Alert archive / Nebraska / Knox County
Weather alerts in Knox County, Nebraska, 2013
127 weather alerts in 2013, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Knox County and its neighbors
Each county as a circle sized by its count in 2013. Tap one for its archive.
- Alerts
- 127
- Warnings
- 24
- Watches
- 15
- Advisories
- 34
- Busiest month
- May30 alerts
- Busiest day
- August 1, 20138 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 2 tornado warnings covering Knox County in 2013 had a tornado report inside them; 1 of 1 tornado reports fell inside a warning, on average 12 minutes after it went out.
Knox County, 2013
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 2 | 1 | 50% | 1 | 100% | 12 min |
| Severe thunderstorm warnings | 17 | 7 | 59% | 4 | 100% | 10 min |
| Flash flood warnings | 1 | 0 | 100% | 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 11, 3:36 AM CST | Wind Advisory | OAX | 23 hr |
| Jan 27, 3:22 PM CST | Dense Fog Advisory | OAX | 35 hr |
| Jan 30, 3:25 PM CST | Wind Chill Advisory | OAX | 35 hr |
| Feb 9, 3:16 PM CST | Winter Weather Advisory | OAX | 21 hr |
| Feb 9, 3:17 PM CST | Wind Advisory | OAX | 36 hr |
| Feb 10, 12:08 PM CST | Winter Weather Advisory | OAX | 9 hr |
| Feb 14, 4:11 AM CST | Wind Advisory | OAX | 6 hr |
| Feb 14, 10:13 AM CST | Wind Advisory | OAX | 4 hr |
| Feb 17, 9:54 PM CST | Wind Advisory | OAX | 20 hr |
| Feb 18, 3:15 PM CST | Winter Storm Watch | OAX | 49 hr |
| Feb 20, 4:02 PM CST | Winter Weather Advisory | OAX | 36 hr |
| Mar 4, 3:54 AM CST | Wind Advisory | OAX | 35 hr |
| Mar 8, 3:10 PM CST | Winter Storm Watch | OAX | 12 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 18, 3:55 AM CDT | Wind Advisory | OAX | 14 hr |
| Apr 8, 4:14 AM CDT | Winter Storm Watch | OAX | 24 hr |
| Apr 9, 4:02 AM CDT | Winter Storm Warning | OAX | 48 hr |
| Apr 9, 4:01 PM CDT | Special Weather Statement | OAX | 29 min |
| Apr 17, 3:35 PM CDT | Winter Weather Advisory | OAX | 21 hr |
| Apr 22, 11:13 AM CDT | Winter Weather Advisory | OAX | 6 hr |
| May 2, 3:42 AM CDT | Freeze Watch | OAX | 12 hr |
| May 2, 3:46 PM CDT | Freeze Warning | OAX | 17 hr |
| May 6, 3:40 AM CDT | Dense Fog Advisory | OAX | 6 hr |
| May 8, 3:44 PM CDT | Special Weather Statement | OAX | 91 min |
| May 8, 4:02 PM CDT | Special Weather Statement | OAX | 28 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, 1:06 PM CDT | Special Weather Statement | OAX | 39 min |
| May 16, 1:25 PM CDT | Mesoscale Discussion | SPC | 95 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 18, 10:38 PM CDT | Special Weather Statement | OAX | 52 min |
| May 19, 4:50 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| May 19, 6:53 PM CDT | Special Weather Statement | OAX | 37 min |
| May 25, 10:24 PM CDT | Severe Thunderstorm Warning | OAX | 36 min |
| May 25, 10:59 PM CDT | Mesoscale Discussion | SPC | 91 min |
| May 26, 9:07 PM CDT | Mesoscale Discussion | SPC | 83 min |
| May 26, 9:23 PM CDT | Severe Thunderstorm Warning | OAX | 52 min |
