Alert archive / Iowa / Iowa County
Weather alerts in Iowa County, Iowa, 2015
124 weather alerts in 2015, 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 2015. Tap one for its archive.
- Alerts
- 124
- Warnings
- 31
- Watches
- 21
- Advisories
- 25
- Busiest month
- June28 alerts
- Busiest day
- June 20, 20156 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 1 tornado warnings covering Iowa County in 2015 had a tornado report inside them.
Iowa County, 2015
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 1 | 1 | 0% | 0 | ||
| Severe thunderstorm warnings | 4 | 0 | 100% | 1 | 0% | |
| Flash flood warnings | 3 | 3 | 0% | 2 | 100% | 41 min |
Each office's whole area, 2015
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Quad Cities, IA: tornado warnings | 25 | 8 | 68% | 42 | 50% | 17 min |
| NWS Quad Cities, IA: severe thunderstorm warnings | 131 | 86 | 34% | 316 | 72% | 20 min |
| NWS Quad Cities, IA: flash flood warnings | 30 | 23 | 23% | 60 | 88% | 65 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 4, 3:06 AM CST | Wind Chill Advisory | DVN | 31 hr |
| Jan 4, 3:17 AM CST | Winter Storm Watch | DVN | 13 hr |
| Jan 4, 3:56 PM CST | Winter Storm Warning | DVN | 34 hr |
| Jan 5, 12:25 PM CST | Mesoscale Discussion | SPC | 6 hr |
| Jan 5, 6:29 PM CST | Mesoscale Discussion | SPC | 5 hr |
| Jan 6, 3:42 AM CST | Wind Chill Warning | DVN | 36 hr |
| Jan 7, 3:21 PM CST | Wind Chill Advisory | DVN | 21 hr |
| Jan 8, 2:03 PM CST | Winter Weather Advisory | DVN | 18 hr |
| Jan 8, 9:04 PM CST | Wind Chill Advisory | DVN | 36 hr |
| Jan 30, 10:38 AM CST | Winter Storm Watch | DVN | 17 hr |
| Jan 31, 3:53 AM CST | Winter Storm Warning | DVN | 44 hr |
| Jan 31, 10:13 PM CST | Mesoscale Discussion | SPC | 6 hr |
| Feb 14, 3:07 AM CST | Wind Chill Advisory | DVN | 26 hr |
| Feb 17, 3:21 AM CST | Wind Chill Advisory | DVN | 56 hr |
| Feb 22, 4:21 AM CST | Wind Chill Advisory | DVN | 30 hr |
| Feb 24, 3:03 PM CST | Winter Weather Advisory | DVN | 39 hr |
| Feb 25, 4:31 AM CST | Winter Storm Warning | DVN | 22 hr |
| Feb 26, 3:14 PM CST | Wind Chill Advisory | DVN | 18 hr |
| Feb 27, 3:00 PM CST | Wind Chill Advisory | DVN | 18 hr |
| Mar 2, 3:12 PM CST | Winter Weather Advisory | DVN | 21 hr |
| Mar 10, 1:42 AM CDT | Dense Fog Advisory | DVN | 10 hr |
| Mar 31, 3:59 PM CDT | Fire Weather Watch | DVN | 12 hr |
| Apr 1, 3:42 AM CDT | Red Flag Warning | DVN | 15 hr |
| Apr 9, 12:29 PM CDT | Mesoscale Discussion | SPC | 91 min |
| Apr 9, 12:58 PM CDT | Tornado Watch | SPC | 6 hr |
| Apr 9, 3:12 PM CDT | Mesoscale Discussion | SPC | 93 min |
| Apr 9, 6:39 PM CDT | Special Weather Statement | DVN | 2 hr |
| Apr 10, 1:09 PM CDT | Wind Advisory | DVN | 6 hr |
| Apr 20, 9:05 AM CDT | Special Weather Statement | DVN | 3 hr |
| Apr 20, 11:49 AM CDT | Special Weather Statement | DVN | 3 hr |
| Apr 20, 2:39 PM CDT | Special Weather Statement | DVN | 3 hr |
