Alert archive / Minnesota / Norman County
Weather alerts in Norman County, Minnesota, 2023
100 weather alerts in 2023, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Norman County and its neighbors
Each county as a circle sized by its count in 2023. Tap one for its archive.
- Alerts
- 100
- Warnings
- 30
- Watches
- 12
- Advisories
- 35
- Busiest month
- April13 alerts
- Busiest day
- June 24, 20239 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
5 of 5 tornado warnings covering Norman County in 2023 had a tornado report inside them; 4 of 5 tornado reports fell inside a warning, on average 27 minutes after it went out.
Norman County, 2023
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 5 | 5 | 0% | 5 | 80% | 27 min |
| Severe thunderstorm warnings | 7 | 3 | 57% | 3 | 67% | 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 Grand Forks, ND: tornado warnings | 17 | 7 | 59% | 19 | 53% | 30 min |
| NWS Grand Forks, ND: severe thunderstorm warnings | 146 | 74 | 49% | 152 | 75% | 25 min |
| NWS Grand Forks, ND: flash flood warnings | 4 | 4 | 0% | 8 | 63% | 37 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, 3:20 AM CST | Dense Fog Advisory | FGF | 12 hr |
| Jan 5, 3:52 AM CST | Dense Fog Advisory | FGF | 8 hr |
| Jan 9, 9:06 PM CST | Dense Fog Advisory | FGF | 15 hr |
| Jan 16, 8:14 AM CST | Winter Weather Advisory | FGF | 28 hr |
| Jan 18, 8:40 AM CST | Winter Weather Advisory | FGF | 9 hr |
| Jan 26, 3:59 AM CST | Winter Weather Advisory | FGF | 32 hr |
| Jan 26, 1:08 PM CST | Blizzard Warning | FGF | 11 hr |
| Jan 27, 12:36 AM CST | Blizzard Warning | FGF | 3 hr |
| Jan 27, 12:56 PM CST | Wind Chill Advisory | FGF | 53 hr |
| Jan 28, 1:50 PM CST | Wind Chill Warning | FGF | 46 hr |
| Jan 30, 1:19 AM CST | Wind Chill Advisory | FGF | 35 hr |
| Feb 1, 1:53 PM CST | Wind Chill Advisory | FGF | 46 hr |
| Feb 12, 4:44 AM CST | Dense Fog Advisory | FGF | 5 hr |
| Feb 13, 3:23 AM CST | Winter Storm Watch | FGF | 23 hr |
| Feb 14, 2:39 AM CST | Blizzard Warning | FGF | 32 hr |
| Feb 19, 3:18 AM CST | Winter Weather Advisory | FGF | 42 hr |
| Feb 20, 2:28 PM CST | Winter Storm Watch | FGF | 23 hr |
| Feb 21, 1:08 PM CST | Blizzard Warning | FGF | 47 hr |
| Feb 21, 1:08 PM CST | Wind Chill Advisory | FGF | 47 hr |
| Feb 23, 12:05 PM CST | Wind Chill Advisory | FGF | 22 hr |
| Feb 23, 12:05 PM CST | Winter Weather Advisory | FGF | 6 hr |
| Feb 24, 10:29 AM CST | Wind Chill Advisory | FGF | 24 hr |
| Feb 28, 2:52 AM CST | Winter Weather Advisory | FGF | 36 hr |
| Mar 3, 2:55 PM CST | Winter Storm Watch | FGF | 37 hr |
| Mar 6, 3:48 PM CST | Winter Weather Advisory | FGF | 45 hr |
| Mar 9, 1:49 PM CST | Winter Storm Watch | FGF | 37 hr |
| Mar 10, 1:47 PM CST | Blizzard Warning | FGF | 40 hr |
| Mar 11, 2:23 AM CST | Winter Weather Advisory | FGF | 34 hr |
| Mar 11, 10:08 AM CST | Mesoscale Discussion | SPC | 4 hr |
| Mar 11, 6:10 PM CST | Mesoscale Discussion | SPC | 4 hr |
| Mar 20, 3:53 AM CDT | Winter Storm Watch | FGF | 24 hr |
| Mar 21, 3:50 AM CDT | Winter Storm Warning | FGF | 24 hr |
| Apr 2, 3:29 AM CDT | Winter Storm Watch | FGF | 33 hr |
| Apr 3, 12:03 PM CDT | Blizzard Warning | FGF | 64 hr |
| Apr 4, 3:45 PM CDT | Mesoscale Discussion | SPC | 4 hr |
| Apr 5, 10:55 AM CDT | Winter Weather Advisory | FGF | 19 hr |
| Apr 7, 9:28 AM CDT | Winter Weather Advisory | FGF | 6 hr |
| Apr 12, 2:50 PM CDT | River Flood Warning | FGF | 72 hr |
| Apr 13, 11:20 AM CDT | Areal Flood Warning | FGF | 11 days |
| Apr 13, 3:20 PM CDT | River Flood Warning | FGF | 16 days |
| Apr 13, 3:29 PM CDT | River Flood Warning | FGF | 8 days |
