Alert archive / Nebraska / Knox County
Weather alerts in Knox County, Nebraska, 2023
146 weather alerts in 2023, 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 2023. Tap one for its archive.
- Alerts
- 146
- Warnings
- 54
- Watches
- 18
- Advisories
- 36
- Busiest month
- July35 alerts
- Busiest day
- June 24, 202316 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
0 of 1 tornado warnings covering Knox County in 2023 had a tornado report inside them.
Knox County, 2023
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 1 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 34 | 16 | 53% | 20 | 100% | 24 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2023
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Omaha, NE: tornado warnings | 47 | 22 | 53% | 74 | 78% | 26 min |
| NWS Omaha, NE: severe thunderstorm warnings | 371 | 147 | 60% | 513 | 81% | 23 min |
| NWS Omaha, NE: flash flood warnings | 16 | 7 | 56% | 17 | 59% | 57 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, 2:37 PM CST | Winter Storm Warning | OAX | 45 hr |
| Jan 1, 2:37 PM CST | Winter Weather Advisory | OAX | 51 hr |
| Jan 2, 1:28 PM CST | Mesoscale Discussion | SPC | 5 hr |
| Jan 3, 12:06 AM CST | Mesoscale Discussion | SPC | 6 hr |
| Jan 3, 6:09 AM CST | Mesoscale Discussion | SPC | 6 hr |
| Jan 13, 2:06 AM CST | Dense Fog Advisory | OAX | 8 hr |
| Jan 16, 2:29 AM CST | Winter Storm Watch | OAX | 36 hr |
| Jan 17, 7:35 AM CST | Winter Storm Warning | OAX | 46 hr |
| Jan 26, 3:13 AM CST | Winter Storm Watch | OAX | 24 hr |
| Jan 27, 3:11 AM CST | Winter Storm Warning | OAX | 39 hr |
| Jan 27, 9:51 PM CST | Mesoscale Discussion | SPC | 6 hr |
| Jan 28, 3:20 AM CST | Wind Chill Advisory | OAX | 31 hr |
| Jan 29, 2:09 PM CST | Wind Chill Advisory | OAX | 19 hr |
| Jan 30, 2:07 PM CST | Wind Chill Advisory | OAX | 19 hr |
| Feb 9, 2:48 AM CST | Wind Advisory | OAX | 15 hr |
| Feb 14, 3:45 AM CST | Wind Advisory | OAX | 26 hr |
| Feb 14, 3:50 AM CST | Winter Weather Advisory | OAX | 23 hr |
| Feb 19, 2:13 PM CST | Winter Storm Watch | OAX | 37 hr |
| Feb 21, 3:30 AM CST | Winter Storm Warning | OAX | 48 hr |
| Feb 21, 3:30 AM CST | Winter Weather Advisory | OAX | 58 hr |
| Feb 21, 2:11 PM CST | Wind Chill Advisory | OAX | 46 hr |
| Feb 23, 2:40 PM CST | Wind Chill Advisory | OAX | 18 hr |
| Mar 6, 1:13 AM CST | Dense Fog Advisory | OAX | 7 hr |
| Mar 8, 3:53 AM CST | Winter Weather Advisory | OAX | 38 hr |
| Mar 11, 4:06 AM CST | Winter Weather Advisory | OAX | 11 hr |
| Mar 15, 3:41 AM CDT | Winter Storm Watch | OAX | 11 hr |
| Mar 15, 3:04 PM CDT | Winter Storm Warning | OAX | 23 hr |
| Mar 16, 3:20 AM CDT | Wind Advisory | OAX | 19 hr |
| Mar 23, 12:27 AM CDT | Winter Weather Advisory | OAX | 6 hr |
| Mar 30, 9:15 PM CDT | Special Weather Statement | OAX | 15 min |
| Mar 30, 9:20 PM CDT | Severe Thunderstorm Warning | OAX | 40 min |
| Mar 30, 10:30 PM CDT | Severe Thunderstorm Warning | OAX | 45 min |
| Mar 30, 11:29 PM CDT | Severe Thunderstorm Warning | OAX | 30 min |
| Mar 31, 3:55 AM CDT | Wind Advisory | OAX | 27 hr |
| Mar 31, 10:27 AM CDT | Winter Weather Advisory | OAX | 18 hr |
| Apr 7, 2:31 PM CDT | Red Flag Warning | OAX | 29 hr |
| Apr 10, 3:08 AM CDT | Fire Weather Watch | OAX | 9 hr |
| Apr 10, 11:45 AM CDT | Red Flag Warning | OAX | 33 hr |
| Apr 11, 3:03 PM CDT | Red Flag Warning | OAX | 29 hr |
| Apr 12, 2:25 AM CDT | Fire Weather Watch | OAX | 12 hr |
