Alert archive / Iowa / Henry County
Weather alerts in Henry County, Iowa, 2019
179 weather alerts in 2019, 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 2019. Tap one for its archive.
- Alerts
- 179
- Warnings
- 42
- Watches
- 37
- Advisories
- 43
- Busiest month
- May48 alerts
- Busiest day
- May 24, 20197 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
2 of 2 tornado warnings covering Henry County in 2019 had a tornado report inside them.
Henry County, 2019
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 2 | 2 | 0% | 0 | ||
| Severe thunderstorm warnings | 16 | 13 | 19% | 6 | 100% | 23 min |
| Flash flood warnings | 4 | 3 | 25% | 0 |
Each office's whole area, 2019
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Quad Cities, IA: tornado warnings | 33 | 14 | 58% | 27 | 67% | 18 min |
| NWS Quad Cities, IA: severe thunderstorm warnings | 167 | 103 | 38% | 314 | 83% | 25 min |
| NWS Quad Cities, IA: flash flood warnings | 67 | 37 | 45% | 68 | 84% | 95 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 7, 2:50 PM CST | Wind Advisory | DVN | 30 hr |
| Jan 10, 2:21 PM CST | Winter Weather Advisory | DVN | 55 hr |
| Jan 11, 1:39 PM CST | Winter Storm Warning | DVN | 31 hr |
| Jan 14, 2:30 AM CST | Dense Fog Advisory | DVN | 6 hr |
| Jan 14, 1:06 PM CST | Winter Weather Advisory | DVN | 41 hr |
| Jan 16, 9:55 AM CST | Winter Weather Advisory | DVN | 23 hr |
| Jan 17, 10:05 AM CST | Winter Storm Watch | DVN | 17 hr |
| Jan 17, 1:56 PM CST | Winter Storm Warning | DVN | 44 hr |
| Jan 18, 5:54 PM CST | Mesoscale Discussion | SPC | 6 hr |
| Jan 21, 11:55 AM CST | Winter Weather Advisory | DVN | 48 hr |
| Jan 22, 1:20 PM CST | Mesoscale Discussion | SPC | 3 hr |
| Jan 22, 2:36 PM CST | Mesoscale Discussion | SPC | 4 hr |
| Jan 23, 2:40 PM CST | Wind Chill Watch | DVN | 12 hr |
| Jan 23, 2:40 PM CST | Winter Weather Advisory | DVN | 30 hr |
| Jan 24, 2:52 AM CST | Wind Chill Advisory | DVN | 32 hr |
| Jan 26, 3:26 PM CST | Winter Weather Advisory | DVN | 51 hr |
| Jan 27, 2:27 PM CST | Wind Chill Watch | DVN | 24 hr |
| Jan 28, 3:01 AM CST | Wind Chill Advisory | DVN | 39 hr |
| Jan 28, 2:19 PM CST | Wind Chill Warning | DVN | 70 hr |
| Feb 2, 2:49 PM CST | Dense Fog Advisory | DVN | 33 hr |
| Feb 4, 2:15 PM CST | Winter Weather Advisory | DVN | 37 hr |
| Feb 4, 7:09 PM CST | River Flood Warning | DVN | 5 days |
| Feb 5, 3:36 AM CST | Ice Storm Warning | DVN | 24 hr |
| Feb 5, 1:37 PM CST | Mesoscale Discussion | SPC | 5 hr |
| Feb 6, 3:08 AM CST | Winter Weather Advisory | DVN | 48 hr |
| Feb 6, 3:49 AM CST | Winter Weather Advisory | DVN | 47 hr |
| Feb 6, 3:37 PM CST | Ice Storm Warning | DVN | 20 hr |
| Feb 6, 9:33 PM CST | Mesoscale Discussion | SPC | 6 hr |
| Feb 7, 6:26 AM CST | Mesoscale Discussion | SPC | 4 hr |
| Feb 7, 11:54 AM CST | Winter Weather Advisory | DVN | 15 hr |
| Feb 8, 3:13 AM CST | Wind Chill Advisory | DVN | 9 hr |
| Feb 11, 11:22 AM CST | Winter Weather Advisory | DVN | 37 hr |
| Feb 15, 3:08 PM CST | Winter Weather Advisory | DVN | 57 hr |
