Alert archive / Iowa / Iowa County
Weather alerts in Iowa County, Iowa, 2018
180 weather alerts in 2018, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Iowa County and its neighbors
Each county as a circle sized by its count in 2018. Tap one for its archive.
- Alerts
- 180
- Warnings
- 42
- Watches
- 23
- Advisories
- 44
- Busiest month
- October29 alerts
- Busiest day
- October 9, 201810 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
1 of 9 tornado warnings covering Iowa County in 2018 had a tornado report inside them.
Iowa County, 2018
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 9 | 1 | 89% | 0 | ||
| Severe thunderstorm warnings | 10 | 6 | 40% | 7 | 71% | 33 min |
| Flash flood warnings | 4 | 2 | 50% | 2 | 100% | 296 min |
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 6, 2:50 AM CST | Wind Chill Advisory | DVN | 6 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 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, 8:19 PM CST | Special Weather Statement | DVN | 86 min |
| Jan 21, 4:01 PM CST | Dense Fog Advisory | DVN | 14 hr |
| Jan 22, 8:14 PM CST | River Flood Warning | DVN | 55 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 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, 3:09 PM CST | Winter Weather Advisory | DVN | 18 hr |
| Feb 18, 2:28 AM CST | Dense Fog Advisory | DVN | 8 hr |
| Feb 19, 1:39 PM CST | Dense Fog Advisory | DVN | 13 hr |
| Feb 20, 3:19 PM CST | River Flood Warning | DVN | 4 days |
| Feb 22, 3:23 AM CST | Winter Weather Advisory | DVN | 9 hr |
| Feb 23, 3:13 PM CST | Winter Weather Advisory | DVN | 20 hr |
| Mar 5, 1:48 AM CST | Special Weather Statement | DVN | 87 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 6, 4:40 AM CST | Special Weather Statement | DVN | 80 min |
| Mar 6, 5:51 AM CST | Special Weather Statement | DVN | 84 min |
| Mar 6, 6:51 AM CST | Special Weather Statement | DVN | 114 min |
| Mar 16, 3:10 AM CDT | Winter Weather Advisory | DVN | 32 hr |
| Mar 16, 7:35 PM CDT | Special Weather Statement | DVN | 55 min |
| Mar 16, 8:29 PM CDT | Special Weather Statement | DVN | 91 min |
| Mar 18, 2:25 AM CDT | Dense Fog Advisory | DVN | 9 hr |
| Mar 23, 3:30 AM CDT | Winter Storm Warning | DVN | 40 hr |
| Mar 23, 3:30 AM CDT | Winter Weather Advisory | DVN | 40 hr |
| Mar 31, 6:13 AM CDT | Wind Advisory | DVN | 10 hr |
| Apr 7, 3:08 PM CDT | Winter Weather Advisory | DVN | 43 hr |
| Apr 9, 10:03 AM CDT | Winter Weather Advisory | DVN | 94 min |
| Apr 13, 3:33 PM CDT | River Flood Watch | DVN | 42 hr |
| Apr 13, 5:51 PM CDT | Wind Advisory | DVN | 25 hr |
| Apr 14, 3:51 AM CDT | Winter Weather Advisory | DVN | 39 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 |
| May 1, 7:55 PM CDT | Mesoscale Discussion | SPC | 95 min |
| May 1, 9:38 PM CDT | Mesoscale Discussion | SPC | 67 min |
| May 2, 3:56 PM CDT | Severe Thunderstorm Watch | SPC | 9 hr |
| May 2, 7:18 PM CDT | Severe Thunderstorm Warning | DVN | 57 min |
| May 2, 7:21 PM CDT | Mesoscale Discussion | SPC | 84 min |
| May 3, 9:27 PM CDT | River Flood Watch | DVN | 14 hr |
| May 12, 1:04 AM CDT | Mesoscale Discussion | SPC | 116 min |
| May 12, 2:59 AM CDT | Special Weather Statement | DVN | 61 min |
| May 14, 4:08 AM CDT | Special Weather Statement | DVN | 37 min |
| May 14, 4:41 AM CDT | Special Weather Statement | DVN | 34 min |
| May 22, 3:34 AM CDT | Dense Fog Advisory | DVN | 5 hr |
| May 26, 12:30 AM CDT | Special Weather Statement | DVN | 45 min |
| May 26, 12:35 AM CDT | Severe Thunderstorm Warning | DVN | 40 min |
| May 26, 1:07 AM CDT | Severe Thunderstorm Warning | DVN | 38 min |
| Jun 6, 6:29 PM CDT | Special Weather Statement | DVN | 46 min |
| 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, 8:58 PM CDT | Tornado Warning | DVN | 32 min |
| Jun 9, 9:44 PM CDT | Severe Thunderstorm Warning | DVN | 46 min |