| Apr 12, 2:26 PM CDT | Red Flag Warning | OAX | 30 hr |
| Apr 15, 2:39 PM CDT | Red Flag Warning | OAX | 29 hr |
| Apr 15, 2:40 PM CDT | Wind Advisory | OAX | 28 hr |
| Apr 19, 1:54 AM CDT | Severe Thunderstorm Warning | OAX | 36 min |
| Apr 21, 3:23 AM CDT | Freeze Watch | OAX | 24 hr |
| Apr 21, 3:23 AM CDT | Freeze Warning | OAX | 30 hr |
| Apr 22, 2:56 AM CDT | Freeze Warning | OAX | 30 hr |
| Apr 23, 11:46 AM CDT | Freeze Warning | OAX | 21 hr |
| Apr 28, 3:16 AM CDT | Frost Advisory | OAX | 29 hr |
| Apr 30, 5:10 PM CDT | Freeze Warning | OAX | 15 hr |
| May 1, 2:32 PM CDT | Freeze Warning | OAX | 17 hr |
| May 6, 5:32 PM CDT | Mesoscale Discussion | SPC | 88 min |
| May 8, 3:51 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 11, 1:36 AM CDT | Special Weather Statement | OAX | 24 min |
| May 11, 2:23 AM CDT | Special Weather Statement | OAX | 37 min |
| May 11, 4:12 PM CDT | Severe Thunderstorm Warning | OAX | 33 min |
| May 12, 12:17 PM CDT | Mesoscale Discussion | SPC | 118 min |
| May 12, 1:09 PM CDT | Tornado Watch | SPC | 8 hr |
| May 12, 3:23 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 12, 6:09 PM CDT | Tornado Warning | OAX | 36 min |
| May 12, 7:02 PM CDT | Severe Thunderstorm Warning | OAX | 43 min |
| May 29, 6:32 PM CDT | Severe Thunderstorm Warning | OAX | 29 min |
| Jun 16, 2:57 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 16, 7:22 PM CDT | Special Weather Statement | OAX | 23 min |
| Jun 23, 5:42 PM CDT | Severe Thunderstorm Warning | OAX | 48 min |
| Jun 23, 6:25 PM CDT | Severe Thunderstorm Warning | OAX | 50 min |
| Jun 23, 10:19 PM CDT | Mesoscale Discussion | SPC | 56 min |
| Jun 23, 10:37 PM CDT | Severe Thunderstorm Warning | OAX | 38 min |
| Jun 23, 10:38 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 23, 11:14 PM CDT | Severe Thunderstorm Warning | OAX | 31 min |
| Jun 24, 12:04 AM CDT | Severe Thunderstorm Warning | OAX | 26 min |
| Jun 24, 12:27 AM CDT | Severe Thunderstorm Warning | OAX | 13 min |
| Jun 24, 12:32 AM CDT | Severe Thunderstorm Warning | OAX | 11 min |
| Jun 24, 1:51 AM CDT | Mesoscale Discussion | SPC | 84 min |
| Jun 24, 2:43 AM CDT | Special Weather Statement | OAX | 32 min |
| Jun 24, 2:52 AM CDT | Severe Thunderstorm Warning | OAX | 53 min |
| Jun 24, 3:28 AM CDT | Severe Thunderstorm Warning | OAX | 47 min |
| Jun 24, 3:01 PM CDT | Mesoscale Discussion | SPC | 119 min |
| Jun 24, 4:20 PM CDT | Severe Thunderstorm Warning | OAX | 25 min |
| Jun 24, 4:26 PM CDT | River Flood Warning | OAX | 21 hr |
| Jun 24, 4:41 PM CDT | Severe Thunderstorm Warning | OAX | 49 min |
| Jun 24, 5:26 PM CDT | Severe Thunderstorm Warning | OAX | 49 min |
| Jun 27, 7:26 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 3, 3:48 PM CDT | Mesoscale Discussion | SPC | 117 min |
| Jul 8, 3:26 AM CDT | Dense Fog Advisory | OAX | 6 hr |
| Jul 10, 2:09 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 10, 3:09 PM CDT | Severe Thunderstorm Warning | OAX | 51 min |
| Jul 10, 3:12 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 10, 3:15 PM CDT | Severe Thunderstorm Warning | OAX | 45 min |
| Jul 10, 3:53 PM CDT | Severe Thunderstorm Warning | OAX | 52 min |
| Jul 10, 3:56 PM CDT | Severe Thunderstorm Warning | OAX | 49 min |
| Jul 10, 4:35 PM CDT | Severe Thunderstorm Warning | OAX | 40 min |
| Jul 10, 4:39 PM CDT | Severe Thunderstorm Warning | OAX | 51 min |