| May 26, 10:04 PM CDT | Flash Flood Warning | OAX | 3 hr |
| May 26, 10:12 PM CDT | Severe Thunderstorm Warning | OAX | 33 min |
| May 26, 11:03 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 26, 11:58 PM CDT | Severe Thunderstorm Warning | OAX | 32 min |
| May 27, 11:44 PM CDT | Special Weather Statement | OAX | 46 min |
| May 28, 12:27 AM CDT | Special Weather Statement | OAX | 48 min |
| May 29, 8:54 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 29, 6:19 PM CDT | Special Weather Statement | OAX | 41 min |
| May 29, 6:24 PM CDT | Tornado Watch | SPC | 4 hr |
| May 29, 6:52 PM CDT | Severe Thunderstorm Warning | OAX | 23 min |
| May 31, 3:38 AM CDT | Wind Advisory | OAX | 15 hr |
| Jun 11, 11:12 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 12, 12:06 AM CDT | Special Weather Statement | OAX | 39 min |
| Jun 14, 3:37 PM CDT | Tornado Watch | SPC | 6 hr |
| Jun 15, 6:43 AM CDT | Special Weather Statement | OAX | 47 min |
| Jun 15, 7:39 AM CDT | Severe Thunderstorm Warning | OAX | 36 min |
| Jun 15, 7:40 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 15, 8:06 AM CDT | Severe Thunderstorm Warning | OAX | 24 min |
| Jun 21, 9:06 PM CDT | Severe Thunderstorm Warning | OAX | 24 min |
| Jun 21, 9:07 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jun 22, 5:56 PM CDT | Tornado Watch | SPC | 7 hr |
| Jun 22, 8:27 PM CDT | Mesoscale Discussion | SPC | 63 min |
| Jun 22, 11:48 PM CDT | Mesoscale Discussion | SPC | 87 min |
| Jun 23, 12:46 AM CDT | Special Weather Statement | OAX | 29 min |
| Jun 23, 1:22 AM CDT | Special Weather Statement | OAX | 23 min |
| Jun 27, 4:15 AM CDT | Special Weather Statement | OAX | 30 min |
| Jun 27, 4:28 AM CDT | Mesoscale Discussion | SPC | 62 min |
| Jun 27, 7:40 AM CDT | Special Weather Statement | OAX | 35 min |
| Jul 7, 5:35 PM CDT | Mesoscale Discussion | SPC | 115 min |
| Jul 7, 6:03 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 7, 7:42 PM CDT | Special Weather Statement | OAX | 33 min |
| Jul 7, 7:52 PM CDT | Severe Thunderstorm Warning | OAX | 38 min |
| Jul 8, 10:03 PM CDT | Mesoscale Discussion | SPC | 57 min |
| Jul 13, 11:29 PM CDT | Mesoscale Discussion | SPC | 61 min |
| Jul 14, 1:59 AM CDT | Special Weather Statement | OAX | 61 min |
| Jul 25, 12:41 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 25, 3:59 PM CDT | Special Weather Statement | OAX | 46 min |
| Jul 25, 4:20 PM CDT | Severe Thunderstorm Warning | OAX | 55 min |
| Aug 1, 8:16 AM CDT | Mesoscale Discussion | SPC | 59 min |
| Aug 1, 1:45 PM CDT | Special Weather Statement | OAX | 45 min |
| Aug 1, 1:51 PM CDT | Severe Thunderstorm Warning | OAX | 24 min |
| Aug 1, 2:08 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Aug 1, 2:15 PM CDT | Special Weather Statement | OAX | 30 min |
| Aug 1, 2:30 PM CDT | Severe Thunderstorm Warning | OAX | 45 min |
| Aug 1, 2:59 PM CDT | Special Weather Statement | OAX | 31 min |
| Aug 1, 3:25 PM CDT | Mesoscale Discussion | SPC | 95 min |
| Aug 6, 5:07 AM CDT | Mesoscale Discussion | SPC | 83 min |
