Alert archive / Illinois / DuPage County

Weather alerts in DuPage County, Illinois, 2019

153 weather alerts in 2019, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

DuPage County and its neighbors

Each county as a circle sized by its count in 2019. Tap one for its archive.

Alerts
153
Warnings
29
Watches
23
Advisories
51
Busiest month
June23 alerts
Busiest day
August 18, 20199 alerts

Over time

By month

Warning verification

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

DuPage County, 2019

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings161413%2291%24 min
Flash flood warnings220%10%

Each office's whole area, 2019

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Chicago, IL: tornado warnings18383%944%17 min
NWS Chicago, IL: severe thunderstorm warnings1277243%28175%24 min
NWS Chicago, IL: flash flood warnings23961%4057%110 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, 6:04 AM CSTWinter Weather AdvisoryLOT5 hr
Jan 7, 2:10 PM CSTWind AdvisoryLOT33 hr
Jan 11, 3:15 AM CSTWinter Weather AdvisoryLOT48 hr
Jan 14, 1:45 PM CSTWinter Weather AdvisoryLOT16 hr
Jan 17, 12:13 PM CSTWinter Storm WatchLOT15 hr
Jan 18, 3:23 AM CSTWinter Storm WarningLOT35 hr
Jan 18, 6:58 PM CSTMesoscale DiscussionSPC6 hr
Jan 21, 1:57 PM CSTWinter Weather AdvisoryLOT46 hr
Jan 22, 2:36 PM CSTMesoscale DiscussionSPC4 hr
Jan 23, 3:00 PM CSTWind Chill AdvisoryLOT45 hr
Jan 26, 10:01 PM CSTWind Chill AdvisoryLOT11 hr
Jan 27, 3:01 AM CSTWinter Weather AdvisoryLOT45 hr
Jan 28, 2:42 AM CSTMesoscale DiscussionSPC4 hr
Jan 28, 3:01 AM CSTWind Chill WatchLOT11 hr
Jan 28, 1:36 PM CSTWind Chill WarningLOT70 hr
Jan 28, 1:36 PM CSTWind Chill AdvisoryLOT28 hr
Feb 2, 7:12 PM CSTDense Fog AdvisoryLOT6 hr
Feb 4, 2:05 PM CSTWinter Weather AdvisoryLOT34 hr
Feb 5, 3:31 AM CSTIce Storm WarningLOT23 hr
Feb 5, 5:56 PM CSTMesoscale DiscussionSPC6 hr
Feb 7, 9:21 AM CSTDense Fog AdvisoryLOT5 hr
Feb 7, 12:14 PM CSTWind AdvisoryLOT15 hr
Feb 10, 2:43 PM CSTWinter Weather AdvisoryLOT60 hr
Feb 11, 7:21 PM CSTMesoscale DiscussionSPC6 hr
Feb 11, 9:59 PM CSTIce Storm WarningLOT11 hr
Feb 12, 3:44 AM CSTWind AdvisoryLOT23 hr
Feb 12, 7:57 AM CSTDense Fog AdvisoryLOT2 hr
Feb 19, 3:35 AM CSTWinter Weather AdvisoryLOT35 hr
Feb 22, 3:06 PM CSTHigh Wind WatchLOT23 hr
Feb 23, 2:07 PM CSTHigh Wind WarningLOT31 hr
Mar 3, 3:11 AM CSTWind Chill AdvisoryLOT32 hr
Mar 9, 2:29 PM CSTWind AdvisoryLOT16 hr
Mar 13, 2:42 PM CDTWind AdvisoryLOT31 hr
Mar 14, 10:54 AM CDTMesoscale DiscussionSPC96 min
Mar 14, 12:24 PM CDTSpecial Weather StatementLOT36 min
Mar 14, 12:24 PM CDTTornado WatchSPC2 hr
Mar 14, 12:38 PM CDTSpecial Weather StatementLOT52 min
Mar 14, 1:22 PM CDTSpecial Weather StatementLOT53 min
Apr 6, 5:03 AM CDTDense Fog AdvisoryLOT4 hr
Apr 7, 5:55 PM CDTSpecial Weather StatementLOT20 min
Apr 12, 3:23 AM CDTWind AdvisoryLOT17 hr
