Alert archive / Nebraska / Jefferson County
Weather alerts in Jefferson County, Nebraska, 2009
128 weather alerts in 2009, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Jefferson County and its neighbors
Each county as a circle sized by its count in 2009. Tap one for its archive.
- Alerts
- 128
- Warnings
- 27
- Watches
- 28
- Advisories
- 29
- Busiest month
- June44 alerts
- Busiest day
- April 26, 20098 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Jefferson County, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 18 | 15 | 17% | 28 | 96% | 21 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Omaha, NE: tornado warnings | 17 | 5 | 71% | 7 | 100% | 16 min |
| NWS Omaha, NE: severe thunderstorm warnings | 216 | 129 | 40% | 280 | 85% | 21 min |
| NWS Omaha, NE: flash flood warnings | 7 | 2 | 71% | 5 | 80% | 137 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 3, 10:23 AM CST | Freezing Rain Advisory | OAX | 10 hr |
| Jan 11, 2:49 PM CST | Wind Advisory | OAX | 13 hr |
| Jan 12, 2:56 AM CST | Winter Weather Advisory | OAX | 7 hr |
| Jan 12, 9:31 AM CST | Wind Advisory | OAX | 11 hr |
| Jan 14, 4:09 AM CST | Wind Chill Advisory | OAX | 32 hr |
| Feb 9, 3:13 AM CST | Wind Advisory | OAX | 24 hr |
| Feb 11, 1:02 PM CST | Winter Storm Watch | OAX | 25 hr |
| Feb 12, 1:44 PM CST | Winter Storm Warning | OAX | 27 hr |
| Feb 12, 1:44 PM CST | Winter Weather Advisory | OAX | 24 hr |
| Feb 13, 11:07 AM CST | Mesoscale Discussion | SPC | 3 hr |
| Feb 27, 6:22 PM CST | Mesoscale Discussion | SPC | 4 hr |
| Mar 6, 9:17 PM CST | Mesoscale Discussion | SPC | 118 min |
| Mar 9, 3:48 PM CDT | Winter Weather Advisory | OAX | 23 hr |
| Mar 22, 3:13 PM CDT | Wind Advisory | OAX | 31 hr |
| Mar 23, 10:13 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Mar 23, 11:01 AM CDT | High Wind Warning | OAX | 8 hr |
| Mar 23, 12:16 PM CDT | Tornado Watch | SPC | 4 hr |
| Mar 23, 3:11 PM CDT | Mesoscale Discussion | SPC | 94 min |
| Mar 23, 3:50 PM CDT | Tornado Watch | SPC | 6 hr |
| Mar 23, 3:57 PM CDT | Severe Thunderstorm Warning | OAX | 48 min |
| Mar 31, 11:22 AM CDT | Wind Advisory | OAX | 8 hr |
| Apr 4, 3:00 AM CDT | Wind Advisory | OAX | 16 hr |
| Apr 4, 1:12 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 4, 2:06 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Apr 4, 3:52 PM CDT | Mesoscale Discussion | SPC | 53 min |
| Apr 4, 4:48 PM CDT | Severe Thunderstorm Warning | OAX | 27 min |
| Apr 5, 3:30 AM CDT | Winter Weather Advisory | OAX | 13 hr |
| Apr 5, 11:39 AM CDT | Wind Advisory | OAX | 7 hr |
| Apr 20, 2:01 PM CDT | Red Flag Warning | OAX | 5 hr |
| Apr 24, 7:16 PM CDT | Severe Thunderstorm Warning | OAX | 59 min |
| Apr 25, 10:09 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Apr 26, 9:18 AM CDT | Mesoscale Discussion | SPC | 27 min |
| Apr 26, 9:34 AM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Apr 26, 12:27 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 26, 12:30 PM CDT | Mesoscale Discussion | SPC | 60 min |
| Apr 26, 12:48 PM CDT | Tornado Watch | SPC | 4 hr |
| Apr 26, 1:12 PM CDT | Severe Thunderstorm Warning | OAX | 63 min |
