Alert archive / Iowa / Hamilton County
Weather alerts in Hamilton County, Iowa, 2019
139 weather alerts in 2019, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Hamilton County and its neighbors
Each county as a circle sized by its count in 2019. Tap one for its archive.
- Alerts
- 139
- Warnings
- 34
- Watches
- 25
- Advisories
- 45
- Busiest month
- September20 alerts
- Busiest day
- August 20, 20196 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Hamilton County, 2019
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 14 | 4 | 71% | 2 | 100% | 20 min |
| Flash flood warnings | 1 | 0 | 100% | 0 |
Each office's whole area, 2019
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Des Moines, IA: tornado warnings | 26 | 9 | 65% | 27 | 52% | 11 min |
| NWS Des Moines, IA: severe thunderstorm warnings | 253 | 104 | 59% | 288 | 76% | 19 min |
| NWS Des Moines, IA: flash flood warnings | 24 | 12 | 50% | 40 | 80% | 76 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, 3:09 PM CST | Wind Advisory | DMX | 30 hr |
| Jan 14, 6:53 PM CST | Winter Weather Advisory | DMX | 15 hr |
| Jan 17, 4:15 AM CST | Winter Weather Advisory | DMX | 9 hr |
| Jan 17, 1:01 PM CST | Winter Storm Warning | DMX | 39 hr |
| Jan 18, 9:52 AM CST | Winter Weather Advisory | DMX | 22 hr |
| Jan 21, 4:15 AM CST | Winter Weather Advisory | DMX | 54 hr |
| Jan 21, 3:24 PM CST | Winter Storm Warning | DMX | 13 hr |
| Jan 22, 3:55 AM CST | Winter Storm Warning | DMX | 29 hr |
| Jan 23, 3:22 PM CST | Wind Chill Watch | DMX | 12 hr |
| Jan 23, 3:22 PM CST | Wind Chill Advisory | DMX | 42 hr |
| Jan 23, 3:22 PM CST | Winter Weather Advisory | DMX | 27 hr |
| Jan 26, 3:49 PM CST | Winter Storm Warning | DMX | 44 hr |
| Jan 26, 3:49 PM CST | Winter Weather Advisory | DMX | 44 hr |
| Jan 27, 4:26 AM CST | Wind Chill Watch | DMX | 49 hr |
| Jan 28, 4:04 AM CST | Wind Chill Warning | DMX | 3 days |
| Jan 28, 4:04 AM CST | Wind Chill Advisory | DMX | 38 hr |
| Jan 28, 12:21 PM CST | Winter Weather Advisory | DMX | 3 hr |
| Jan 30, 3:49 AM CST | Wind Chill Advisory | DMX | 13 hr |
| Feb 2, 9:27 AM CST | Dense Fog Advisory | DMX | 39 hr |
| Feb 5, 9:36 PM CST | Winter Weather Advisory | DMX | 54 hr |
| Feb 7, 3:34 PM CST | Wind Chill Advisory | DMX | 20 hr |
| Feb 9, 2:58 PM CST | Winter Weather Advisory | DMX | 27 hr |
| Feb 10, 3:43 PM CST | Winter Storm Watch | DMX | 12 hr |
| Feb 10, 3:43 PM CST | Winter Weather Advisory | DMX | 53 hr |
| Feb 11, 3:54 AM CST | Winter Storm Warning | DMX | 41 hr |
| Feb 14, 3:53 AM CST | Wind Chill Advisory | DMX | 29 hr |
| Feb 14, 11:55 AM CST | Winter Weather Advisory | DMX | 6 hr |
| Feb 15, 2:56 PM CST | Winter Weather Advisory | DMX | 51 hr |
| Feb 17, 12:46 AM CST | Mesoscale Discussion | SPC | 4 hr |
| Feb 18, 3:45 AM CST | Winter Storm Watch | DMX | 24 hr |
| Feb 19, 3:29 AM CST | Winter Storm Warning | DMX | 36 hr |
| Feb 21, 3:13 PM CST | Winter Storm Watch | DMX | 25 hr |
| Feb 22, 4:07 AM CST | Winter Weather Advisory | DMX | 38 hr |
| Feb 22, 3:43 PM CST | Blizzard Warning | DMX | 53 hr |
| Feb 22, 3:43 PM CST | Winter Weather Advisory | DMX | 53 hr |
| Feb 23, 5:26 PM CST | Mesoscale Discussion | SPC | 5 hr |
