Alert archive / Iowa / Clarke County
Weather alerts in Clarke County, Iowa, 2015
128 weather alerts in 2015, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Clarke County and its neighbors
Each county as a circle sized by its count in 2015. Tap one for its archive.
- Alerts
- 128
- Warnings
- 28
- Watches
- 27
- Advisories
- 30
- Busiest month
- June25 alerts
- Busiest day
- November 11, 20158 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
1 of 1 tornado warnings covering Clarke County in 2015 had a tornado report inside them.
Clarke County, 2015
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 1 | 1 | 0% | 0 | ||
| Severe thunderstorm warnings | 14 | 7 | 50% | 7 | 29% | 17 min |
| Flash flood warnings | 1 | 1 | 0% | 1 | 100% | 208 min |
Each office's whole area, 2015
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Des Moines, IA: tornado warnings | 38 | 14 | 63% | 37 | 62% | 13 min |
| NWS Des Moines, IA: severe thunderstorm warnings | 201 | 101 | 50% | 301 | 78% | 19 min |
| NWS Des Moines, IA: flash flood warnings | 39 | 22 | 44% | 86 | 86% | 121 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 3, 3:51 AM CST | Winter Weather Advisory | DMX | 26 hr |
| Jan 5, 4:11 AM CST | Winter Weather Advisory | DMX | 19 hr |
| Jan 6, 4:15 AM CST | Wind Chill Warning | DMX | 32 hr |
| Jan 6, 4:15 AM CST | Wind Chill Advisory | DMX | 53 hr |
| Jan 28, 3:36 PM CST | Wind Advisory | DMX | 17 hr |
| Jan 30, 10:48 AM CST | Winter Storm Watch | DMX | 17 hr |
| Jan 31, 3:31 AM CST | Winter Storm Warning | DMX | 41 hr |
| Jan 31, 10:13 PM CST | Mesoscale Discussion | SPC | 6 hr |
| Feb 3, 3:22 PM CST | Winter Weather Advisory | DMX | 22 hr |
| Feb 4, 7:34 AM CST | Mesoscale Discussion | SPC | 4 hr |
| Feb 17, 3:51 AM CST | Wind Chill Advisory | DMX | 32 hr |
| Feb 20, 3:08 PM CST | Wind Chill Advisory | DMX | 67 hr |
| Feb 24, 11:34 AM CST | Winter Storm Watch | DMX | 4 hr |
| Feb 24, 3:19 PM CST | Winter Weather Advisory | DMX | 30 hr |
| Mar 2, 4:11 PM CST | Winter Weather Advisory | DMX | 19 hr |
| Mar 14, 11:06 AM CDT | Fire Weather Watch | DMX | 17 hr |
| Mar 15, 3:41 AM CDT | Red Flag Warning | DMX | 15 hr |
| Mar 16, 3:43 AM CDT | Red Flag Warning | DMX | 15 hr |
| Mar 28, 3:44 PM CDT | Wind Advisory | DMX | 26 hr |
| Mar 30, 4:14 AM CDT | Red Flag Warning | DMX | 15 hr |
| Mar 31, 3:38 PM CDT | Fire Weather Watch | DMX | 12 hr |
| Apr 1, 3:46 AM CDT | Red Flag Warning | DMX | 15 hr |
| Apr 8, 9:33 AM CDT | Mesoscale Discussion | SPC | 57 min |
| Apr 8, 10:09 AM CDT | Special Weather Statement | DMX | 21 min |
| Apr 8, 11:40 AM CDT | Special Weather Statement | DMX | 20 min |
| Apr 18, 1:29 PM CDT | Severe Thunderstorm Warning | DMX | 31 min |
| Apr 22, 3:23 PM CDT | Freeze Warning | DMX | 17 hr |
| May 10, 9:19 PM CDT | Mesoscale Discussion | SPC | 56 min |
| May 15, 12:05 AM CDT | Dense Fog Advisory | DMX | 9 hr |
| May 25, 5:33 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 25, 8:18 PM CDT | Mesoscale Discussion | SPC | 87 min |