| Apr 26, 2:41 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| May 15, 2:03 AM CDT | Mesoscale Discussion | SPC | 87 min |
| May 15, 7:14 AM CDT | Mesoscale Discussion | SPC | 91 min |
| May 15, 7:42 AM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| May 20, 3:44 AM CDT | Wind Advisory | OAX | 16 hr |
| Jun 1, 2:55 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 1, 3:29 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 1, 3:44 PM CDT | Flash Flood Watch | OAX | 15 hr |
| Jun 1, 5:25 PM CDT | Severe Thunderstorm Warning | OAX | 35 min |
| Jun 1, 5:25 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 1, 5:57 PM CDT | Severe Thunderstorm Warning | OAX | 47 min |
| Jun 1, 6:52 PM CDT | Mesoscale Discussion | SPC | 83 min |
| Jun 1, 9:27 PM CDT | Mesoscale Discussion | SPC | 63 min |
| Jun 6, 12:35 AM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jun 6, 12:58 AM CDT | Severe Thunderstorm Warning | OAX | 62 min |
| Jun 6, 1:54 AM CDT | Severe Thunderstorm Warning | OAX | 66 min |
| Jun 6, 2:22 AM CDT | Mesoscale Discussion | SPC | 23 min |
| Jun 6, 5:21 PM CDT | Mesoscale Discussion | SPC | 114 min |
| Jun 6, 9:01 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 6, 10:40 PM CDT | Severe Thunderstorm Warning | OAX | 33 min |
| Jun 6, 10:55 PM CDT | Severe Thunderstorm Warning | OAX | 50 min |
| Jun 6, 11:01 PM CDT | Severe Thunderstorm Warning | OAX | 44 min |
| Jun 6, 11:04 PM CDT | Mesoscale Discussion | SPC | 86 min |
| Jun 6, 11:40 PM CDT | Severe Thunderstorm Warning | OAX | 50 min |
| Jun 7, 12:11 AM CDT | Severe Thunderstorm Warning | OAX | 49 min |
| Jun 7, 3:45 PM CDT | Tornado Watch | SPC | 7 hr |
| Jun 7, 10:53 PM CDT | Tornado Watch | SPC | 5 hr |
| Jun 7, 11:20 PM CDT | Severe Thunderstorm Warning | OAX | 40 min |
| Jun 9, 7:16 AM CDT | Mesoscale Discussion | SPC | 59 min |
| Jun 14, 10:36 PM CDT | Mesoscale Discussion | SPC | 114 min |
| Jun 14, 11:45 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 15, 2:57 PM CDT | Mesoscale Discussion | SPC | 63 min |
| Jun 15, 4:01 PM CDT | Flash Flood Watch | OAX | 10 hr |
| Jun 15, 7:33 PM CDT | Mesoscale Discussion | SPC | 87 min |
| Jun 15, 8:14 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 15, 8:29 PM CDT | Severe Thunderstorm Warning | OAX | 25 min |
| Jun 15, 9:32 PM CDT | Mesoscale Discussion | SPC | 88 min |
| Jun 15, 11:18 PM CDT | Mesoscale Discussion | SPC | 87 min |
| Jun 17, 12:17 PM CDT | Mesoscale Discussion | SPC | 58 min |
| Jun 17, 12:47 PM CDT | Severe Thunderstorm Warning | OAX | 58 min |
| Jun 17, 12:52 PM CDT | Tornado Watch | SPC | 8 hr |
| Jun 17, 1:39 PM CDT | Severe Thunderstorm Warning | OAX | 66 min |
| Jun 17, 2:47 PM CDT | Mesoscale Discussion | SPC | 28 min |
| Jun 17, 5:43 PM CDT | Mesoscale Discussion | SPC | 92 min |
| Jun 17, 9:04 PM CDT | Tornado Watch | SPC | 3 hr |
| Jun 17, 11:33 PM CDT | Mesoscale Discussion | SPC | 87 min |
| Jun 21, 12:56 AM CDT | Mesoscale Discussion | SPC | 94 min |
| Jun 21, 3:46 PM CDT | Heat Advisory | OAX | 3 days |
| Jun 24, 3:36 PM CDT | Mesoscale Discussion | SPC | 114 min |
| Jul 3, 3:43 PM CDT | Mesoscale Discussion | SPC | 92 min |
| Jul 3, 4:54 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 3, 9:20 PM CDT | Mesoscale Discussion | SPC | 55 min |
