Alert archive / Iowa / Crawford County
Weather alerts in Crawford County, Iowa, 2011
112 weather alerts in 2011, 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 2011. Tap one for its archive.
- Alerts
- 112
- Warnings
- 20
- Watches
- 26
- Advisories
- 33
- Busiest month
- June28 alerts
- Busiest day
- June 20, 20117 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
2 of 3 tornado warnings covering Crawford County in 2011 had a tornado report inside them; 2 of 3 tornado reports fell inside a warning, on average 14 minutes after it went out.
Crawford County, 2011
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 3 | 2 | 33% | 3 | 67% | 14 min |
| Severe thunderstorm warnings | 11 | 6 | 45% | 12 | 67% | 28 min |
| Flash flood warnings | 1 | 0 | 100% | 0 |
Each office's whole area, 2011
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Des Moines, IA: tornado warnings | 58 | 19 | 67% | 53 | 75% | 27 min |
| NWS Des Moines, IA: severe thunderstorm warnings | 313 | 174 | 44% | 468 | 74% | 22 min |
| NWS Des Moines, IA: flash flood warnings | 34 | 13 | 62% | 30 | 87% | 136 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 8, 3:13 PM CST | Winter Storm Watch | DMX | 24 hr |
| Jan 9, 3:20 PM CST | Winter Weather Advisory | DMX | 51 hr |
| Jan 11, 5:56 PM CST | Wind Chill Advisory | DMX | 15 hr |
| Jan 22, 4:05 AM CST | Winter Weather Advisory | DMX | 29 hr |
| Jan 28, 9:29 AM CST | Dense Fog Advisory | DMX | 3 hr |
| Jan 30, 4:01 AM CST | Winter Weather Advisory | DMX | 68 hr |
| Feb 1, 4:02 AM CST | Wind Chill Advisory | DMX | 32 hr |
| Feb 2, 3:09 PM CST | Wind Chill Advisory | DMX | 18 hr |
| Feb 7, 3:35 AM CST | Wind Chill Advisory | DMX | 32 hr |
| Feb 8, 3:44 PM CST | Wind Chill Advisory | DMX | 20 hr |
| Feb 16, 6:00 PM CST | Dense Fog Advisory | DMX | 16 hr |
| Mar 8, 4:15 AM CST | Winter Storm Watch | DMX | 11 hr |
| Mar 8, 3:39 PM CST | Winter Weather Advisory | DMX | 18 hr |
| Mar 22, 1:19 PM CDT | Mesoscale Discussion | SPC | 116 min |
| Mar 22, 2:03 PM CDT | Tornado Watch | SPC | 7 hr |
| Mar 22, 4:55 PM CDT | Tornado Warning | DMX | 35 min |
| Mar 22, 5:29 PM CDT | Tornado Warning | DMX | 35 min |
| Apr 3, 3:47 PM CDT | Wind Advisory | DMX | 26 hr |
| Apr 9, 5:00 PM CDT | Mesoscale Discussion | SPC | 60 min |
| Apr 9, 5:48 PM CDT | Tornado Watch | SPC | 7 hr |
| Apr 9, 7:09 PM CDT | Tornado Warning | DMX | 51 min |
| Apr 9, 9:06 PM CDT | Mesoscale Discussion | SPC | 54 min |
| May 1, 3:36 PM CDT | Frost Advisory | DMX | 16 hr |
| May 2, 3:48 PM CDT | Frost Advisory | DMX | 15 hr |
| May 3, 4:05 PM CDT | Freeze Warning | DMX | 15 hr |
| May 11, 2:31 PM CDT | Mesoscale Discussion | SPC | 59 min |
| May 11, 2:53 PM CDT | Tornado Watch | SPC | 6 hr |
| May 12, 5:35 PM CDT | Mesoscale Discussion | SPC | 85 min |
| May 12, 6:05 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 12, 8:01 PM CDT | Severe Thunderstorm Warning | DMX | 44 min |
