Alert archive / Iowa / Dallas County
Weather alerts in Dallas County, Iowa, 2016
102 weather alerts in 2016, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Dallas County and its neighbors
Each county as a circle sized by its count in 2016. Tap one for its archive.
- Alerts
- 102
- Warnings
- 29
- Watches
- 16
- Advisories
- 27
- Busiest month
- July22 alerts
- Busiest day
- July 19, 20166 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Dallas County, 2016
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 15 | 11 | 27% | 13 | 92% | 14 min |
| Flash flood warnings | 2 | 2 | 0% | 1 | 100% | 33 min |
Each office's whole area, 2016
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Des Moines, IA: tornado warnings | 19 | 11 | 42% | 23 | 65% | 16 min |
| NWS Des Moines, IA: severe thunderstorm warnings | 162 | 79 | 51% | 246 | 65% | 21 min |
| NWS Des Moines, IA: flash flood warnings | 39 | 28 | 28% | 64 | 84% | 135 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, 6:46 AM CST | Dense Fog Advisory | DMX | 5 hr |
| Jan 8, 9:45 PM CST | Winter Weather Advisory | DMX | 6 hr |
| Jan 9, 3:55 AM CST | Wind Chill Advisory | DMX | 32 hr |
| Jan 16, 3:46 PM CST | Wind Chill Advisory | DMX | 41 hr |
| Jan 18, 3:43 PM CST | Winter Weather Advisory | DMX | 29 hr |
| Jan 24, 3:17 PM CST | Winter Weather Advisory | DMX | 33 hr |
| Jan 31, 3:48 AM CST | Blizzard Watch | DMX | 25 hr |
| Feb 1, 4:21 AM CST | Winter Storm Warning | DMX | 50 hr |
| Feb 2, 11:19 PM CST | Winter Weather Advisory | DMX | 14 hr |
| Feb 5, 3:50 PM CST | Blizzard Watch | DMX | 36 hr |
| Feb 7, 3:31 AM CST | Blizzard Warning | DMX | 38 hr |
| Feb 7, 11:18 PM CST | Winter Weather Advisory | DMX | 34 hr |
| Feb 13, 3:58 AM CST | Winter Weather Advisory | DMX | 34 hr |
| Feb 18, 3:48 PM CST | Wind Advisory | DMX | 26 hr |
| Feb 19, 10:41 AM CST | River Flood Warning | DMX | 7 days |
| Feb 21, 10:41 AM CST | River Flood Warning | DMX | 4 days |
| Feb 21, 7:28 PM CST | Areal Flood Warning | DMX | 24 hr |
| Mar 13, 10:15 PM CDT | Dense Fog Advisory | DMX | 14 hr |
| Mar 15, 3:37 AM CDT | High Wind Watch | DMX | 11 hr |
| Mar 15, 3:05 PM CDT | Wind Advisory | DMX | 28 hr |
| Mar 30, 6:58 PM CDT | Severe Thunderstorm Warning | DMX | 32 min |
| Mar 30, 7:26 PM CDT | Severe Thunderstorm Warning | DMX | 19 min |
| Apr 3, 4:03 AM CDT | Wind Advisory | DMX | 15 hr |
| Apr 5, 2:57 PM CDT | Wind Advisory | DMX | 25 hr |
| Apr 7, 3:21 PM CDT | Freeze Watch | DMX | 12 hr |
| Apr 8, 3:34 AM CDT | Freeze Warning | DMX | 29 hr |
| Apr 11, 9:42 AM CDT | Freeze Warning | DMX | 23 hr |
| Apr 30, 8:14 PM CDT | River Flood Warning | DMX | 5 days |
| May 11, 5:17 AM CDT | Dense Fog Advisory | DMX | 6 hr |
| May 23, 1:58 PM CDT | Mesoscale Discussion | SPC | 92 min |
| May 25, 4:39 AM CDT | Special Weather Statement | DMX | 66 min |
| May 26, 2:30 AM CDT | Severe Thunderstorm Warning | DMX | 45 min |
| May 26, 2:54 AM CDT | Severe Thunderstorm Warning | DMX | 51 min |
| May 26, 2:09 PM CDT | Tornado Watch | SPC | 8 hr |
| May 26, 6:08 PM CDT | Special Weather Statement | DMX | 37 min |
| May 30, 5:06 PM CDT | Severe Thunderstorm Warning | DMX | 24 min |
| May 30, 5:14 PM CDT | Mesoscale Discussion | SPC | 91 min |
| May 30, 5:46 PM CDT | Severe Thunderstorm Warning | DMX | 29 min |
| May 30, 6:11 PM CDT | Severe Thunderstorm Warning | DMX | 34 min |
| Jun 9, 3:56 PM CDT | Heat Advisory | DMX | 3 days |
| Jun 14, 11:45 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 14, 12:43 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 14, 2:51 PM CDT | Mesoscale Discussion | SPC | 114 min |
| Jun 14, 7:00 PM CDT | Mesoscale Discussion | SPC | 60 min |
| Jun 14, 7:19 PM CDT | Special Weather Statement | DMX | 56 min |
