Alert archive / Minnesota / Norman County
Weather alerts in Norman County, Minnesota, 2008
148 weather alerts in 2008, 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 2008. Tap one for its archive.
- Alerts
- 148
- Warnings
- 36
- Watches
- 25
- Advisories
- 59
- Busiest month
- July29 alerts
- Busiest day
- June 14, 20087 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 1 tornado warnings covering Norman County in 2008 had a tornado report inside them; 1 of 1 tornado reports fell inside a warning, on average 7 minutes after it went out.
Norman County, 2008
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 1 | 1 | 0% | 1 | 100% | 7 min |
| Severe thunderstorm warnings | 16 | 9 | 44% | 6 | 100% | 23 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2008
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Grand Forks, ND: tornado warnings | 58 | 26 | 55% | 53 | 75% | 21 min |
| NWS Grand Forks, ND: severe thunderstorm warnings | 217 | 91 | 58% | 196 | 76% | 26 min |
| NWS Grand Forks, ND: flash flood warnings | 9 | 7 | 22% | 17 | 82% | 112 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 2, 10:40 PM CST | Wind Advisory | FGF | 7 hr |
| Jan 13, 9:14 PM CST | Wind Chill Advisory | FGF | 7 hr |
| Jan 14, 4:27 AM CST | Wind Chill Advisory | FGF | 4 hr |
| Jan 14, 9:46 PM CST | Wind Chill Advisory | FGF | 10 hr |
| Jan 16, 1:04 AM CST | Winter Weather Advisory | FGF | 11 hr |
| Jan 17, 3:46 AM CST | Wind Chill Advisory | FGF | 56 hr |
| Jan 17, 3:46 AM CST | Winter Weather Advisory | FGF | 12 hr |
| Jan 17, 3:18 PM CST | Wind Chill Warning | FGF | 21 hr |
| Jan 22, 3:51 PM CST | Wind Chill Advisory | FGF | 11 hr |
| Jan 27, 2:54 PM CST | Winter Storm Watch | FGF | 24 hr |
| Jan 28, 4:19 AM CST | Winter Weather Advisory | FGF | 35 hr |
| Jan 28, 3:20 PM CST | Wind Chill Warning | FGF | 45 hr |
| Jan 30, 11:54 AM CST | Wind Chill Advisory | FGF | 8 hr |
| Feb 7, 3:47 AM CST | Blizzard Watch | FGF | 42 hr |
| Feb 8, 3:37 PM CST | Blizzard Warning | FGF | 26 hr |
| Feb 8, 3:37 PM CST | Winter Weather Advisory | FGF | 26 hr |
| Feb 9, 3:12 PM CST | Wind Chill Warning | FGF | 21 hr |
| Feb 10, 3:41 PM CST | Wind Chill Advisory | FGF | 20 hr |
| Feb 12, 4:04 AM CST | Winter Storm Watch | FGF | 24 hr |
| Feb 13, 3:58 AM CST | Winter Storm Warning | FGF | 24 hr |
| Feb 13, 3:24 PM CST | Wind Chill Advisory | FGF | 21 hr |
| Feb 13, 4:09 PM CST | Mesoscale Discussion | SPC | 6 hr |
| Feb 16, 4:11 AM CST | Winter Weather Advisory | FGF | 17 hr |
| Feb 17, 9:47 AM CST | Snow and Blowing Snow Advisory | FGF | 10 hr |
| Feb 17, 7:40 PM CST | Wind Chill Advisory | FGF | 19 hr |
| Feb 19, 3:56 AM CST | Wind Chill Advisory | FGF | 6 hr |
| Feb 19, 10:13 AM CST | Wind Chill Warning | FGF | 18 hr |
| Feb 20, 3:26 PM CST | Wind Chill Advisory | FGF | 19 hr |
| Mar 2, 4:13 AM CST | Wind Advisory | FGF | 5 hr |
| Mar 2, 9:16 AM CST | Winter Weather Advisory | FGF | 12 hr |
| Mar 29, 2:46 PM CDT | Wind Advisory | FGF | 6 hr |
| Mar 29, 11:12 PM CDT | Wind Advisory | FGF | 11 hr |
| Apr 4, 2:52 PM CDT | Winter Storm Watch | FGF | 27 hr |
