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
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 16 | 14 | 13% | 22 | 91% | 24 min |
| Flash flood warnings | 2 | 2 | 0% | 1 | 0% |
Each office's whole area, 2019
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Chicago, IL: tornado warnings | 18 | 3 | 83% | 9 | 44% | 17 min |
| NWS Chicago, IL: severe thunderstorm warnings | 127 | 72 | 43% | 281 | 75% | 24 min |
| NWS Chicago, IL: flash flood warnings | 23 | 9 | 61% | 40 | 57% | 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.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jan 2, 6:04 AM CST | Winter Weather Advisory | LOT | 5 hr |
| Jan 7, 2:10 PM CST | Wind Advisory | LOT | 33 hr |
| Jan 11, 3:15 AM CST | Winter Weather Advisory | LOT | 48 hr |
| Jan 14, 1:45 PM CST | Winter Weather Advisory | LOT | 16 hr |
| Jan 17, 12:13 PM CST | Winter Storm Watch | LOT | 15 hr |
| Jan 18, 3:23 AM CST | Winter Storm Warning | LOT | 35 hr |
| Jan 18, 6:58 PM CST | Mesoscale Discussion | SPC | 6 hr |
| Jan 21, 1:57 PM CST | Winter Weather Advisory | LOT | 46 hr |
| Jan 22, 2:36 PM CST | Mesoscale Discussion | SPC | 4 hr |
| Jan 23, 3:00 PM CST | Wind Chill Advisory | LOT | 45 hr |
| Jan 26, 10:01 PM CST | Wind Chill Advisory | LOT | 11 hr |
| Jan 27, 3:01 AM CST | Winter Weather Advisory | LOT | 45 hr |
| Jan 28, 2:42 AM CST | Mesoscale Discussion | SPC | 4 hr |
| Jan 28, 3:01 AM CST | Wind Chill Watch | LOT | 11 hr |
| Jan 28, 1:36 PM CST | Wind Chill Warning | LOT | 70 hr |
| Jan 28, 1:36 PM CST | Wind Chill Advisory | LOT | 28 hr |
| Feb 2, 7:12 PM CST | Dense Fog Advisory | LOT | 6 hr |
| Feb 4, 2:05 PM CST | Winter Weather Advisory | LOT | 34 hr |
| Feb 5, 3:31 AM CST | Ice Storm Warning | LOT | 23 hr |
| Feb 5, 5:56 PM CST | Mesoscale Discussion | SPC | 6 hr |
| Feb 7, 9:21 AM CST | Dense Fog Advisory | LOT | 5 hr |
| Feb 7, 12:14 PM CST | Wind Advisory | LOT | 15 hr |
| Feb 10, 2:43 PM CST | Winter Weather Advisory | LOT | 60 hr |
| Feb 11, 7:21 PM CST | Mesoscale Discussion | SPC | 6 hr |
| Feb 11, 9:59 PM CST | Ice Storm Warning | LOT | 11 hr |
| Feb 12, 3:44 AM CST | Wind Advisory | LOT | 23 hr |
| Feb 12, 7:57 AM CST | Dense Fog Advisory | LOT | 2 hr |
| Feb 19, 3:35 AM CST | Winter Weather Advisory | LOT | 35 hr |
| Feb 22, 3:06 PM CST | High Wind Watch | LOT | 23 hr |
| Feb 23, 2:07 PM CST | High Wind Warning | LOT | 31 hr |
| Mar 3, 3:11 AM CST | Wind Chill Advisory | LOT | 32 hr |
| Mar 9, 2:29 PM CST | Wind Advisory | LOT | 16 hr |
| Mar 13, 2:42 PM CDT | Wind Advisory | LOT | 31 hr |
| Mar 14, 10:54 AM CDT | Mesoscale Discussion | SPC | 96 min |
| Mar 14, 12:24 PM CDT | Special Weather Statement | LOT | 36 min |
| Mar 14, 12:24 PM CDT | Tornado Watch | SPC | 2 hr |
| Mar 14, 12:38 PM CDT | Special Weather Statement | LOT | 52 min |
| Mar 14, 1:22 PM CDT | Special Weather Statement | LOT | 53 min |
| Apr 6, 5:03 AM CDT | Dense Fog Advisory | LOT | 4 hr |
| Apr 7, 5:55 PM CDT | Special Weather Statement | LOT | 20 min |
| Apr 12, 3:23 AM CDT | Wind Advisory | LOT | 17 hr |
| Apr 22, 8:59 PM CDT | Special Weather Statement | LOT | 31 min |
| Apr 26, 2:32 PM CDT | Winter Storm Watch | LOT | 13 hr |
| Apr 26, 8:14 PM CDT | Winter Storm Warning | LOT | 21 hr |
| Apr 27, 5:16 PM CDT | Winter Weather Advisory | LOT | 6 hr |
| Apr 29, 9:08 AM CDT | River Flood Warning | LOT | 28 hr |