| Jun 14, 7:43 PM CDT | Severe Thunderstorm Warning | DMX | 47 min |
| Jun 14, 8:36 PM CDT | Mesoscale Discussion | SPC | 84 min |
| Jun 25, 1:52 PM CDT | Mesoscale Discussion | SPC | 83 min |
| Jun 25, 9:57 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 30, 1:29 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 4, 3:36 PM CDT | Heat Advisory | DMX | 28 hr |
| Jul 5, 10:35 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 6, 12:14 AM CDT | Severe Thunderstorm Warning | DMX | 46 min |
| Jul 6, 12:49 AM CDT | Severe Thunderstorm Warning | DMX | 41 min |
| Jul 7, 12:30 AM CDT | Mesoscale Discussion | SPC | 90 min |
| Jul 7, 12:47 AM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jul 7, 1:50 PM CDT | Mesoscale Discussion | SPC | 115 min |
| Jul 7, 3:54 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 7, 6:30 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 10, 7:34 AM CDT | Mesoscale Discussion | SPC | 86 min |
| Jul 11, 8:43 PM CDT | Mesoscale Discussion | SPC | 92 min |
| Jul 13, 5:51 PM CDT | Severe Thunderstorm Warning | DMX | 39 min |
| Jul 17, 2:06 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 17, 4:37 AM CDT | Special Weather Statement | DMX | 53 min |
| Jul 18, 1:39 AM CDT | Flash Flood Watch | DMX | 7 hr |
| Jul 18, 3:43 PM CDT | Excessive Heat Watch | DMX | 36 hr |
| Jul 19, 3:36 AM CDT | Flash Flood Watch | DMX | 24 hr |
| Jul 19, 12:28 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 19, 12:36 PM CDT | Flash Flood Warning | DMX | 6 hr |
| Jul 19, 1:55 PM CDT | River Flood Warning | DMX | 29 hr |
| Jul 19, 4:24 PM CDT | Excessive Heat Watch | DMX | 12 hr |
| Jul 19, 4:24 PM CDT | Excessive Heat Warning | DMX | 4 days |
| Aug 3, 2:58 AM CDT | Dense Fog Advisory | DMX | 5 hr |
| Aug 4, 1:28 PM CDT | Heat Advisory | DMX | 6 hr |
| Aug 4, 2:00 PM CDT | Special Weather Statement | DMX | 30 min |
| Aug 10, 3:52 PM CDT | Mesoscale Discussion | SPC | 113 min |
| Aug 10, 5:02 PM CDT | Severe Thunderstorm Warning | DMX | 28 min |
| Aug 10, 5:25 PM CDT | Flash Flood Warning | DMX | 6 hr |
| Aug 11, 3:46 AM CDT | Flash Flood Watch | DMX | 27 hr |
| Aug 11, 3:58 AM CDT | Heat Advisory | DMX | 16 hr |
| Aug 11, 12:37 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 11, 3:26 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 11, 3:55 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 11, 6:17 PM CDT | Mesoscale Discussion | SPC | 58 min |
| Aug 11, 8:14 PM CDT | Severe Thunderstorm Warning | DMX | 46 min |
| Aug 11, 8:39 PM CDT | Severe Thunderstorm Warning | DMX | 66 min |
| Aug 11, 9:07 PM CDT | Mesoscale Discussion | SPC | 53 min |
| Aug 29, 5:08 PM CDT | Special Weather Statement | DMX | 52 min |
| Sep 6, 7:00 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Sep 7, 5:34 AM CDT | Special Weather Statement | DMX | 41 min |
| Sep 9, 2:59 PM CDT | Severe Thunderstorm Warning | DMX | 31 min |
| Sep 9, 3:12 PM CDT | Special Weather Statement | DMX | 48 min |
| Oct 6, 1:22 PM CDT | Mesoscale Discussion | SPC | 113 min |
| Oct 12, 3:53 AM CDT | Freeze Warning | DMX | 29 hr |
| Oct 15, 3:24 PM CDT | Dense Fog Advisory | DMX | 20 hr |
| Nov 17, 3:42 PM CST | Wind Advisory | DMX | 38 hr |
| Dec 9, 11:11 AM CST | Winter Weather Advisory | DMX | 40 hr |
| Dec 15, 11:43 AM CST | Winter Weather Advisory | DMX | 57 hr |
| Dec 16, 4:33 AM CST | Wind Chill Warning | DMX | 55 hr |
| Dec 16, 4:33 AM CST | Wind Chill Advisory | DMX | 55 hr |
| Dec 24, 1:50 AM CST | Dense Fog Advisory | DMX | 26 hr |
| Dec 29, 3:40 AM CST | Wind Advisory | DMX | 13 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 archive20152017
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.