| May 15, 3:24 PM CDT | Frost Advisory | DMX | 16 hr |
| May 21, 12:51 PM CDT | Mesoscale Discussion | SPC | 114 min |
| May 21, 2:25 PM CDT | Severe Thunderstorm Watch | SPC | 10 hr |
| May 21, 6:07 PM CDT | Mesoscale Discussion | SPC | 53 min |
| May 21, 8:41 PM CDT | Severe Thunderstorm Warning | DMX | 34 min |
| May 21, 8:55 PM CDT | Mesoscale Discussion | SPC | 65 min |
| May 25, 4:22 AM CDT | Wind Advisory | DMX | 17 hr |
| May 29, 9:24 PM CDT | Mesoscale Discussion | SPC | 96 min |
| May 30, 3:41 AM CDT | Wind Advisory | DMX | 15 hr |
| Jun 7, 4:05 AM CDT | Wind Advisory | DMX | 15 hr |
| Jun 9, 9:50 AM CDT | Mesoscale Discussion | SPC | 55 min |
| Jun 9, 3:44 PM CDT | Flash Flood Watch | DMX | 12 hr |
| Jun 9, 9:48 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 9, 11:45 PM CDT | Mesoscale Discussion | SPC | 90 min |
| Jun 10, 1:39 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 17, 6:44 PM CDT | Mesoscale Discussion | SPC | 91 min |
| Jun 17, 7:09 PM CDT | Severe Thunderstorm Watch | SPC | 3 hr |
| Jun 18, 10:34 AM CDT | Flash Flood Warning | DMX | 4 hr |
| Jun 19, 6:51 PM CDT | Tornado Watch | SPC | 7 hr |
| Jun 19, 9:16 PM CDT | Mesoscale Discussion | SPC | 59 min |
| Jun 20, 1:40 AM CDT | Mesoscale Discussion | SPC | 35 min |
| Jun 20, 3:27 AM CDT | Mesoscale Discussion | SPC | 33 min |
| Jun 20, 3:46 AM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jun 20, 3:08 PM CDT | Tornado Watch | SPC | 7 hr |
| Jun 20, 3:14 PM CDT | Flash Flood Watch | DMX | 12 hr |
| Jun 20, 6:53 PM CDT | Tornado Watch | SPC | 6 hr |
| Jun 20, 7:46 PM CDT | Mesoscale Discussion | SPC | 59 min |
| Jun 20, 8:43 PM CDT | Severe Thunderstorm Warning | DMX | 47 min |
| Jun 20, 9:02 PM CDT | Mesoscale Discussion | SPC | 58 min |
| Jun 20, 9:33 PM CDT | Severe Thunderstorm Warning | DMX | 42 min |
| Jun 26, 6:16 AM CDT | Mesoscale Discussion | SPC | 59 min |
| Jun 26, 3:42 PM CDT | Flash Flood Watch | DMX | 14 hr |
| Jun 26, 4:56 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 26, 7:45 PM CDT | Severe Thunderstorm Warning | DMX | 60 min |
| Jun 26, 9:46 PM CDT | High Wind Warning | DMX | 5 hr |
| Jun 29, 3:44 AM CDT | Excessive Heat Watch | DMX | 12 hr |
| Jun 29, 3:38 PM CDT | Heat Advisory | DMX | 51 hr |
| Jul 1, 6:51 PM CDT | Severe Thunderstorm Warning | DMX | 39 min |
| Jul 5, 3:32 PM CDT | Mesoscale Discussion | SPC | 88 min |
| Jul 11, 1:08 AM CDT | Severe Thunderstorm Watch | SPC | 13 min |
| Jul 11, 1:21 AM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jul 12, 2:09 AM CDT | Mesoscale Discussion | SPC | 66 min |
| Jul 14, 3:37 PM CDT | Excessive Heat Watch | DMX | 24 hr |
| Jul 15, 2:21 PM CDT | Mesoscale Discussion | SPC | 114 min |
| Jul 15, 3:32 PM CDT | Excessive Heat Warning | DMX | 6 days |
| Jul 22, 3:00 PM CDT | Mesoscale Discussion | SPC | 90 min |
| Jul 22, 4:12 PM CDT | Heat Advisory | DMX | 24 hr |
