Alert archive / Illinois / Lake County
Weather alerts in Lake County, Illinois, 2024
153 weather alerts in 2024, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Lake County and its neighbors
Each county as a circle sized by its count in 2024. Tap one for its archive.
- Alerts
- 153
- Warnings
- 37
- Watches
- 29
- Advisories
- 37
- Busiest month
- July29 alerts
- Busiest day
- July 15, 202410 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
3 of 4 tornado warnings covering Lake County in 2024 had a tornado report inside them; 1 of 1 tornado reports fell inside a warning, on average 23 minutes after it went out.
Lake County, 2024
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 4 | 3 | 25% | 1 | 100% | 23 min |
| Severe thunderstorm warnings | 14 | 9 | 36% | 32 | 81% | 31 min |
| Flash flood warnings | 3 | 1 | 67% | 3 | 100% | 133 min |
Each office's whole area, 2024
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Chicago, IL: tornado warnings | 34 | 20 | 41% | 58 | 69% | 17 min |
| NWS Chicago, IL: severe thunderstorm warnings | 155 | 88 | 43% | 549 | 79% | 30 min |
| NWS Chicago, IL: flash flood warnings | 22 | 6 | 73% | 72 | 72% | 85 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 8, 3:00 AM CST | Winter Weather Advisory | LOT | 47 hr |
| Jan 8, 2:07 PM CST | Winter Storm Warning | LOT | 36 hr |
| Jan 10, 2:18 PM CST | Winter Storm Watch | LOT | 24 hr |
| Jan 11, 2:22 PM CST | Winter Storm Warning | LOT | 37 hr |
| Jan 12, 4:23 AM CST | Mesoscale Discussion | SPC | 4 hr |
| Jan 12, 9:31 AM CST | Winter Weather Advisory | LOT | 26 hr |
| Jan 13, 3:29 AM CST | Wind Chill Advisory | LOT | 4 days |
| Jan 13, 2:17 PM CST | Wind Chill Warning | LOT | 70 hr |
| Jan 13, 2:17 PM CST | Winter Weather Advisory | LOT | 20 hr |
| Jan 14, 3:32 AM CST | Wind Chill Advisory | LOT | 3 days |
| Jan 18, 3:41 AM CST | Winter Weather Advisory | LOT | 26 hr |
| Jan 21, 2:42 PM CST | Winter Weather Advisory | LOT | 42 hr |
| Jan 22, 3:21 AM CST | Winter Weather Advisory | LOT | 33 hr |
| Jan 23, 1:57 PM CST | Dense Fog Advisory | LOT | 22 hr |
| Jan 24, 2:57 PM CST | Dense Fog Advisory | LOT | 30 hr |
| Jan 26, 8:39 AM CST | Dense Fog Advisory | LOT | 5 hr |
| Jan 26, 1:22 PM CST | Dense Fog Advisory | LOT | 33 hr |
| Jan 28, 11:53 AM CST | River Flood Warning | LOT | 4 days |
| Feb 4, 10:23 PM CST | Dense Fog Advisory | LOT | 8 hr |
| Feb 27, 2:35 PM CST | Wind Advisory | LOT | 15 hr |
| Feb 27, 2:50 PM CST | Mesoscale Discussion | SPC | 115 min |
| Feb 27, 3:53 PM CST | Tornado Watch | SPC | 6 hr |
| Feb 27, 5:59 PM CST | Mesoscale Discussion | SPC | 91 min |
| Feb 27, 7:07 PM CST | Severe Thunderstorm Warning | LOT | 68 min |
| Feb 27, 7:17 PM CST | Tornado Warning | LOT | 28 min |
| Feb 27, 7:32 PM CST | Tornado Warning | LOT | 38 min |
| Mar 4, 1:25 PM CST | Mesoscale Discussion | SPC | 2 hr |
| Mar 21, 3:30 AM CDT | Winter Weather Advisory | LOT | 37 hr |
| Apr 1, 9:09 PM CDT | River Flood Warning | LOT | 14 days |
| Apr 1, 9:56 PM CDT | River Flood Watch | MKX | 8 hr |
| Apr 2, 6:02 AM CDT | River Flood Warning | MKX | 21 days |
| Apr 2, 9:32 AM CDT | River Flood Watch | LOT | 21 days |
| Apr 2, 9:32 AM CDT | River Flood Watch | LOT | 21 days |
| Apr 2, 9:17 PM CDT | River Flood Warning | LOT | 6 days |
| Apr 2, 9:17 PM CDT | River Flood Warning | LOT | 9 days |
| Apr 20, 8:47 PM CDT | Frost Advisory | LOT | 11 hr |
| Apr 23, 2:52 PM CDT | Mesoscale Discussion | SPC | 113 min |
| Apr 24, 2:41 AM CDT | Freeze Watch | LOT | 12 hr |
| Apr 24, 2:58 PM CDT | Freeze Warning | LOT | 17 hr |