| Apr 15, 10:43 AM CDT | River Flood Warning | FGF | 21 days |
| Apr 20, 4:01 AM CDT | Winter Weather Advisory | FGF | 41 hr |
| Apr 27, 3:53 AM CDT | Dense Fog Advisory | FGF | 6 hr |
| Apr 30, 3:19 AM CDT | Wind Advisory | FGF | 17 hr |
| May 1, 3:03 AM CDT | Red Flag Warning | FGF | 17 hr |
| May 27, 1:22 PM CDT | Fire Weather Watch | FGF | 14 hr |
| May 27, 1:22 PM CDT | Red Flag Warning | FGF | 8 hr |
| May 28, 2:55 AM CDT | Red Flag Warning | FGF | 18 hr |
| May 30, 3:07 PM CDT | Special Weather Statement | FGF | 23 min |
| May 30, 3:17 PM CDT | Severe Thunderstorm Warning | FGF | 43 min |
| May 30, 3:34 PM CDT | Severe Thunderstorm Warning | FGF | 41 min |
| May 30, 3:55 PM CDT | Severe Thunderstorm Warning | FGF | 50 min |
| May 30, 4:25 PM CDT | Special Weather Statement | FGF | 35 min |
| Jun 2, 3:20 PM CDT | Special Weather Statement | FGF | 25 min |
| Jun 24, 2:10 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 24, 3:06 PM CDT | Special Weather Statement | FGF | 39 min |
| Jun 24, 3:23 PM CDT | Tornado Warning | FGF | 37 min |
| Jun 24, 3:26 PM CDT | Tornado Warning | FGF | 34 min |
| Jun 24, 3:42 PM CDT | Tornado Watch | SPC | 5 hr |
| Jun 24, 3:45 PM CDT | Tornado Warning | FGF | 45 min |
| Jun 24, 3:58 PM CDT | Tornado Warning | FGF | 47 min |
| Jun 24, 4:14 PM CDT | Tornado Warning | FGF | 46 min |
| Jun 24, 5:58 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 24, 8:40 PM CDT | Severe Thunderstorm Warning | FGF | 35 min |
| Jul 7, 2:13 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 9, 8:11 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 13, 2:56 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 13, 4:03 PM CDT | Severe Thunderstorm Warning | FGF | 42 min |
| Jul 13, 4:39 PM CDT | Severe Thunderstorm Warning | FGF | 66 min |
| Jul 13, 4:48 PM CDT | Mesoscale Discussion | SPC | 87 min |
| Jul 25, 4:57 PM CDT | Mesoscale Discussion | SPC | 93 min |
| Jul 26, 1:33 AM CDT | Mesoscale Discussion | SPC | 117 min |
| Jul 27, 12:53 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 1, 3:22 PM CDT | Mesoscale Discussion | SPC | 113 min |
| Aug 1, 3:52 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Aug 1, 5:09 PM CDT | Special Weather Statement | FGF | 51 min |
| Aug 1, 5:44 PM CDT | Mesoscale Discussion | SPC | 91 min |
| Aug 1, 6:00 PM CDT | Special Weather Statement | FGF | 45 min |
| Aug 8, 3:42 PM CDT | Mesoscale Discussion | SPC | 93 min |
| Aug 11, 8:30 PM CDT | Special Weather Statement | FGF | 45 min |
| Aug 16, 3:32 AM CDT | Wind Advisory | FGF | 17 hr |
| Sep 4, 9:38 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Sep 17, 5:06 AM CDT | Dense Fog Advisory | FGF | 5 hr |
| Sep 29, 8:22 AM CDT | Severe Thunderstorm Warning | FGF | 38 min |
| Sep 29, 8:49 PM CDT | Dense Fog Advisory | FGF | 13 hr |
| Oct 5, 2:33 PM CDT | Freeze Watch | FGF | 24 hr |
| Oct 6, 10:39 AM CDT | Frost Advisory | FGF | 23 hr |
| Oct 9, 2:06 PM CDT | Freeze Warning | FGF | 20 hr |
| Nov 16, 11:17 AM CST | Wind Advisory | FGF | 5 hr |
| Dec 8, 3:37 AM CST | Winter Weather Advisory | FGF | 35 hr |
| Dec 9, 3:01 PM CST | Winter Weather Advisory | FGF | 3 hr |
| Dec 17, 9:46 AM CST | Wind Advisory | FGF | 10 hr |
| Dec 22, 1:58 AM CST | Dense Fog Advisory | FGF | 35 hr |
| Dec 24, 2:44 PM CST | Winter Storm Watch | FGF | 21 hr |
| Dec 24, 2:44 PM CST | Winter Weather Advisory | FGF | 61 hr |
| Dec 25, 3:02 AM CST | Ice Storm Warning | FGF | 49 hr |
| Dec 25, 7:56 PM CST | Mesoscale Discussion | SPC | 5 hr |
| Dec 28, 9:10 AM CST | Dense Fog Advisory | FGF | 6 hr |
| Dec 28, 3:17 PM CST | Dense Fog Advisory | FGF | 15 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.