Apr 22, 8:59 PM CDTSpecial Weather StatementLOT31 min
Apr 26, 2:32 PM CDTWinter Storm WatchLOT13 hr
Apr 26, 8:14 PM CDTWinter Storm WarningLOT21 hr
Apr 27, 5:16 PM CDTWinter Weather AdvisoryLOT6 hr
Apr 29, 9:08 AM CDTRiver Flood WarningLOT28 hr
Apr 30, 10:44 AM CDTRiver Flood AdvisoryLOT42 hr
Apr 30, 2:44 PM CDTFlash Flood WatchLOT17 hr
Apr 30, 8:44 PM CDTRiver Flood WarningLOT62 hr
May 1, 2:14 PM CDTFlash Flood WatchLOT27 hr
May 16, 12:11 PM CDTSevere Thunderstorm WarningLOT49 min
May 16, 7:57 PM CDTSevere Thunderstorm WatchSPC6 hr
May 16, 11:31 PM CDTSpecial Weather StatementLOT14 min
May 16, 11:44 PM CDTSevere Thunderstorm WarningLOT61 min
May 17, 12:27 AM CDTSevere Thunderstorm WarningLOT50 min
May 18, 1:52 PM CDTSevere Thunderstorm WarningLOT23 min
May 24, 3:33 AM CDTFlash Flood WatchLOT22 hr
May 27, 12:50 PM CDTMesoscale DiscussionSPC85 min
May 27, 1:22 PM CDTTornado WatchSPC9 hr
May 27, 1:43 PM CDTSevere Thunderstorm WarningLOT62 min
May 27, 2:00 PM CDTAreal Flood AdvisoryLOT2 hr
May 27, 3:57 PM CDTMesoscale DiscussionSPC93 min
May 27, 4:25 PM CDTSpecial Weather StatementLOT50 min
May 27, 4:43 PM CDTAreal Flood AdvisoryLOT3 hr
May 27, 5:27 PM CDTAreal Flood AdvisoryLOT3 hr
Jun 1, 2:23 PM CDTSevere Thunderstorm WatchSPC6 hr
Jun 1, 5:21 PM CDTMesoscale DiscussionSPC54 min
Jun 5, 1:00 AM CDTAreal Flood AdvisoryLOT5 hr
Jun 18, 4:26 AM CDTDense Fog AdvisoryLOT5 hr
Jun 24, 4:47 PM CDTSpecial Weather StatementLOT28 min
Jun 25, 1:10 PM CDTMesoscale DiscussionSPC2 hr
Jun 25, 1:52 PM CDTSevere Thunderstorm WatchSPC7 hr
Jun 25, 3:58 PM CDTSpecial Weather StatementLOT32 min
Jun 25, 6:36 PM CDTMesoscale DiscussionSPC54 min
Jun 26, 6:56 PM CDTSpecial Weather StatementLOT34 min
Jun 26, 7:21 PM CDTSpecial Weather StatementLOT24 min
Jun 26, 7:30 PM CDTSevere Thunderstorm WarningLOT33 min
Jun 26, 7:34 PM CDTSevere Thunderstorm WarningLOT26 min
Jun 26, 7:59 PM CDTSpecial Weather StatementLOT31 min
Jun 27, 3:40 PM CDTSevere Thunderstorm WatchSPC5 hr
Jun 27, 5:49 PM CDTSpecial Weather StatementLOT56 min
Jun 27, 6:17 PM CDTMesoscale DiscussionSPC118 min
Jun 27, 7:15 PM CDTSpecial Weather StatementLOT45 min
Jun 28, 10:43 AM CDTSpecial Weather StatementLOT47 min
Jun 30, 11:43 AM CDTSevere Thunderstorm WatchSPC6 hr
Jun 30, 1:02 PM CDTSevere Thunderstorm WarningLOT73 min
Jun 30, 1:38 PM CDTMesoscale DiscussionSPC2 hr
Jun 30, 2:13 PM CDTSevere Thunderstorm WarningLOT77 min
Jul 2, 2:31 PM CDTMesoscale DiscussionSPC89 min
Jul 2, 7:28 PM CDTSevere Thunderstorm WarningLOT35 min
Jul 2, 7:41 PM CDTAreal Flood AdvisoryLOT3 hr
Jul 2, 8:17 PM CDTSevere Thunderstorm WarningLOT43 min
Jul 2, 8:30 PM CDTFlash Flood WarningLOT4 hr
Jul 13, 6:30 PM CDTSpecial Weather StatementLOT30 min
Jul 13, 6:59 PM CDTSpecial Weather StatementLOT31 min
Jul 14, 5:59 PM CDTSpecial Weather StatementLOT31 min
Jul 16, 2:30 PM CDTExcessive Heat WatchLOT24 hr
