Alert archive / Iowa / Shelby County
Weather alerts in Shelby County, Iowa, 2013
100 weather alerts in 2013, 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 2013. Tap one for its archive.
- Alerts
- 100
- Warnings
- 10
- Watches
- 16
- Advisories
- 29
- Busiest month
- May26 alerts
- Busiest day
- August 6, 20137 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, 2013
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 7 | 2 | 71% | 2 | 0% | |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2013
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Omaha, NE: tornado warnings | 23 | 7 | 70% | 19 | 79% | 16 min |
| NWS Omaha, NE: severe thunderstorm warnings | 229 | 124 | 46% | 266 | 82% | 16 min |
| NWS Omaha, NE: flash flood warnings | 22 | 12 | 45% | 16 | 94% | 37 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 10, 7:31 PM CST | Dense Fog Advisory | OAX | 16 hr |
| Jan 27, 3:22 PM CST | Dense Fog Advisory | OAX | 35 hr |
| Jan 29, 4:00 AM CST | Winter Weather Advisory | OAX | 29 hr |
| Jan 29, 8:29 PM CST | Mesoscale Discussion | SPC | 4 hr |
| Jan 30, 3:25 PM CST | Wind Chill Advisory | OAX | 35 hr |
| Feb 9, 3:17 PM CST | Wind Advisory | OAX | 36 hr |
| Feb 18, 9:57 AM CST | Special Weather Statement | OAX | 78 min |
| Feb 18, 11:07 AM CST | Special Weather Statement | OAX | 83 min |
| Feb 18, 3:15 PM CST | Winter Storm Watch | OAX | 49 hr |
| Feb 19, 4:09 PM CST | Winter Storm Warning | OAX | 60 hr |
| Feb 22, 4:09 AM CST | Winter Weather Advisory | OAX | 5 hr |
| Mar 4, 3:54 AM CST | Wind Advisory | OAX | 35 hr |
| Mar 9, 3:39 AM CST | Winter Storm Warning | OAX | 46 hr |
| Mar 9, 3:39 AM CST | Winter Weather Advisory | OAX | 45 hr |
| Mar 10, 1:16 PM CDT | Mesoscale Discussion | SPC | 5 hr |
| Mar 12, 1:53 PM CDT | Special Weather Statement | OAX | 3 hr |
| Apr 9, 5:12 AM CDT | Mesoscale Discussion | SPC | 93 min |
| Apr 9, 7:37 PM CDT | Mesoscale Discussion | SPC | 83 min |
| Apr 27, 3:45 AM CDT | Dense Fog Advisory | OAX | 6 hr |
| Apr 29, 7:26 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| May 1, 3:53 PM CDT | Winter Weather Advisory | OAX | 18 hr |
| May 1, 8:10 PM CDT | Mesoscale Discussion | SPC | 4 hr |
| May 8, 10:51 PM CDT | Special Weather Statement | OAX | 39 min |
| May 9, 3:19 PM CDT | Special Weather Statement | OAX | 86 min |
| May 11, 2:56 PM CDT | Frost Advisory | OAX | 17 hr |
| May 13, 3:36 PM CDT | Fire Weather Watch | OAX | 12 hr |
| May 14, 3:55 AM CDT | Red Flag Warning | OAX | 17 hr |
| May 16, 6:23 PM CDT | Severe Thunderstorm Warning | OAX | 37 min |
| May 18, 8:33 PM CDT | Mesoscale Discussion | SPC | 117 min |
| May 18, 9:26 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| May 19, 1:03 AM CDT | Severe Thunderstorm Warning | OAX | 27 min |
| May 19, 1:48 AM CDT | Mesoscale Discussion | SPC | 87 min |
| May 19, 2:59 PM CDT | Tornado Watch | SPC | 8 hr |
| May 19, 4:17 PM CDT | Severe Thunderstorm Warning | OAX | 28 min |
| May 19, 7:13 PM CDT | Mesoscale Discussion | SPC | 62 min |
| May 20, 6:49 PM CDT | Special Weather Statement | OAX | 26 min |
| May 25, 3:36 PM CDT | Flash Flood Watch | OAX | 12 hr |
| May 26, 11:03 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 27, 1:40 AM CDT | Mesoscale Discussion | SPC | 95 min |
| May 27, 2:29 AM CDT | Severe Thunderstorm Warning | OAX | 31 min |
| May 27, 2:58 AM CDT | Severe Thunderstorm Warning | OAX | 32 min |
| May 27, 3:24 PM CDT | Areal Flood Advisory | OAX | 12 hr |
| May 29, 8:54 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 29, 10:13 AM CDT | Flash Flood Watch | OAX | 28 hr |
| May 29, 6:24 PM CDT | Tornado Watch | SPC | 4 hr |
| May 30, 7:41 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 8, 3:56 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 8, 5:39 PM CDT | Mesoscale Discussion | SPC | 96 min |
