Alert archive / Iowa / Crawford County
Weather alerts in Crawford County, Iowa, 2017
93 weather alerts in 2017, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Crawford County and its neighbors
Each county as a circle sized by its count in 2017. Tap one for its archive.
- Alerts
- 93
- Warnings
- 18
- Watches
- 13
- Advisories
- 30
- Busiest month
- January12 alerts
- Busiest day
- March 6, 20178 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Crawford County, 2017
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 10 | 5 | 50% | 6 | 67% | 27 min |
| Flash flood warnings | 2 | 1 | 50% | 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 10, 4:16 AM CST | Winter Weather Advisory | DMX | 14 hr |
| Jan 10, 9:48 AM CST | Wind Advisory | DMX | 8 hr |
| Jan 12, 3:11 PM CST | Winter Storm Watch | DMX | 49 hr |
| Jan 14, 4:13 PM CST | Ice Storm Warning | DMX | 48 hr |
| Jan 14, 4:13 PM CST | Winter Weather Advisory | DMX | 59 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 23, 3:12 PM CST | Winter Storm Warning | DMX | 51 hr |
| Jan 23, 3:12 PM CST | Winter Weather Advisory | DMX | 57 hr |
| Jan 30, 3:52 AM CST | Wind Advisory | DMX | 17 hr |
| Feb 7, 3:48 PM CST | Winter Weather Advisory | DMX | 20 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, 4:31 AM CST | Winter Weather Advisory | DMX | 43 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, 1:08 PM CST | Mesoscale Discussion | SPC | 3 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, 3:50 PM CST | Severe Thunderstorm Warning | DMX | 55 min |
| Mar 6, 4:19 PM CST | Severe Thunderstorm Warning | DMX | 41 min |
| Mar 7, 4:00 AM CST | Red Flag Warning | DMX | 14 hr |
| Apr 3, 1:53 AM CDT | Dense Fog Advisory | DMX | 8 hr |
| Apr 15, 12:03 PM CDT | Special Weather Statement | DMX | 42 min |
| Apr 15, 4:01 PM CDT | Mesoscale Discussion | SPC | 119 min |
| Apr 15, 5:05 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Apr 19, 2:29 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Apr 19, 3:23 PM CDT | Tornado Watch | SPC | 7 hr |
| Apr 19, 6:55 PM CDT | Mesoscale Discussion | SPC | 95 min |
| Apr 19, 7:02 PM CDT | Special Weather Statement | DMX | 43 min |
| Apr 19, 7:18 PM CDT | Severe Thunderstorm Warning | DMX | 31 min |
| May 8, 2:58 AM CDT | Severe Thunderstorm Warning | DMX | 32 min |
| May 15, 3:48 PM CDT | Mesoscale Discussion | SPC | 87 min |
| May 16, 3:58 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 16, 4:57 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 16, 7:02 PM CDT | Severe Thunderstorm Warning | DMX | 43 min |
| May 16, 7:31 PM CDT | Mesoscale Discussion | SPC | 59 min |
| May 16, 7:41 PM CDT | Severe Thunderstorm Warning | DMX | 49 min |
| May 16, 9:43 PM CDT | Mesoscale Discussion | SPC | 62 min |
| May 17, 12:08 PM CDT | Tornado Watch | SPC | 7 hr |
| May 17, 2:25 PM CDT | Mesoscale Discussion | SPC | 65 min |
| Jun 13, 9:36 PM CDT | Mesoscale Discussion | SPC | 54 min |
| Jun 15, 5:11 PM CDT | Mesoscale Discussion | SPC | 64 min |
| Jun 16, 3:53 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 27, 11:33 PM CDT | Mesoscale Discussion | SPC | 57 min |
| Jun 29, 3:42 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 29, 6:08 PM CDT | Mesoscale Discussion | SPC | 67 min |
| Jun 29, 6:15 PM CDT | Severe Thunderstorm Warning | DMX | 45 min |
| Jun 29, 7:05 PM CDT | Severe Thunderstorm Warning | DMX | 40 min |
| Jul 4, 5:10 PM CDT | Special Weather Statement | DMX | 35 min |
| Jul 11, 1:20 AM CDT | Special Weather Statement | DMX | 40 min |
| Jul 11, 1:54 AM CDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 17, 2:58 PM CDT | Excessive Heat Watch | DMX | 24 hr |
| Jul 18, 2:58 PM CDT | Heat Advisory | DMX | 4 days |
| Jul 20, 3:57 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 20, 7:12 PM CDT | Severe Thunderstorm Warning | DMX | 26 min |
| Jul 21, 1:32 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 15, 6:35 PM CDT | Special Weather Statement | DMX | 55 min |
| Aug 18, 2:54 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 18, 4:51 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Aug 20, 11:03 PM CDT | Special Weather Statement | DMX | 27 min |
| Aug 20, 11:05 PM CDT | Severe Thunderstorm Warning | DMX | 40 min |
| Aug 20, 11:14 PM CDT | Mesoscale Discussion | SPC | 91 min |
| Aug 21, 12:32 AM CDT | Flash Flood Warning | DMX | 6 hr |
| Aug 21, 1:31 AM CDT | Flash Flood Warning | DMX | 6 hr |
| Aug 21, 2:35 PM CDT | Mesoscale Discussion | SPC | 85 min |
| Aug 21, 3:43 PM CDT | Special Weather Statement | DMX | 77 min |
| Aug 27, 2:37 AM CDT | Dense Fog Advisory | DMX | 5 hr |
| Sep 15, 6:16 AM CDT | Special Weather Statement | DMX | 59 min |
| Sep 22, 10:20 AM CDT | Heat Advisory | DMX | 9 hr |
| Oct 2, 6:40 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Oct 6, 4:07 AM CDT | Flash Flood Watch | DMX | 23 hr |
| Oct 6, 3:14 PM CDT | Mesoscale Discussion | SPC | 91 min |
| Oct 10, 11:58 PM CDT | Frost Advisory | DMX | 8 hr |
| Oct 15, 3:27 PM CDT | Frost Advisory | DMX | 17 hr |
| Oct 22, 3:10 PM CDT | Wind Advisory | DMX | 51 hr |
| Oct 26, 3:38 PM CDT | Freeze Warning | DMX | 17 hr |
| Oct 26, 3:38 PM CDT | Wind Advisory | DMX | 26 hr |
| Nov 12, 9:36 PM CST | Dense Fog Advisory | DMX | 14 hr |
| Nov 17, 7:39 PM CST | Dense Fog Advisory | DMX | 4 hr |
| Dec 3, 3:41 PM CST | Wind Advisory | DMX | 39 hr |
| Dec 11, 3:24 AM CST | Wind Advisory | DMX | 15 hr |
| Dec 12, 3:57 PM CST | Wind Advisory | DMX | 26 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 29, 3:50 PM CST | Wind Chill Warning | DMX | 4 days |
| Dec 29, 3:50 PM CST | Wind Chill Advisory | DMX | 38 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 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.