Alert archive / Nebraska / Sherman County
Weather alerts in Sherman County, Nebraska, 2020
142 weather alerts in 2020, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Sherman County and its neighbors
Each county as a circle sized by its count in 2020. Tap one for its archive.
- Alerts
- 142
- Warnings
- 44
- Watches
- 23
- Advisories
- 37
- Busiest month
- July30 alerts
- Busiest day
- May 24, 20206 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Sherman County, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 21 | 12 | 43% | 9 | 100% | 29 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Hastings, NE: tornado warnings | 5 | 2 | 60% | 7 | 29% | 19 min |
| NWS Hastings, NE: severe thunderstorm warnings | 197 | 98 | 50% | 355 | 83% | 25 min |
| NWS Hastings, NE: flash flood warnings | 13 | 4 | 69% | 10 | 80% | 202 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 15, 2:59 PM CST | Winter Weather Advisory | GID | 60 hr |
| Jan 17, 2:30 PM CST | High Wind Warning | GID | 15 hr |
| Jan 18, 5:32 PM CST | Areal Flood Advisory | GID | 24 hr |
| Jan 19, 4:31 PM CST | Areal Flood Advisory | GID | 5 days |
| Jan 22, 2:38 PM CST | Winter Weather Advisory | GID | 27 hr |
| Jan 24, 3:06 PM CST | Areal Flood Advisory | GID | 72 hr |
| Jan 24, 10:43 PM CST | Dense Fog Advisory | GID | 11 hr |
| Jan 28, 2:02 PM CST | Dense Fog Advisory | GID | 20 hr |
| Jan 30, 7:41 AM CST | Dense Fog Advisory | GID | 3 hr |
| Feb 12, 3:27 AM CST | Wind Chill Advisory | GID | 31 hr |
| Feb 18, 3:09 PM CST | Winter Weather Advisory | GID | 29 hr |
| Feb 24, 3:26 PM CST | Winter Weather Advisory | GID | 27 hr |
| Mar 4, 2:44 PM CST | Red Flag Warning | GID | 28 hr |
| Mar 10, 12:25 AM CDT | Dense Fog Advisory | GID | 10 hr |
| Mar 10, 9:56 PM CDT | Dense Fog Advisory | GID | 13 hr |
| Mar 12, 3:37 AM CDT | Winter Storm Watch | GID | 12 hr |
| Mar 12, 3:08 PM CDT | Winter Weather Advisory | GID | 43 hr |
| Mar 18, 3:22 PM CDT | Winter Weather Advisory | GID | 36 hr |
| Mar 18, 10:12 PM CDT | Dense Fog Advisory | GID | 10 hr |
| Mar 23, 1:08 AM CDT | Dense Fog Advisory | GID | 9 hr |
| Mar 24, 5:07 AM CDT | Dense Fog Advisory | GID | 5 hr |
| Apr 2, 3:31 AM CDT | Winter Weather Advisory | GID | 25 hr |
| Apr 7, 3:27 AM CDT | Red Flag Warning | GID | 16 hr |
| Apr 9, 4:21 AM CDT | Red Flag Warning | GID | 16 hr |
| Apr 10, 3:23 PM CDT | Winter Storm Watch | GID | 23 hr |
| Apr 11, 2:43 PM CDT | Winter Weather Advisory | GID | 24 hr |
| Apr 11, 2:55 PM CDT | High Wind Warning | GID | 30 hr |
| Apr 15, 3:22 PM CDT | Winter Weather Advisory | GID | 31 hr |
| Apr 16, 1:29 PM CDT | Mesoscale Discussion | SPC | 4 hr |
| Apr 20, 3:29 AM CDT | Red Flag Warning | GID | 17 hr |
| Apr 27, 3:00 PM CDT | Red Flag Warning | GID | 29 hr |
| Apr 28, 5:31 PM CDT | Mesoscale Discussion | SPC | 119 min |
| Apr 28, 6:26 PM CDT | Special Weather Statement | GID | 49 min |
| Apr 28, 7:59 PM CDT | Special Weather Statement | GID | 46 min |
| Apr 28, 8:05 PM CDT | Special Weather Statement | GID | 40 min |
| May 7, 8:01 PM CDT | Special Weather Statement | GID | 44 min |
| May 9, 3:40 AM CDT | Freeze Warning | GID | 29 hr |
| May 10, 1:00 PM CDT | Freeze Warning | GID | 15 hr |
| May 14, 1:12 AM CDT | Dense Fog Advisory | GID | 9 hr |
| May 22, 2:45 PM CDT | Areal Flood Advisory | GID | 27 hr |
| May 23, 1:50 AM CDT | Dense Fog Advisory | GID | 8 hr |
| May 23, 11:58 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 24, 1:06 AM CDT | Special Weather Statement | GID | 24 min |
