Alert archive / Nebraska / Nemaha County
Weather alerts in Nemaha County, Nebraska, 2019
174 weather alerts in 2019, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Nemaha County and its neighbors
Each county as a circle sized by its count in 2019. Tap one for its archive.
- Alerts
- 174
- Warnings
- 49
- Watches
- 37
- Advisories
- 40
- Busiest month
- May44 alerts
- Busiest day
- May 24, 201911 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 6 tornado warnings covering Nemaha County in 2019 had a tornado report inside them.
Nemaha County, 2019
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 6 | 2 | 67% | 0 | ||
| Severe thunderstorm warnings | 16 | 6 | 63% | 5 | 80% | 23 min |
| Flash flood warnings | 6 | 1 | 83% | 2 | 100% | 17 min |
Each office's whole area, 2019
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Omaha, NE: tornado warnings | 23 | 7 | 70% | 9 | 78% | 18 min |
| NWS Omaha, NE: severe thunderstorm warnings | 191 | 82 | 57% | 179 | 74% | 17 min |
| NWS Omaha, NE: flash flood warnings | 47 | 10 | 79% | 27 | 81% | 284 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, 3:32 PM CST | Winter Weather Advisory | OAX | 48 hr |
| Jan 12, 7:25 AM CST | Winter Storm Warning | OAX | 9 hr |
| Jan 14, 9:13 PM CST | Dense Fog Advisory | OAX | 12 hr |
| Jan 17, 3:38 AM CST | Winter Weather Advisory | OAX | 48 hr |
| Jan 17, 2:49 PM CST | Winter Storm Warning | OAX | 31 hr |
| Jan 21, 3:47 AM CST | Winter Weather Advisory | OAX | 50 hr |
| Jan 23, 3:01 PM CST | Winter Weather Advisory | OAX | 27 hr |
| Jan 23, 3:32 PM CST | Wind Chill Advisory | OAX | 41 hr |
| Jan 27, 3:04 AM CST | High Wind Warning | OAX | 31 hr |
| Jan 27, 3:55 AM CST | Wind Advisory | OAX | 38 hr |
| Jan 28, 12:43 AM CST | Wind Advisory | OAX | 17 hr |
| Jan 28, 2:38 AM CST | Wind Chill Warning | OAX | 57 hr |
| Jan 28, 2:38 AM CST | Wind Chill Advisory | OAX | 3 days |
| Jan 29, 3:19 AM CST | Wind Chill Advisory | OAX | 54 hr |
| Feb 2, 9:08 AM CST | Dense Fog Advisory | OAX | 3 hr |
| Feb 2, 12:14 PM CST | Dense Fog Advisory | OAX | 25 hr |
| Feb 5, 3:31 PM CST | Winter Weather Advisory | OAX | 50 hr |
| Feb 6, 11:29 PM CST | Special Weather Statement | OAX | 31 min |
| Feb 7, 3:29 AM CST | Wind Chill Advisory | OAX | 33 hr |
| Feb 10, 2:55 AM CST | Winter Weather Advisory | OAX | 9 hr |
| Feb 10, 3:56 AM CST | Winter Weather Advisory | OAX | 44 hr |
| Feb 14, 2:47 AM CST | Winter Weather Advisory | OAX | 25 hr |
| Feb 15, 4:09 AM CST | Winter Weather Advisory | OAX | 14 hr |
| Feb 15, 3:35 PM CST | Winter Weather Advisory | OAX | 50 hr |
| Feb 16, 7:26 PM CST | Mesoscale Discussion | SPC | 5 hr |
| Feb 18, 3:50 AM CST | Winter Storm Watch | OAX | 24 hr |
| Feb 19, 3:40 AM CST | Winter Storm Warning | OAX | 32 hr |
| Feb 21, 4:18 AM CST | Winter Weather Advisory | OAX | 71 hr |
| Feb 21, 4:13 PM CST | Winter Storm Watch | OAX | 22 hr |
| Feb 22, 1:46 PM CST | Blizzard Warning | OAX | 37 hr |
| Mar 2, 3:22 AM CST | Wind Chill Advisory | OAX | 57 hr |