| Jun 6, 11:23 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 7, 1:56 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 7, 3:33 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jun 10, 2:12 PM CDT | Flash Flood Watch | DMX | 38 hr |
| Jun 10, 3:13 PM CDT | Mesoscale Discussion | SPC | 92 min |
| Jun 10, 6:48 PM CDT | Severe Thunderstorm Warning | DMX | 57 min |
| Jun 11, 1:53 PM CDT | Tornado Watch | SPC | 7 hr |
| Jun 20, 3:10 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 20, 3:49 PM CDT | Tornado Watch | SPC | 7 hr |
| Jun 20, 6:33 PM CDT | Mesoscale Discussion | SPC | 57 min |
| Jun 20, 10:12 PM CDT | Mesoscale Discussion | SPC | 63 min |
| Jun 21, 9:49 PM CDT | Severe Thunderstorm Warning | DMX | 39 min |
| Jun 22, 1:22 PM CDT | Mesoscale Discussion | SPC | 113 min |
| Jun 23, 3:59 PM CDT | Flash Flood Watch | DMX | 38 hr |
| Jun 24, 12:39 AM CDT | Mesoscale Discussion | SPC | 66 min |
| Jun 24, 10:19 AM CDT | Mesoscale Discussion | SPC | 116 min |
| Jun 24, 2:23 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 24, 5:58 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 24, 6:21 PM CDT | Tornado Watch | SPC | 5 hr |
| Jun 24, 7:49 PM CDT | Mesoscale Discussion | SPC | 116 min |
| Jun 24, 8:32 PM CDT | Severe Thunderstorm Warning | DMX | 43 min |
| Jun 24, 9:10 PM CDT | Severe Thunderstorm Warning | DMX | 50 min |
| Jun 24, 10:00 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 24, 11:26 PM CDT | Severe Thunderstorm Watch | SPC | 3 hr |
| Jun 25, 6:57 AM CDT | Areal Flood Warning | DMX | 9 hr |
| Jul 11, 7:17 AM CDT | Flash Flood Warning | DMX | 6 hr |
| Jul 11, 3:19 PM CDT | Heat Advisory | DMX | 28 hr |
| Jul 11, 3:19 PM CDT | Heat Advisory | DMX | 52 hr |
| Jul 13, 4:00 AM CDT | Excessive Heat Warning | DMX | 15 hr |
| Jul 15, 9:22 PM CDT | Mesoscale Discussion | SPC | 113 min |
| Jul 15, 11:52 PM CDT | Flash Flood Watch | DMX | 10 hr |
| Jul 17, 3:57 AM CDT | Heat Advisory | DMX | 15 hr |
| Jul 18, 4:12 AM CDT | Heat Advisory | DMX | 12 hr |
| Jul 28, 3:40 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 28, 3:59 PM CDT | Flash Flood Watch | DMX | 11 hr |
| Jul 28, 5:46 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 28, 8:04 PM CDT | Mesoscale Discussion | SPC | 116 min |
| Jul 28, 8:44 PM CDT | Special Weather Statement | DMX | 31 min |
| Jul 28, 9:26 PM CDT | Severe Thunderstorm Warning | DMX | 39 min |
| Aug 2, 4:48 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 2, 6:00 PM CDT | Severe Thunderstorm Warning | DMX | 45 min |
| Aug 2, 6:22 PM CDT | Mesoscale Discussion | SPC | 53 min |
| Aug 2, 6:26 PM CDT | Severe Thunderstorm Warning | DMX | 49 min |
| Aug 2, 6:41 PM CDT | Severe Thunderstorm Warning | DMX | 49 min |
| Aug 2, 6:47 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 8, 3:42 PM CDT | Flash Flood Watch | DMX | 15 hr |
| Aug 8, 8:36 PM CDT | Mesoscale Discussion | SPC | 114 min |
| Aug 8, 8:51 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 8, 11:11 PM CDT | Mesoscale Discussion | SPC | 94 min |
