Alert archive / Iowa / Iowa County
Weather alerts in Iowa County, Iowa, 2016
107 weather alerts in 2016, 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 2016. Tap one for its archive.
- Alerts
- 107
- Warnings
- 22
- Watches
- 18
- Advisories
- 25
- Busiest month
- July19 alerts
- Busiest day
- August 12, 20168 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Iowa County, 2016
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 6 | 6 | 0% | 2 | 50% | 0 min |
| Flash flood warnings | 4 | 3 | 25% | 3 | 67% | 177 min |
Each office's whole area, 2016
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Quad Cities, IA: tornado warnings | 31 | 16 | 48% | 33 | 61% | 18 min |
| NWS Quad Cities, IA: severe thunderstorm warnings | 90 | 70 | 22% | 249 | 71% | 24 min |
| NWS Quad Cities, IA: flash flood warnings | 29 | 18 | 38% | 44 | 75% | 87 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, 6:21 AM CST | Dense Fog Advisory | DVN | 17 hr |
| Jan 9, 3:22 AM CST | Wind Chill Advisory | DVN | 33 hr |
| Jan 12, 6:03 AM CST | Wind Chill Advisory | DVN | 6 hr |
| Jan 16, 3:14 PM CST | Wind Chill Advisory | DVN | 45 hr |
| Jan 31, 3:23 AM CST | Winter Storm Watch | DVN | 24 hr |
| Feb 1, 3:48 AM CST | Winter Weather Advisory | DVN | 35 hr |
| Feb 1, 10:03 AM CST | Dense Fog Advisory | DVN | 4 hr |
| Feb 1, 9:14 PM CST | Dense Fog Advisory | DVN | 6 hr |
| Feb 2, 5:31 PM CST | Dense Fog Advisory | DVN | 9 hr |
| Feb 13, 3:38 AM CST | Winter Weather Advisory | DVN | 38 hr |
| Feb 15, 4:30 AM CST | Dense Fog Advisory | DVN | 6 hr |
| Feb 18, 3:49 PM CST | Wind Advisory | DVN | 26 hr |
| Feb 19, 9:55 AM CST | High Wind Warning | DVN | 8 hr |
| Feb 19, 10:15 AM CST | River Flood Warning | DVN | 7 days |
| Mar 14, 12:59 AM CDT | Dense Fog Advisory | DVN | 9 hr |
| Mar 15, 3:48 AM CDT | High Wind Watch | DVN | 12 hr |
| Mar 15, 3:27 PM CDT | Wind Advisory | DVN | 29 hr |
| Apr 1, 3:28 PM CDT | Wind Advisory | DVN | 28 hr |
| Apr 3, 4:18 AM CDT | Wind Advisory | DVN | 17 hr |
| Apr 7, 3:45 PM CDT | Freeze Watch | DVN | 12 hr |
| Apr 8, 3:16 AM CDT | Freeze Warning | DVN | 30 hr |
| Apr 11, 9:42 AM CDT | Freeze Warning | DVN | 23 hr |
| May 25, 7:46 AM CDT | Special Weather Statement | DVN | 59 min |
| May 26, 4:59 AM CDT | Severe Thunderstorm Warning | DVN | 31 min |
| May 27, 8:37 PM CDT | Flash Flood Warning | DVN | 6 hr |
| May 28, 12:37 PM CDT | Mesoscale Discussion | SPC | 113 min |
| May 28, 1:37 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 28, 5:33 PM CDT | Mesoscale Discussion | SPC | 57 min |
| May 31, 6:50 PM CDT | Special Weather Statement | DVN | 55 min |
| May 31, 8:13 PM CDT | Special Weather Statement | DVN | 62 min |
| Jun 1, 3:35 AM CDT | Dense Fog Advisory | DVN | 4 hr |
| Jun 4, 1:01 AM CDT | Special Weather Statement | DVN | 44 min |
| Jun 11, 1:29 AM CDT | Special Weather Statement | DVN | 46 min |
| Jun 14, 11:45 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 14, 3:49 PM CDT | Mesoscale Discussion | SPC | 56 min |
| Jun 14, 8:36 PM CDT | Mesoscale Discussion | SPC | 84 min |
| Jun 21, 2:33 PM CDT | Flash Flood Watch | DVN | 19 hr |
| Jun 21, 10:28 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 21, 11:13 PM CDT | Special Weather Statement | DVN | 32 min |
| Jun 21, 11:18 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 22, 1:37 AM CDT | Flash Flood Warning | DVN | 6 hr |
| Jun 22, 2:31 AM CDT | Mesoscale Discussion | SPC | 119 min |
| Jun 22, 6:11 PM CDT | Tornado Watch | SPC | 7 hr |
| Jun 25, 9:57 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 26, 3:32 AM CDT | Special Weather Statement | DVN | 43 min |
| Jun 26, 4:19 AM CDT | Special Weather Statement | DVN | 41 min |
