Alert archive / Iowa / Worth County
Weather alerts in Worth County, Iowa, 2017
114 weather alerts in 2017, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Worth County and its neighbors
Each county as a circle sized by its count in 2017. Tap one for its archive.
- Alerts
- 114
- Warnings
- 19
- Watches
- 15
- Advisories
- 38
- Busiest month
- January18 alerts
- Busiest day
- May 17, 20179 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Worth County, 2017
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 13 | 10 | 23% | 16 | 100% | 26 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2017
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Des Moines, IA: tornado warnings | 25 | 10 | 60% | 18 | 89% | 9 min |
| NWS Des Moines, IA: severe thunderstorm warnings | 275 | 154 | 44% | 522 | 83% | 21 min |
| NWS Des Moines, IA: flash flood warnings | 9 | 6 | 33% | 14 | 86% | 248 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 1, 3:29 AM CST | Freezing Rain Advisory | DMX | 36 hr |
| Jan 3, 3:27 PM CST | Wind Chill Advisory | DMX | 19 hr |
| Jan 4, 2:48 PM CST | Wind Chill Advisory | DMX | 18 hr |
| Jan 5, 3:26 PM CST | Wind Chill Advisory | DMX | 19 hr |
| Jan 10, 4:16 AM CST | Winter Weather Advisory | DMX | 14 hr |
| Jan 12, 3:11 PM CST | Wind Chill Advisory | DMX | 15 hr |
| Jan 12, 3:11 PM CST | Winter Storm Watch | DMX | 49 hr |
| Jan 14, 4:13 PM CST | Winter Weather Advisory | DMX | 59 hr |
| Jan 16, 1:53 PM CST | Mesoscale Discussion | SPC | 5 hr |
| Jan 18, 9:28 PM CST | Dense Fog Advisory | DMX | 15 hr |
| Jan 19, 3:28 PM CST | Dense Fog Advisory | DMX | 21 hr |
| Jan 20, 3:31 PM CST | Dense Fog Advisory | DMX | 20 hr |
| Jan 21, 3:53 PM CST | Dense Fog Advisory | DMX | 20 hr |
| Jan 22, 3:01 PM CST | Winter Storm Watch | DMX | 24 hr |
| Jan 23, 3:12 PM CST | Winter Storm Warning | DMX | 51 hr |
| Jan 23, 3:12 PM CST | Winter Weather Advisory | DMX | 57 hr |
| Jan 24, 4:56 PM CST | Mesoscale Discussion | SPC | 5 hr |
| Jan 30, 3:52 AM CST | Wind Advisory | DMX | 17 hr |
| Feb 1, 3:13 AM CST | Special Weather Statement | DMX | 2 hr |
| Feb 19, 1:42 AM CST | Dense Fog Advisory | DMX | 7 hr |
| Feb 21, 3:42 PM CST | Winter Storm Watch | DMX | 37 hr |
| Feb 23, 4:31 AM CST | Blizzard Warning | DMX | 41 hr |
| Feb 23, 6:05 PM CST | Mesoscale Discussion | SPC | 6 hr |
| Feb 23, 11:54 PM CST | Mesoscale Discussion | SPC | 6 hr |
| Mar 6, 4:25 AM CST | Wind Advisory | DMX | 24 hr |
| Mar 6, 1:54 PM CST | Tornado Watch | SPC | 8 hr |
| Mar 6, 3:28 PM CST | Fire Weather Watch | DMX | 13 hr |
| Mar 6, 3:29 PM CST | Wind Advisory | DMX | 27 hr |
| Mar 6, 3:35 PM CST | Mesoscale Discussion | SPC | 115 min |
| Mar 6, 6:11 PM CST | Mesoscale Discussion | SPC | 2 hr |
| Mar 7, 4:00 AM CST | Red Flag Warning | DMX | 14 hr |
| Mar 10, 3:31 PM CST | Winter Storm Watch | DMX | 36 hr |
| Mar 12, 4:08 AM CDT | Winter Storm Warning | DMX | 31 hr |
