Alert archive / Illinois / Shelby County

Weather alerts in Shelby County, Illinois, 2015

102 weather alerts in 2015, 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 2015. Tap one for its archive.

Alerts
102
Warnings
24
Watches
20
Advisories
35
Busiest month
June20 alerts
Busiest day
June 19, 20155 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 2015 had a tornado report inside them.

Shelby County, 2015

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings10100%0
Severe thunderstorm warnings9367%650%7 min
Flash flood warnings3233%0

Each office's whole area, 2015

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Lincoln, IL: tornado warnings20480%1631%3 min
NWS Lincoln, IL: severe thunderstorm warnings1507252%30767%22 min
NWS Lincoln, IL: flash flood warnings782568%5580%144 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 6, 3:13 AM CSTWind Chill AdvisoryILX57 hr
Jan 10, 3:17 PM CSTWinter Weather AdvisoryILX42 hr
Jan 31, 4:04 AM CSTWinter Weather AdvisoryILX44 hr
Feb 15, 3:14 AM CSTWinter Weather AdvisoryILX38 hr
Feb 17, 3:19 PM CSTWind Chill AdvisoryILX45 hr
Feb 20, 4:02 AM CSTWinter Weather AdvisoryILX11 hr
Feb 20, 2:42 PM CSTWinter Storm WarningILX19 hr
Feb 20, 10:40 PM CSTMesoscale DiscussionSPC3 hr
Feb 22, 3:12 AM CSTWind Chill AdvisoryILX30 hr
Feb 24, 3:41 AM CSTWind Chill AdvisoryILX4 hr
Feb 28, 3:09 AM CSTWinter Weather AdvisoryILX39 hr
Mar 1, 2:55 AM CSTWinter Storm WarningILX12 hr
Mar 2, 3:06 PM CSTWinter Weather AdvisoryILX19 hr
Mar 10, 7:54 PM CDTDense Fog AdvisoryILX16 hr
Mar 13, 10:50 PM CDTDense Fog AdvisoryILX8 hr
Apr 2, 2:46 PM CDTMesoscale DiscussionSPC89 min
Apr 7, 6:48 AM CDTDense Fog AdvisoryILX4 hr
Apr 8, 12:50 PM CDTMesoscale DiscussionSPC85 min
Apr 8, 1:05 PM CDTSevere Thunderstorm WatchSPC5 hr
Apr 8, 2:43 PM CDTMesoscale DiscussionSPC92 min
Apr 8, 3:17 PM CDTFlash Flood WatchILX32 hr
Apr 9, 3:45 PM CDTMesoscale DiscussionSPC60 min
Apr 9, 6:48 PM CDTTornado WatchSPC6 hr
Apr 9, 8:01 PM CDTMesoscale DiscussionSPC89 min
Apr 9, 8:13 PM CDTTornado WarningILX32 min
Apr 9, 8:28 PM CDTSevere Thunderstorm WarningILX47 min
Apr 17, 2:05 AM CDTDense Fog AdvisoryILX7 hr
Apr 22, 3:04 PM CDTFrost AdvisoryILX17 hr
Apr 23, 3:39 PM CDTFrost AdvisoryILX16 hr
May 8, 12:59 PM CDTMesoscale DiscussionSPC3 hr
May 9, 6:39 AM CDTDense Fog AdvisoryILX2 hr
May 10, 6:30 PM CDTMesoscale DiscussionSPC90 min
May 10, 6:35 PM CDTSevere Thunderstorm WarningILX40 min
May 11, 5:50 AM CDTSpecial Weather StatementILX40 min
May 24, 5:34 PM CDTTornado WatchSPC7 hr
May 24, 10:40 PM CDTMesoscale DiscussionSPC95 min
May 24, 11:29 PM CDTSevere Thunderstorm WarningILX25 min
Jun 7, 7:48 PM CDTSevere Thunderstorm WatchSPC7 hr
Jun 7, 9:15 PM CDTSevere Thunderstorm WarningILX45 min
Jun 7, 9:52 PM CDTMesoscale DiscussionSPC53 min
Jun 15, 7:00 PM CDTSevere Thunderstorm WarningILX30 min
Jun 15, 7:31 PM CDTSevere Thunderstorm WarningILX29 min