| Jun 8, 7:44 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 14, 3:10 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 14, 3:37 PM CDT | Tornado Watch | SPC | 6 hr |
| Jun 14, 9:27 PM CDT | Special Weather Statement | OAX | 33 min |
| Jun 22, 9:55 AM CDT | Special Weather Statement | OAX | 35 min |
| Jun 23, 4:58 AM CDT | Special Weather Statement | OAX | 47 min |
| Jun 23, 7:54 PM CDT | Mesoscale Discussion | SPC | 96 min |
| Jun 24, 12:53 AM CDT | Special Weather Statement | OAX | 37 min |
| Jun 25, 8:23 PM CDT | Mesoscale Discussion | SPC | 97 min |
| Jul 7, 9:14 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 8, 3:20 PM CDT | Heat Advisory | OAX | 28 hr |
| Jul 22, 3:08 PM CDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jul 22, 5:45 PM CDT | Mesoscale Discussion | SPC | 60 min |
| Jul 22, 7:42 PM CDT | Mesoscale Discussion | SPC | 63 min |
| Jul 22, 8:15 PM CDT | Severe Thunderstorm Warning | OAX | 15 min |
| Jul 25, 5:18 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jul 30, 3:40 PM CDT | Dense Fog Advisory | OAX | 17 hr |
| Aug 6, 5:07 AM CDT | Mesoscale Discussion | SPC | 83 min |
| Aug 6, 5:16 AM CDT | Dense Fog Advisory | OAX | 4 hr |
| Aug 6, 6:35 AM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Aug 6, 7:41 AM CDT | Severe Thunderstorm Warning | OAX | 34 min |
| Aug 6, 9:26 AM CDT | Mesoscale Discussion | SPC | 64 min |
| Aug 6, 5:22 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 6, 6:51 PM CDT | Severe Thunderstorm Watch | SPC | 3 hr |
| Aug 6, 9:37 PM CDT | Mesoscale Discussion | SPC | 113 min |
| Aug 25, 3:27 AM CDT | Heat Advisory | OAX | 64 hr |
| Aug 30, 3:39 AM CDT | Heat Advisory | OAX | 15 hr |
| Sep 1, 1:10 AM CDT | Mesoscale Discussion | SPC | 95 min |
| Sep 1, 3:01 AM CDT | Special Weather Statement | OAX | 44 min |
| Sep 1, 3:26 AM CDT | Special Weather Statement | OAX | 34 min |
| Sep 18, 3:11 AM CDT | Special Weather Statement | OAX | 19 min |
| Sep 19, 8:47 AM CDT | Special Weather Statement | OAX | 43 min |
| Sep 19, 1:19 PM CDT | Mesoscale Discussion | SPC | 86 min |
| Oct 3, 12:24 AM CDT | Special Weather Statement | OAX | 51 min |
| Oct 3, 8:16 PM CDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Oct 3, 11:42 PM CDT | Mesoscale Discussion | SPC | 93 min |
| Oct 4, 2:06 AM CDT | Mesoscale Discussion | SPC | 84 min |
| Oct 4, 1:28 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Oct 4, 2:38 PM CDT | Tornado Watch | SPC | 7 hr |
| Oct 4, 5:20 PM CDT | Mesoscale Discussion | SPC | 85 min |
| Oct 12, 3:20 PM CDT | Frost Advisory | OAX | 17 hr |
| Nov 2, 3:55 PM CDT | Wind Advisory | OAX | 27 hr |
| Nov 8, 8:45 AM CST | Wind Advisory | OAX | 7 hr |
| Nov 21, 11:54 AM CST | Winter Weather Advisory | OAX | 12 hr |
| Dec 4, 3:20 AM CST | Winter Weather Advisory | OAX | 6 hr |
| Dec 6, 3:43 PM CST | Wind Chill Advisory | OAX | 17 hr |
| Dec 7, 3:47 PM CST | Winter Weather Advisory | OAX | 22 hr |
| Dec 8, 3:34 AM CST | Wind Chill Advisory | OAX | 31 hr |
| Dec 13, 3:26 PM CST | Winter Weather Advisory | OAX | 6 hr |
| Dec 22, 3:40 AM CST | Wind Chill Advisory | OAX | 32 hr |
| Dec 23, 4:02 AM CST | Wind Chill Advisory | OAX | 28 hr |
| Dec 28, 3:27 PM CST | Wind Advisory | OAX | 15 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 | 7 |
| Severe Thunderstorm Watch | 8 |
| Tornado Watch | 4 |
| Mesoscale Discussion | 30 |
| Special Weather Statement | 15 |
| Flooding | |
| Flash Flood Watch | 2 |
| Areal Flood Advisory | 1 |
| Winter | |
| Winter Storm Warning | 2 |
| Winter Storm Watch | 1 |
| Winter Weather Advisory | 8 |
| Heat | |
| Heat Advisory | 3 |
| Cold | |
| Frost Advisory | 2 |
| Wind Chill Advisory | 5 |
| Wind and dust | |
| Wind Advisory | 5 |
| Fire | |
| Red Flag Warning | 1 |
| Fire Weather Watch | 1 |
| 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 archive20122014
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.