| Mar 7, 12:09 AM CST | Mesoscale Discussion | SPC | 3 hr |
| Mar 9, 3:27 AM CST | Wind Advisory | OAX | 21 hr |
| Mar 11, 3:31 AM CDT | Flood Watch | OAX | 3 days |
| Mar 12, 10:46 AM CDT | River Flood Warning | OAX | 273 days |
| Mar 12, 11:25 AM CDT | River Flood Warning | OAX | 68 hr |
| Mar 12, 1:48 PM CDT | Areal Flood Advisory | OAX | 6 hr |
| Mar 13, 9:41 AM CDT | Areal Flood Warning | OAX | 3 hr |
| Mar 13, 1:25 PM CDT | Wind Advisory | OAX | 3 hr |
| Mar 13, 1:26 PM CDT | Areal Flood Warning | OAX | 6 hr |
| Mar 13, 4:02 PM CDT | Wind Advisory | OAX | 33 hr |
| Mar 13, 6:29 PM CDT | Areal Flood Warning | OAX | 39 hr |
| Mar 15, 9:45 AM CDT | Areal Flood Warning | OAX | 24 hr |
| Mar 16, 11:23 AM CDT | Areal Flood Warning | OAX | 48 hr |
| Mar 16, 4:58 PM CDT | Flash Flood Warning | OAX | 12 hr |
| Mar 18, 11:01 AM CDT | Areal Flood Warning | OAX | 24 hr |
| Mar 19, 10:54 AM CDT | Areal Flood Warning | OAX | 12 hr |
| Mar 28, 9:55 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 5, 1:05 AM CDT | Dense Fog Advisory | OAX | 9 hr |
| Apr 10, 5:49 PM CDT | Mesoscale Discussion | SPC | 116 min |
| Apr 10, 6:39 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Apr 10, 10:08 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 26, 4:28 PM CDT | Wind Advisory | OAX | 24 hr |
| Apr 27, 3:24 AM CDT | Frost Advisory | OAX | 24 hr |
| May 5, 3:39 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 5, 5:01 PM CDT | Mesoscale Discussion | SPC | 89 min |
| May 5, 6:33 PM CDT | Mesoscale Discussion | SPC | 87 min |
| May 5, 6:50 PM CDT | Severe Thunderstorm Warning | OAX | 25 min |
| May 7, 3:46 AM CDT | Flash Flood Watch | OAX | 35 hr |
| May 8, 12:53 PM CDT | River Flood Warning | OAX | 13 hr |
| May 17, 11:45 PM CDT | Severe Thunderstorm Watch | SPC | 3 hr |
| May 19, 4:20 AM CDT | Flash Flood Watch | OAX | 63 hr |
| May 21, 10:57 AM CDT | Special Weather Statement | OAX | 78 min |
| May 21, 6:53 PM CDT | Severe Thunderstorm Watch | SPC | 3 hr |
| May 21, 7:39 PM CDT | Tornado Warning | OAX | 36 min |
| May 21, 8:00 PM CDT | Tornado Warning | OAX | 30 min |
| May 21, 8:46 PM CDT | Mesoscale Discussion | SPC | 59 min |
| May 23, 4:17 PM CDT | Flash Flood Watch | OAX | 29 hr |
| May 23, 7:42 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| May 23, 11:33 PM CDT | Mesoscale Discussion | SPC | 87 min |
| May 24, 1:37 AM CDT | Tornado Watch | SPC | 5 hr |
| May 24, 3:56 AM CDT | Special Weather Statement | OAX | 49 min |
| May 24, 4:05 AM CDT | Mesoscale Discussion | SPC | 115 min |
| May 24, 4:11 AM CDT | Tornado Warning | OAX | 34 min |
| May 24, 4:21 AM CDT | Severe Thunderstorm Warning | OAX | 39 min |
| May 24, 4:36 AM CDT | Tornado Warning | OAX | 24 min |
| May 24, 4:40 AM CDT | Tornado Warning | OAX | 22 min |
| May 24, 5:27 AM CDT | Flash Flood Warning | OAX | 6 hr |
| May 24, 6:00 AM CDT | River Flood Warning | OAX | 34 hr |
| May 25, 3:28 AM CDT | Flash Flood Watch | OAX | 24 hr |