| Mar 2, 3:08 AM CST | Wind Chill Advisory | DMX | 57 hr |
| Mar 3, 4:03 PM CST | Wind Chill Warning | DMX | 16 hr |
| Mar 3, 4:03 PM CST | Wind Chill Advisory | DMX | 20 hr |
| Mar 8, 3:48 PM CST | Winter Weather Advisory | DMX | 44 hr |
| Mar 9, 3:31 PM CST | Wind Advisory | DMX | 14 hr |
| Mar 11, 3:16 PM CDT | Flood Watch | DMX | 67 hr |
| Mar 12, 10:53 AM CDT | River Flood Watch | DMX | 36 hr |
| Mar 12, 3:39 PM CDT | Dense Fog Advisory | DMX | 45 hr |
| Mar 13, 1:04 PM CDT | Areal Flood Warning | DMX | 24 hr |
| Mar 13, 9:21 PM CDT | Wind Advisory | DMX | 31 hr |
| Mar 13, 10:25 PM CDT | River Flood Warning | DMX | 10 days |
| Mar 14, 10:38 AM CDT | Areal Flood Warning | DMX | 36 hr |
| Mar 15, 8:41 PM CDT | Areal Flood Warning | DMX | 24 hr |
| Mar 20, 8:59 AM CDT | Dense Fog Advisory | DMX | 2 hr |
| Apr 5, 2:56 AM CDT | Dense Fog Advisory | DMX | 6 hr |
| Apr 9, 10:23 AM CDT | River Flood Watch | DMX | 21 days |
| Apr 10, 4:25 AM CDT | Wind Advisory | DMX | 39 hr |
| Apr 11, 4:33 AM CDT | High Wind Warning | DMX | 8 hr |
| Apr 17, 2:44 PM CDT | Mesoscale Discussion | SPC | 91 min |
| Apr 27, 3:40 PM CDT | Freeze Warning | DMX | 17 hr |
| May 5, 1:35 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 5, 2:24 PM CDT | Special Weather Statement | DMX | 51 min |
| May 5, 3:12 PM CDT | Special Weather Statement | DMX | 63 min |
| May 13, 4:45 AM CDT | Dense Fog Advisory | DMX | 4 hr |
| May 15, 3:38 AM CDT | Dense Fog Advisory | DMX | 5 hr |
| May 16, 7:57 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 16, 11:12 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 20, 3:51 PM CDT | Wind Advisory | DMX | 30 hr |
| May 24, 10:36 AM CDT | River Flood Warning | DMX | 3 days |
| May 27, 7:17 AM CDT | Special Weather Statement | DMX | 28 min |
| May 27, 9:53 PM CDT | River Flood Watch | DMX | 13 hr |
| May 29, 6:17 PM CDT | Mesoscale Discussion | SPC | 118 min |
| Jun 5, 12:52 AM CDT | Special Weather Statement | DMX | 38 min |
| Jun 15, 12:30 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 15, 1:20 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 15, 3:19 PM CDT | Severe Thunderstorm Warning | DMX | 41 min |
| Jun 15, 3:50 PM CDT | Mesoscale Discussion | SPC | 115 min |
| Jun 27, 8:46 AM CDT | Mesoscale Discussion | SPC | 89 min |
| Jun 27, 11:14 AM CDT | Mesoscale Discussion | SPC | 91 min |
| Jun 27, 12:04 PM CDT | Severe Thunderstorm Warning | DMX | 41 min |
| Jun 27, 12:23 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 27, 1:55 PM CDT | Mesoscale Discussion | SPC | 95 min |
| Jun 28, 3:18 PM CDT | Heat Advisory | DMX | 30 hr |
| Jun 29, 3:37 PM CDT | Heat Advisory | DMX | 29 hr |
| Jul 2, 3:42 PM CDT | Mesoscale Discussion | SPC | 93 min |
| Jul 3, 2:11 PM CDT | Flash Flood Watch | DMX | 7 hr |
| Jul 15, 3:40 PM CDT | Excessive Heat Watch | DMX | 48 hr |
| Jul 16, 3:08 PM CDT | Excessive Heat Warning | DMX | 4 days |
| Jul 17, 9:09 AM CDT | Mesoscale Discussion | SPC | 96 min |
| Jul 17, 9:34 AM CDT | Special Weather Statement | DMX | 56 min |
| Jul 17, 10:16 AM CDT | Severe Thunderstorm Warning | DMX | 44 min |
| Jul 18, 7:01 AM CDT | Special Weather Statement | DMX | 14 min |
| Jul 18, 7:29 AM CDT | Special Weather Statement | DMX | 16 min |