| Jun 9, 10:17 PM CDT | Mesoscale Discussion | SPC | 118 min |
| Jun 9, 10:28 PM CDT | Tornado Warning | DVN | 19 min |
| Jun 9, 10:56 PM CDT | Severe Thunderstorm Warning | DVN | 49 min |
| Jun 9, 11:44 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 12, 12:28 AM CDT | Special Weather Statement | DVN | 62 min |
| Jun 12, 6:31 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 15, 3:25 AM CDT | Heat Advisory | DVN | 4 days |
| Jun 19, 6:12 AM CDT | Special Weather Statement | DVN | 63 min |
| Jun 20, 6:36 AM CDT | Special Weather Statement | DVN | 24 min |
| Jun 20, 10:09 AM CDT | River Flood Watch | DVN | 34 hr |
| Jun 20, 1:01 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 20, 2:14 PM CDT | Special Weather Statement | DVN | 61 min |
| Jun 20, 3:04 PM CDT | Tornado Watch | SPC | 4 hr |
| Jun 20, 3:10 PM CDT | Severe Thunderstorm Warning | DVN | 65 min |
| Jun 20, 5:13 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| 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, 8:09 PM CDT | River Flood Warning | DVN | 24 hr |
| Jun 27, 3:11 PM CDT | Heat Advisory | DVN | 24 hr |
| Jun 28, 3:31 PM CDT | Excessive Heat Warning | DVN | 54 hr |
| Jun 30, 7:15 PM CDT | Mesoscale Discussion | SPC | 90 min |
| Jun 30, 10:06 PM CDT | Flash Flood Watch | DVN | 5 hr |
| Jul 1, 6:30 AM CDT | River Flood Warning | DVN | 4 days |
| Jul 3, 3:48 PM CDT | Heat Advisory | DVN | 28 hr |
| Jul 11, 3:11 PM CDT | Heat Advisory | DVN | 29 hr |
| Jul 13, 3:37 AM CDT | Heat Advisory | DVN | 15 hr |
| Jul 13, 3:21 PM CDT | Special Weather Statement | DVN | 54 min |
| Jul 13, 5:29 PM CDT | Severe Thunderstorm Warning | DVN | 29 min |
| Jul 15, 12:50 PM CDT | Special Weather Statement | DVN | 70 min |
| Jul 15, 2:00 PM CDT | Special Weather Statement | DVN | 90 min |
| Jul 19, 6:50 AM CDT | Special Weather Statement | DVN | 40 min |
| Jul 19, 3:11 PM CDT | Tornado Watch | SPC | 6 hr |
| Jul 19, 5:18 PM CDT | Mesoscale Discussion | SPC | 57 min |
| Jul 25, 10:57 PM CDT | Special Weather Statement | DVN | 63 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 15, 7:00 PM CDT | Special Weather Statement | DVN | 30 min |
| Aug 15, 7:33 PM CDT | Special Weather Statement | DVN | 27 min |
| Aug 15, 7:56 PM CDT | Special Weather Statement | DVN | 34 min |
| Aug 16, 3:00 AM CDT | Dense Fog Advisory | DVN | 6 hr |
| Aug 24, 10:43 PM CDT | Special Weather Statement | DVN | 92 min |
| Aug 25, 4:03 AM CDT | Dense Fog Advisory | DVN | 6 hr |
| Aug 28, 9:08 AM CDT | Flash Flood Watch | DVN | 20 hr |
| Aug 28, 4:45 PM CDT | Mesoscale Discussion | SPC | 60 min |
| Aug 28, 5:06 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 28, 5:14 PM CDT | Severe Thunderstorm Warning | DVN | 61 min |
| Aug 28, 5:40 PM CDT | Tornado Warning | DVN | 35 min |
| Aug 28, 6:02 PM CDT | Tornado Warning | DVN | 28 min |
| Aug 28, 6:07 PM CDT | Mesoscale Discussion | SPC | 53 min |
| Aug 31, 7:12 PM CDT | Special Weather Statement | DVN | 108 min |
| Aug 31, 11:32 PM CDT | Special Weather Statement | DVN | 58 min |
| Sep 1, 12:43 AM CDT | Special Weather Statement | DVN | 62 min |
| Sep 1, 3:29 AM CDT | Flash Flood Warning | DVN | 8 hr |
| Sep 1, 3:44 AM CDT | Flash Flood Watch | DVN | 24 hr |
| Sep 1, 10:01 AM CDT | River Flood Warning | DVN | 15 days |
| Sep 1, 11:27 AM CDT | Areal Flood Warning | DVN | 24 hr |
| Sep 1, 6:34 PM CDT | Mesoscale Discussion | SPC | 56 min |
| Sep 1, 8:20 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Sep 1, 9:52 PM CDT | Special Weather Statement | DVN | 53 min |
| Sep 1, 10:27 PM CDT | Mesoscale Discussion | SPC | 63 min |
| Sep 1, 11:20 PM CDT | Flash Flood Warning | DVN | 4 hr |
| Sep 2, 9:26 AM CDT | Flash Flood Watch | DVN | 39 hr |