| May 25, 4:44 PM CDT | Special Weather Statement | OAX | 31 min |
| May 26, 1:17 PM CDT | Flash Flood Watch | OAX | 25 hr |
| May 27, 1:54 AM CDT | Mesoscale Discussion | SPC | 111 min |
| May 27, 2:41 AM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| May 27, 10:55 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 27, 11:18 PM CDT | Severe Thunderstorm Warning | OAX | 42 min |
| May 27, 11:42 PM CDT | Mesoscale Discussion | SPC | 63 min |
| May 28, 1:22 AM CDT | Severe Thunderstorm Warning | OAX | 38 min |
| May 28, 3:18 AM CDT | Flash Flood Watch | OAX | 24 hr |
| May 28, 4:58 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 28, 9:01 AM CDT | River Flood Warning | OAX | 50 hr |
| May 28, 2:55 PM CDT | Mesoscale Discussion | SPC | 95 min |
| May 28, 3:13 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 28, 4:21 PM CDT | Flash Flood Warning | OAX | 4 hr |
| May 28, 7:57 PM CDT | Severe Thunderstorm Warning | OAX | 31 min |
| May 28, 8:15 PM CDT | Areal Flood Warning | OAX | 39 min |
| May 28, 8:51 PM CDT | Flash Flood Warning | OAX | 6 hr |
| May 28, 9:52 PM CDT | Mesoscale Discussion | SPC | 53 min |
| Jun 4, 5:32 AM CDT | Flash Flood Warning | OAX | 3 hr |
| Jun 9, 1:02 AM CDT | Special Weather Statement | OAX | 28 min |
| Jun 14, 11:24 PM CDT | Mesoscale Discussion | SPC | 96 min |
| Jun 18, 4:18 AM CDT | Flood Watch | OAX | 16 hr |
| Jun 21, 2:07 AM CDT | Mesoscale Discussion | SPC | 83 min |
| Jun 21, 2:39 AM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 21, 4:34 AM CDT | Mesoscale Discussion | SPC | 86 min |
| Jun 21, 7:20 AM CDT | Severe Thunderstorm Warning | OAX | 25 min |
| Jun 21, 7:26 AM CDT | Mesoscale Discussion | SPC | 94 min |
| Jun 21, 7:41 AM CDT | Severe Thunderstorm Warning | OAX | 34 min |
| Jun 21, 7:56 AM CDT | Areal Flood Advisory | OAX | 2 hr |
| Jun 21, 8:10 AM CDT | Severe Thunderstorm Warning | OAX | 23 min |
| Jun 21, 6:24 PM CDT | Mesoscale Discussion | SPC | 66 min |
| Jun 22, 5:18 AM CDT | Mesoscale Discussion | SPC | 87 min |
| Jun 22, 5:38 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jun 25, 1:58 PM CDT | Mesoscale Discussion | SPC | 92 min |
| Jun 25, 3:08 PM CDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jun 25, 5:59 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 25, 6:15 PM CDT | Severe Thunderstorm Warning | OAX | 30 min |
| Jun 25, 6:20 PM CDT | Severe Thunderstorm Warning | OAX | 25 min |
| Jun 25, 6:46 PM CDT | Severe Thunderstorm Warning | OAX | 14 min |
| Jun 25, 7:01 PM CDT | Severe Thunderstorm Warning | OAX | 14 min |
| Jun 26, 2:26 AM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 26, 6:34 AM CDT | Mesoscale Discussion | SPC | 116 min |
| Jun 28, 3:00 AM CDT | Severe Thunderstorm Warning | OAX | 31 min |
| Jun 28, 3:01 PM CDT | Heat Advisory | OAX | 30 hr |
| Jun 29, 2:55 AM CDT | Heat Advisory | OAX | 41 hr |
| Jul 5, 4:54 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 9, 4:36 AM CDT | Special Weather Statement | OAX | 54 min |
