTMesoscale DiscussionSPC94 min
May 10, 7:07 PM CDTSevere Thunderstorm WatchSPC5 hr
May 17, 4:18 AM CDTWind AdvisoryILX21 hr
Jun 5, 6:14 AM CDTDense Fog AdvisoryILX96 min
Jun 14, 12:40 PM CDTMesoscale DiscussionSPC3 hr
Jun 14, 1:04 PM CDTSevere Thunderstorm WatchSPC9 hr
Jun 14, 2:44 PM CDTSevere Thunderstorm WarningILX32 min
Jun 14, 6:11 PM CDTMesoscale DiscussionSPC64 min
Jun 17, 8:17 PM CDTMesoscale DiscussionSPC58 min
Jun 17, 9:50 PM CDTMesoscale DiscussionSPC55 min
Jun 17, 10:53 PM CDTSevere Thunderstorm WatchSPC6 hr
Jun 18, 1:40 AM CDTMesoscale DiscussionSPC3 hr
Jun 20, 2:05 PM CDTMesoscale DiscussionSPC2 hr
Jul 10, 8:56 PM CDTMesoscale DiscussionSPC2 hr
Jul 10, 10:41 PM CDTSevere Thunderstorm WarningILX31 min
Jul 16, 2:06 PM CDTMesoscale DiscussionSPC54 min
Jul 16, 7:04 PM CDTSpecial Weather StatementILX41 min
Jul 17, 3:11 PM CDTExcessive Heat WatchILX24 hr
Jul 18, 3:07 PM CDTExcessive Heat WarningILX4 days
Jul 22, 7:11 PM CDTMesoscale DiscussionSPC94 min
Jul 23, 3:12 AM CDTMesoscale DiscussionSPC2 hr
Jul 23, 3:32 AM CDTSevere Thunderstorm WatchSPC4 hr
Aug 1, 1:43 PM CDTSpecial Weather StatementILX2 hr
Aug 2, 4:13 PM CDTSpecial Weather StatementILX2 hr
Aug 21, 3:29 PM CDTMesoscale DiscussionSPC91 min
Sep 4, 3:43 PM CDTMesoscale DiscussionSPC2 hr
Sep 4, 4:00 PM CDTSevere Thunderstorm WatchSPC6 hr
Sep 4, 5:22 PM CDTSevere Thunderstorm WarningILX38 min
Sep 4, 6:05 PM CDTMesoscale DiscussionSPC115 min
Sep 4, 9:26 PM CDTMesoscale DiscussionSPC64 min
Sep 14, 1:09 AM CDTDense Fog AdvisoryILX9 hr
Oct 8, 5:20 AM CDTDense Fog AdvisoryILX4 hr
Oct 9, 7:47 AM CDTDense Fog AdvisoryILX3 hr
Oct 25, 3:16 AM CDTFrost AdvisoryILX29 hr
Oct 27, 3:24 AM CDTFreeze WatchILX12 hr
Oct 27, 2:56 PM CDTFreeze WarningILX42 hr
Nov 5, 6:04 AM CSTMesoscale DiscussionSPC2 hr
Nov 5, 11:09 AM CSTMesoscale DiscussionSPC66 min
Nov 5, 12:35 PM CSTTornado WatchSPC6 hr
Nov 5, 2:49 PM CSTSevere Thunderstorm WarningILX41 min
Nov 5, 2:51 PM CSTMesoscale DiscussionSPC114 min
Nov 17, 3:11 PM CSTWind AdvisoryILX27 hr
Nov 18, 10:10 AM CSTSpecial Weather StatementILX65 min
Dec 13, 10:58 AM CSTWind AdvisoryILX10 hr
Dec 23, 3:39 AM CSTWinter Weather AdvisoryILX38 hr
Dec 29, 3:00 PM CSTWind Chill AdvisoryILX4 days

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 archive20162018

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.