| Jul 28, 5:18 AM CDT | Severe Thunderstorm Warning | DMX | 57 min |
| Jul 28, 2:47 PM CDT | Mesoscale Discussion | SPC | 118 min |
| Jul 30, 3:47 PM CDT | Heat Advisory | DMX | 72 hr |
| Aug 6, 2:58 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 6, 5:32 PM CDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Aug 6, 7:34 PM CDT | Severe Thunderstorm Warning | DMX | 26 min |
| Aug 6, 7:57 PM CDT | Severe Thunderstorm Warning | DMX | 48 min |
| Aug 6, 8:10 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 7, 10:28 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 7, 11:34 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Aug 8, 12:11 AM CDT | Severe Thunderstorm Warning | DMX | 49 min |
| Aug 18, 12:31 PM CDT | Mesoscale Discussion | SPC | 89 min |
| Aug 18, 1:27 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Aug 18, 2:13 PM CDT | Severe Thunderstorm Warning | DMX | 47 min |
| Aug 22, 1:42 AM CDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 23, 12:45 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 28, 8:00 AM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Aug 28, 10:41 AM CDT | Mesoscale Discussion | SPC | 94 min |
| Aug 31, 3:45 AM CDT | Dense Fog Advisory | DMX | 5 hr |
| Sep 2, 2:41 PM CDT | Mesoscale Discussion | SPC | 94 min |
| Sep 14, 3:52 AM CDT | Frost Advisory | DMX | 28 hr |
| Sep 18, 10:54 PM CDT | Dense Fog Advisory | DMX | 10 hr |
| Sep 30, 3:29 PM CDT | Frost Advisory | DMX | 17 hr |
| Oct 7, 4:08 AM CDT | Wind Advisory | DMX | 15 hr |
| Oct 11, 3:06 AM CDT | Dense Fog Advisory | DMX | 7 hr |
| Oct 18, 9:30 PM CDT | Freeze Warning | DMX | 11 hr |
| Nov 4, 3:57 PM CDT | Wind Advisory | DMX | 36 hr |
| Nov 8, 3:42 AM CST | Winter Weather Advisory | DMX | 29 hr |
| Nov 15, 3:25 AM CST | Wind Advisory | DMX | 14 hr |
| Nov 19, 10:16 AM CST | Winter Weather Advisory | DMX | 5 hr |
| Nov 25, 3:31 PM CST | Wind Advisory | DMX | 29 hr |
| Dec 2, 3:49 AM CST | Winter Storm Watch | DMX | 24 hr |
| Dec 3, 3:40 AM CST | Winter Weather Advisory | DMX | 20 hr |
| Dec 3, 10:37 AM CST | Mesoscale Discussion | SPC | 5 hr |
| Dec 3, 6:15 PM CST | Winter Storm Warning | DMX | 6 hr |
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 | 11 |
| Tornado Warning | 3 |
| Severe Thunderstorm Watch | 12 |
| Tornado Watch | 6 |
| Mesoscale Discussion | 33 |
| Flooding | |
| Flash Flood Warning | 1 |
| Flash Flood Watch | 3 |
| Winter | |
| Winter Storm Warning | 1 |
| Winter Storm Watch | 3 |
| Winter Weather Advisory | 7 |
| Heat | |
| Excessive Heat Warning | 1 |
| Excessive Heat Watch | 2 |
| Heat Advisory | 3 |
| Cold | |
| Freeze Warning | 2 |
| Frost Advisory | 5 |
| Wind Chill Advisory | 5 |
| Wind and dust | |
| High Wind Warning | 1 |
| Wind Advisory | 8 |
| Fog and smoke | |
| Dense Fog Advisory | 5 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20102012
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.