| Jul 20, 10:05 AM CDT | Mesoscale Discussion | SPC | 115 min |
| Jul 20, 11:24 AM CDT | Special Weather Statement | DMX | 51 min |
| Jul 20, 11:35 AM CDT | Severe Thunderstorm Warning | DMX | 40 min |
| Aug 5, 2:43 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 5, 3:16 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Aug 5, 6:14 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 5, 8:32 PM CDT | Severe Thunderstorm Warning | DMX | 28 min |
| Aug 5, 8:58 PM CDT | Severe Thunderstorm Warning | DMX | 32 min |
| Aug 10, 3:56 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 13, 12:46 AM CDT | Dense Fog Advisory | DMX | 8 hr |
| Aug 17, 10:16 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Aug 17, 10:32 PM CDT | Mesoscale Discussion | SPC | 88 min |
| Aug 18, 12:00 AM CDT | Mesoscale Discussion | SPC | 90 min |
| Aug 18, 1:46 AM CDT | Special Weather Statement | DMX | 59 min |
| Aug 19, 11:56 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Aug 20, 3:08 AM CDT | Mesoscale Discussion | SPC | 97 min |
| Aug 20, 4:20 AM CDT | Severe Thunderstorm Warning | DMX | 40 min |
| Aug 20, 4:33 AM CDT | Severe Thunderstorm Warning | DMX | 42 min |
| Aug 20, 5:02 AM CDT | Severe Thunderstorm Warning | DMX | 43 min |
| Aug 20, 5:06 AM CDT | Flash Flood Warning | DMX | 5 hr |
| Sep 9, 2:49 PM CDT | Mesoscale Discussion | SPC | 116 min |
| Sep 9, 3:32 PM CDT | Tornado Watch | SPC | 6 hr |
| Sep 9, 5:20 PM CDT | Severe Thunderstorm Warning | DMX | 40 min |
| Sep 9, 6:43 PM CDT | Special Weather Statement | DMX | 47 min |
| Sep 12, 1:12 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 12, 3:40 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Sep 14, 3:16 PM CDT | Severe Thunderstorm Warning | DMX | 44 min |
| Sep 14, 3:50 PM CDT | Severe Thunderstorm Warning | DMX | 29 min |
| Sep 14, 4:44 PM CDT | Severe Thunderstorm Warning | DMX | 29 min |
| Sep 16, 3:49 AM CDT | Dense Fog Advisory | DMX | 6 hr |
| Sep 18, 3:36 PM CDT | Flood Watch | DMX | 4 hr |
| Sep 18, 7:40 PM CDT | Flash Flood Watch | DMX | 14 hr |
| Sep 18, 10:28 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 21, 7:54 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 23, 3:34 AM CDT | Dense Fog Advisory | DMX | 5 hr |
| Sep 24, 4:43 PM CDT | Tornado Watch | SPC | 7 hr |
| Sep 24, 6:33 PM CDT | Mesoscale Discussion | SPC | 117 min |
| Sep 24, 9:01 PM CDT | Severe Thunderstorm Warning | DMX | 44 min |
| Sep 30, 4:03 AM CDT | Flash Flood Watch | DMX | 47 hr |
| Sep 30, 10:57 AM CDT | River Flood Watch | DMX | 6 days |
| Oct 10, 4:02 AM CDT | Freeze Watch | DMX | 24 hr |
| Oct 11, 3:43 AM CDT | Freeze Warning | DMX | 29 hr |
| Oct 12, 9:35 AM CDT | Wind Advisory | DMX | 9 hr |
| Oct 18, 3:25 AM CDT | Wind Advisory | DMX | 15 hr |
| Oct 20, 9:17 PM CDT | Wind Advisory | DMX | 45 hr |
| Oct 21, 11:25 AM CDT | High Wind Warning | DMX | 21 hr |
| Nov 10, 1:26 PM CST | Winter Weather Advisory | DMX | 23 hr |
| Nov 25, 2:41 PM CST | Winter Weather Advisory | DMX | 45 hr |
| Nov 27, 12:14 PM CST | Wind Advisory | DMX | 3 hr |
| Dec 9, 3:26 AM CST | Winter Weather Advisory | DMX | 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.