Alert archive / Illinois / Rock Island County
Weather alerts in Rock Island County, Illinois, 2018
218 weather alerts in 2018, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Rock Island County and its neighbors
Each county as a circle sized by its count in 2018. Tap one for its archive.
- Alerts
- 218
- Warnings
- 60
- Watches
- 33
- Advisories
- 46
- Busiest month
- June40 alerts
- Busiest day
- June 21, 201813 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Rock Island County, 2018
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 13 | 12 | 8% | 8 | 100% | 25 min |
| Flash flood warnings | 3 | 2 | 33% | 0 |
Each office's whole area, 2018
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Quad Cities, IA: tornado warnings | 47 | 14 | 70% | 32 | 59% | 8 min |
| NWS Quad Cities, IA: severe thunderstorm warnings | 136 | 92 | 32% | 249 | 75% | 22 min |
| NWS Quad Cities, IA: flash flood warnings | 29 | 19 | 34% | 39 | 79% | 73 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, 2:50 PM CST | Wind Chill Advisory | DVN | 43 hr |
| Jan 2, 9:18 PM CST | Special Weather Statement | DVN | 117 min |
| Jan 2, 11:20 PM CST | Special Weather Statement | DVN | 115 min |
| Jan 3, 1:25 AM CST | Special Weather Statement | DVN | 2 hr |
| Jan 4, 3:09 PM CST | Wind Chill Advisory | DVN | 19 hr |
| Jan 6, 2:50 AM CST | Wind Chill Advisory | DVN | 6 hr |
| Jan 7, 1:49 PM CST | Mesoscale Discussion | SPC | 4 hr |
| Jan 7, 2:00 PM CST | Mesoscale Discussion | SPC | 4 hr |
| Jan 11, 3:07 AM CST | Winter Weather Advisory | DVN | 17 hr |
| Jan 11, 9:36 AM CST | Mesoscale Discussion | SPC | 4 hr |
| Jan 11, 10:36 AM CST | Special Weather Statement | DVN | 114 min |
| Jan 11, 12:00 PM CST | Special Weather Statement | DVN | 2 hr |
| Jan 14, 2:45 PM CST | Wind Chill Advisory | DVN | 44 hr |
| Jan 14, 2:45 PM CST | Winter Weather Advisory | DVN | 21 hr |
| Jan 14, 4:36 PM CST | Special Weather Statement | DVN | 84 min |
| Jan 21, 4:01 PM CST | Dense Fog Advisory | DVN | 14 hr |
| Jan 29, 10:30 AM CST | Areal Flood Warning | DVN | 24 hr |
| Feb 4, 1:53 PM CST | Winter Weather Advisory | DVN | 32 hr |
| Feb 5, 11:36 AM CST | Mesoscale Discussion | SPC | 6 hr |
| Feb 5, 4:57 PM CST | Mesoscale Discussion | SPC | 4 hr |
| Feb 7, 1:54 PM CST | Winter Storm Watch | DVN | 13 hr |
| Feb 8, 2:59 AM CST | Winter Storm Warning | DVN | 30 hr |
| Feb 8, 2:59 AM CST | Winter Weather Advisory | DVN | 39 hr |
| Feb 9, 3:08 AM CST | Mesoscale Discussion | SPC | 6 hr |
| Feb 9, 3:09 PM CST | Winter Weather Advisory | DVN | 18 hr |
| Feb 10, 3:14 PM CST | Winter Weather Advisory | DVN | 18 hr |
| Feb 14, 5:42 PM CST | Dense Fog Advisory | DVN | 20 hr |
| Feb 18, 2:28 AM CST | Dense Fog Advisory | DVN | 8 hr |
| Feb 18, 10:36 AM CST | River Flood Watch | DVN | 47 hr |
| Feb 18, 10:36 AM CST | River Flood Watch | DVN | 47 hr |
| Feb 20, 9:37 AM CST | Flood Watch | DVN | 6 hr |
| Feb 20, 9:42 AM CST | River Flood Warning | DVN | 16 days |
| Feb 20, 9:42 AM CST | River Flood Warning | DVN | 16 days |
| Feb 23, 3:13 PM CST | Winter Weather Advisory | DVN | 20 hr |