| Feb 17, 12:46 AM CST | Mesoscale Discussion | SPC | 4 hr |
| Feb 19, 3:46 AM CST | Winter Weather Advisory | DVN | 36 hr |
| Feb 22, 10:26 AM CST | River Flood Watch | DVN | 5 days |
| Feb 22, 2:53 PM CST | High Wind Watch | DVN | 13 hr |
| Feb 23, 3:30 AM CST | Wind Advisory | DVN | 39 hr |
| Feb 23, 6:23 AM CST | Flash Flood Watch | DVN | 15 hr |
| Feb 23, 9:53 AM CST | River Flood Warning | DVN | 5 days |
| Feb 23, 6:21 PM CST | Dense Fog Advisory | DVN | 5 hr |
| Feb 26, 8:23 PM CST | Winter Weather Advisory | DVN | 13 hr |
| Mar 3, 3:42 AM CST | Wind Chill Advisory | DVN | 31 hr |
| Mar 6, 3:13 AM CST | Winter Weather Advisory | DVN | 51 hr |
| Mar 9, 3:06 PM CST | Wind Advisory | DVN | 17 hr |
| Mar 9, 3:42 PM CST | Special Weather Statement | DVN | 93 min |
| Mar 9, 8:48 PM CST | River Flood Warning | DVN | 6 days |
| Mar 13, 9:51 AM CDT | Wind Advisory | DVN | 9 hr |
| Mar 13, 8:09 PM CDT | Wind Advisory | DVN | 26 hr |
| Mar 16, 8:29 PM CDT | River Flood Watch | DVN | 12 hr |
| Mar 17, 8:54 AM CDT | River Flood Warning | DVN | 5 days |
| Apr 5, 3:54 AM CDT | Dense Fog Advisory | DVN | 6 hr |
| Apr 7, 7:11 PM CDT | Severe Thunderstorm Warning | DVN | 21 min |
| Apr 7, 7:19 PM CDT | Special Weather Statement | DVN | 26 min |
| Apr 10, 3:13 AM CDT | Wind Advisory | DVN | 40 hr |
| Apr 12, 3:52 AM CDT | Wind Advisory | DVN | 16 hr |
| Apr 25, 4:06 AM CDT | Dense Fog Advisory | DVN | 6 hr |
| Apr 27, 3:39 PM CDT | Freeze Warning | DVN | 17 hr |
| Apr 29, 3:14 AM CDT | Special Weather Statement | DVN | 3 hr |
| Apr 29, 5:48 AM CDT | Special Weather Statement | DVN | 3 hr |
| Apr 29, 3:34 PM CDT | Flash Flood Watch | DVN | 41 hr |
| Apr 30, 9:07 AM CDT | River Flood Warning | DVN | 3 days |
| Apr 30, 11:18 AM CDT | Flash Flood Warning | DVN | 5 hr |
| May 1, 2:11 PM CDT | Flash Flood Watch | DVN | 19 hr |
| May 2, 1:41 AM CDT | Special Weather Statement | DVN | 49 min |
| May 7, 10:04 AM CDT | River Flood Warning | DVN | 6 days |
| May 8, 1:11 PM CDT | Mesoscale Discussion | SPC | 94 min |
| May 16, 10:35 PM CDT | Special Weather Statement | DVN | 25 min |
| May 17, 6:41 AM CDT | Severe Thunderstorm Warning | DVN | 49 min |
| May 17, 7:12 AM CDT | Special Weather Statement | DVN | 48 min |
| May 18, 2:40 AM CDT | Flash Flood Watch | DVN | 24 hr |
| May 18, 8:58 AM CDT | River Flood Warning | DVN | 18 days |
| May 18, 5:24 PM CDT | Special Weather Statement | DVN | 36 min |
| May 21, 3:37 AM CDT | Flash Flood Watch | DVN | 19 hr |
| May 22, 4:00 PM CDT | Tornado Watch | SPC | 7 hr |
| May 22, 5:59 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 22, 8:12 PM CDT | Mesoscale Discussion | SPC | 63 min |
| May 24, 3:46 AM CDT | Flash Flood Watch | DVN | 23 hr |
| May 24, 7:41 AM CDT | Special Weather Statement | DVN | 64 min |
| May 24, 7:46 AM CDT | Special Weather Statement | DVN | 29 min |
| May 24, 8:41 AM CDT | Special Weather Statement | DVN | 49 min |
| May 24, 9:14 AM CDT | Special Weather Statement | DVN | 46 min |
| May 24, 3:25 PM CDT | Mesoscale Discussion | SPC | 65 min |
