Alert archive / North Dakota / Nelson County
Weather alerts in Nelson County, North Dakota, 2019
143 weather alerts in 2019, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Nelson County and its neighbors
Each county as a circle sized by its count in 2019. Tap one for its archive.
- Alerts
- 143
- Warnings
- 36
- Watches
- 21
- Advisories
- 60
- Busiest month
- January23 alerts
- Busiest day
- September 21, 201910 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 Nelson County in 2019 had a tornado report inside them; 2 of 2 tornado reports fell inside a warning, on average 11 minutes after it went out.
Nelson County, 2019
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 2 | 1 | 50% | 2 | 100% | 11 min |
| Severe thunderstorm warnings | 11 | 11 | 0% | 11 | 73% | 22 min |
| Flash flood warnings | 2 | 1 | 50% | 1 | 100% | 383 min |
Each office's whole area, 2019
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Grand Forks, ND: tornado warnings | 27 | 13 | 52% | 33 | 79% | 12 min |
| NWS Grand Forks, ND: severe thunderstorm warnings | 223 | 180 | 19% | 428 | 85% | 25 min |
| NWS Grand Forks, ND: flash flood warnings | 13 | 6 | 54% | 12 | 100% | 154 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, 9:04 AM CST | Wind Chill Advisory | FGF | 19 hr |
| Jan 4, 9:44 PM CST | Dense Fog Advisory | FGF | 12 hr |
| Jan 6, 4:04 AM CST | Winter Weather Advisory | FGF | 29 hr |
| Jan 7, 3:23 PM CST | Wind Advisory | FGF | 27 hr |
| Jan 9, 3:24 AM CST | Wind Chill Advisory | FGF | 6 hr |
| Jan 14, 9:52 AM CST | Dense Fog Advisory | FGF | 19 hr |
| Jan 15, 6:29 PM CST | Wind Chill Advisory | FGF | 15 hr |
| Jan 17, 3:36 AM CST | Wind Chill Advisory | FGF | 56 hr |
| Jan 19, 2:59 PM CST | Wind Chill Advisory | FGF | 21 hr |
| Jan 20, 3:25 PM CST | Wind Chill Advisory | FGF | 12 hr |
| Jan 21, 3:43 AM CST | Winter Weather Advisory | FGF | 32 hr |
| Jan 22, 4:01 AM CST | Winter Storm Watch | FGF | 24 hr |
| Jan 23, 3:58 AM CST | Blizzard Warning | FGF | 26 hr |
| Jan 23, 3:58 AM CST | Winter Weather Advisory | FGF | 35 hr |
| Jan 23, 2:47 PM CST | Wind Chill Advisory | FGF | 45 hr |
| Jan 25, 2:39 PM CST | Wind Chill Advisory | FGF | 18 hr |
| Jan 26, 4:51 AM CST | Winter Storm Watch | FGF | 24 hr |
| Jan 26, 2:42 PM CST | Wind Chill Advisory | FGF | 21 hr |
| Jan 27, 4:21 AM CST | Blizzard Warning | FGF | 24 hr |
| Jan 27, 4:21 AM CST | Winter Storm Warning | FGF | 11 hr |
| Jan 27, 4:21 AM CST | Winter Weather Advisory | FGF | 29 hr |
| Jan 28, 4:31 AM CST | Wind Chill Warning | FGF | 3 days |
| Jan 28, 2:41 PM CST | Winter Weather Advisory | FGF | 27 hr |
| Feb 1, 2:46 PM CST | Winter Storm Watch | FGF | 37 hr |
| Feb 2, 2:24 PM CST | Winter Storm Warning | FGF | 46 hr |
| Feb 3, 4:13 AM CST | Winter Weather Advisory | FGF | 38 hr |
| Feb 4, 2:58 PM CST | Wind Chill Advisory | FGF | 21 hr |
| Feb 5, 3:05 PM CST | Winter Storm Watch | FGF | 14 hr |
| Feb 6, 4:41 AM CST | Winter Weather Advisory | FGF | 40 hr |
| Feb 7, 3:06 PM CST | Wind Chill Warning | FGF | 21 hr |
| Feb 8, 3:31 AM CST | Wind Chill Advisory | FGF | 32 hr |
| Feb 9, 2:25 PM CST | Wind Chill Advisory | FGF | 21 hr |
| Feb 11, 3:20 AM CST | Winter Weather Advisory | FGF | 27 hr |
| Feb 13, 3:34 PM CST | Winter Weather Advisory | FGF | 26 hr |
| Feb 14, 3:19 AM CST | Wind Chill Advisory | FGF | 33 hr |
| Feb 18, 2:43 PM CST | Wind Chill Advisory | FGF | 19 hr |
| Feb 23, 3:29 AM CST | Winter Storm Watch | FGF | 11 hr |
| Feb 23, 2:51 PM CST | Blizzard Warning | FGF | 25 hr |
| Feb 23, 2:51 PM CST | Winter Weather Advisory | FGF | 28 hr |