| Jul 10, 5:07 PM CDT | Severe Thunderstorm Warning | OAX | 38 min |
| Jul 10, 5:59 PM CDT | Mesoscale Discussion | SPC | 61 min |
| Jul 11, 11:34 PM CDT | Mesoscale Discussion | SPC | 56 min |
| Jul 12, 12:10 AM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 12, 2:39 AM CDT | Mesoscale Discussion | SPC | 96 min |
| Jul 12, 3:44 AM CDT | Severe Thunderstorm Warning | OAX | 46 min |
| Jul 12, 4:20 AM CDT | Severe Thunderstorm Warning | OAX | 55 min |
| Jul 12, 4:41 AM CDT | Mesoscale Discussion | SPC | 94 min |
| Jul 18, 8:43 PM CDT | Mesoscale Discussion | SPC | 62 min |
| Jul 18, 10:05 PM CDT | Severe Thunderstorm Watch | SPC | 3 hr |
| Jul 18, 11:27 PM CDT | Mesoscale Discussion | SPC | 93 min |
| Jul 19, 3:56 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 19, 6:55 PM CDT | Severe Thunderstorm Warning | OAX | 31 min |
| Jul 22, 3:58 PM CDT | Severe Thunderstorm Warning | OAX | 32 min |
| Jul 24, 1:28 AM CDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 24, 1:54 AM CDT | Severe Thunderstorm Warning | OAX | 51 min |
| Jul 24, 1:56 AM CDT | Severe Thunderstorm Warning | OAX | 49 min |
| Jul 24, 2:08 AM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 24, 2:18 AM CDT | Severe Thunderstorm Warning | OAX | 42 min |
| Jul 24, 2:34 AM CDT | Severe Thunderstorm Warning | OAX | 41 min |
| Jul 24, 3:03 AM CDT | Heat Advisory | OAX | 5 days |
| Jul 25, 7:34 PM CDT | Mesoscale Discussion | SPC | 86 min |
| Jul 26, 2:19 PM CDT | Heat Advisory | OAX | 8 hr |
| Jul 29, 3:20 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 30, 3:26 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 3, 1:25 AM CDT | Dense Fog Advisory | OAX | 7 hr |
| Aug 5, 2:10 PM CDT | Mesoscale Discussion | SPC | 95 min |
| Aug 5, 3:01 PM CDT | Tornado Watch | SPC | 7 hr |
| Aug 6, 3:13 PM CDT | Special Weather Statement | OAX | 32 min |
| Aug 17, 1:28 PM CDT | Excessive Heat Watch | OAX | 26 hr |
| Aug 18, 3:16 PM CDT | Excessive Heat Warning | OAX | 7 days |
| Aug 18, 3:16 PM CDT | Heat Advisory | OAX | 30 hr |
| Aug 19, 2:36 AM CDT | Heat Advisory | OAX | 57 hr |
| Aug 22, 2:51 AM CDT | Heat Advisory | OAX | 11 hr |
| Sep 1, 2:17 PM CDT | Heat Advisory | OAX | 53 hr |
| Sep 27, 6:05 AM CDT | Dense Fog Advisory | OAX | 5 hr |
| Sep 29, 7:27 AM CDT | Special Weather Statement | OAX | 33 min |
| Oct 3, 4:45 PM CDT | Mesoscale Discussion | SPC | 90 min |
| Oct 3, 5:03 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Oct 3, 6:56 PM CDT | Mesoscale Discussion | SPC | 94 min |
| Oct 5, 4:31 AM CDT | Freeze Watch | OAX | 22 hr |
| Oct 5, 3:07 PM CDT | Wind Advisory | OAX | 22 hr |
| Oct 6, 2:05 AM CDT | Freeze Warning | OAX | 31 hr |
| Oct 11, 8:50 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Oct 13, 1:15 AM CDT | Areal Flood Advisory | OAX | 4 hr |
| Oct 15, 2:05 PM CDT | Frost Advisory | OAX | 19 hr |
| Oct 27, 3:01 PM CDT | Winter Weather Advisory | OAX | 40 hr |
| Dec 8, 2:58 PM CST | Wind Advisory | OAX | 27 hr |
| Dec 23, 3:32 PM CST | Winter Storm Watch | OAX | 22 hr |
| Dec 24, 2:23 AM CST | Blizzard Warning | OAX | 40 hr |
| Dec 24, 2:01 PM CST | Winter Weather Advisory | OAX | 37 hr |
| Dec 25, 7:00 AM CST | Mesoscale Discussion | SPC | 6 hr |
| Dec 28, 4:09 AM CST | Dense Fog Advisory | OAX | 6 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 archive20222024
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.