| Feb 24, 9:06 AM CST | Winter Weather Advisory | DVN | 114 min |
| Mar 5, 3:16 AM CST | Special Weather Statement | DVN | 89 min |
| Mar 5, 4:16 AM CST | Special Weather Statement | DVN | 89 min |
| Mar 5, 5:48 AM CST | Special Weather Statement | DVN | 87 min |
| Mar 5, 6:50 AM CST | Winter Weather Advisory | DVN | 17 hr |
| Mar 5, 7:10 AM CST | Special Weather Statement | DVN | 95 min |
| Mar 16, 3:10 AM CDT | Winter Weather Advisory | DVN | 32 hr |
| Mar 16, 8:29 PM CDT | Special Weather Statement | DVN | 91 min |
| Mar 16, 9:33 PM CDT | Special Weather Statement | DVN | 57 min |
| Mar 16, 10:36 PM CDT | Special Weather Statement | DVN | 54 min |
| Mar 18, 2:25 AM CDT | Dense Fog Advisory | DVN | 9 hr |
| Mar 22, 3:45 AM CDT | Winter Storm Watch | DVN | 24 hr |
| Mar 23, 3:30 AM CDT | Winter Storm Warning | DVN | 40 hr |
| Mar 23, 9:27 PM CDT | Winter Storm Warning | DVN | 22 hr |
| Mar 31, 6:13 AM CDT | Wind Advisory | DVN | 10 hr |
| Apr 5, 10:11 AM CDT | Special Weather Statement | DVN | 94 min |
| Apr 13, 5:51 PM CDT | Wind Advisory | DVN | 25 hr |
| Apr 17, 4:07 AM CDT | Winter Weather Advisory | DVN | 45 hr |
| Apr 27, 2:50 PM CDT | Red Flag Warning | DVN | 5 hr |
| Apr 29, 1:49 PM CDT | River Flood Warning | DVN | 19 days |
| Apr 29, 1:49 PM CDT | River Flood Warning | DVN | 20 days |
| Apr 30, 11:08 AM CDT | River Flood Watch | DVN | 35 hr |
| May 1, 4:28 PM CDT | River Flood Watch | DVN | 24 hr |
| May 1, 10:01 PM CDT | River Flood Warning | DVN | 15 days |
| May 1, 10:01 PM CDT | River Flood Warning | DVN | 18 days |
| May 1, 10:01 PM CDT | River Flood Warning | DVN | 19 days |
| May 2, 1:33 PM CDT | Mesoscale Discussion | SPC | 117 min |
| May 2, 3:56 PM CDT | Severe Thunderstorm Watch | SPC | 9 hr |
| May 2, 7:21 PM CDT | Mesoscale Discussion | SPC | 84 min |
| May 2, 9:51 PM CDT | Special Weather Statement | DVN | 24 min |
| May 2, 10:01 PM CDT | Mesoscale Discussion | SPC | 89 min |
| May 2, 10:18 PM CDT | Special Weather Statement | DVN | 87 min |
| May 9, 2:26 AM CDT | Special Weather Statement | DVN | 49 min |
| May 11, 10:42 AM CDT | Special Weather Statement | DVN | 33 min |
| May 12, 1:04 AM CDT | Mesoscale Discussion | SPC | 116 min |
| May 12, 4:27 AM CDT | Special Weather Statement | DVN | 63 min |
| May 12, 5:24 AM CDT | Special Weather Statement | DVN | 66 min |
| May 14, 4:53 AM CDT | Special Weather Statement | DVN | 52 min |
| May 14, 2:39 PM CDT | Special Weather Statement | DVN | 36 min |
| May 14, 2:54 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 14, 3:17 PM CDT | Special Weather Statement | DVN | 28 min |
| May 15, 5:26 AM CDT | Special Weather Statement | DVN | 34 min |
| May 25, 2:33 PM CDT | Severe Thunderstorm Warning | DVN | 27 min |
| May 27, 2:49 PM CDT | Severe Thunderstorm Warning | DVN | 16 min |
| May 27, 3:47 PM CDT | Mesoscale Discussion | SPC | 118 min |
| May 27, 4:20 PM CDT | Severe Thunderstorm Warning | DVN | 18 min |
| May 29, 10:25 PM CDT | Special Weather Statement | DVN | 50 min |
| Jun 9, 12:16 AM CDT | Severe Thunderstorm Warning | DVN | 44 min |
| Jun 9, 12:43 AM CDT | Flash Flood Warning | DVN | 2 hr |
