Alert archive / Iowa / Shelby County
Weather alerts in Shelby County, Iowa, 2010
165 weather alerts in 2010, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Shelby County and its neighbors
Each county as a circle sized by its count in 2010. Tap one for its archive.
- Alerts
- 165
- Warnings
- 20
- Watches
- 41
- Advisories
- 45
- Busiest month
- June48 alerts
- Busiest day
- June 5, 20107 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Shelby County, 2010
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 13 | 7 | 46% | 5 | 80% | 7 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2010
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Omaha, NE: tornado warnings | 26 | 6 | 77% | 10 | 80% | 10 min |
| NWS Omaha, NE: severe thunderstorm warnings | 294 | 173 | 41% | 376 | 87% | 19 min |
| NWS Omaha, NE: flash flood warnings | 29 | 13 | 55% | 31 | 74% | 106 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, 3:57 PM CST | Wind Chill Advisory | OAX | 18 hr |
| Jan 3, 9:16 PM CST | Wind Chill Advisory | OAX | 13 hr |
| Jan 4, 8:33 PM CST | Wind Chill Advisory | OAX | 12 hr |
| Jan 5, 3:40 AM CST | Winter Storm Watch | OAX | 12 hr |
| Jan 5, 3:42 PM CST | Winter Storm Warning | OAX | 44 hr |
| Jan 7, 3:53 AM CST | Wind Chill Warning | OAX | 32 hr |
| Jan 7, 3:53 AM CST | Winter Weather Advisory | OAX | 17 hr |
| Jan 8, 11:59 AM CST | Wind Chill Advisory | OAX | 16 hr |
| Jan 8, 4:20 PM CST | Wind Chill Warning | OAX | 11 hr |
| Jan 16, 2:46 AM CST | Freezing Fog Advisory | OAX | 9 hr |
| Jan 16, 5:58 PM CST | Dense Fog Advisory | OAX | 18 hr |
| Jan 17, 11:53 AM CST | Dense Fog Advisory | OAX | 40 hr |
| Jan 19, 3:58 AM CST | Freezing Fog Advisory | OAX | 8 hr |
| Jan 19, 4:57 AM CST | Winter Storm Watch | OAX | 10 hr |
| Jan 19, 3:20 PM CST | Ice Storm Warning | OAX | 24 hr |
| Jan 19, 11:54 PM CST | Mesoscale Discussion | SPC | 5 hr |
| Jan 24, 3:11 PM CST | Wind Advisory | OAX | 27 hr |
| Jan 24, 7:01 PM CST | Winter Weather Advisory | OAX | 23 hr |
| Jan 25, 10:02 AM CST | Blizzard Warning | OAX | 11 hr |
| Jan 25, 7:27 PM CST | Winter Weather Advisory | OAX | 8 hr |
| Feb 3, 3:33 PM CST | Winter Weather Advisory | OAX | 44 hr |
| Feb 14, 7:58 AM CST | Winter Weather Advisory | OAX | 7 hr |
| Feb 14, 8:25 PM CST | Winter Weather Advisory | OAX | 12 hr |
| Feb 14, 9:43 PM CST | Wind Advisory | OAX | 6 hr |
| Feb 19, 3:56 PM CST | Winter Storm Watch | OAX | 23 hr |
| Feb 20, 3:00 PM CST | Winter Weather Advisory | OAX | 27 hr |
| Mar 9, 1:39 PM CST | Dense Fog Advisory | OAX | 14 hr |
| Mar 19, 3:50 PM CDT | Winter Weather Advisory | OAX | 14 hr |
| Apr 5, 4:04 PM CDT | Mesoscale Discussion | SPC | 56 min |
| Apr 5, 10:39 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Apr 5, 11:54 PM CDT | Severe Thunderstorm Warning | OAX | 36 min |
| Apr 6, 1:20 AM CDT | Mesoscale Discussion | SPC | 85 min |
| Apr 23, 7:28 PM CDT | Tornado Watch | SPC | 5 hr |