| Jun 30, 1:29 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 5, 9:50 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 5, 10:46 PM CDT | Mesoscale Discussion | SPC | 89 min |
| Jul 6, 1:27 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 6, 1:51 AM CDT | Special Weather Statement | DVN | 54 min |
| Jul 7, 12:30 AM CDT | Mesoscale Discussion | SPC | 90 min |
| Jul 10, 7:34 AM CDT | Mesoscale Discussion | SPC | 86 min |
| Jul 10, 10:19 AM CDT | Special Weather Statement | DVN | 56 min |
| Jul 13, 11:14 AM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 13, 1:28 PM CDT | Severe Thunderstorm Warning | DVN | 47 min |
| Jul 13, 1:44 PM CDT | Special Weather Statement | DVN | 61 min |
| Jul 13, 2:01 PM CDT | Severe Thunderstorm Warning | DVN | 59 min |
| Jul 17, 4:37 AM CDT | Severe Thunderstorm Warning | DVN | 53 min |
| Jul 17, 5:31 AM CDT | Severe Thunderstorm Warning | DVN | 44 min |
| Jul 18, 4:27 AM CDT | Special Weather Statement | DVN | 33 min |
| Jul 18, 3:37 PM CDT | Excessive Heat Watch | DVN | 44 hr |
| Jul 20, 4:00 AM CDT | Excessive Heat Warning | DVN | 4 days |
| Jul 22, 2:39 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 23, 2:08 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 23, 3:23 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 4, 12:15 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 4, 4:44 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 4, 8:19 PM CDT | Severe Thunderstorm Warning | DVN | 56 min |
| Aug 11, 3:08 AM CDT | Flash Flood Watch | DVN | 30 hr |
| Aug 11, 6:17 PM CDT | Mesoscale Discussion | SPC | 58 min |
| Aug 11, 8:16 PM CDT | Special Weather Statement | DVN | 59 min |
| Aug 11, 8:57 PM CDT | Special Weather Statement | DVN | 93 min |
| Aug 11, 9:07 PM CDT | Mesoscale Discussion | SPC | 53 min |
| Aug 11, 9:31 PM CDT | Flash Flood Warning | DVN | 6 hr |
| Aug 11, 9:53 PM CDT | River Flood Watch | DVN | 4 days |
| Aug 11, 10:33 PM CDT | Special Weather Statement | DVN | 87 min |
| Aug 12, 8:50 AM CDT | River Flood Warning | DVN | 4 days |
| Aug 12, 10:05 AM CDT | Areal Flood Warning | DVN | 9 hr |
| Aug 24, 7:09 PM CDT | Special Weather Statement | DVN | 66 min |
| Sep 6, 3:25 PM CDT | Flash Flood Watch | DVN | 39 hr |
| Sep 8, 12:41 AM CDT | Special Weather Statement | DVN | 64 min |
| Sep 15, 9:23 PM CDT | River Flood Watch | DVN | 24 hr |
| Sep 16, 3:16 PM CDT | River Flood Warning | DVN | 23 days |
| Sep 19, 2:02 PM CDT | Mesoscale Discussion | SPC | 58 min |
| Sep 19, 2:55 PM CDT | Tornado Watch | SPC | 4 hr |
| Sep 19, 5:07 PM CDT | Mesoscale Discussion | SPC | 113 min |
| Sep 21, 2:00 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 23, 4:24 AM CDT | Special Weather Statement | DVN | 51 min |
| Sep 23, 4:33 AM CDT | Flash Flood Warning | DVN | 6 hr |
| Oct 12, 3:45 AM CDT | Freeze Warning | DVN | 29 hr |
| Oct 20, 2:17 PM CDT | Frost Advisory | DVN | 18 hr |
| Nov 1, 11:46 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Nov 15, 5:04 AM CST | Dense Fog Advisory | DVN | 6 hr |
| Nov 18, 11:12 AM CST | Wind Advisory | DVN | 25 hr |
| Nov 28, 4:28 PM CST | Mesoscale Discussion | SPC | 92 min |
| Nov 28, 5:21 PM CST | Special Weather Statement | DVN | 24 min |
| Dec 3, 2:44 PM CST | Winter Weather Advisory | DVN | 24 hr |
| Dec 5, 3:47 AM CST | Dense Fog Advisory | DVN | 9 hr |
| Dec 9, 11:09 AM CST | Winter Weather Advisory | DVN | 58 hr |
| Dec 15, 11:34 AM CST | Winter Weather Advisory | DVN | 60 hr |
| Dec 16, 3:37 PM CST | Wind Chill Warning | DVN | 44 hr |
| Dec 16, 3:37 PM CST | Wind Chill Advisory | DVN | 66 hr |
| Dec 25, 8:48 PM CST | River Flood Warning | DVN | 6 days |
| Dec 26, 1:11 AM CST | River Flood Watch | DVN | 6 days |
| Dec 27, 11:05 AM CST | River Flood Warning | DVN | 5 days |
| Dec 29, 3:34 AM CST | Wind Advisory | DVN | 13 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.