| Aug 9, 1:37 AM CDT | Mesoscale Discussion | SPC | 83 min |
| Aug 10, 12:59 AM CDT | Severe Thunderstorm Warning | DMX | 46 min |
| Aug 22, 2:55 PM CDT | Mesoscale Discussion | SPC | 65 min |
| Aug 22, 3:48 PM CDT | Tornado Watch | SPC | 8 hr |
| Aug 22, 6:21 PM CDT | Mesoscale Discussion | SPC | 84 min |
| Aug 22, 8:49 PM CDT | Mesoscale Discussion | SPC | 116 min |
| Aug 30, 6:08 AM CDT | Dense Fog Advisory | DMX | 4 hr |
| Aug 30, 7:27 PM CDT | Dense Fog Advisory | DMX | 11 hr |
| Sep 6, 4:06 AM CDT | Flash Flood Watch | DMX | 28 hr |
| Sep 6, 6:02 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Sep 6, 8:42 PM CDT | Mesoscale Discussion | SPC | 93 min |
| Sep 6, 11:41 PM CDT | Mesoscale Discussion | SPC | 64 min |
| Sep 7, 4:21 AM CDT | Flash Flood Watch | DMX | 30 hr |
| Sep 17, 5:47 PM CDT | Mesoscale Discussion | SPC | 118 min |
| Sep 17, 6:38 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Sep 17, 10:12 PM CDT | Mesoscale Discussion | SPC | 63 min |
| Sep 18, 10:51 AM CDT | Severe Thunderstorm Warning | DMX | 39 min |
| Sep 18, 1:13 PM CDT | Special Weather Statement | DMX | 62 min |
| Oct 16, 3:54 AM CDT | Frost Advisory | DMX | 29 hr |
| Oct 18, 2:56 PM CDT | Red Flag Warning | DMX | 28 hr |
| Nov 3, 8:35 AM CST | Dense Fog Advisory | DMX | 2 hr |
| Nov 5, 3:17 PM CST | Mesoscale Discussion | SPC | 118 min |
| Nov 5, 4:31 PM CST | Special Weather Statement | DMX | 59 min |
| Nov 10, 3:20 AM CST | High Wind Watch | DMX | 24 hr |
| Nov 10, 3:39 PM CST | High Wind Warning | DMX | 38 hr |
| Nov 10, 3:39 PM CST | Wind Advisory | DMX | 50 hr |
| Nov 11, 10:17 AM CST | Mesoscale Discussion | SPC | 118 min |
| Nov 11, 11:25 AM CST | Tornado Watch | SPC | 6 hr |
| Nov 11, 1:42 PM CST | Mesoscale Discussion | SPC | 93 min |
| Nov 11, 2:13 PM CST | Special Weather Statement | DMX | 92 min |
| Nov 11, 2:23 PM CST | Severe Thunderstorm Warning | DMX | 37 min |
| Nov 11, 2:30 PM CST | Severe Thunderstorm Warning | DMX | 45 min |
| Nov 11, 2:39 PM CST | Tornado Warning | DMX | 21 min |
| Nov 11, 2:55 PM CST | Severe Thunderstorm Warning | DMX | 50 min |
| Nov 11, 10:23 PM CST | Wind Advisory | DMX | 20 hr |
| Nov 18, 3:12 PM CST | Wind Advisory | DMX | 27 hr |
| Nov 20, 4:19 AM CST | Winter Weather Advisory | DMX | 26 hr |
| Nov 26, 4:13 AM CST | Freezing Rain Advisory | DMX | 22 hr |
| Nov 28, 3:55 PM CST | Winter Weather Advisory | DMX | 17 hr |
| Dec 6, 8:12 PM CST | Dense Fog Advisory | DMX | 15 hr |
| Dec 11, 9:44 PM CST | Dense Fog Advisory | DMX | 18 hr |
| Dec 12, 4:10 PM CST | Dense Fog Advisory | DMX | 12 hr |
| Dec 25, 4:38 AM CST | Dense Fog Advisory | DMX | 4 hr |
| Dec 25, 9:10 AM CST | Dense Fog Advisory | DMX | 6 hr |
| Dec 26, 3:46 PM CST | Winter Storm Watch | DMX | 23 hr |
| Dec 27, 4:46 AM CST | Winter Storm Warning | DMX | 49 hr |
| Dec 28, 3:35 AM CST | Mesoscale Discussion | SPC | 6 hr |
| Dec 28, 3:42 PM CST | Mesoscale Discussion | SPC | 4 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 archive20142016
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.