| Mar 23, 4:15 PM CDT | Severe Thunderstorm Warning | DMX | 30 min |
| Apr 9, 3:16 PM CDT | Mesoscale Discussion | SPC | 119 min |
| Apr 9, 8:06 PM CDT | Mesoscale Discussion | SPC | 54 min |
| Apr 9, 8:57 PM CDT | Severe Thunderstorm Warning | DMX | 48 min |
| Apr 9, 9:01 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Apr 9, 9:51 PM CDT | Severe Thunderstorm Warning | DMX | 9 min |
| Apr 9, 10:25 PM CDT | Severe Thunderstorm Warning | DMX | 23 min |
| Apr 19, 6:55 PM CDT | Mesoscale Discussion | SPC | 95 min |
| May 8, 6:34 PM CDT | Mesoscale Discussion | SPC | 116 min |
| May 15, 3:42 PM CDT | Severe Thunderstorm Warning | DMX | 18 min |
| May 15, 3:48 PM CDT | Mesoscale Discussion | SPC | 87 min |
| May 15, 5:11 PM CDT | Severe Thunderstorm Watch | SPC | 9 hr |
| May 15, 7:19 PM CDT | Mesoscale Discussion | SPC | 56 min |
| May 15, 8:50 PM CDT | Mesoscale Discussion | SPC | 115 min |
| May 16, 2:13 AM CDT | Mesoscale Discussion | SPC | 92 min |
| May 16, 7:31 PM CDT | Mesoscale Discussion | SPC | 59 min |
| May 16, 8:46 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| May 16, 9:19 PM CDT | Severe Thunderstorm Warning | DMX | 56 min |
| May 16, 9:49 PM CDT | Severe Thunderstorm Warning | DMX | 26 min |
| May 16, 10:15 PM CDT | Severe Thunderstorm Warning | DMX | 33 min |
| May 16, 11:48 PM CDT | Mesoscale Discussion | SPC | 117 min |
| May 17, 12:08 PM CDT | Tornado Watch | SPC | 7 hr |
| May 17, 2:38 PM CDT | Mesoscale Discussion | SPC | 97 min |
| May 17, 5:53 PM CDT | Severe Thunderstorm Warning | DMX | 34 min |
| May 22, 6:30 PM CDT | Special Weather Statement | DMX | 60 min |
| Jun 2, 5:49 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 11, 7:28 PM CDT | Special Weather Statement | DMX | 62 min |
| Jun 12, 11:28 AM CDT | Mesoscale Discussion | SPC | 92 min |
| Jun 12, 11:47 AM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 12, 2:22 PM CDT | Mesoscale Discussion | SPC | 113 min |
| Jun 14, 12:30 AM CDT | Special Weather Statement | DMX | 60 min |
| Jun 16, 3:29 PM CDT | Mesoscale Discussion | SPC | 91 min |
| Jun 16, 3:53 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 16, 5:09 PM CDT | Special Weather Statement | DMX | 51 min |
| Jun 22, 12:57 AM CDT | Special Weather Statement | DMX | 63 min |
| Jun 22, 9:28 AM CDT | Mesoscale Discussion | SPC | 92 min |
| Jun 22, 9:50 AM CDT | Special Weather Statement | DMX | 40 min |
| Jun 29, 9:16 PM CDT | Severe Thunderstorm Warning | DMX | 29 min |
| Jul 9, 9:10 PM CDT | Mesoscale Discussion | SPC | 65 min |
| Jul 9, 9:40 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 9, 11:25 PM CDT | Severe Thunderstorm Warning | DMX | 50 min |
| Jul 9, 11:45 PM CDT | Mesoscale Discussion | SPC | 60 min |
| Jul 10, 12:50 AM CDT | Severe Thunderstorm Warning | DMX | 40 min |
| Jul 18, 2:19 PM CDT | Mesoscale Discussion | SPC | 116 min |