| Apr 30, 10:44 AM CDT | River Flood Advisory | LOT | 42 hr |
| Apr 30, 2:44 PM CDT | Flash Flood Watch | LOT | 17 hr |
| Apr 30, 8:44 PM CDT | River Flood Warning | LOT | 62 hr |
| May 1, 2:14 PM CDT | Flash Flood Watch | LOT | 27 hr |
| May 16, 12:11 PM CDT | Severe Thunderstorm Warning | LOT | 49 min |
| May 16, 7:57 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 16, 11:31 PM CDT | Special Weather Statement | LOT | 14 min |
| May 16, 11:44 PM CDT | Severe Thunderstorm Warning | LOT | 61 min |
| May 17, 12:27 AM CDT | Severe Thunderstorm Warning | LOT | 50 min |
| May 18, 1:52 PM CDT | Severe Thunderstorm Warning | LOT | 23 min |
| May 24, 3:33 AM CDT | Flash Flood Watch | LOT | 22 hr |
| May 27, 12:50 PM CDT | Mesoscale Discussion | SPC | 85 min |
| May 27, 1:22 PM CDT | Tornado Watch | SPC | 9 hr |
| May 27, 1:43 PM CDT | Severe Thunderstorm Warning | LOT | 62 min |
| May 27, 2:00 PM CDT | Areal Flood Advisory | LOT | 2 hr |
| May 27, 3:57 PM CDT | Mesoscale Discussion | SPC | 93 min |
| May 27, 4:25 PM CDT | Special Weather Statement | LOT | 50 min |
| May 27, 4:43 PM CDT | Areal Flood Advisory | LOT | 3 hr |
| May 27, 5:27 PM CDT | Areal Flood Advisory | LOT | 3 hr |
| Jun 1, 2:23 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 1, 5:21 PM CDT | Mesoscale Discussion | SPC | 54 min |
| Jun 5, 1:00 AM CDT | Areal Flood Advisory | LOT | 5 hr |
| Jun 18, 4:26 AM CDT | Dense Fog Advisory | LOT | 5 hr |
| Jun 24, 4:47 PM CDT | Special Weather Statement | LOT | 28 min |
| Jun 25, 1:10 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 25, 1:52 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 25, 3:58 PM CDT | Special Weather Statement | LOT | 32 min |
| Jun 25, 6:36 PM CDT | Mesoscale Discussion | SPC | 54 min |
| Jun 26, 6:56 PM CDT | Special Weather Statement | LOT | 34 min |
| Jun 26, 7:21 PM CDT | Special Weather Statement | LOT | 24 min |
| Jun 26, 7:30 PM CDT | Severe Thunderstorm Warning | LOT | 33 min |
| Jun 26, 7:34 PM CDT | Severe Thunderstorm Warning | LOT | 26 min |
| Jun 26, 7:59 PM CDT | Special Weather Statement | LOT | 31 min |
| Jun 27, 3:40 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jun 27, 5:49 PM CDT | Special Weather Statement | LOT | 56 min |
| Jun 27, 6:17 PM CDT | Mesoscale Discussion | SPC | 118 min |
| Jun 27, 7:15 PM CDT | Special Weather Statement | LOT | 45 min |
| Jun 28, 10:43 AM CDT | Special Weather Statement | LOT | 47 min |
| Jun 30, 11:43 AM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 30, 1:02 PM CDT | Severe Thunderstorm Warning | LOT | 73 min |
| Jun 30, 1:38 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 30, 2:13 PM CDT | Severe Thunderstorm Warning | LOT | 77 min |
| Jul 2, 2:31 PM CDT | Mesoscale Discussion | SPC | 89 min |
| Jul 2, 7:28 PM CDT | Severe Thunderstorm Warning | LOT | 35 min |
| Jul 2, 7:41 PM CDT | Areal Flood Advisory | LOT | 3 hr |
| Jul 2, 8:17 PM CDT | Severe Thunderstorm Warning | LOT | 43 min |
| Jul 2, 8:30 PM CDT | Flash Flood Warning | LOT | 4 hr |
| Jul 13, 6:30 PM CDT | Special Weather Statement | LOT | 30 min |
| Jul 13, 6:59 PM CDT | Special Weather Statement | LOT | 31 min |
| Jul 14, 5:59 PM CDT | Special Weather Statement | LOT | 31 min |
| Jul 16, 2:30 PM CDT | Excessive Heat Watch | LOT | 24 hr |
| Jul 17, 2:14 PM CDT | Excessive Heat Warning | LOT | 3 days |
| Jul 18, 8:12 AM CDT | Areal Flood Advisory | LOT | 3 hr |
