Alert archive / Iowa / Henry County
Weather alerts in Henry County, Iowa, 2013
123 weather alerts in 2013, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Henry County and its neighbors
Each county as a circle sized by its count in 2013. Tap one for its archive.
- Alerts
- 123
- Warnings
- 31
- Watches
- 24
- Advisories
- 23
- Busiest month
- May37 alerts
- Busiest day
- May 20, 20139 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
0 of 1 tornado warnings covering Henry County in 2013 had a tornado report inside them.
Henry County, 2013
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 1 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 16 | 12 | 25% | 3 | 100% | 18 min |
| Flash flood warnings | 4 | 2 | 50% | 0 |
Each office's whole area, 2013
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Quad Cities, IA: tornado warnings | 23 | 6 | 74% | 17 | 65% | 10 min |
| NWS Quad Cities, IA: severe thunderstorm warnings | 131 | 91 | 31% | 316 | 79% | 20 min |
| NWS Quad Cities, IA: flash flood warnings | 33 | 20 | 39% | 71 | 89% | 128 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 10, 3:17 PM CST | Dense Fog Advisory | DVN | 27 hr |
| Jan 26, 3:41 AM CST | Winter Storm Watch | DVN | 24 hr |
| Jan 26, 9:05 PM CST | Freezing Rain Advisory | DVN | 24 hr |
| Jan 27, 6:40 AM CST | Mesoscale Discussion | SPC | 5 hr |
| Jan 28, 7:52 AM CST | Dense Fog Advisory | DVN | 22 hr |
| Jan 29, 3:39 AM CST | Winter Storm Watch | DVN | 12 hr |
| Jan 29, 3:18 PM CST | Winter Weather Advisory | DVN | 27 hr |
| Jan 31, 3:32 AM CST | Wind Chill Advisory | DVN | 32 hr |
| Feb 10, 7:28 PM CST | Wind Advisory | DVN | 20 hr |
| Feb 19, 2:20 PM CST | Winter Storm Watch | DVN | 25 hr |
| Feb 20, 3:17 PM CST | Winter Storm Warning | DVN | 48 hr |
| Feb 21, 3:37 PM CST | Mesoscale Discussion | SPC | 4 hr |
| Feb 24, 2:56 AM CST | Winter Storm Watch | DVN | 37 hr |
| Feb 25, 3:22 AM CST | Winter Storm Warning | DVN | 42 hr |
| Feb 26, 2:22 AM CST | Mesoscale Discussion | SPC | 5 hr |
| Mar 2, 3:39 PM CST | Winter Storm Watch | DVN | 37 hr |
| Mar 4, 4:13 AM CST | Winter Weather Advisory | DVN | 35 hr |
| Mar 10, 6:37 AM CDT | Dense Fog Advisory | DVN | 21 hr |
| Mar 10, 11:16 AM CDT | River Flood Warning | DVN | 5 days |
| Mar 18, 6:34 AM CDT | Winter Weather Advisory | DVN | 6 hr |
| Mar 22, 3:46 AM CDT | Winter Storm Watch | DVN | 35 hr |
| Mar 23, 2:22 PM CDT | Winter Weather Advisory | DVN | 34 hr |
| Apr 9, 2:54 PM CDT | Flash Flood Watch | DVN | 32 hr |
| Apr 14, 3:38 AM CDT | Wind Advisory | DVN | 15 hr |
| Apr 16, 3:32 PM CDT | Flash Flood Watch | DVN | 45 hr |
| Apr 17, 8:49 AM CDT | Mesoscale Discussion | SPC | 56 min |
| Apr 17, 9:14 AM CDT | Severe Thunderstorm Watch | SPC | 10 hr |
| Apr 17, 11:17 AM CDT | River Flood Warning | DVN | 7 days |
| Apr 17, 12:48 PM CDT | Flash Flood Warning | DVN | 6 hr |
| Apr 17, 1:33 PM CDT | Mesoscale Discussion | SPC | 57 min |
| Apr 17, 4:19 PM CDT | Mesoscale Discussion | SPC | 26 min |
| Apr 17, 9:34 PM CDT | Severe Thunderstorm Warning | DVN | 26 min |
| Apr 18, 3:46 AM CDT | Areal Flood Warning | DVN | 18 hr |
| May 4, 9:02 AM CDT | River Flood Warning | DVN | 4 days |