| Sep 2, 2:24 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 3, 1:20 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 3, 5:47 PM CDT | Mesoscale Discussion | SPC | 58 min |
| Sep 3, 6:09 PM CDT | Tornado Watch | SPC | 2 hr |
| Sep 3, 7:41 PM CDT | Special Weather Statement | DVN | 64 min |
| Sep 4, 3:56 AM CDT | Flash Flood Watch | DVN | 39 hr |
| Sep 5, 1:01 PM CDT | Flash Flood Warning | DVN | 6 hr |
| Sep 18, 10:41 AM CDT | Special Weather Statement | DVN | 64 min |
| Sep 18, 9:34 PM CDT | River Flood Watch | DVN | 24 hr |
| Sep 19, 2:21 PM CDT | Special Weather Statement | DVN | 54 min |
| Sep 19, 9:48 PM CDT | River Flood Warning | DVN | 35 days |
| Sep 25, 12:48 PM CDT | Severe Thunderstorm Warning | DVN | 42 min |
| Sep 25, 1:07 PM CDT | Mesoscale Discussion | SPC | 113 min |
| Oct 3, 9:46 PM CDT | Special Weather Statement | DVN | 74 min |
| Oct 4, 1:18 PM CDT | Flash Flood Watch | DVN | 48 hr |
| Oct 5, 2:39 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Oct 5, 6:03 PM CDT | Special Weather Statement | DVN | 42 min |
| Oct 5, 7:40 PM CDT | Special Weather Statement | DVN | 50 min |
| Oct 5, 10:02 PM CDT | Flash Flood Warning | DVN | 6 hr |
| Oct 6, 3:54 AM CDT | Areal Flood Warning | DVN | 6 hr |
| Oct 6, 10:12 AM CDT | Areal Flood Warning | DVN | 12 hr |
| Oct 6, 9:59 PM CDT | Areal Flood Warning | DVN | 13 hr |
| Oct 7, 2:44 PM CDT | Flash Flood Watch | DVN | 70 hr |
| Oct 8, 3:34 AM CDT | Special Weather Statement | DVN | 56 min |
| Oct 8, 4:29 AM CDT | Special Weather Statement | DVN | 61 min |
| Oct 8, 10:29 PM CDT | Severe Thunderstorm Warning | DVN | 46 min |
| Oct 9, 12:59 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Oct 9, 1:46 PM CDT | Tornado Watch | SPC | 7 hr |
| Oct 9, 3:06 PM CDT | Tornado Warning | DVN | 39 min |
| Oct 9, 3:38 PM CDT | Tornado Warning | DVN | 52 min |
| Oct 9, 3:53 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Oct 9, 4:03 PM CDT | Tornado Warning | DVN | 27 min |
| Oct 9, 4:31 PM CDT | Tornado Warning | DVN | 44 min |
| Oct 9, 5:14 PM CDT | Tornado Warning | DVN | 46 min |
| Oct 9, 6:37 PM CDT | Mesoscale Discussion | SPC | 83 min |
| Oct 11, 3:40 AM CDT | Frost Advisory | DVN | 28 hr |
| Oct 12, 2:42 PM CDT | Frost Advisory | DVN | 18 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 27, 2:31 PM CDT | Wind Advisory | DVN | 26 hr |
| Oct 30, 12:58 PM CDT | Special Weather Statement | DVN | 32 min |
| Nov 4, 10:48 AM CST | River Flood Watch | DVN | 6 days |
| Nov 4, 7:21 PM CST | River Flood Warning | DVN | 7 days |
| Nov 16, 2:15 PM CST | Winter Weather Advisory | DVN | 18 hr |
| 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 30, 3:37 AM CST | Dense Fog Advisory | DVN | 6 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 4, 7:19 AM CST | Winter Weather Advisory | DVN | 3 hr |
| Dec 11, 12:08 PM CST | Winter Weather Advisory | DVN | 21 hr |
| Dec 26, 10:19 AM CST | River Flood Watch | DVN | 58 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 |
| Dec 28, 7:58 PM CST | River Flood Warning | DVN | 38 hr |
| Dec 30, 3:03 PM CST | Winter Weather Advisory | DVN | 21 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 | 10 |
| Tornado Warning | 9 |
| Severe Thunderstorm Watch | 4 |
| Tornado Watch | 4 |
| Mesoscale Discussion | 28 |
| Special Weather Statement | 43 |
| Flooding | |
| Areal Flood Warning | 4 |
| Flash Flood Warning | 4 |
| River Flood Warning | 8 |
| Flash Flood Watch | 7 |
| River Flood Watch | 6 |
| Winter | |
| Winter Storm Warning | 3 |
| Winter Storm Watch | 2 |
| Winter Weather Advisory | 19 |
| Heat | |
| Excessive Heat Warning | 1 |
| Heat Advisory | 5 |
| Cold | |
| Freeze Warning | 2 |
| Frost Advisory | 2 |
| Wind Chill Advisory | 3 |
| Wind and dust | |
| Wind Advisory | 5 |
| Fire | |
| Red Flag Warning | 1 |
| Fog and smoke | |
| Dense Fog Advisory | 10 |
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.