| Apr 26, 4:15 PM CDT | Special Weather Statement | LOT | 45 min |
| Apr 27, 7:58 PM CDT | Mesoscale Discussion | SPC | 62 min |
| May 2, 3:07 PM CDT | Mesoscale Discussion | SPC | 113 min |
| May 4, 5:41 PM CDT | Special Weather Statement | LOT | 34 min |
| May 4, 6:07 PM CDT | Severe Thunderstorm Warning | LOT | 23 min |
| May 7, 12:14 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 7, 1:28 PM CDT | Tornado Watch | SPC | 12 hr |
| May 8, 1:39 PM CDT | River Flood Watch | MKX | 9 hr |
| May 8, 10:23 PM CDT | River Flood Warning | MKX | 50 hr |
| May 13, 5:22 PM CDT | Areal Flood Advisory | LOT | 4 hr |
| May 13, 5:48 PM CDT | Flash Flood Warning | LOT | 112 min |
| May 20, 10:13 AM CDT | Mesoscale Discussion | SPC | 92 min |
| May 20, 12:39 PM CDT | Severe Thunderstorm Watch | SPC | 3 hr |
| May 20, 2:04 PM CDT | Severe Thunderstorm Warning | LOT | 41 min |
| May 20, 2:19 PM CDT | Severe Thunderstorm Warning | LOT | 41 min |
| May 21, 4:16 AM CDT | Dense Fog Advisory | LOT | 7 hr |
| May 21, 10:20 PM CDT | Wind Advisory | LOT | 6 hr |
| May 24, 6:07 AM CDT | Severe Thunderstorm Watch | SPC | 9 hr |
| May 24, 4:46 PM CDT | Mesoscale Discussion | SPC | 119 min |
| May 26, 3:26 PM CDT | Mesoscale Discussion | SPC | 94 min |
| May 26, 6:10 PM CDT | Severe Thunderstorm Warning | LOT | 80 min |
| May 26, 6:20 PM CDT | Tornado Warning | LOT | 55 min |
| May 26, 7:32 PM CDT | Special Weather Statement | LOT | 43 min |
| May 28, 1:02 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| May 28, 4:49 PM CDT | Areal Flood Advisory | LOT | 3 hr |
| May 28, 5:18 PM CDT | Areal Flood Advisory | LOT | 3 hr |
| Jun 4, 7:47 PM CDT | Special Weather Statement | LOT | 28 min |
| Jun 4, 11:59 PM CDT | Special Weather Statement | LOT | 31 min |
| Jun 5, 2:44 AM CDT | River Flood Watch | MKX | 4 days |
| Jun 9, 3:17 AM CDT | Beach Hazards Statement | LOT | 46 hr |
| Jun 13, 1:02 PM CDT | Mesoscale Discussion | SPC | 118 min |
| Jun 13, 4:46 PM CDT | Mesoscale Discussion | SPC | 89 min |
| Jun 16, 2:15 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jun 16, 3:42 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 16, 5:04 PM CDT | Severe Thunderstorm Warning | LOT | 41 min |
| Jun 22, 7:36 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jun 22, 7:37 PM CDT | Flood Watch | LOT | 5 hr |
| Jun 22, 8:40 PM CDT | Severe Thunderstorm Warning | LOT | 50 min |
| Jun 22, 9:13 PM CDT | Flash Flood Warning | LOT | 4 hr |
| Jun 23, 1:18 AM CDT | Areal Flood Warning | LOT | 9 hr |
| Jun 24, 7:31 PM CDT | Severe Thunderstorm Watch | SPC | 3 hr |
| Jun 25, 1:25 AM CDT | Severe Thunderstorm Warning | LOT | 14 min |
| Jun 25, 5:00 AM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 25, 6:28 AM CDT | Mesoscale Discussion | SPC | 92 min |
| Jun 25, 6:38 AM CDT | Severe Thunderstorm Warning | LOT | 52 min |
| Jun 25, 8:05 AM CDT | Areal Flood Advisory | LOT | 115 min |
| Jun 25, 4:54 PM CDT | Mesoscale Discussion | SPC | 96 min |
| Jun 26, 3:47 AM CDT | Beach Hazards Statement | LOT | 36 hr |
| Jun 29, 3:58 AM CDT | Beach Hazards Statement | LOT | 51 hr |
| Jul 1, 3:00 PM CDT | Beach Hazards Statement | LOT | 21 hr |
| Jul 13, 5:08 PM CDT | Special Weather Statement | LOT | 37 min |
| Jul 13, 10:00 PM CDT | Special Weather Statement | LOT | 30 min |
| Jul 13, 11:41 PM CDT | Areal Flood Advisory | LOT | 3 hr |
| Jul 14, 2:19 AM CDT | Flood Watch | LOT | 9 hr |
| Jul 14, 3:03 PM CDT | Flood Watch | LOT | 11 hr |
| Jul 14, 3:15 PM CDT | Mesoscale Discussion | SPC | 90 min |
| Jul 14, 5:55 PM CDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jul 14, 7:51 PM CDT | Mesoscale Discussion | SPC | 84 min |