| May 19, 11:23 AM CDT | Special Weather Statement | DVN | 52 min |
| May 19, 11:30 AM CDT | Mesoscale Discussion | SPC | 90 min |
| May 19, 2:59 PM CDT | Tornado Watch | SPC | 8 hr |
| May 19, 4:52 PM CDT | Special Weather Statement | DVN | 68 min |
| May 19, 7:13 PM CDT | Mesoscale Discussion | SPC | 62 min |
| May 19, 8:07 PM CDT | Severe Thunderstorm Warning | DVN | 38 min |
| May 19, 8:10 PM CDT | Tornado Watch | SPC | 6 hr |
| May 19, 8:37 PM CDT | Severe Thunderstorm Warning | DVN | 38 min |
| May 19, 10:43 PM CDT | Severe Thunderstorm Warning | DVN | 47 min |
| May 19, 10:55 PM CDT | Severe Thunderstorm Warning | DVN | 50 min |
| May 19, 10:58 PM CDT | Mesoscale Discussion | SPC | 62 min |
| May 20, 6:26 PM CDT | Severe Thunderstorm Warning | DVN | 49 min |
| May 20, 6:35 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| May 20, 9:33 PM CDT | Mesoscale Discussion | SPC | 57 min |
| May 22, 7:42 PM CDT | Special Weather Statement | DVN | 48 min |
| May 26, 3:06 AM CDT | Flash Flood Watch | DVN | 56 hr |
| May 26, 8:41 AM CDT | Flash Flood Warning | DVN | 6 hr |
| May 26, 2:50 PM CDT | Special Weather Statement | DVN | 55 min |
| May 26, 7:07 PM CDT | Flash Flood Warning | DVN | 9 hr |
| May 26, 10:12 PM CDT | River Flood Warning | DVN | 12 days |
| May 28, 5:58 AM CDT | Special Weather Statement | DVN | 47 min |
| May 28, 6:45 AM CDT | Special Weather Statement | DVN | 60 min |
| May 28, 10:53 AM CDT | Flash Flood Watch | DVN | 19 hr |
| May 28, 1:37 PM CDT | Mesoscale Discussion | SPC | 113 min |
| May 28, 2:23 PM CDT | Tornado Watch | SPC | 8 hr |
| May 28, 5:22 PM CDT | Severe Thunderstorm Warning | DVN | 38 min |
| May 28, 5:52 PM CDT | Mesoscale Discussion | SPC | 83 min |
| May 28, 6:57 PM CDT | Flash Flood Warning | DVN | 9 hr |
| May 28, 7:39 PM CDT | Severe Thunderstorm Warning | DVN | 66 min |
| May 29, 3:18 PM CDT | Flash Flood Watch | DVN | 54 hr |
| May 30, 11:29 AM CDT | Mesoscale Discussion | SPC | 61 min |
| May 30, 12:32 PM CDT | Tornado Watch | SPC | 7 hr |
| May 30, 2:16 PM CDT | Mesoscale Discussion | SPC | 59 min |
| May 30, 2:41 PM CDT | Severe Thunderstorm Warning | DVN | 49 min |
| May 30, 3:28 PM CDT | Severe Thunderstorm Warning | DVN | 47 min |
| May 30, 3:52 PM CDT | Mesoscale Discussion | SPC | 113 min |
| Jun 6, 2:07 PM CDT | Special Weather Statement | DVN | 83 min |
| Jun 12, 10:52 AM CDT | Special Weather Statement | DVN | 2 hr |
| Jun 12, 12:56 PM CDT | Special Weather Statement | DVN | 109 min |
| Jun 15, 3:56 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 15, 6:46 PM CDT | Severe Thunderstorm Warning | DVN | 44 min |
| Jun 23, 3:57 AM CDT | Flash Flood Watch | DVN | 3 days |
| Jun 23, 11:47 AM CDT | Special Weather Statement | DVN | 58 min |
| Jun 23, 10:02 PM CDT | Severe Thunderstorm Warning | DVN | 43 min |
| Jun 24, 10:35 AM CDT | Mesoscale Discussion | SPC | 55 min |
| Jun 24, 12:14 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 24, 2:10 PM CDT | Severe Thunderstorm Warning | DVN | 50 min |
| Jun 24, 2:11 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 24, 2:42 PM CDT | Severe Thunderstorm Warning | DVN | 48 min |
| Jun 24, 2:42 PM CDT | Tornado Warning | DVN | 33 min |