| May 24, 1:12 AM CDT | Severe Thunderstorm Warning | GID | 48 min |
| May 24, 1:29 AM CDT | Special Weather Statement | GID | 46 min |
| May 24, 1:50 AM CDT | Severe Thunderstorm Warning | GID | 40 min |
| May 24, 3:10 AM CDT | Flash Flood Watch | GID | 40 hr |
| Jun 2, 4:58 PM CDT | Mesoscale Discussion | SPC | 92 min |
| Jun 3, 5:53 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 3, 6:18 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 3, 7:38 PM CDT | Severe Thunderstorm Warning | GID | 52 min |
| Jun 3, 8:10 PM CDT | Severe Thunderstorm Warning | GID | 50 min |
| Jun 3, 8:39 PM CDT | Special Weather Statement | LBF | 51 min |
| Jun 3, 8:44 PM CDT | Severe Thunderstorm Warning | GID | 33 min |
| Jun 4, 7:42 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 4, 7:43 PM CDT | Special Weather Statement | GID | 47 min |
| Jun 4, 8:33 PM CDT | Severe Thunderstorm Warning | GID | 42 min |
| Jun 4, 8:52 PM CDT | Severe Thunderstorm Warning | GID | 38 min |
| Jun 4, 9:36 PM CDT | Mesoscale Discussion | SPC | 84 min |
| Jun 8, 2:40 PM CDT | High Wind Watch | GID | 13 hr |
| Jun 8, 3:16 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 9, 3:27 AM CDT | High Wind Warning | GID | 23 hr |
| Jun 20, 3:53 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 21, 2:19 PM CDT | Mesoscale Discussion | SPC | 116 min |
| Jun 21, 3:19 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 21, 6:08 PM CDT | Special Weather Statement | GID | 52 min |
| Jun 21, 6:10 PM CDT | Severe Thunderstorm Warning | GID | 50 min |
| Jun 21, 6:37 PM CDT | Severe Thunderstorm Warning | GID | 38 min |
| Jun 21, 6:59 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 22, 12:31 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 22, 6:57 PM CDT | Special Weather Statement | LBF | 48 min |
| Jun 25, 7:45 PM CDT | Mesoscale Discussion | SPC | 60 min |
| Jun 27, 8:22 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 28, 1:17 AM CDT | Severe Thunderstorm Warning | GID | 28 min |
| Jun 30, 5:48 PM CDT | Mesoscale Discussion | SPC | 87 min |
| Jun 30, 6:34 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 30, 8:20 PM CDT | Special Weather Statement | GID | 40 min |
| Jun 30, 8:34 PM CDT | Severe Thunderstorm Warning | GID | 41 min |
| Jun 30, 9:26 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 2, 7:04 PM CDT | Mesoscale Discussion | SPC | 116 min |
| Jul 8, 3:39 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 8, 5:10 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 8, 9:41 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 8, 10:28 PM CDT | Severe Thunderstorm Warning | GID | 47 min |
| Jul 8, 10:36 PM CDT | Severe Thunderstorm Warning | GID | 39 min |
| Jul 8, 11:06 PM CDT | Severe Thunderstorm Warning | GID | 39 min |
| Jul 10, 1:09 AM CDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 10, 2:34 PM CDT | Mesoscale Discussion | SPC | 116 min |
| Jul 10, 4:31 PM CDT | Severe Thunderstorm Warning | GID | 44 min |
| Jul 10, 5:05 PM CDT | Severe Thunderstorm Warning | GID | 40 min |
| Jul 10, 5:44 PM CDT | Severe Thunderstorm Warning | GID | 46 min |
| Jul 10, 11:00 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 10, 11:40 PM CDT | Severe Thunderstorm Warning | GID | 35 min |
| Jul 11, 12:12 AM CDT | Special Weather Statement | GID | 48 min |
| Jul 11, 12:18 AM CDT | Severe Thunderstorm Warning | GID | 42 min |
| Jul 11, 2:09 AM CDT | Severe Thunderstorm Warning | GID | 51 min |