| May 24, 6:23 PM CDT | Tornado Watch | SPC | 4 hr |
| May 25, 3:49 AM CDT | Flash Flood Watch | DVN | 27 hr |
| May 25, 3:24 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| May 25, 6:48 PM CDT | Mesoscale Discussion | SPC | 57 min |
| May 25, 7:16 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 25, 7:57 PM CDT | Severe Thunderstorm Warning | DVN | 32 min |
| May 26, 2:57 AM CDT | Special Weather Statement | DVN | 63 min |
| May 27, 8:28 AM CDT | Special Weather Statement | DVN | 62 min |
| May 27, 12:50 PM CDT | Mesoscale Discussion | SPC | 85 min |
| May 27, 1:08 PM CDT | Tornado Warning | DVN | 52 min |
| May 27, 1:17 PM CDT | Tornado Warning | DVN | 58 min |
| May 27, 1:22 PM CDT | Tornado Watch | SPC | 9 hr |
| May 27, 2:05 PM CDT | Flash Flood Warning | DVN | 4 hr |
| May 27, 3:57 PM CDT | Mesoscale Discussion | SPC | 93 min |
| May 28, 1:23 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 28, 3:45 AM CDT | Flash Flood Watch | DVN | 25 hr |
| May 28, 5:10 PM CDT | Flash Flood Warning | DVN | 8 hr |
| May 28, 5:22 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| May 28, 6:24 PM CDT | Special Weather Statement | DVN | 51 min |
| May 28, 6:40 PM CDT | Special Weather Statement | DVN | 50 min |
| May 28, 6:53 PM CDT | Severe Thunderstorm Warning | DVN | 67 min |
| May 29, 12:59 AM CDT | Areal Flood Warning | DVN | 12 hr |
| May 29, 1:18 AM CDT | Special Weather Statement | DVN | 57 min |
| May 29, 3:08 PM CDT | Flash Flood Watch | DVN | 12 hr |
| May 29, 6:17 PM CDT | Mesoscale Discussion | SPC | 118 min |
| May 29, 9:48 PM CDT | Flash Flood Warning | DVN | 5 hr |
| May 30, 3:04 AM CDT | Areal Flood Warning | DVN | 33 hr |
| May 31, 11:58 AM CDT | Areal Flood Warning | DVN | 3 days |
| Jun 1, 3:02 PM CDT | Mesoscale Discussion | SPC | 118 min |
| Jun 5, 8:21 AM CDT | Special Weather Statement | DVN | 39 min |
| Jun 5, 8:46 AM CDT | Special Weather Statement | DVN | 29 min |
| Jun 5, 9:13 AM CDT | Special Weather Statement | DVN | 32 min |
| Jun 5, 10:03 AM CDT | Mesoscale Discussion | SPC | 117 min |
| Jun 15, 5:47 PM CDT | Mesoscale Discussion | SPC | 88 min |
| Jun 15, 7:07 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 15, 7:20 PM CDT | Severe Thunderstorm Warning | DVN | 40 min |
| Jun 15, 8:07 PM CDT | Severe Thunderstorm Warning | DVN | 53 min |
| Jun 21, 11:33 PM CDT | Mesoscale Discussion | SPC | 87 min |
| Jun 22, 12:19 AM CDT | Special Weather Statement | DVN | 56 min |
| Jun 22, 3:13 PM CDT | Flash Flood Watch | DVN | 13 hr |
| Jun 25, 6:50 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jun 28, 10:35 AM CDT | Severe Thunderstorm Warning | DVN | 55 min |
| Jun 28, 11:23 AM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 28, 11:29 AM CDT | Severe Thunderstorm Warning | DVN | 61 min |
| Jun 28, 7:23 PM CDT | Special Weather Statement | DVN | 37 min |
| Jun 28, 7:50 PM CDT | Severe Thunderstorm Warning | DVN | 40 min |
| Jun 29, 1:18 PM CDT | Heat Advisory | DVN | 8 hr |
| Jun 30, 3:18 AM CDT | Heat Advisory | DVN | 18 hr |
| Jun 30, 5:54 PM CDT | Severe Thunderstorm Watch | SPC | 3 hr |