| Jul 18, 11:14 AM CDT | Areal Flood Advisory | LOT | 3 hr |
| Jul 20, 2:47 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jul 20, 4:49 PM CDT | Special Weather Statement | LOT | 26 min |
| Jul 20, 4:58 PM CDT | Mesoscale Discussion | SPC | 62 min |
| Jul 21, 10:12 AM CDT | Areal Flood Advisory | LOT | 3 hr |
| Jul 21, 12:31 PM CDT | Areal Flood Advisory | LOT | 3 hr |
| Aug 8, 1:31 AM CDT | Special Weather Statement | LOT | 14 min |
| Aug 16, 4:32 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 17, 8:00 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 18, 5:44 AM CDT | Mesoscale Discussion | SPC | 91 min |
| Aug 18, 6:06 AM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 18, 6:52 AM CDT | Special Weather Statement | LOT | 53 min |
| Aug 18, 6:59 AM CDT | Severe Thunderstorm Warning | LOT | 61 min |
| Aug 18, 7:13 AM CDT | Severe Thunderstorm Warning | LOT | 62 min |
| Aug 18, 7:40 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 18, 8:20 AM CDT | Severe Thunderstorm Warning | LOT | 55 min |
| Aug 18, 8:41 AM CDT | Severe Thunderstorm Warning | LOT | 49 min |
| Aug 18, 8:55 AM CDT | Areal Flood Advisory | LOT | 3 hr |
| Aug 20, 9:04 AM CDT | Mesoscale Discussion | SPC | 86 min |
| Aug 20, 10:49 AM CDT | Special Weather Statement | LOT | 41 min |
| Sep 3, 8:38 AM CDT | Special Weather Statement | LOT | 52 min |
| Sep 3, 3:54 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 11, 3:33 PM CDT | Mesoscale Discussion | SPC | 117 min |
| Sep 12, 1:27 PM CDT | Mesoscale Discussion | SPC | 93 min |
| Sep 12, 6:04 PM CDT | Mesoscale Discussion | SPC | 116 min |
| Sep 12, 10:58 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 13, 12:52 AM CDT | Severe Thunderstorm Warning | LOT | 25 min |
| Sep 13, 4:08 AM CDT | Special Weather Statement | LOT | 37 min |
| Sep 14, 2:47 PM CDT | Flash Flood Watch | LOT | 19 hr |
| Sep 21, 3:35 AM CDT | Flash Flood Watch | LOT | 41 hr |
| Sep 22, 6:16 PM CDT | Areal Flood Advisory | LOT | 3 hr |
| Sep 27, 1:43 PM CDT | Flash Flood Watch | LOT | 16 hr |
| Sep 27, 6:21 PM CDT | Mesoscale Discussion | SPC | 114 min |
| Sep 27, 7:21 PM CDT | Areal Flood Advisory | LOT | 5 hr |
| Sep 27, 7:48 PM CDT | Flash Flood Warning | LOT | 6 hr |
| Sep 28, 2:41 PM CDT | Flash Flood Watch | LOT | 16 hr |
| Sep 29, 11:04 AM CDT | River Flood Advisory | LOT | 20 hr |
| Sep 30, 1:40 AM CDT | Dense Fog Advisory | LOT | 7 hr |
| Oct 2, 11:46 PM CDT | Areal Flood Advisory | LOT | 3 hr |
| Oct 3, 12:05 AM CDT | Areal Flood Advisory | LOT | 4 hr |
| Oct 4, 7:16 AM CDT | River Flood Advisory | LOT | 18 hr |
| Oct 11, 9:32 AM CDT | Areal Flood Advisory | LOT | 3 hr |
| Oct 13, 2:23 PM CDT | Frost Advisory | LOT | 18 hr |
| Oct 26, 10:04 AM CDT | Flood Watch | LOT | 16 hr |
| Oct 26, 7:10 PM CDT | Areal Flood Advisory | LOT | 96 min |
| Oct 26, 8:44 PM CDT | Areal Flood Warning | LOT | 12 hr |
| Oct 29, 2:55 PM CDT | Winter Weather Advisory | LOT | 19 hr |
| Oct 30, 2:27 PM CDT | Winter Weather Advisory | LOT | 28 hr |
| Nov 10, 12:55 PM CST | Winter Weather Advisory | LOT | 32 hr |
| Nov 25, 2:44 PM CST | High Wind Watch | LOT | 23 hr |
| Nov 26, 1:26 PM CST | High Wind Warning | LOT | 29 hr |
| Dec 1, 2:48 AM CST | Dense Fog Advisory | LOT | 9 hr |
| Dec 24, 3:08 AM CST | Dense Fog Advisory | LOT | 7 hr |
| Dec 29, 11:01 AM CST | River Flood Advisory | LOT | 24 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.