| Jun 9, 4:28 AM CDT | Severe Thunderstorm Warning | DVN | 47 min |
| Jun 9, 3:01 PM CDT | Flash Flood Watch | DVN | 16 hr |
| Jun 9, 6:30 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 9, 7:43 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 9, 10:17 PM CDT | Mesoscale Discussion | SPC | 118 min |
| Jun 9, 11:44 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 10, 9:44 AM CDT | River Flood Warning | DVN | 4 days |
| Jun 10, 9:47 AM CDT | River Flood Watch | DVN | 10 hr |
| Jun 10, 10:39 AM CDT | Special Weather Statement | DVN | 51 min |
| Jun 10, 7:38 PM CDT | River Flood Warning | DVN | 4 days |
| Jun 15, 3:25 AM CDT | Heat Advisory | DVN | 4 days |
| Jun 17, 3:01 PM CDT | Excessive Heat Warning | DVN | 28 hr |
| Jun 19, 9:13 AM CDT | River Flood Watch | DVN | 12 hr |
| Jun 19, 9:13 AM CDT | River Flood Watch | DVN | 35 hr |
| Jun 19, 8:51 PM CDT | River Flood Warning | DVN | 14 days |
| Jun 20, 4:49 PM CDT | Special Weather Statement | DVN | 56 min |
| Jun 20, 5:13 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 20, 5:39 PM CDT | Flash Flood Warning | DVN | 3 hr |
| Jun 20, 8:21 PM CDT | River Flood Warning | DVN | 13 days |
| Jun 20, 9:42 PM CDT | River Flood Watch | DVN | 24 hr |
| Jun 20, 9:42 PM CDT | River Flood Watch | DVN | 24 hr |
| Jun 21, 3:47 AM CDT | Flash Flood Watch | DVN | 23 hr |
| Jun 21, 11:16 AM CDT | River Flood Warning | DVN | 15 days |
| Jun 21, 11:16 AM CDT | River Flood Warning | DVN | 15 days |
| Jun 21, 11:16 AM CDT | River Flood Warning | DVN | 16 days |
| Jun 21, 11:32 AM CDT | River Flood Watch | DVN | 24 hr |
| Jun 21, 11:40 AM CDT | Special Weather Statement | DVN | 20 min |
| Jun 21, 12:11 PM CDT | Special Weather Statement | DVN | 49 min |
| Jun 21, 1:22 PM CDT | Special Weather Statement | DVN | 53 min |
| Jun 21, 1:53 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 21, 2:05 PM CDT | River Flood Watch | DVN | 24 hr |
| Jun 22, 10:59 AM CDT | River Flood Warning | DVN | 12 days |
| Jun 22, 8:52 PM CDT | River Flood Watch | DVN | 5 days |
| Jun 23, 7:46 PM CDT | Special Weather Statement | DVN | 59 min |
| Jun 26, 4:28 PM CDT | Special Weather Statement | DVN | 32 min |
| Jun 27, 10:39 AM CDT | River Flood Warning | DVN | 8 days |
| Jun 27, 3:11 PM CDT | Heat Advisory | DVN | 24 hr |
| Jun 28, 3:31 PM CDT | Excessive Heat Warning | DVN | 54 hr |
| Jul 3, 3:48 PM CDT | Heat Advisory | DVN | 28 hr |
| Jul 13, 3:37 AM CDT | Heat Advisory | DVN | 15 hr |
| Jul 13, 5:37 PM CDT | Severe Thunderstorm Warning | DVN | 38 min |
| Jul 13, 6:01 PM CDT | Severe Thunderstorm Warning | DVN | 44 min |
| Jul 13, 7:37 PM CDT | Special Weather Statement | DVN | 38 min |
| Jul 13, 8:06 PM CDT | Special Weather Statement | DVN | 54 min |
| Jul 14, 5:26 PM CDT | Special Weather Statement | DVN | 34 min |
| Jul 14, 6:35 PM CDT | Special Weather Statement | DVN | 85 min |
| Jul 19, 5:18 PM CDT | Mesoscale Discussion | SPC | 57 min |
| Jul 25, 11:41 PM CDT | Special Weather Statement | DVN | 49 min |
| Aug 5, 5:44 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 8, 4:07 AM CDT | Dense Fog Advisory | DVN | 5 hr |
