Alert archive / Illinois / Iroquois County
Weather alerts in Iroquois County, Illinois, 2016
109 weather alerts in 2016, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Iroquois County and its neighbors
Each county as a circle sized by its count in 2016. Tap one for its archive.
- Alerts
- 109
- Warnings
- 27
- Watches
- 12
- Advisories
- 35
- Busiest month
- July30 alerts
- Busiest day
- July 18, 201612 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
2 of 4 tornado warnings covering Iroquois County in 2016 had a tornado report inside them; 1 of 1 tornado reports fell inside a warning, on average 22 minutes after it went out.
Iroquois County, 2016
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 4 | 2 | 50% | 1 | 100% | 22 min |
| Severe thunderstorm warnings | 9 | 5 | 44% | 1 | 100% | 30 min |
| Flash flood warnings | 4 | 1 | 75% | 1 | 100% | 68 min |
Each office's whole area, 2016
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Chicago, IL: tornado warnings | 17 | 9 | 47% | 26 | 65% | 17 min |
| NWS Chicago, IL: severe thunderstorm warnings | 97 | 46 | 53% | 155 | 55% | 21 min |
| NWS Chicago, IL: flash flood warnings | 25 | 12 | 52% | 27 | 78% | 55 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, 3:08 PM CST | Winter Storm Watch | LOT | 12 hr |
| Jan 9, 3:09 AM CST | Winter Weather Advisory | LOT | 16 hr |
| Jan 17, 3:02 AM CST | Wind Chill Advisory | LOT | 33 hr |
| Feb 2, 6:19 PM CST | Mesoscale Discussion | SPC | 116 min |
| Feb 2, 6:26 PM CST | Special Weather Statement | LOT | 34 min |
| Feb 2, 6:48 PM CST | Areal Flood Advisory | LOT | 3 hr |
| Feb 2, 9:55 PM CST | Dense Fog Advisory | LOT | 7 hr |
| Feb 13, 2:29 PM CST | Winter Weather Advisory | LOT | 34 hr |
| Feb 18, 2:46 PM CST | Wind Advisory | LOT | 27 hr |
| Feb 23, 2:42 AM CST | Winter Storm Watch | LOT | 13 hr |
| Feb 23, 3:12 PM CST | Winter Storm Warning | LOT | 30 hr |
| Feb 24, 3:15 AM CST | Blizzard Warning | LOT | 24 hr |
| Feb 24, 6:34 AM CST | Mesoscale Discussion | SPC | 5 hr |
| Feb 24, 8:48 PM CST | Winter Weather Advisory | LOT | 6 hr |
| Feb 28, 4:10 AM CST | Wind Advisory | LOT | 11 hr |
| Mar 14, 9:16 AM CDT | River Flood Warning | LOT | 3 days |
| Mar 14, 9:19 AM CDT | River Flood Advisory | LOT | 31 hr |
| Mar 15, 3:06 PM CDT | Wind Advisory | LOT | 29 hr |
| Mar 15, 8:07 PM CDT | Mesoscale Discussion | SPC | 53 min |
| Mar 15, 8:40 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Mar 15, 9:21 PM CDT | Severe Thunderstorm Warning | LOT | 39 min |
| Mar 15, 9:52 PM CDT | Severe Thunderstorm Warning | LOT | 38 min |
| Mar 15, 10:22 PM CDT | Tornado Warning | LOT | 23 min |
| Mar 24, 12:54 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Mar 31, 12:36 PM CDT | Mesoscale Discussion | SPC | 84 min |
| Apr 1, 12:16 PM CDT | River Flood Advisory | LOT | 30 hr |
| Apr 1, 2:29 PM CDT | Wind Advisory | LOT | 29 hr |
| Apr 3, 3:57 AM CDT | Wind Advisory | LOT | 15 hr |
| Apr 7, 9:50 AM CDT | River Flood Advisory | LOT | 36 hr |
| Apr 21, 1:29 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| May 10, 10:45 PM CDT | Dense Fog Advisory | LOT | 11 hr |
| May 14, 3:05 AM CDT | Frost Advisory | LOT | 29 hr |
| Jun 9, 7:58 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 20, 1:54 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 20, 3:03 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 20, 6:05 PM CDT | Mesoscale Discussion | SPC | 85 min |
| Jun 22, 3:38 PM CDT | Mesoscale Discussion | SPC | 97 min |
| Jun 22, 6:11 PM CDT | Tornado Watch | SPC | 7 hr |
| Jun 22, 8:53 PM CDT | Mesoscale Discussion | SPC | 97 min |
| Jun 22, 9:53 PM CDT | Areal Flood Advisory | LOT | 4 hr |
| Jun 22, 10:04 PM CDT | Severe Thunderstorm Warning | LOT | 56 min |
| Jun 22, 10:41 PM CDT | Severe Thunderstorm Warning | LOT | 64 min |
| Jun 22, 10:47 PM CDT | Tornado Warning | LOT | 43 min |
| Jun 22, 11:21 PM CDT | Tornado Warning | LOT | 39 min |
| Jun 22, 11:51 PM CDT | Mesoscale Discussion | SPC | 84 min |