| Apr 23, 10:58 PM CDT | Tornado Watch | SPC | 5 hr |
| Apr 24, 1:29 PM CDT | Mesoscale Discussion | SPC | 91 min |
| Apr 28, 10:35 AM CDT | Wind Advisory | OAX | 8 hr |
| Apr 29, 4:00 AM CDT | Wind Advisory | OAX | 15 hr |
| Apr 29, 4:39 PM CDT | Tornado Watch | SPC | 7 hr |
| Apr 29, 7:12 PM CDT | Mesoscale Discussion | SPC | 63 min |
| Apr 29, 8:23 PM CDT | Mesoscale Discussion | SPC | 67 min |
| Apr 29, 11:21 PM CDT | Mesoscale Discussion | SPC | 54 min |
| Apr 29, 11:46 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| May 7, 4:21 AM CDT | Wind Advisory | OAX | 15 hr |
| May 8, 3:09 PM CDT | Frost Advisory | OAX | 16 hr |
| May 22, 3:58 AM CDT | Wind Advisory | OAX | 16 hr |
| May 22, 6:28 AM CDT | Mesoscale Discussion | SPC | 92 min |
| Jun 1, 10:21 AM CDT | Mesoscale Discussion | SPC | 54 min |
| Jun 1, 1:36 PM CDT | Mesoscale Discussion | SPC | 54 min |
| Jun 1, 1:53 PM CDT | Tornado Watch | SPC | 9 hr |
| Jun 1, 5:39 PM CDT | Mesoscale Discussion | SPC | 96 min |
| Jun 1, 6:15 PM CDT | Severe Thunderstorm Warning | OAX | 45 min |
| Jun 4, 11:10 PM CDT | Mesoscale Discussion | SPC | 65 min |
| Jun 4, 11:32 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 5, 1:19 AM CDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 5, 2:29 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 5, 4:00 AM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jun 5, 4:39 AM CDT | Flood Watch | OAX | 7 hr |
| Jun 5, 2:31 PM CDT | Mesoscale Discussion | SPC | 119 min |
| Jun 7, 4:12 AM CDT | Flash Flood Watch | OAX | 27 hr |
| Jun 8, 2:56 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 10, 6:44 AM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 10, 10:02 AM CDT | Mesoscale Discussion | SPC | 88 min |
| Jun 11, 3:43 PM CDT | Flash Flood Watch | OAX | 15 hr |
| Jun 12, 1:00 AM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 12, 3:16 AM CDT | Mesoscale Discussion | SPC | 59 min |
| Jun 13, 5:28 AM CDT | Flood Watch | OAX | 25 hr |
| Jun 17, 1:54 PM CDT | Tornado Watch | SPC | 8 hr |
| Jun 17, 3:31 PM CDT | Mesoscale Discussion | SPC | 59 min |
| Jun 17, 3:53 PM CDT | Flash Flood Watch | OAX | 7 hr |
| Jun 17, 5:32 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 17, 7:39 PM CDT | Mesoscale Discussion | SPC | 96 min |
| Jun 17, 8:24 PM CDT | Severe Thunderstorm Warning | OAX | 51 min |
| Jun 17, 9:06 PM CDT | Severe Thunderstorm Warning | OAX | 39 min |
| Jun 18, 4:54 AM CDT | Flood Watch | OAX | 54 hr |
| Jun 18, 7:47 AM CDT | Mesoscale Discussion | SPC | 88 min |
| Jun 18, 8:43 AM CDT | Severe Thunderstorm Warning | OAX | 14 min |
| Jun 18, 2:49 PM CDT | Tornado Watch | SPC | 7 hr |
| Jun 20, 5:04 AM CDT | Flash Flood Watch | OAX | 26 hr |
| Jun 20, 8:07 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 22, 1:01 AM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 22, 3:37 PM CDT | Mesoscale Discussion | SPC | 23 min |
| Jun 22, 3:53 PM CDT | Flash Flood Watch | OAX | 12 hr |