Jul 17, 2:14 PM CDTExcessive Heat WarningLOT3 days
Jul 18, 8:12 AM CDTAreal Flood AdvisoryLOT3 hr
Jul 18, 11:14 AM CDTAreal Flood AdvisoryLOT3 hr
Jul 20, 2:47 PM CDTSevere Thunderstorm WatchSPC4 hr
Jul 20, 4:49 PM CDTSpecial Weather StatementLOT26 min
Jul 20, 4:58 PM CDTMesoscale DiscussionSPC62 min
Jul 21, 10:12 AM CDTAreal Flood AdvisoryLOT3 hr
Jul 21, 12:31 PM CDTAreal Flood AdvisoryLOT3 hr
Aug 8, 1:31 AM CDTSpecial Weather StatementLOT14 min
Aug 16, 4:32 PM CDTMesoscale DiscussionSPC2 hr
Aug 17, 8:00 AM CDTMesoscale DiscussionSPC2 hr
Aug 18, 5:44 AM CDTMesoscale DiscussionSPC91 min
Aug 18, 6:06 AM CDTSevere Thunderstorm WatchSPC6 hr
Aug 18, 6:52 AM CDTSpecial Weather StatementLOT53 min
Aug 18, 6:59 AM CDTSevere Thunderstorm WarningLOT61 min
Aug 18, 7:13 AM CDTSevere Thunderstorm WarningLOT62 min
Aug 18, 7:40 AM CDTMesoscale DiscussionSPC2 hr
Aug 18, 8:20 AM CDTSevere Thunderstorm WarningLOT55 min
Aug 18, 8:41 AM CDTSevere Thunderstorm WarningLOT49 min
Aug 18, 8:55 AM CDTAreal Flood AdvisoryLOT3 hr
Aug 20, 9:04 AM CDTMesoscale DiscussionSPC86 min
Aug 20, 10:49 AM CDTSpecial Weather StatementLOT41 min
Sep 3, 8:38 AM CDTSpecial Weather StatementLOT52 min
Sep 3, 3:54 PM CDTMesoscale DiscussionSPC2 hr
Sep 11, 3:33 PM CDTMesoscale DiscussionSPC117 min
Sep 12, 1:27 PM CDTMesoscale DiscussionSPC93 min
Sep 12, 6:04 PM CDTMesoscale DiscussionSPC116 min
Sep 12, 10:58 PM CDTMesoscale DiscussionSPC2 hr
Sep 13, 12:52 AM CDTSevere Thunderstorm WarningLOT25 min
Sep 13, 4:08 AM CDTSpecial Weather StatementLOT37 min
Sep 14, 2:47 PM CDTFlash Flood WatchLOT19 hr
Sep 21, 3:35 AM CDTFlash Flood WatchLOT41 hr
Sep 22, 6:16 PM CDTAreal Flood AdvisoryLOT3 hr
Sep 27, 1:43 PM CDTFlash Flood WatchLOT16 hr
Sep 27, 6:21 PM CDTMesoscale DiscussionSPC114 min
Sep 27, 7:21 PM CDTAreal Flood AdvisoryLOT5 hr
Sep 27, 7:48 PM CDTFlash Flood WarningLOT6 hr
Sep 28, 2:41 PM CDTFlash Flood WatchLOT16 hr
Sep 29, 11:04 AM CDTRiver Flood AdvisoryLOT20 hr
Sep 30, 1:40 AM CDTDense Fog AdvisoryLOT7 hr
Oct 2, 11:46 PM CDTAreal Flood AdvisoryLOT3 hr
Oct 3, 12:05 AM CDTAreal Flood AdvisoryLOT4 hr
Oct 4, 7:16 AM CDTRiver Flood AdvisoryLOT18 hr
Oct 11, 9:32 AM CDTAreal Flood AdvisoryLOT3 hr
Oct 13, 2:23 PM CDTFrost AdvisoryLOT18 hr
Oct 26, 10:04 AM CDTFlood WatchLOT16 hr
Oct 26, 7:10 PM CDTAreal Flood AdvisoryLOT96 min
Oct 26, 8:44 PM CDTAreal Flood WarningLOT12 hr
Oct 29, 2:55 PM CDTWinter Weather AdvisoryLOT19 hr
Oct 30, 2:27 PM CDTWinter Weather AdvisoryLOT28 hr
Nov 10, 12:55 PM CSTWinter Weather AdvisoryLOT32 hr
Nov 25, 2:44 PM CSTHigh Wind WatchLOT23 hr
Nov 26, 1:26 PM CSTHigh Wind WarningLOT29 hr
Dec 1, 2:48 AM CSTDense Fog AdvisoryLOT9 hr
Dec 24, 3:08 AM CSTDense Fog AdvisoryLOT7 hr
Dec 29, 11:01 AM CSTRiver Flood AdvisoryLOT24 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 archive20182020

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.