| Apr 21, 4:12 AM CDT | Wind Advisory | DVN | 15 hr |
| Apr 22, 3:19 PM CDT | Freeze Warning | DVN | 17 hr |
| May 7, 3:43 PM CDT | Special Weather Statement | DVN | 47 min |
| May 10, 5:17 PM CDT | Mesoscale Discussion | SPC | 88 min |
| May 24, 3:34 PM CDT | Mesoscale Discussion | SPC | 56 min |
| Jun 7, 1:56 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 7, 3:28 AM CDT | Special Weather Statement | DVN | 47 min |
| Jun 11, 10:56 AM CDT | Flash Flood Watch | DVN | 18 hr |
| Jun 11, 11:09 AM CDT | River Flood Warning | DVN | 8 days |
| Jun 11, 8:45 PM CDT | Flash Flood Warning | DVN | 6 hr |
| Jun 11, 10:08 PM CDT | Flash Flood Warning | DVN | 6 hr |
| Jun 12, 1:23 AM CDT | River Flood Warning | DVN | 8 days |
| Jun 15, 7:37 AM CDT | Flash Flood Watch | DVN | 13 hr |
| Jun 20, 12:48 PM CDT | Mesoscale Discussion | SPC | 117 min |
| Jun 20, 3:10 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 20, 3:49 PM CDT | Tornado Watch | SPC | 7 hr |
| Jun 20, 5:18 PM CDT | Severe Thunderstorm Warning | DVN | 27 min |
| Jun 20, 5:41 PM CDT | Severe Thunderstorm Warning | DVN | 49 min |
| Jun 20, 6:33 PM CDT | Mesoscale Discussion | SPC | 57 min |
| Jun 20, 9:19 PM CDT | River Flood Warning | DVN | 4 days |
| Jun 20, 10:12 PM CDT | Mesoscale Discussion | SPC | 63 min |
| Jun 21, 1:45 AM CDT | Dense Fog Advisory | DVN | 7 hr |
| Jun 22, 7:42 AM CDT | Mesoscale Discussion | SPC | 93 min |
| Jun 22, 8:08 AM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jun 22, 1:22 PM CDT | Mesoscale Discussion | SPC | 113 min |
| Jun 22, 3:56 PM CDT | Tornado Watch | SPC | 9 hr |
| Jun 22, 6:08 PM CDT | Mesoscale Discussion | SPC | 67 min |
| Jun 22, 8:16 PM CDT | Mesoscale Discussion | SPC | 59 min |
| Jun 23, 3:39 PM CDT | Flash Flood Watch | DVN | 42 hr |
| Jun 24, 10:44 AM CDT | River Flood Warning | DVN | 8 days |
| Jun 24, 2:17 PM CDT | Special Weather Statement | DVN | 43 min |
| Jun 24, 9:26 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 29, 4:31 AM CDT | Dense Fog Advisory | DVN | 4 hr |
| Jul 7, 9:50 PM CDT | River Flood Warning | DVN | 4 days |
| Jul 11, 2:15 PM CDT | Flash Flood Watch | DVN | 11 hr |
| Jul 12, 3:24 PM CDT | Heat Advisory | DVN | 29 hr |
| Jul 13, 2:20 PM CDT | Excessive Heat Warning | DVN | 6 hr |
| Jul 16, 3:54 AM CDT | Flash Flood Watch | DVN | 21 hr |
| Jul 16, 3:41 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 17, 3:16 AM CDT | Heat Advisory | DVN | 33 hr |
| Jul 18, 12:31 PM CDT | Mesoscale Discussion | SPC | 119 min |
| Jul 25, 3:02 AM CDT | Heat Advisory | DVN | 9 hr |
| Jul 26, 1:13 AM CDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 27, 12:40 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 28, 10:14 AM CDT | Special Weather Statement | DVN | 2 hr |
| Jul 28, 3:24 PM CDT | Flash Flood Watch | DVN | 12 hr |
| Jul 28, 3:44 PM CDT | Special Weather Statement | DVN | 46 min |
