Alert archive / Illinois / DeWitt County

Weather alerts in DeWitt County, Illinois, 2016

85 weather alerts in 2016, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

DeWitt County and its neighbors

Each county as a circle sized by its count in 2016. Tap one for its archive.

Alerts
85
Warnings
19
Watches
9
Advisories
22
Busiest month
July22 alerts
Busiest day
July 13, 20167 alerts

Over time

By month

Warning verification

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

DeWitt County, 2016

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings12925%875%19 min
Flash flood warnings10100%0

Each office's whole area, 2016

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Lincoln, IL: tornado warnings26965%1385%16 min
NWS Lincoln, IL: severe thunderstorm warnings1427051%25268%19 min
NWS Lincoln, IL: flash flood warnings34682%1567%89 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 8, 8:41 AM CSTDense Fog AdvisoryILX3 hr
Jan 9, 3:08 AM CSTWinter Weather AdvisoryILX16 hr
Jan 12, 5:43 AM CSTWinter Weather AdvisoryILX3 hr
Jan 17, 3:30 AM CSTWind Chill AdvisoryILX32 hr
Jan 19, 8:21 PM CSTMesoscale DiscussionSPC3 hr
Feb 2, 7:09 PM CSTDense Fog AdvisoryILX8 hr
Feb 13, 3:32 AM CSTWinter Weather AdvisoryILX38 hr
Feb 15, 7:25 AM CSTDense Fog AdvisoryILX4 hr
Feb 18, 3:03 PM CSTWind AdvisoryILX27 hr
Feb 23, 3:28 PM CSTWinter Storm WarningILX30 hr
Feb 24, 6:34 AM CSTMesoscale DiscussionSPC5 hr
Feb 28, 3:46 AM CSTWind AdvisoryILX14 hr
Mar 14, 3:12 AM CDTDense Fog AdvisoryILX6 hr
Mar 15, 1:29 AM CDTDense Fog AdvisoryILX8 hr
Mar 15, 2:24 PM CDTMesoscale DiscussionSPC66 min
Mar 15, 3:31 PM CDTTornado WatchSPC7 hr
Mar 15, 3:50 PM CDTWind AdvisoryILX28 hr
Mar 15, 8:37 PM CDTSevere Thunderstorm WarningILX23 min
Mar 31, 12:36 PM CDTMesoscale DiscussionSPC84 min
Apr 1, 3:36 PM CDTWind AdvisoryILX27 hr
Apr 2, 3:26 AM CDTFreeze WarningILX29 hr
Apr 2, 9:01 PM CDTWind AdvisoryILX22 hr
Apr 3, 3:09 PM CDTFreeze WatchILX13 hr
Apr 4, 3:41 AM CDTFreeze WarningILX28 hr
Apr 7, 3:40 AM CDTFreeze WatchILX23 hr
Apr 8, 2:56 AM CDTFreeze WarningILX30 hr
Apr 11, 10:26 AM CDTFreeze WarningILX22 hr
Apr 21, 1:29 PM CDTMesoscale DiscussionSPC3 hr
Apr 28, 1:32 AM CDTSpecial Weather StatementILX28 min
May 1, 5:06 PM CDTMesoscale DiscussionSPC114 min
May 11, 1:53 AM CDTDense Fog AdvisoryILX7 hr
May 11, 12:10 PM CDTSevere Thunderstorm WatchSPC12 hr
May 11, 2:48 PM CDTSevere Thunderstorm WarningILX42 min
May 14, 2:44 PM CDTFrost AdvisoryILX16 hr
May 26, 6:44 AM CDTSpecial Weather StatementILX46 min
May 26, 7:30 AM CDTSevere Thunderstorm WarningILX45 min