| Aug 16, 3:00 AM CDT | Dense Fog Advisory | DVN | 6 hr |
| Aug 16, 7:21 PM CDT | Special Weather Statement | DVN | 24 min |
| Aug 17, 6:41 AM CDT | Dense Fog Advisory | DVN | 2 hr |
| Aug 25, 1:41 PM CDT | Heat Advisory | DVN | 5 hr |
| Aug 26, 3:03 AM CDT | Heat Advisory | DVN | 64 hr |
| Aug 28, 9:08 AM CDT | Flash Flood Watch | DVN | 20 hr |
| Aug 28, 1:50 PM CDT | Special Weather Statement | DVN | 25 min |
| Aug 28, 2:16 PM CDT | Special Weather Statement | DVN | 59 min |
| Aug 28, 5:06 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 28, 5:59 PM CDT | Severe Thunderstorm Warning | DVN | 61 min |
| Aug 28, 6:41 PM CDT | Severe Thunderstorm Warning | DVN | 64 min |
| Aug 28, 6:45 PM CDT | Severe Thunderstorm Warning | DVN | 60 min |
| Sep 1, 3:44 AM CDT | Flash Flood Watch | DVN | 24 hr |
| Sep 1, 6:34 PM CDT | Mesoscale Discussion | SPC | 56 min |
| Sep 1, 9:33 PM CDT | Special Weather Statement | DVN | 42 min |
| Sep 1, 9:36 PM CDT | Special Weather Statement | DVN | 39 min |
| Sep 1, 10:27 PM CDT | Mesoscale Discussion | SPC | 63 min |
| Sep 1, 11:29 PM CDT | Special Weather Statement | DVN | 46 min |
| Sep 2, 8:53 AM CDT | River Flood Warning | DVN | 25 days |
| Sep 2, 8:53 AM CDT | River Flood Warning | DVN | 14 days |
| Sep 2, 9:26 AM CDT | Flash Flood Watch | DVN | 39 hr |
| Sep 3, 1:20 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 3, 4:21 PM CDT | Special Weather Statement | DVN | 24 min |
| Sep 4, 3:56 AM CDT | Flash Flood Watch | DVN | 39 hr |
| Sep 4, 11:21 AM CDT | River Flood Warning | DVN | 9 days |
| Sep 4, 11:21 AM CDT | River Flood Warning | DVN | 11 days |
| Sep 4, 11:21 AM CDT | River Flood Warning | DVN | 12 days |
| Sep 6, 7:51 AM CDT | Special Weather Statement | DVN | 114 min |
| Sep 18, 11:47 AM CDT | Severe Thunderstorm Warning | DVN | 58 min |
| Sep 19, 3:52 PM CDT | Special Weather Statement | DVN | 23 min |
| Sep 21, 1:11 AM CDT | Special Weather Statement | DVN | 79 min |
| Sep 25, 1:07 PM CDT | Mesoscale Discussion | SPC | 113 min |
| Sep 25, 1:36 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Sep 25, 2:27 PM CDT | Severe Thunderstorm Warning | DVN | 63 min |
| Sep 25, 3:14 PM CDT | Severe Thunderstorm Warning | DVN | 61 min |
| Sep 25, 3:39 PM CDT | Mesoscale Discussion | SPC | 96 min |
| Oct 1, 3:23 PM CDT | River Flood Warning | DVN | 29 days |
| Oct 1, 10:23 PM CDT | River Flood Warning | DVN | 26 days |
| Oct 1, 10:23 PM CDT | River Flood Warning | DVN | 28 days |
| Oct 3, 11:07 AM CDT | River Flood Warning | DVN | 3 days |
| Oct 3, 11:07 AM CDT | River Flood Warning | DVN | 24 days |
| Oct 3, 10:18 PM CDT | Special Weather Statement | DVN | 72 min |
| Oct 4, 10:10 AM CDT | River Flood Warning | DVN | 20 days |
| Oct 4, 1:18 PM CDT | Flash Flood Watch | DVN | 48 hr |
| Oct 7, 2:44 PM CDT | Flash Flood Watch | DVN | 70 hr |
| Oct 7, 9:16 PM CDT | River Flood Watch | DVN | 15 hr |
| Oct 8, 11:49 AM CDT | River Flood Warning | DVN | 17 days |
| Oct 8, 11:49 AM CDT | River Flood Warning | DVN | 6 days |
| Oct 9, 3:42 AM CDT | Flash Flood Watch | DVN | 33 hr |