| Jul 11, 3:11 AM CDT | Special Weather Statement | GID | 34 min |
| Jul 13, 8:55 PM CDT | Mesoscale Discussion | SPC | 65 min |
| Jul 13, 9:21 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jul 17, 3:28 AM CDT | Heat Advisory | GID | 38 hr |
| Jul 20, 2:14 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 20, 3:51 PM CDT | Mesoscale Discussion | SPC | 114 min |
| Jul 20, 11:29 PM CDT | Mesoscale Discussion | SPC | 91 min |
| Jul 24, 3:16 PM CDT | Heat Advisory | GID | 29 hr |
| Jul 25, 6:19 PM CDT | Mesoscale Discussion | SPC | 86 min |
| Jul 29, 6:36 PM CDT | Special Weather Statement | GID | 24 min |
| Aug 16, 1:56 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 16, 2:30 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 16, 5:26 PM CDT | Severe Thunderstorm Warning | GID | 49 min |
| Aug 30, 5:46 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Aug 30, 8:00 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 25, 3:26 AM CDT | Fire Weather Watch | GID | 11 hr |
| Sep 25, 2:12 PM CDT | Red Flag Warning | GID | 29 hr |
| Sep 28, 3:20 AM CDT | Frost Advisory | GID | 30 hr |
| Sep 29, 3:21 AM CDT | Red Flag Warning | GID | 16 hr |
| Sep 30, 10:21 AM CDT | Red Flag Warning | GID | 9 hr |
| Oct 1, 3:47 AM CDT | Freeze Warning | GID | 29 hr |
| Oct 3, 2:46 PM CDT | Frost Advisory | GID | 18 hr |
| Oct 5, 3:56 AM CDT | Red Flag Warning | GID | 16 hr |
| Oct 11, 3:10 AM CDT | Fire Weather Watch | GID | 12 hr |
| Oct 11, 3:33 PM CDT | Red Flag Warning | GID | 28 hr |
| Oct 13, 3:25 PM CDT | Fire Weather Watch | GID | 12 hr |
| Oct 13, 3:25 PM CDT | Red Flag Warning | GID | 28 hr |
| Oct 14, 3:23 AM CDT | Frost Advisory | GID | 31 hr |
| Oct 15, 2:41 AM CDT | Freeze Warning | GID | 31 hr |
| Oct 21, 3:24 PM CDT | Dense Fog Advisory | GID | 19 hr |
| Oct 23, 5:57 PM CDT | Winter Weather Advisory | GID | 67 hr |
| Nov 5, 2:14 AM CST | Fire Weather Watch | GID | 12 hr |
| Nov 5, 2:08 PM CST | Red Flag Warning | GID | 28 hr |
| Nov 7, 2:19 PM CST | High Wind Watch | GID | 13 hr |
| Nov 8, 3:24 AM CST | High Wind Warning | GID | 12 hr |
| Nov 9, 3:19 PM CST | Winter Weather Advisory | GID | 23 hr |
| Dec 7, 3:17 AM CST | Red Flag Warning | GID | 14 hr |
| Dec 10, 10:57 AM CST | Winter Weather Advisory | GID | 43 hr |
| Dec 14, 3:25 AM CST | Winter Weather Advisory | GID | 39 hr |
| Dec 15, 9:18 PM CST | Dense Fog Advisory | GID | 13 hr |
| Dec 22, 4:37 AM CST | High Wind Watch | GID | 10 hr |
| Dec 22, 3:05 PM CST | High Wind Warning | GID | 27 hr |
| Dec 22, 3:31 PM CST | Winter Weather Advisory | GID | 26 hr |
| Dec 23, 3:09 AM CST | Blizzard Warning | GID | 15 hr |
| Dec 27, 2:26 PM CST | Winter Storm Watch | GID | 13 hr |
| Dec 28, 3:01 AM CST | Winter Weather Advisory | GID | 42 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 | 21 |
| Severe Thunderstorm Watch | 12 |
| Mesoscale Discussion | 24 |
| Special Weather Statement | 14 |
| Flooding | |
| Flash Flood Watch | 1 |
| Areal Flood Advisory | 4 |
| Winter | |
| Blizzard Warning | 1 |
| Winter Storm Watch | 3 |
| Winter Weather Advisory | 15 |
| Heat | |
| Heat Advisory | 2 |
| Cold | |
| Freeze Warning | 4 |
| Frost Advisory | 3 |
| Wind Chill Advisory | 1 |
| Wind and dust | |
| High Wind Warning | 5 |
| High Wind Watch | 3 |
| Fire | |
| Red Flag Warning | 13 |
| Fire Weather Watch | 4 |
| Fog and smoke | |
| Dense Fog Advisory | 12 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20192021
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.