Jun 9, 7:58 PM CDTMesoscale DiscussionSPC2 hr
Jun 14, 7:18 PM CDTMesoscale DiscussionSPC117 min
Jun 20, 1:54 PM CDTMesoscale DiscussionSPC2 hr
Jun 20, 3:03 PM CDTSevere Thunderstorm WatchSPC7 hr
Jun 20, 6:05 PM CDTMesoscale DiscussionSPC85 min
Jun 20, 9:04 PM CDTSevere Thunderstorm WarningILX41 min
Jun 20, 9:36 PM CDTSevere Thunderstorm WarningILX54 min
Jun 20, 9:44 PM CDTSevere Thunderstorm WarningILX31 min
Jun 22, 4:00 AM CDTMesoscale DiscussionSPC2 hr
Jun 22, 4:25 AM CDTSevere Thunderstorm WatchSPC3 hr
Jun 22, 5:38 AM CDTSevere Thunderstorm WarningILX37 min
Jun 22, 3:38 PM CDTMesoscale DiscussionSPC97 min
Jun 26, 1:05 PM CDTMesoscale DiscussionSPC85 min
Jul 6, 1:27 AM CDTMesoscale DiscussionSPC2 hr
Jul 6, 1:55 AM CDTSevere Thunderstorm WatchSPC6 hr
Jul 6, 5:04 AM CDTMesoscale DiscussionSPC116 min
Jul 6, 5:18 AM CDTSpecial Weather StatementILX42 min
Jul 6, 5:39 AM CDTSpecial Weather StatementILX66 min
Jul 13, 9:19 AM CDTSpecial Weather StatementILX26 min
Jul 13, 9:43 AM CDTSpecial Weather StatementILX47 min
Jul 13, 2:10 PM CDTMesoscale DiscussionSPC65 min
Jul 13, 2:37 PM CDTSevere Thunderstorm WatchSPC5 hr
Jul 13, 4:31 PM CDTSevere Thunderstorm WarningILX44 min
Jul 13, 5:07 PM CDTSevere Thunderstorm WarningILX38 min
Jul 13, 5:08 PM CDTMesoscale DiscussionSPC2 hr
Jul 17, 8:06 PM CDTMesoscale DiscussionSPC84 min
Jul 18, 9:04 AM CDTSpecial Weather StatementILX56 min
Jul 18, 3:41 PM CDTExcessive Heat WatchILX48 hr
Jul 20, 3:11 PM CDTExcessive Heat WarningILX4 days
Jul 21, 11:08 PM CDTMesoscale DiscussionSPC67 min
Jul 24, 10:09 PM CDTSpecial Weather StatementILX51 min
Jul 28, 6:57 AM CDTFlash Flood WarningILX3 hr
Jul 28, 12:12 PM CDTSpecial Weather StatementILX3 hr
Jul 28, 3:03 PM CDTSpecial Weather StatementILX3 hr
Jul 28, 3:37 PM CDTSpecial Weather StatementILX38 min
Aug 14, 3:22 PM CDTSpecial Weather StatementILX3 hr
Aug 24, 1:20 PM CDTMesoscale DiscussionSPC85 min
Aug 25, 1:54 AM CDTSevere Thunderstorm WarningILX36 min
Aug 25, 2:02 AM CDTSevere Thunderstorm WarningILX43 min
Aug 25, 3:16 PM CDTMesoscale DiscussionSPC119 min
Sep 9, 2:15 AM CDTDense Fog AdvisoryILX7 hr
Sep 21, 3:25 PM CDTSpecial Weather StatementILX80 min
Nov 2, 3:32 PM CDTMesoscale DiscussionSPC118 min
Nov 2, 5:14 PM CDTSevere Thunderstorm WarningILX46 min
Nov 18, 10:42 AM CSTWind AdvisoryILX25 hr
Nov 27, 9:09 AM CSTDense Fog AdvisoryILX3 hr
Dec 15, 3:01 PM CSTWinter Weather AdvisoryILX63 hr
Dec 17, 3:45 AM CSTWind Chill AdvisoryILX54 hr
Dec 24, 6:26 AM CSTDense Fog AdvisoryILX4 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 archive20152017

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.