| Oct 9, 2:45 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Oct 10, 1:25 AM CDT | Special Weather Statement | DVN | 65 min |
| Oct 10, 6:48 AM CDT | Flash Flood Warning | DVN | 6 hr |
| Oct 11, 3:40 AM CDT | Frost Advisory | DVN | 28 hr |
| Oct 12, 2:42 PM CDT | Frost Advisory | DVN | 18 hr |
| Oct 13, 6:52 AM CDT | Dense Fog Advisory | DVN | 2 hr |
| Oct 14, 3:21 PM CDT | Freeze Warning | DVN | 18 hr |
| Oct 15, 3:14 AM CDT | Freeze Warning | DVN | 30 hr |
| Oct 19, 7:36 PM CDT | Wind Advisory | DVN | 20 hr |
| Oct 21, 11:08 AM CDT | River Flood Warning | DVN | 3 days |
| Oct 27, 2:31 PM CDT | Wind Advisory | DVN | 26 hr |
| Nov 1, 9:23 AM CDT | River Flood Warning | DVN | 28 hr |
| Nov 9, 2:22 PM CST | Special Weather Statement | DVN | 53 min |
| Nov 23, 3:29 AM CST | Winter Storm Watch | DVN | 24 hr |
| Nov 24, 3:52 AM CST | Winter Storm Warning | DVN | 44 hr |
| Nov 25, 11:54 AM CST | Mesoscale Discussion | SPC | 6 hr |
| Nov 25, 12:09 PM CST | Blizzard Warning | DVN | 18 hr |
| Nov 25, 6:54 PM CST | Mesoscale Discussion | SPC | 6 hr |
| Nov 26, 3:15 PM CST | Special Weather Statement | DVN | 45 min |
| Nov 30, 3:37 AM CST | Dense Fog Advisory | DVN | 6 hr |
| Nov 30, 10:43 AM CST | River Flood Watch | DVN | 58 hr |
| Nov 30, 10:43 AM CST | River Flood Watch | DVN | 58 hr |
| Dec 1, 7:28 AM CST | Wind Advisory | DVN | 7 hr |
| Dec 1, 12:36 PM CST | Dense Fog Advisory | DVN | 20 hr |
| Dec 2, 8:32 PM CST | River Flood Warning | DVN | 4 days |
| Dec 2, 8:32 PM CST | River Flood Warning | DVN | 4 days |
| Dec 4, 7:19 AM CST | Winter Weather Advisory | DVN | 3 hr |
| Dec 4, 7:01 PM CST | Special Weather Statement | DVN | 119 min |
| Dec 4, 10:08 PM CST | Special Weather Statement | DVN | 82 min |
| Dec 10, 12:42 AM CST | Dense Fog Advisory | DVN | 9 hr |
| Dec 11, 12:08 PM CST | Winter Weather Advisory | DVN | 21 hr |
| Dec 13, 4:56 PM CST | Dense Fog Advisory | DVN | 3 hr |
| Dec 13, 11:58 PM CST | Dense Fog Advisory | DVN | 9 hr |
| Dec 14, 3:57 PM CST | Dense Fog Advisory | DVN | 11 hr |
| Dec 28, 2:50 AM CST | Winter Weather Advisory | DVN | 9 hr |
| Dec 28, 2:37 PM CST | Winter Weather Advisory | DVN | 7 hr |
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
| Product | Alerts |
|---|---|
| Severe storms | |
| Severe Thunderstorm Warning | 13 |
| Severe Thunderstorm Watch | 5 |
| Mesoscale Discussion | 26 |
| Special Weather Statement | 53 |
| Flooding | |
| Areal Flood Warning | 1 |
| Flash Flood Warning | 3 |
| River Flood Warning | 33 |
| Flash Flood Watch | 9 |
| Flood Watch | 1 |
| River Flood Watch | 15 |
| Winter | |
| Blizzard Warning | 1 |
| Winter Storm Warning | 4 |
| Winter Storm Watch | 3 |
| Winter Weather Advisory | 15 |
| Heat | |
| Excessive Heat Warning | 2 |
| Heat Advisory | 6 |
| Cold | |
| Freeze Warning | 2 |
| Frost Advisory | 2 |
| Wind Chill Advisory | 4 |
| Wind and dust | |
| Wind Advisory | 5 |
| Fire | |
| Red Flag Warning | 1 |
| Fog and smoke | |
| Dense Fog Advisory | 14 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20172019
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.