| Feb 24, 6:40 PM CST | Wind Chill Warning | FGF | 17 hr |
| Feb 24, 6:40 PM CST | Wind Chill Advisory | FGF | 35 hr |
| Feb 26, 2:59 PM CST | Wind Chill Advisory | FGF | 21 hr |
| Feb 27, 11:09 AM CST | Winter Weather Advisory | FGF | 4 hr |
| Mar 1, 2:48 PM CST | Wind Chill Advisory | FGF | 30 hr |
| Mar 2, 3:24 AM CST | Wind Chill Warning | FGF | 33 hr |
| Mar 3, 3:53 AM CST | Wind Chill Advisory | FGF | 32 hr |
| Mar 4, 3:59 AM CST | Winter Weather Advisory | FGF | 17 hr |
| Mar 8, 4:14 AM CST | Winter Weather Advisory | FGF | 41 hr |
| Mar 12, 4:27 AM CDT | Winter Storm Watch | FGF | 33 hr |
| Mar 13, 5:13 AM CDT | Blizzard Warning | FGF | 38 hr |
| Mar 13, 6:04 PM CDT | Winter Weather Advisory | FGF | 25 hr |
| Mar 13, 6:26 PM CDT | Mesoscale Discussion | SPC | 6 hr |
| Mar 16, 3:21 AM CDT | Dense Fog Advisory | FGF | 8 hr |
| Mar 19, 1:57 AM CDT | Dense Fog Advisory | FGF | 13 hr |
| Mar 26, 11:11 PM CDT | Dense Fog Advisory | FGF | 12 hr |
| Apr 5, 6:56 AM CDT | Dense Fog Advisory | FGF | 6 hr |
| Apr 5, 9:44 PM CDT | Dense Fog Advisory | FGF | 39 hr |
| Apr 8, 8:09 PM CDT | Special Weather Statement | FGF | 51 min |
| Apr 9, 2:25 PM CDT | Areal Flood Advisory | FGF | 29 hr |
| Apr 10, 4:05 AM CDT | Winter Storm Watch | FGF | 12 hr |
| Apr 10, 2:38 PM CDT | Areal Flood Advisory | FGF | 5 days |
| Apr 10, 3:46 PM CDT | Winter Weather Advisory | FGF | 45 hr |
| Apr 24, 3:09 PM CDT | Fire Weather Watch | FGF | 12 hr |
| Apr 25, 3:06 AM CDT | Red Flag Warning | FGF | 17 hr |
| Apr 25, 3:09 AM CDT | Wind Advisory | FGF | 16 hr |
| Apr 27, 2:58 PM CDT | Winter Weather Advisory | FGF | 25 hr |
| Apr 28, 3:28 PM CDT | Winter Weather Advisory | FGF | 16 hr |
| May 15, 3:48 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 15, 7:34 PM CDT | Severe Thunderstorm Warning | FGF | 41 min |
| May 15, 8:05 PM CDT | Mesoscale Discussion | SPC | 115 min |
| May 16, 3:45 PM CDT | Frost Advisory | FGF | 16 hr |
| May 19, 3:45 AM CDT | Frost Advisory | FGF | 28 hr |
| Jun 7, 3:52 AM CDT | Wind Advisory | FGF | 15 hr |
| Jun 7, 7:24 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 7, 9:11 PM CDT | Severe Thunderstorm Warning | FGF | 49 min |
| Jun 29, 6:14 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 29, 6:53 AM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 29, 9:13 AM CDT | Severe Thunderstorm Warning | FGF | 47 min |
| Jun 29, 9:17 AM CDT | Mesoscale Discussion | SPC | 118 min |
| Jun 29, 9:58 AM CDT | Severe Thunderstorm Warning | FGF | 47 min |
| Jun 29, 10:05 AM CDT | High Wind Warning | FGF | 115 min |
| Jun 29, 9:39 PM CDT | Mesoscale Discussion | SPC | 96 min |
| Jul 3, 4:40 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 3, 5:41 PM CDT | Special Weather Statement | FGF | 34 min |
| Jul 3, 6:11 PM CDT | Special Weather Statement | FGF | 34 min |
| Jul 3, 6:22 PM CDT | Severe Thunderstorm Warning | FGF | 53 min |
| Jul 3, 7:11 PM CDT | Severe Thunderstorm Warning | FGF | 64 min |
| Jul 8, 1:27 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 8, 1:43 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 8, 2:53 PM CDT | Flash Flood Watch | FGF | 5 hr |
| Jul 8, 3:40 PM CDT | Mesoscale Discussion | SPC | 65 min |
| Jul 8, 5:41 PM CDT | Severe Thunderstorm Warning | FGF | 49 min |
| Jul 8, 5:50 PM CDT | Mesoscale Discussion | SPC | 115 min |
| Jul 8, 6:15 PM CDT | Special Weather Statement | FGF | 60 min |
| Jul 8, 6:29 PM CDT | Severe Thunderstorm Warning | FGF | 61 min |
| Jul 11, 7:25 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 28, 1:45 PM CDT | Special Weather Statement | FGF | 45 min |