| Jun 30, 7:32 PM CDT | Severe Thunderstorm Warning | DVN | 43 min |
| Jun 30, 7:56 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 3, 4:47 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 5, 7:04 PM CDT | Special Weather Statement | DVN | 56 min |
| Jul 15, 3:13 PM CDT | Excessive Heat Watch | DVN | 37 hr |
| Jul 16, 3:29 PM CDT | Excessive Heat Warning | DVN | 4 days |
| Jul 17, 10:38 AM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 17, 12:59 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 17, 1:50 PM CDT | Severe Thunderstorm Warning | DVN | 55 min |
| Jul 17, 2:40 PM CDT | Severe Thunderstorm Warning | DVN | 50 min |
| Jul 17, 2:44 PM CDT | Severe Thunderstorm Warning | DVN | 61 min |
| Jul 20, 4:58 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 20, 6:54 PM CDT | Mesoscale Discussion | SPC | 66 min |
| Jul 20, 7:37 PM CDT | Severe Thunderstorm Warning | DVN | 39 min |
| Jul 20, 8:17 PM CDT | Special Weather Statement | DVN | 58 min |
| Aug 6, 12:27 AM CDT | Special Weather Statement | DVN | 93 min |
| Aug 12, 3:46 PM CDT | Mesoscale Discussion | SPC | 89 min |
| Aug 20, 5:43 AM CDT | Mesoscale Discussion | SPC | 92 min |
| Aug 20, 6:18 AM CDT | Severe Thunderstorm Watch | SPC | 11 hr |
| Aug 20, 6:28 AM CDT | Severe Thunderstorm Warning | DVN | 62 min |
| Aug 20, 7:08 AM CDT | Severe Thunderstorm Warning | DVN | 52 min |
| Aug 20, 9:04 AM CDT | Mesoscale Discussion | SPC | 86 min |
| Aug 29, 10:55 AM CDT | Mesoscale Discussion | SPC | 95 min |
| Sep 12, 3:40 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Sep 15, 9:07 PM CDT | Dense Fog Advisory | DVN | 13 hr |
| Sep 20, 4:07 AM CDT | Flash Flood Watch | DVN | 63 hr |
| Sep 23, 5:17 AM CDT | Dense Fog Advisory | DVN | 3 hr |
| Sep 27, 11:27 AM CDT | Flash Flood Watch | DVN | 16 hr |
| Sep 27, 3:01 PM CDT | Mesoscale Discussion | SPC | 119 min |
| Sep 27, 4:00 PM CDT | Tornado Watch | SPC | 7 hr |
| Sep 27, 6:21 PM CDT | Mesoscale Discussion | SPC | 114 min |
| Sep 28, 2:43 PM CDT | Flash Flood Watch | DVN | 13 hr |
| Sep 29, 5:00 AM CDT | Flash Flood Watch | DVN | 12 hr |
| Oct 10, 4:08 AM CDT | Freeze Watch | DVN | 23 hr |
| Oct 11, 3:36 AM CDT | Freeze Warning | DVN | 29 hr |
| Oct 12, 9:16 AM CDT | Wind Advisory | DVN | 9 hr |
| Oct 13, 1:52 PM CDT | Frost Advisory | DVN | 19 hr |
| Oct 19, 8:19 PM CDT | Dense Fog Advisory | DVN | 15 hr |
| Oct 21, 10:48 AM CDT | Wind Advisory | DVN | 28 hr |
| Oct 30, 12:30 PM CDT | Winter Weather Advisory | DVN | 28 hr |
| Nov 10, 12:49 PM CST | Winter Weather Advisory | DVN | 24 hr |
| Nov 20, 12:18 AM CST | Dense Fog Advisory | DVN | 10 hr |
| Nov 25, 2:47 PM CST | High Wind Watch | DVN | 21 hr |
| Nov 26, 11:21 AM CST | High Wind Warning | DVN | 31 hr |
| Nov 26, 8:45 PM CST | Special Weather Statement | DVN | 45 min |
| Dec 9, 12:57 PM CST | Snow Squall Warning | DVN | 48 min |
| Dec 28, 9:46 AM CST | Dense Fog Advisory | DVN | 10 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 archive20182020
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.