Jun 16, 3:14 AM CDTFlash Flood WatchILX40 hr
Jun 19, 5:26 AM CDTFlash Flood WarningILX6 hr
Jun 19, 6:32 AM CDTFlash Flood WarningILX12 hr
Jun 19, 11:34 AM CDTAreal Flood AdvisoryILX6 hr
Jun 19, 11:42 AM CDTAreal Flood WarningILX12 hr
Jun 19, 6:27 PM CDTAreal Flood WarningILX15 hr
Jun 19, 11:46 PM CDTAreal Flood WarningILX9 hr
Jun 20, 3:49 PM CDTTornado WatchSPC7 hr
Jun 20, 10:13 PM CDTSevere Thunderstorm WatchSPC4 hr
Jun 20, 10:46 PM CDTSevere Thunderstorm WarningILX59 min
Jun 25, 3:55 PM CDTMesoscale DiscussionSPC2 hr
Jun 25, 4:53 PM CDTSevere Thunderstorm WatchSPC9 hr
Jun 26, 4:05 AM CDTFlash Flood WatchILX18 hr
Jun 28, 7:45 PM CDTSevere Thunderstorm WarningILX45 min
Jun 28, 11:06 PM CDTAreal Flood AdvisoryILX3 hr
Jul 7, 2:46 PM CDTFlash Flood WatchILX39 hr
Jul 11, 12:33 PM CDTMesoscale DiscussionSPC87 min
Jul 11, 1:39 PM CDTSevere Thunderstorm WatchSPC6 hr
Jul 11, 3:56 PM CDTMesoscale DiscussionSPC2 hr
Jul 11, 6:36 PM CDTMesoscale DiscussionSPC84 min
Jul 11, 8:00 PM CDTSevere Thunderstorm WatchSPC6 hr
Jul 11, 9:57 PM CDTMesoscale DiscussionSPC93 min
Jul 12, 3:14 PM CDTHeat AdvisoryILX29 hr
Jul 12, 3:27 PM CDTFlash Flood WatchILX31 hr
Jul 13, 4:01 PM CDTTornado WatchSPC7 hr
Jul 13, 6:59 PM CDTMesoscale DiscussionSPC91 min
Jul 14, 12:56 AM CDTMesoscale DiscussionSPC64 min
Jul 16, 9:55 PM CDTMesoscale DiscussionSPC110 min
Jul 17, 10:16 AM CDTHeat AdvisoryILX33 hr
Jul 27, 3:01 PM CDTHeat AdvisoryILX29 hr
Aug 9, 9:56 AM CDTSpecial Weather StatementILX64 min
Aug 18, 1:15 PM CDTSevere Thunderstorm WatchSPC8 hr
Aug 18, 3:16 PM CDTMesoscale DiscussionSPC119 min
Aug 18, 6:35 PM CDTMesoscale DiscussionSPC115 min
Oct 15, 2:56 PM CDTFreeze WatchILX12 hr
Oct 16, 2:45 AM CDTFreeze WarningILX30 hr
Oct 17, 2:33 PM CDTFreeze WarningILX18 hr
Nov 1, 5:58 AM CSTDense Fog AdvisoryILX3 hr
Nov 2, 6:58 AM CSTDense Fog AdvisoryILX3 hr
Nov 2, 7:59 PM CSTDense Fog AdvisoryILX14 hr
Nov 3, 7:16 PM CSTDense Fog AdvisoryILX15 hr
Nov 10, 3:41 PM CSTWind AdvisoryILX50 hr
Nov 16, 3:08 AM CSTFlood WatchILX51 hr
Dec 4, 1:52 AM CSTDense Fog AdvisoryILX11 hr
Dec 4, 5:53 PM CSTDense Fog AdvisoryILX18 hr
Dec 6, 9:24 PM CSTDense Fog AdvisoryILX23 hr
Dec 23, 9:13 AM CSTTornado WatchSPC8 hr
Dec 23, 9:16 AM CSTSpecial Weather StatementILX29 min
Dec 23, 9:48 AM CSTSevere Thunderstorm WarningILX27 min
Dec 25, 3:27 AM CSTFlash Flood WatchILX5 days
Dec 26, 10:15 AM CSTAreal Flood AdvisoryILX6 hr
Dec 26, 12:03 PM CSTAreal Flood AdvisoryILX3 hr
Dec 26, 2:56 PM CSTAreal Flood AdvisoryILX6 hr
Dec 26, 4:38 PM CSTAreal Flood AdvisoryILX6 hr
Dec 26, 8:01 PM CSTFlash Flood WarningILX8 hr
Dec 27, 4:03 AM CSTAreal Flood WarningILX12 hr
Dec 27, 3:15 PM CSTWind AdvisoryILX26 hr
Dec 27, 3:51 PM CSTAreal Flood WarningILX24 hr
Dec 28, 3:41 PM CSTAreal Flood WarningILX48 hr
Dec 30, 3:27 PM CSTAreal Flood WarningILX24 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 archive20142016

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.