| Jul 28, 2:12 PM CDT | Tornado Warning | FGF | 48 min |
| Jul 28, 2:16 PM CDT | Severe Thunderstorm Warning | FGF | 59 min |
| Jul 28, 2:44 PM CDT | Tornado Warning | FGF | 46 min |
| Jul 28, 2:45 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 3, 5:42 AM CDT | Dense Fog Advisory | FGF | 3 hr |
| Aug 4, 11:02 PM CDT | Mesoscale Discussion | SPC | 88 min |
| Aug 4, 11:29 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Aug 5, 3:08 AM CDT | Mesoscale Discussion | SPC | 97 min |
| Aug 19, 11:22 PM CDT | Mesoscale Discussion | SPC | 113 min |
| Aug 20, 12:44 AM CDT | Severe Thunderstorm Warning | FGF | 61 min |
| Aug 20, 2:24 AM CDT | Special Weather Statement | FGF | 51 min |
| Sep 2, 2:47 PM CDT | Mesoscale Discussion | SPC | 88 min |
| Sep 2, 4:43 PM CDT | Severe Thunderstorm Warning | FGF | 62 min |
| Sep 20, 6:50 PM CDT | Mesoscale Discussion | SPC | 85 min |
| Sep 20, 7:15 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Sep 20, 7:21 PM CDT | Special Weather Statement | FGF | 24 min |
| Sep 20, 7:26 PM CDT | Flash Flood Watch | FGF | 8 hr |
| Sep 20, 8:06 PM CDT | Special Weather Statement | FGF | 24 min |
| Sep 20, 9:27 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 20, 10:37 PM CDT | Flash Flood Warning | FGF | 8 hr |
| Sep 20, 11:33 PM CDT | Flash Flood Warning | FGF | 7 hr |
| Sep 21, 12:51 AM CDT | Areal Flood Warning | FGF | 7 hr |
| Sep 21, 6:58 AM CDT | Areal Flood Warning | FGF | 9 hr |
| Sep 21, 8:11 AM CDT | Areal Flood Warning | FGF | 8 hr |
| Sep 24, 5:16 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 30, 2:39 AM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Oct 3, 3:01 PM CDT | Frost Advisory | FGF | 10 hr |
| Oct 8, 4:14 AM CDT | Winter Storm Watch | FGF | 71 hr |
| Oct 9, 10:41 AM CDT | Winter Storm Warning | FGF | 67 hr |
| Oct 10, 12:46 PM CDT | Blizzard Warning | FGF | 48 hr |
| Nov 19, 3:17 PM CST | Winter Weather Advisory | FGF | 36 hr |
| Nov 20, 3:37 PM CST | Winter Storm Warning | FGF | 5 hr |
| Nov 27, 10:15 AM CST | Winter Storm Watch | FGF | 52 hr |
| Nov 29, 4:21 AM CST | Winter Storm Warning | FGF | 53 hr |
| Dec 1, 8:36 PM CST | Dense Fog Advisory | FGF | 6 hr |
| Dec 7, 3:07 AM CST | Dense Fog Advisory | FGF | 6 hr |
| Dec 8, 4:02 AM CST | Winter Weather Advisory | FGF | 26 hr |
| Dec 8, 6:48 PM CST | Mesoscale Discussion | SPC | 6 hr |
| Dec 9, 2:17 PM CST | Wind Chill Advisory | FGF | 46 hr |
| Dec 10, 4:13 AM CST | Wind Chill Advisory | FGF | 32 hr |
| Dec 13, 3:02 PM CST | Wind Chill Advisory | FGF | 21 hr |
| Dec 14, 3:29 PM CST | Wind Chill Advisory | FGF | 18 hr |
| Dec 26, 3:31 PM CST | Winter Storm Watch | FGF | 24 hr |
| Dec 27, 3:22 PM CST | Winter Storm Warning | FGF | 61 hr |
| Dec 27, 3:22 PM CST | Winter Weather Advisory | FGF | 70 hr |
| Dec 29, 8:48 AM CST | Blizzard Warning | FGF | 21 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 | 11 |
| Tornado Warning | 2 |
| Severe Thunderstorm Watch | 8 |
| Mesoscale Discussion | 18 |
| Special Weather Statement | 8 |
| Flooding | |
| Areal Flood Warning | 3 |
| Flash Flood Warning | 2 |
| Flash Flood Watch | 2 |
| Areal Flood Advisory | 2 |
| Winter | |
| Blizzard Warning | 6 |
| Winter Storm Warning | 6 |
| Winter Storm Watch | 10 |
| Winter Weather Advisory | 20 |
| Cold | |
| Wind Chill Warning | 4 |
| Frost Advisory | 3 |
| Wind Chill Advisory | 22 |
| Wind and dust | |
| High Wind Warning | 1 |
| Wind Advisory | 3 |
| Fire | |
| Red Flag Warning | 1 |
| Fire Weather Watch | 1 |
| Fog and smoke | |
| Dense Fog Advisory | 10 |
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.