| Jun 22, 11:53 PM CDT | Severe Thunderstorm Warning | LOT | 52 min |
| Jun 23, 12:32 AM CDT | Severe Thunderstorm Warning | LOT | 43 min |
| Jun 23, 1:15 AM CDT | Special Weather Statement | LOT | 45 min |
| Jun 23, 1:44 AM CDT | Areal Flood Advisory | LOT | 7 hr |
| Jun 26, 2:39 PM CDT | Mesoscale Discussion | SPC | 96 min |
| Jul 6, 1:27 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 6, 1:55 AM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 6, 4:02 AM CDT | Special Weather Statement | LOT | 43 min |
| Jul 6, 5:04 AM CDT | Mesoscale Discussion | SPC | 116 min |
| Jul 13, 2:37 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 13, 5:08 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 13, 5:37 PM CDT | Severe Thunderstorm Warning | LOT | 53 min |
| Jul 13, 6:28 PM CDT | Severe Thunderstorm Warning | LOT | 47 min |
| Jul 13, 7:18 PM CDT | Areal Flood Warning | LOT | 3 hr |
| Jul 17, 8:06 PM CDT | Mesoscale Discussion | SPC | 84 min |
| Jul 17, 9:02 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jul 17, 9:45 PM CDT | Tornado Warning | LOT | 30 min |
| Jul 17, 9:46 PM CDT | Mesoscale Discussion | SPC | 89 min |
| Jul 17, 11:06 PM CDT | Severe Thunderstorm Warning | LOT | 39 min |
| Jul 17, 11:25 PM CDT | Mesoscale Discussion | SPC | 95 min |
| Jul 18, 12:28 AM CDT | Areal Flood Advisory | LOT | 4 hr |
| Jul 18, 12:53 AM CDT | Flash Flood Warning | LOT | 5 hr |
| Jul 18, 3:26 AM CDT | Areal Flood Advisory | LOT | 3 hr |
| Jul 18, 8:28 AM CDT | River Flood Warning | LOT | 34 hr |
| Jul 18, 10:46 AM CDT | Areal Flood Warning | LOT | 12 hr |
| Jul 18, 3:19 PM CDT | Excessive Heat Watch | LOT | 61 hr |
| Jul 18, 7:48 PM CDT | Areal Flood Advisory | LOT | 3 hr |
| Jul 20, 12:47 PM CDT | Excessive Heat Warning | LOT | 3 days |
| Jul 21, 6:18 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 21, 10:53 PM CDT | Special Weather Statement | LOT | 67 min |
| Jul 21, 11:08 PM CDT | Mesoscale Discussion | SPC | 67 min |
| Jul 24, 3:27 AM CDT | Heat Advisory | LOT | 16 hr |
| Jul 24, 5:42 PM CDT | Mesoscale Discussion | SPC | 93 min |
| Jul 24, 9:05 PM CDT | Special Weather Statement | LOT | 55 min |
| Jul 24, 9:07 PM CDT | Areal Flood Advisory | LOT | 5 hr |
| Aug 14, 9:31 PM CDT | Flash Flood Watch | LOT | 31 hr |
| Aug 15, 5:06 PM CDT | Flash Flood Warning | LOT | 4 hr |
| Aug 15, 11:22 PM CDT | Areal Flood Warning | LOT | 21 hr |
| Aug 18, 3:58 PM CDT | Areal Flood Advisory | LOT | 3 hr |
| Aug 18, 4:18 PM CDT | Special Weather Statement | LOT | 27 min |
| Aug 18, 4:22 PM CDT | Flash Flood Warning | LOT | 5 hr |
| Aug 18, 4:42 PM CDT | Special Weather Statement | LOT | 33 min |
| Aug 18, 7:01 PM CDT | Flash Flood Warning | LOT | 4 hr |
| Aug 18, 7:54 PM CDT | Flash Flood Watch | LOT | 8 hr |
| Aug 19, 1:28 PM CDT | Areal Flood Advisory | LOT | 3 hr |
| Aug 19, 3:38 PM CDT | River Flood Advisory | LOT | 69 hr |
| Aug 20, 9:17 PM CDT | River Flood Warning | LOT | 4 days |
| Aug 24, 9:24 AM CDT | Special Weather Statement | LOT | 51 min |
| Aug 24, 1:20 PM CDT | Mesoscale Discussion | SPC | 85 min |
| Aug 25, 2:52 AM CDT | Special Weather Statement | LOT | 38 min |
| Aug 25, 3:23 AM CDT | Special Weather Statement | LOT | 37 min |
| Aug 28, 12:49 PM CDT | Areal Flood Advisory | LOT | 4 hr |
| Sep 9, 3:05 AM CDT | Dense Fog Advisory | LOT | 6 hr |
| Sep 10, 8:40 AM CDT | River Flood Advisory | LOT | 3 days |
| Sep 10, 2:45 PM CDT | River Flood Advisory | LOT | 36 hr |
| Sep 27, 12:03 PM CDT | Red Flag Warning | LOT | 7 hr |
| Nov 2, 6:30 PM CDT | Special Weather Statement | LOT | 30 min |
| Nov 18, 10:29 AM CST | Wind Advisory | LOT | 29 hr |
| Nov 18, 1:19 PM CST | Mesoscale Discussion | SPC | 116 min |
| Nov 27, 9:21 AM CST | Dense Fog Advisory | LOT | 4 hr |
| Dec 10, 6:59 PM CST | Mesoscale Discussion | SPC | 6 hr |
| Dec 14, 3:24 AM CST | Wind Chill Advisory | LOT | 31 hr |
| Dec 15, 3:17 PM CST | Winter Weather Advisory | LOT | 63 hr |
| Dec 16, 8:27 PM CST | Wind Chill Advisory | LOT | 62 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.