| Aug 10, 3:18 PM CDT | Special Weather Statement | OAX | 27 min |
| Aug 10, 3:49 PM CDT | Special Weather Statement | OAX | 26 min |
| Aug 10, 4:12 PM CDT | Special Weather Statement | OAX | 48 min |
| Aug 10, 4:53 PM CDT | Severe Thunderstorm Warning | OAX | 37 min |
| Aug 10, 5:14 PM CDT | Areal Flood Advisory | OAX | 3 hr |
| Aug 10, 5:27 PM CDT | Special Weather Statement | OAX | 33 min |
| Aug 10, 5:31 PM CDT | Special Weather Statement | OAX | 44 min |
| Aug 21, 8:59 PM CDT | Special Weather Statement | OAX | 31 min |
| Aug 21, 9:16 PM CDT | Special Weather Statement | OAX | 29 min |
| Aug 21, 9:16 PM CDT | Mesoscale Discussion | SPC | 59 min |
| Aug 21, 9:24 PM CDT | Severe Thunderstorm Warning | OAX | 51 min |
| Aug 21, 9:38 PM CDT | Special Weather Statement | OAX | 37 min |
| Aug 21, 10:12 PM CDT | Special Weather Statement | OAX | 33 min |
| Aug 21, 10:16 PM CDT | Areal Flood Advisory | OAX | 3 hr |
| Aug 25, 3:27 AM CDT | Heat Advisory | OAX | 64 hr |
| Aug 31, 3:01 PM CDT | Mesoscale Discussion | SPC | 119 min |
| Sep 1, 1:10 AM CDT | Mesoscale Discussion | SPC | 95 min |
| Oct 2, 2:59 PM CDT | Mesoscale Discussion | SPC | 61 min |
| Oct 2, 4:20 PM CDT | Severe Thunderstorm Warning | OAX | 25 min |
| Oct 2, 4:44 PM CDT | Severe Thunderstorm Warning | OAX | 31 min |
| Oct 2, 5:43 PM CDT | Special Weather Statement | OAX | 32 min |
| Oct 2, 6:08 PM CDT | Special Weather Statement | OAX | 37 min |
| Oct 4, 2:38 PM CDT | Tornado Watch | SPC | 7 hr |
| Oct 4, 5:11 PM CDT | Severe Thunderstorm Warning | OAX | 49 min |
| Oct 4, 5:20 PM CDT | Mesoscale Discussion | SPC | 85 min |
| Oct 4, 5:22 PM CDT | Tornado Warning | OAX | 38 min |
| Oct 4, 5:37 PM CDT | Tornado Warning | OAX | 23 min |
| Oct 10, 3:19 PM CDT | Wind Advisory | OAX | 26 hr |
| Oct 12, 3:20 PM CDT | Frost Advisory | OAX | 17 hr |
| Nov 4, 3:32 PM CST | Winter Weather Advisory | OAX | 29 hr |
| Dec 4, 3:51 PM CST | Wind Chill Advisory | OAX | 19 hr |
| Dec 5, 3:33 PM CST | Wind Chill Advisory | OAX | 20 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 11, 3:19 AM CST | Wind Chill Advisory | OAX | 6 hr |
| Dec 22, 3:40 AM CST | Wind Chill Advisory | OAX | 32 hr |
| Dec 28, 3:27 PM CST | Wind Advisory | OAX | 15 hr |
| Dec 28, 3:29 PM CST | Wind Chill Advisory | OAX | 20 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 | 17 |
| Tornado Warning | 2 |
| Severe Thunderstorm Watch | 6 |
| Tornado Watch | 4 |
| Mesoscale Discussion | 22 |
| Special Weather Statement | 32 |
| Flooding | |
| Flash Flood Warning | 1 |
| Areal Flood Advisory | 2 |
| Winter | |
| Winter Storm Warning | 2 |
| Winter Storm Watch | 3 |
| Winter Weather Advisory | 8 |
| Heat | |
| Heat Advisory | 1 |
| Cold | |
| Freeze Warning | 1 |
| Freeze Watch | 1 |
| Frost Advisory | 2 |
| Wind Chill Advisory | 8 |
| Wind and dust | |
| Wind Advisory | 10 |
| Fire | |
| Red Flag Warning | 1 |
| Fire Weather Watch | 1 |
| Fog and smoke | |
| Dense Fog Advisory | 3 |
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.