| Jul 28, 4:45 PM CDT | Severe Thunderstorm Warning | DVN | 30 min |
| Jul 28, 4:57 PM CDT | Special Weather Statement | DVN | 33 min |
| Jul 28, 5:46 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 28, 8:04 PM CDT | Mesoscale Discussion | SPC | 116 min |
| Jul 28, 9:09 PM CDT | River Flood Warning | DVN | 5 days |
| Aug 2, 8:09 PM CDT | Special Weather Statement | DVN | 36 min |
| Aug 2, 8:30 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Aug 9, 4:19 AM CDT | Flash Flood Warning | DVN | 6 hr |
| Aug 9, 9:28 AM CDT | River Flood Warning | DVN | 64 hr |
| Aug 9, 9:52 AM CDT | Areal Flood Warning | DVN | 14 hr |
| Aug 10, 12:40 AM CDT | Special Weather Statement | DVN | 35 min |
| Aug 30, 12:40 AM CDT | Dense Fog Advisory | DVN | 10 hr |
| Aug 30, 9:25 AM CDT | River Flood Warning | DVN | 8 days |
| Aug 30, 7:14 PM CDT | Dense Fog Advisory | DVN | 11 hr |
| Sep 7, 3:24 AM CDT | Flash Flood Watch | DVN | 28 hr |
| Sep 17, 10:58 AM CDT | Special Weather Statement | DVN | 92 min |
| Sep 17, 11:00 AM CDT | Special Weather Statement | DVN | 90 min |
| Oct 15, 3:08 PM CDT | Freeze Watch | DVN | 13 hr |
| Oct 16, 3:45 AM CDT | Freeze Warning | DVN | 29 hr |
| Oct 18, 2:15 PM CDT | Red Flag Warning | DVN | 29 hr |
| Oct 20, 3:45 PM CDT | Special Weather Statement | DVN | 45 min |
| Oct 20, 5:15 PM CDT | Special Weather Statement | DVN | 30 min |
| Nov 5, 3:17 PM CST | Mesoscale Discussion | SPC | 118 min |
| Nov 5, 6:57 PM CST | Special Weather Statement | DVN | 63 min |
| Nov 5, 7:56 PM CST | Special Weather Statement | DVN | 49 min |
| Nov 10, 3:33 PM CST | Wind Advisory | DVN | 50 hr |
| Nov 11, 10:17 AM CST | Mesoscale Discussion | SPC | 118 min |
| Nov 11, 2:24 PM CST | Mesoscale Discussion | SPC | 2 hr |
| Nov 11, 3:20 PM CST | Tornado Watch | SPC | 6 hr |
| Nov 11, 4:16 PM CST | Severe Thunderstorm Warning | DVN | 59 min |
| Nov 11, 4:17 PM CST | Tornado Warning | DVN | 43 min |
| Nov 19, 3:36 AM CST | Wind Advisory | DVN | 14 hr |
| Nov 19, 4:11 AM CST | Winter Storm Watch | DVN | 11 hr |
| Nov 19, 3:32 PM CST | Winter Storm Warning | DVN | 44 hr |
| Nov 20, 1:51 PM CST | Mesoscale Discussion | SPC | 5 hr |
| Nov 20, 7:33 PM CST | Mesoscale Discussion | SPC | 4 hr |
| Nov 27, 5:12 AM CST | River Flood Warning | DVN | 5 days |
| Dec 1, 7:31 AM CST | River Flood Warning | DVN | 58 hr |
| Dec 2, 3:45 AM CST | Special Weather Statement | DVN | 75 min |
| Dec 10, 12:52 PM CST | Wind Advisory | DVN | 4 hr |
| Dec 11, 9:53 PM CST | Dense Fog Advisory | DVN | 14 hr |
| Dec 13, 1:47 PM CST | River Flood Warning | DVN | 18 days |
| Dec 23, 3:24 PM CST | Mesoscale Discussion | SPC | 96 min |
| Dec 26, 3:57 PM CST | Winter Storm Watch | DVN | 24 hr |
| Dec 27, 4:03 PM CST | Winter Storm Warning | DVN | 38 hr |
| Dec 28, 3:35 AM CST | Mesoscale Discussion | SPC | 6 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 archive20142016
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.