| Jun 22, 6:30 PM CDT | Tornado Watch | SPC | 6 hr |
| Jun 22, 7:08 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 22, 11:08 PM CDT | Severe Thunderstorm Warning | OAX | 52 min |
| Jun 22, 11:47 PM CDT | Mesoscale Discussion | SPC | 88 min |
| Jun 23, 12:01 AM CDT | Severe Thunderstorm Watch | SPC | 3 hr |
| Jun 25, 5:32 PM CDT | Mesoscale Discussion | SPC | 118 min |
| Jun 25, 11:37 PM CDT | Mesoscale Discussion | SPC | 83 min |
| Jun 26, 1:52 AM CDT | Mesoscale Discussion | SPC | 83 min |
| Jun 26, 3:37 AM CDT | Heat Advisory | OAX | 15 hr |
| Jun 26, 4:50 PM CDT | Tornado Watch | SPC | 7 hr |
| Jun 27, 12:37 AM CDT | Severe Thunderstorm Watch | SPC | 3 hr |
| Jun 27, 2:06 AM CDT | Mesoscale Discussion | SPC | 84 min |
| Jul 7, 2:54 PM CDT | Mesoscale Discussion | SPC | 96 min |
| Jul 13, 3:43 PM CDT | Heat Advisory | OAX | 28 hr |
| Jul 14, 2:30 PM CDT | Mesoscale Discussion | SPC | 90 min |
| Jul 14, 4:52 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 14, 6:46 PM CDT | Severe Thunderstorm Warning | OAX | 29 min |
| Jul 16, 3:22 PM CDT | Heat Advisory | OAX | 28 hr |
| Jul 16, 4:41 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 16, 7:28 PM CDT | Mesoscale Discussion | SPC | 92 min |
| Jul 17, 11:59 PM CDT | Mesoscale Discussion | SPC | 91 min |
| Jul 18, 1:07 AM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 18, 2:31 AM CDT | Mesoscale Discussion | SPC | 59 min |
| Jul 19, 3:00 AM CDT | Mesoscale Discussion | SPC | 60 min |
| Jul 19, 3:38 AM CDT | Severe Thunderstorm Warning | OAX | 39 min |
| Jul 22, 2:06 PM CDT | Mesoscale Discussion | SPC | 114 min |
| Jul 22, 8:25 PM CDT | Mesoscale Discussion | SPC | 95 min |
| Jul 27, 3:55 AM CDT | Heat Advisory | OAX | 8 hr |
| Jul 31, 3:10 AM CDT | Dense Fog Advisory | OAX | 6 hr |
| Aug 2, 4:14 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 2, 3:55 PM CDT | Mesoscale Discussion | SPC | 65 min |
| Aug 3, 12:04 AM CDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 3, 9:47 PM CDT | Mesoscale Discussion | SPC | 58 min |
| Aug 6, 3:13 PM CDT | Excessive Heat Watch | OAX | 24 hr |
| Aug 7, 3:30 PM CDT | Excessive Heat Warning | OAX | 6 days |
| Aug 8, 2:19 PM CDT | Mesoscale Discussion | SPC | 86 min |
| Aug 8, 3:02 PM CDT | Flash Flood Watch | OAX | 8 hr |
| Aug 8, 5:47 PM CDT | Mesoscale Discussion | SPC | 58 min |
| Aug 8, 7:05 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 8, 8:57 PM CDT | Mesoscale Discussion | SPC | 63 min |
| Aug 8, 10:03 PM CDT | Severe Thunderstorm Warning | OAX | 57 min |
| Aug 8, 10:14 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 8, 10:30 PM CDT | Severe Thunderstorm Warning | OAX | 30 min |
| Aug 8, 11:19 PM CDT | Mesoscale Discussion | SPC | 86 min |
| Aug 10, 1:32 PM CDT | Mesoscale Discussion | SPC | 58 min |
| Aug 10, 1:46 PM CDT | Tornado Watch | SPC | 6 hr |
| Aug 13, 9:16 AM CDT | Mesoscale Discussion | SPC | 119 min |
| Aug 13, 10:36 AM CDT | Mesoscale Discussion | SPC | 84 min |