| Jul 19, 12:11 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 19, 12:36 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 19, 4:19 PM CDT | Severe Thunderstorm Warning | DMX | 56 min |
| Jul 20, 1:16 AM CDT | Mesoscale Discussion | SPC | 119 min |
| Jul 26, 8:58 AM CDT | Special Weather Statement | DMX | 92 min |
| Aug 1, 7:45 PM CDT | Special Weather Statement | DMX | 45 min |
| Aug 15, 3:10 AM CDT | Dense Fog Advisory | DMX | 6 hr |
| Aug 18, 4:51 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Aug 18, 6:58 PM CDT | Mesoscale Discussion | SPC | 62 min |
| Aug 18, 9:00 PM CDT | Mesoscale Discussion | SPC | 60 min |
| Aug 27, 2:37 AM CDT | Dense Fog Advisory | DMX | 5 hr |
| Aug 30, 4:31 AM CDT | Dense Fog Advisory | DMX | 8 min |
| Aug 30, 4:39 AM CDT | Dense Fog Advisory | DMX | 4 hr |
| Sep 4, 6:28 PM CDT | Special Weather Statement | DMX | 62 min |
| Sep 16, 4:28 AM CDT | Special Weather Statement | DMX | 62 min |
| Sep 18, 9:56 PM CDT | Dense Fog Advisory | DMX | 12 hr |
| Sep 22, 10:20 AM CDT | Heat Advisory | DMX | 9 hr |
| Oct 15, 3:27 PM CDT | Frost Advisory | DMX | 17 hr |
| Oct 21, 2:57 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Oct 21, 6:58 PM CDT | Special Weather Statement | DMX | 17 min |
| Oct 22, 3:10 PM CDT | Wind Advisory | DMX | 51 hr |
| Oct 26, 3:38 PM CDT | Freeze Warning | DMX | 17 hr |
| Oct 26, 3:50 PM CDT | Winter Weather Advisory | DMX | 27 hr |
| Nov 14, 3:29 PM CST | Dense Fog Advisory | DMX | 6 hr |
| Nov 17, 7:39 PM CST | Dense Fog Advisory | DMX | 4 hr |
| Nov 20, 3:33 PM CST | Wind Advisory | DMX | 22 hr |
| Dec 3, 3:41 PM CST | Wind Advisory | DMX | 39 hr |
| Dec 5, 4:12 AM CST | Wind Advisory | DMX | 3 hr |
| Dec 5, 4:12 AM CST | Wind Advisory | DMX | 12 hr |
| Dec 12, 3:57 PM CST | Wind Advisory | DMX | 26 hr |
| Dec 17, 4:04 AM CST | Dense Fog Advisory | DMX | 6 hr |
| Dec 21, 3:54 AM CST | Winter Weather Advisory | DMX | 19 hr |
| Dec 25, 4:18 AM CST | Wind Chill Advisory | DMX | 32 hr |
| Dec 26, 1:53 PM CST | Wind Chill Advisory | DMX | 20 hr |
| Dec 28, 3:25 PM CST | Winter Weather Advisory | DMX | 30 hr |
| Dec 29, 3:40 AM CST | Winter Weather Advisory | DMX | 14 hr |
| Dec 29, 3:50 PM CST | Wind Chill Warning | DMX | 4 days |
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 | 13 |
| Severe Thunderstorm Watch | 8 |
| Tornado Watch | 2 |
| Mesoscale Discussion | 30 |
| Special Weather Statement | 12 |
| Winter | |
| Blizzard Warning | 1 |
| Winter Storm Warning | 2 |
| Winter Storm Watch | 4 |
| Freezing Rain Advisory | 1 |
| Winter Weather Advisory | 7 |
| Heat | |
| Heat Advisory | 1 |
| Cold | |
| Freeze Warning | 1 |
| Wind Chill Warning | 1 |
| Frost Advisory | 1 |
| Wind Chill Advisory | 6 |
| Wind and dust | |
| Wind Advisory | 9 |
| Fire | |
| Red Flag Warning | 1 |
| Fire Weather Watch | 1 |
| Fog and smoke | |
| Dense Fog Advisory | 13 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20162018
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.