| Jul 15, 3:48 PM CDT | Excessive Heat Watch | OAX | 5 hr |
| Jul 15, 3:48 PM CDT | Excessive Heat Watch | OAX | 5 hr |
| Jul 15, 3:48 PM CDT | Excessive Heat Watch | OAX | 36 hr |
| Jul 16, 3:56 PM CDT | Excessive Heat Warning | OAX | 4 days |
| Jul 20, 11:01 PM CDT | Mesoscale Discussion | SPC | 119 min |
| Jul 21, 3:12 AM CDT | Areal Flood Advisory | OAX | 3 hr |
| Jul 31, 3:15 PM CDT | Flash Flood Watch | OAX | 20 hr |
| Aug 7, 3:49 AM CDT | Special Weather Statement | OAX | 56 min |
| Aug 8, 7:57 PM CDT | Special Weather Statement | OAX | 48 min |
| Aug 11, 9:40 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 12, 1:15 AM CDT | Mesoscale Discussion | SPC | 90 min |
| Aug 12, 3:03 AM CDT | Special Weather Statement | OAX | 57 min |
| Aug 15, 11:11 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 15, 12:38 PM CDT | Special Weather Statement | OAX | 37 min |
| Aug 16, 12:54 PM CDT | Flash Flood Watch | OAX | 18 hr |
| Aug 17, 3:33 AM CDT | Severe Thunderstorm Warning | OAX | 27 min |
| Aug 20, 10:18 AM CDT | Heat Advisory | OAX | 11 hr |
| Aug 21, 1:42 AM CDT | Special Weather Statement | OAX | 33 min |
| Aug 21, 2:33 AM CDT | Flash Flood Warning | OAX | 6 hr |
| Sep 20, 4:01 PM CDT | Flash Flood Watch | OAX | 42 hr |
| Sep 21, 5:07 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Sep 21, 7:25 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 21, 7:54 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 21, 10:32 PM CDT | Mesoscale Discussion | SPC | 118 min |
| Sep 24, 5:30 PM CDT | Mesoscale Discussion | SPC | 60 min |
| Sep 24, 5:42 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Sep 29, 4:54 AM CDT | Flash Flood Watch | OAX | 7 hr |
| Sep 30, 3:58 AM CDT | Flash Flood Watch | OAX | 41 hr |
| Oct 1, 2:08 PM CDT | Mesoscale Discussion | SPC | 67 min |
| Oct 1, 2:32 PM CDT | Tornado Warning | OAX | 32 min |
| Oct 1, 2:45 PM CDT | Tornado Watch | SPC | 7 hr |
| Oct 1, 4:37 PM CDT | Special Weather Statement | OAX | 23 min |
| Oct 1, 4:40 PM CDT | Severe Thunderstorm Warning | OAX | 24 min |
| Oct 1, 5:22 PM CDT | Severe Thunderstorm Warning | OAX | 38 min |
| Oct 1, 8:35 PM CDT | Flood Watch | OAX | 9 hr |
| Oct 10, 3:37 AM CDT | Freeze Watch | OAX | 25 hr |
| Oct 11, 4:12 AM CDT | Freeze Warning | OAX | 30 hr |
| Oct 18, 3:47 AM CDT | Wind Advisory | OAX | 14 hr |
| Oct 20, 5:30 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Oct 20, 9:11 PM CDT | Special Weather Statement | OAX | 34 min |
| Oct 29, 3:37 AM CDT | Winter Weather Advisory | OAX | 42 hr |
| Nov 26, 4:00 AM CST | Wind Advisory | OAX | 29 hr |
| Nov 27, 4:07 PM CST | Winter Weather Advisory | OAX | 47 hr |
| Nov 30, 3:20 AM CST | Wind Advisory | OAX | 33 hr |
| Dec 9, 8:43 AM CST | Special Weather Statement | OAX | 92 min |
| Dec 14, 3:26 AM CST | Winter Weather Advisory | OAX | 38 hr |
| Dec 16, 11:29 PM CST | Dense Fog Advisory | OAX | 10 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 archive20182020
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.