| Aug 16, 2:50 PM CDT | Mesoscale Discussion | SPC | 85 min |
| Aug 22, 3:15 AM CDT | Dense Fog Advisory | OAX | 6 hr |
| Aug 31, 3:26 PM CDT | Mesoscale Discussion | SPC | 34 min |
| Aug 31, 4:57 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Sep 1, 6:19 PM CDT | Mesoscale Discussion | SPC | 116 min |
| Sep 15, 3:42 PM CDT | Mesoscale Discussion | SPC | 93 min |
| Sep 15, 7:32 PM CDT | Mesoscale Discussion | SPC | 28 min |
| Sep 17, 6:20 PM CDT | Mesoscale Discussion | SPC | 85 min |
| Sep 17, 11:12 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Sep 18, 1:00 AM CDT | Mesoscale Discussion | SPC | 60 min |
| Sep 18, 4:42 AM CDT | Mesoscale Discussion | SPC | 63 min |
| Sep 18, 11:20 AM CDT | Severe Thunderstorm Warning | OAX | 25 min |
| Sep 18, 8:26 PM CDT | Mesoscale Discussion | SPC | 94 min |
| Sep 18, 11:41 PM CDT | Severe Thunderstorm Warning | OAX | 49 min |
| Sep 19, 12:32 AM CDT | Severe Thunderstorm Warning | OAX | 43 min |
| Sep 20, 2:07 AM CDT | Dense Fog Advisory | OAX | 7 hr |
| Sep 23, 3:15 AM CDT | Flash Flood Watch | OAX | 8 hr |
| Oct 2, 3:24 AM CDT | Frost Advisory | OAX | 30 hr |
| Oct 25, 3:33 PM CDT | Wind Advisory | OAX | 28 hr |
| Oct 26, 3:41 AM CDT | Wind Advisory | OAX | 39 hr |
| Nov 12, 8:02 PM CST | Winter Weather Advisory | OAX | 10 hr |
| Nov 12, 9:19 PM CST | Mesoscale Discussion | SPC | 4 hr |
| Nov 24, 3:21 PM CST | Freezing Rain Advisory | OAX | 3 hr |
| Nov 28, 3:37 AM CST | Wind Advisory | OAX | 14 hr |
| Nov 30, 4:29 AM CST | Winter Weather Advisory | OAX | 5 hr |
| Dec 10, 3:15 PM CST | Wind Advisory | OAX | 33 hr |
| Dec 10, 10:08 PM CST | Blizzard Warning | OAX | 30 hr |
| Dec 10, 10:08 PM CST | Winter Weather Advisory | OAX | 26 hr |
| Dec 11, 3:42 PM CST | Wind Chill Advisory | OAX | 20 hr |
| Dec 15, 3:06 PM CST | Winter Weather Advisory | OAX | 7 hr |
| Dec 23, 4:10 AM CST | Winter Weather Advisory | OAX | 36 hr |
| Dec 29, 3:52 PM CST | Winter Storm Watch | OAX | 24 hr |
| Dec 29, 5:30 PM CST | Dense Fog Advisory | OAX | 9 hr |
| Dec 30, 3:37 PM CST | Winter Weather Advisory | OAX | 21 hr |
| Dec 31, 9:29 AM CST | Mesoscale Discussion | SPC | 5 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 | 13 |
| Severe Thunderstorm Watch | 17 |
| Tornado Watch | 9 |
| Mesoscale Discussion | 59 |
| Flooding | |
| Flash Flood Watch | 7 |
| Flood Watch | 3 |
| Winter | |
| Blizzard Warning | 2 |
| Ice Storm Warning | 1 |
| Winter Storm Warning | 1 |
| Winter Storm Watch | 4 |
| Freezing Rain Advisory | 1 |
| Winter Weather Advisory | 14 |
| Heat | |
| Excessive Heat Warning | 1 |
| Excessive Heat Watch | 1 |
| Heat Advisory | 4 |
| Cold | |
| Wind Chill Warning | 2 |
| Frost Advisory | 2 |
| Wind Chill Advisory | 5 |
| Wind and dust | |
| Wind Advisory | 10 |
| Fog and smoke | |
| Dense Fog Advisory | 7 |
| Freezing Fog Advisory | 2 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20092011
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.