| Jun 25, 9:44 PM CDT | Mesoscale Discussion | SPC | 91 min |
| Jun 25, 9:49 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 26, 3:32 AM CDT | Mesoscale Discussion | SPC | 88 min |
| Jun 29, 6:08 PM CDT | Special Weather Statement | DVN | 52 min |
| Jul 17, 3:02 AM CDT | Heat Advisory | DVN | 64 hr |
| Jul 21, 4:33 PM CDT | Special Weather Statement | DVN | 57 min |
| Jul 22, 3:33 AM CDT | Dense Fog Advisory | DVN | 4 hr |
| Jul 22, 6:40 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 25, 7:04 PM CDT | Mesoscale Discussion | SPC | 116 min |
| Aug 2, 2:24 PM CDT | Mesoscale Discussion | SPC | 66 min |
| Aug 6, 5:25 AM CDT | Dense Fog Advisory | DVN | 4 hr |
| Aug 6, 6:51 PM CDT | Severe Thunderstorm Watch | SPC | 3 hr |
| Aug 6, 7:48 PM CDT | Severe Thunderstorm Warning | DVN | 42 min |
| Aug 6, 9:37 PM CDT | Mesoscale Discussion | SPC | 113 min |
| Aug 7, 2:41 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 7, 5:32 AM CDT | Mesoscale Discussion | SPC | 103 min |
| Aug 25, 4:09 AM CDT | Heat Advisory | DVN | 6 days |
| Sep 19, 4:29 PM CDT | Mesoscale Discussion | SPC | 91 min |
| Sep 19, 4:40 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Sep 19, 8:03 PM CDT | Special Weather Statement | DVN | 57 min |
| Oct 3, 11:42 PM CDT | Mesoscale Discussion | SPC | 93 min |
| Oct 4, 2:06 AM CDT | Mesoscale Discussion | SPC | 84 min |
| Oct 4, 9:03 AM CDT | Mesoscale Discussion | SPC | 87 min |
| Oct 21, 3:28 AM CDT | Frost Advisory | DVN | 27 hr |
| Oct 22, 3:03 PM CDT | Freeze Warning | DVN | 13 hr |
| Oct 24, 4:19 AM CDT | Freeze Warning | DVN | 29 hr |
| Oct 30, 5:20 AM CDT | Dense Fog Advisory | DVN | 8 hr |
| Oct 30, 1:26 PM CDT | Mesoscale Discussion | SPC | 94 min |
| Nov 16, 3:43 PM CST | Wind Advisory | DVN | 26 hr |
| Nov 17, 7:47 AM CST | Mesoscale Discussion | SPC | 88 min |
| Nov 17, 10:23 AM CST | Severe Thunderstorm Warning | DVN | 52 min |
| Dec 3, 3:23 AM CST | Dense Fog Advisory | DVN | 38 hr |
| Dec 13, 4:05 AM CST | Winter Weather Advisory | DVN | 26 hr |
| Dec 19, 3:50 AM CST | Freezing Rain Advisory | DVN | 35 hr |
| Dec 19, 2:56 PM CST | Winter Storm Watch | DVN | 24 hr |
| Dec 20, 3:02 PM CST | Winter Storm Warning | DVN | 44 hr |
| Dec 21, 10:41 PM CST | Mesoscale Discussion | SPC | 5 hr |
| Dec 23, 4:06 AM CST | Wind Chill Advisory | DVN | 30 hr |
| Dec 28, 3:14 PM CST | Wind Chill Advisory | DVN | 42 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 | 16 |
| Tornado Warning | 1 |
| Severe Thunderstorm Watch | 7 |
| Tornado Watch | 4 |
| Mesoscale Discussion | 32 |
| Special Weather Statement | 13 |
| Flooding | |
| Areal Flood Warning | 1 |
| Flash Flood Warning | 4 |
| River Flood Warning | 4 |
| Flash Flood Watch | 6 |
| Winter | |
| Winter Storm Warning | 3 |
| Winter Storm Watch | 7 |
| Freezing Rain Advisory | 2 |
| Winter Weather Advisory | 5 |
| Heat | |
| Heat Advisory | 2 |
| Cold | |
| Freeze Warning | 2 |
| Frost Advisory | 1 |
| Wind Chill Advisory | 3 |
| Wind and dust | |
| Wind Advisory | 3 |
| Fog and smoke | |
| Dense Fog Advisory | 7 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20122014
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.