| Jul 9, 9:32 AM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jul 12, 4:48 AM CDT | Mesoscale Discussion | SPC | 57 min |
| Jul 24, 5:37 PM CDT | Mesoscale Discussion | SPC | 53 min |
| Aug 4, 1:10 AM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 8, 3:38 AM CDT | Heat Advisory | OAX | 14 hr |
| Aug 9, 1:18 PM CDT | Mesoscale Discussion | SPC | 27 min |
| Aug 9, 3:44 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 19, 5:32 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 19, 6:27 PM CDT | Severe Thunderstorm Warning | OAX | 48 min |
| Aug 26, 5:45 AM CDT | Mesoscale Discussion | SPC | 90 min |
| Sep 3, 2:24 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 3, 5:07 PM CDT | Mesoscale Discussion | SPC | 83 min |
| Sep 5, 6:59 AM CDT | Dense Fog Advisory | OAX | 2 hr |
| Sep 11, 7:44 PM CDT | Areal Flood Advisory | OAX | 3 hr |
| Oct 1, 3:10 PM CDT | Wind Advisory | OAX | 24 hr |
| Oct 3, 3:39 PM CDT | Frost Advisory | OAX | 16 hr |
| Oct 9, 4:13 AM CDT | Freeze Watch | OAX | 11 hr |
| Oct 9, 4:13 AM CDT | Freeze Warning | OAX | 29 hr |
| Oct 10, 5:56 AM CDT | Mesoscale Discussion | SPC | 5 hr |
| Nov 15, 2:55 PM CST | Winter Weather Advisory | OAX | 30 hr |
| Nov 16, 9:20 AM CST | Winter Storm Warning | OAX | 8 hr |
| Nov 20, 3:54 AM CST | Dense Fog Advisory | OAX | 6 hr |
| Dec 6, 4:20 AM CST | Winter Storm Watch | OAX | 35 hr |
| Dec 6, 4:20 AM CST | Winter Weather Advisory | OAX | 23 hr |
| Dec 7, 4:04 AM CST | Winter Storm Warning | OAX | 41 hr |
| Dec 7, 3:45 PM CST | Blizzard Watch | OAX | 21 hr |
| Dec 8, 11:22 AM CST | Mesoscale Discussion | SPC | 5 hr |
| Dec 8, 12:55 PM CST | Blizzard Warning | OAX | 17 hr |
| Dec 8, 9:38 PM CST | Mesoscale Discussion | SPC | 6 hr |
| Dec 9, 5:42 AM CST | Winter Weather Advisory | OAX | 10 hr |
| Dec 9, 3:34 PM CST | Wind Chill Advisory | OAX | 18 hr |
| Dec 13, 8:17 PM CST | Winter Weather Advisory | OAX | 13 hr |
| Dec 21, 4:01 AM CST | Winter Storm Watch | OAX | 60 hr |
| Dec 22, 3:47 PM CST | Winter Storm Warning | OAX | 56 hr |
| Dec 22, 3:47 PM CST | Winter Weather Advisory | OAX | 32 hr |
| Dec 22, 3:47 PM CST | Freezing Rain Advisory | OAX | 13 hr |
| Dec 23, 6:44 AM CST | Mesoscale Discussion | SPC | 4 hr |
| Dec 24, 4:00 PM CST | Blizzard Warning | OAX | 44 hr |
| Dec 25, 3:26 PM CST | Winter Weather Advisory | OAX | 39 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 | 18 |
| Severe Thunderstorm Watch | 14 |
| Tornado Watch | 7 |
| Mesoscale Discussion | 44 |
| Flooding | |
| Flash Flood Watch | 2 |
| Areal Flood Advisory | 1 |
| Winter | |
| Blizzard Warning | 2 |
| Winter Storm Warning | 4 |
| Blizzard Watch | 1 |
| Winter Storm Watch | 3 |
| Freezing Rain Advisory | 2 |
| Winter Weather Advisory | 10 |
| Heat | |
| Heat Advisory | 2 |
| Cold | |
| Freeze Warning | 1 |
| Freeze Watch | 1 |
| Frost Advisory | 1 |
| Wind Chill Advisory | 2 |
| Wind and dust | |
| High Wind Warning | 1 |
| Wind Advisory | 9 |
| Fire | |
| Red Flag Warning | 1 |
| Fog and smoke | |
| Dense Fog Advisory | 2 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20082010
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.