| Jul 14, 9:36 PM CDT | Mesoscale Discussion | SPC | 54 min |
| Jul 15, 12:26 PM CDT | River Flood Watch | LOT | 4 days |
| Jul 15, 12:52 PM CDT | Flood Watch | LOT | 14 hr |
| Jul 15, 1:03 PM CDT | River Flood Watch | LOT | 17 hr |
| Jul 15, 1:03 PM CDT | River Flood Watch | LOT | 48 hr |
| Jul 15, 1:03 PM CDT | River Flood Watch | LOT | 4 days |
| Jul 15, 1:59 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 15, 6:06 PM CDT | Mesoscale Discussion | SPC | 114 min |
| Jul 15, 6:53 PM CDT | Tornado Watch | SPC | 6 hr |
| Jul 15, 7:38 PM CDT | Severe Thunderstorm Warning | LOT | 35 min |
| Jul 15, 8:26 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 15, 8:35 PM CDT | Flash Flood Warning | LOT | 4 hr |
| Jul 15, 8:52 PM CDT | Severe Thunderstorm Warning | LOT | 83 min |
| Jul 15, 9:16 PM CDT | Tornado Warning | LOT | 44 min |
| Jul 15, 10:15 PM CDT | River Flood Watch | MKX | 18 hr |
| Jul 15, 11:08 PM CDT | River Flood Warning | LOT | 7 days |
| Jul 15, 11:08 PM CDT | River Flood Warning | LOT | 12 days |
| Jul 16, 5:39 AM CDT | River Flood Warning | LOT | 64 hr |
| Jul 16, 3:56 PM CDT | River Flood Warning | MKX | 62 hr |
| Jul 17, 2:19 PM CDT | Beach Hazards Statement | LOT | 29 hr |
| Aug 5, 2:59 PM CDT | Beach Hazards Statement | LOT | 54 hr |
| Aug 5, 5:09 PM CDT | Mesoscale Discussion | SPC | 66 min |
| Aug 6, 2:26 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 6, 3:36 AM CDT | Severe Thunderstorm Warning | LOT | 39 min |
| Aug 6, 4:02 AM CDT | Severe Thunderstorm Warning | LOT | 43 min |
| Aug 14, 3:43 AM CDT | Dense Fog Advisory | LOT | 5 hr |
| Aug 15, 3:44 AM CDT | Beach Hazards Statement | LOT | 18 hr |
| Aug 16, 5:31 PM CDT | Mesoscale Discussion | SPC | 119 min |
| Aug 17, 3:42 AM CDT | Beach Hazards Statement | LOT | 4 days |
| Aug 24, 2:32 PM CDT | Excessive Heat Watch | LOT | 48 hr |
| Aug 25, 3:35 AM CDT | Heat Advisory | LOT | 40 hr |
| Aug 25, 2:13 PM CDT | Excessive Heat Warning | LOT | 54 hr |
| Aug 27, 11:25 AM CDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 27, 12:04 PM CDT | Severe Thunderstorm Watch | SPC | 2 hr |
| Aug 27, 4:47 PM CDT | Mesoscale Discussion | SPC | 88 min |
| Aug 27, 4:54 PM CDT | Beach Hazards Statement | LOT | 11 hr |
| Aug 27, 4:54 PM CDT | Lakeshore Flood Advisory | LOT | 11 hr |
| Aug 27, 5:09 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 27, 5:45 PM CDT | Severe Thunderstorm Warning | LOT | 75 min |
| Aug 27, 6:24 PM CDT | Mesoscale Discussion | SPC | 96 min |
| Aug 30, 3:07 PM CDT | Beach Hazards Statement | LOT | 68 hr |
| Sep 5, 9:50 AM CDT | Beach Hazards Statement | LOT | 66 hr |
| Sep 18, 3:21 AM CDT | Dense Fog Advisory | LOT | 5 hr |
| Sep 21, 9:34 PM CDT | Beach Hazards Statement | LOT | 47 hr |
| Sep 26, 3:12 PM CDT | Beach Hazards Statement | LOT | 4 days |
| Oct 15, 3:29 AM CDT | Frost Advisory | LOT | 30 hr |
| Oct 16, 1:54 PM CDT | Frost Advisory | LOT | 19 hr |
| Oct 30, 3:06 PM CDT | Wind Advisory | LOT | 31 hr |
| Nov 17, 10:55 PM CST | Dense Fog Advisory | LOT | 7 hr |
| Nov 21, 3:58 AM CST | Winter Weather Advisory | LOT | 11 hr |
| Nov 21, 3:59 AM CST | Wind Advisory | LOT | 10 hr |
| Nov 21, 9:26 AM CST | Mesoscale Discussion | SPC | 3 hr |
| Dec 4, 2:19 AM CST | Wind Advisory | LOT | 22 hr |
| Dec 15, 2:48 AM CST | Dense Fog Advisory | LOT | 9 hr |
| Dec 15, 3:12 PM CST | Dense Fog Advisory | LOT | 20 hr |
| Dec 26, 5:14 AM CST | Dense Fog Advisory | LOT | 16 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 archive20232025
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.