| Apr 5, 5:38 PM CDT | Winter Storm Warning | FGF | 34 hr |
| Apr 5, 5:38 PM CDT | Winter Weather Advisory | FGF | 34 hr |
| Apr 5, 11:58 PM CDT | Mesoscale Discussion | SPC | 4 hr |
| Apr 9, 3:27 PM CDT | Winter Storm Watch | FGF | 23 hr |
| Apr 10, 2:30 PM CDT | Winter Storm Warning | FGF | 24 hr |
| Apr 14, 10:30 AM CDT | Wind Advisory | FGF | 11 hr |
| Apr 15, 4:46 AM CDT | Wind Advisory | FGF | 16 hr |
| Apr 20, 3:39 AM CDT | Wind Advisory | FGF | 18 hr |
| Apr 25, 4:54 AM CDT | Snow Advisory | FGF | 7 hr |
| Apr 25, 4:54 AM CDT | Winter Storm Warning | FGF | 38 hr |
| Apr 25, 11:53 AM CDT | Winter Weather Advisory | FGF | 24 hr |
| Apr 26, 11:36 AM CDT | Wind Advisory | FGF | 7 hr |
| May 2, 4:15 AM CDT | Wind Advisory | FGF | 17 hr |
| May 16, 4:19 AM CDT | Wind Advisory | FGF | 17 hr |
| May 17, 3:44 AM CDT | Wind Advisory | FGF | 17 hr |
| May 17, 2:56 PM CDT | Frost Advisory | FGF | 17 hr |
| May 20, 3:04 PM CDT | Frost Advisory | FGF | 16 hr |
| May 24, 4:09 AM CDT | Wind Advisory | FGF | 15 hr |
| May 24, 8:07 PM CDT | Tornado Watch | SPC | 3 hr |
| May 24, 9:26 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 26, 3:12 PM CDT | Freeze Warning | FGF | 16 hr |
| May 31, 2:07 PM CDT | Mesoscale Discussion | SPC | 53 min |
| May 31, 2:51 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 31, 6:23 PM CDT | Mesoscale Discussion | SPC | 67 min |
| Jun 5, 5:12 AM CDT | Flash Flood Watch | FGF | 22 hr |
| Jun 6, 10:09 AM CDT | Mesoscale Discussion | SPC | 96 min |
| Jun 6, 10:28 AM CDT | Tornado Watch | SPC | 5 hr |
| Jun 9, 1:37 PM CDT | Tornado Warning | FGF | 32 min |
| Jun 11, 8:25 AM CDT | High Wind Warning | FGF | 5 hr |
| Jun 11, 11:24 AM CDT | Wind Advisory | FGF | 8 hr |
| Jun 11, 1:44 PM CDT | High Wind Warning | FGF | 5 hr |
| Jun 12, 2:51 PM CDT | Mesoscale Discussion | SPC | 114 min |
| Jun 12, 3:33 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 12, 5:35 PM CDT | Severe Thunderstorm Warning | FGF | 55 min |
| Jun 12, 7:22 PM CDT | Mesoscale Discussion | SPC | 83 min |
| Jun 14, 2:49 PM CDT | Mesoscale Discussion | SPC | 26 min |
| Jun 14, 3:01 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 14, 4:55 PM CDT | Severe Thunderstorm Warning | FGF | 35 min |
| Jun 14, 5:26 PM CDT | Severe Thunderstorm Warning | FGF | 49 min |
| Jun 14, 6:01 PM CDT | Severe Thunderstorm Warning | FGF | 59 min |
| Jun 14, 6:04 PM CDT | Mesoscale Discussion | SPC | 86 min |
| Jun 14, 6:07 PM CDT | Severe Thunderstorm Warning | FGF | 53 min |
| Jun 14, 7:32 PM CDT | Severe Thunderstorm Warning | FGF | 58 min |
| Jun 14, 8:24 PM CDT | Severe Thunderstorm Warning | FGF | 36 min |
| Jun 14, 8:25 PM CDT | Mesoscale Discussion | SPC | 65 min |
| Jun 14, 8:44 PM CDT | Severe Thunderstorm Warning | FGF | 61 min |
| Jun 26, 6:46 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jun 28, 3:57 AM CDT | Wind Advisory | FGF | 16 hr |
| Jul 1, 3:51 PM CDT | Mesoscale Discussion | SPC | 114 min |
| Jul 1, 4:50 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 1, 7:53 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 5, 3:34 PM CDT | Mesoscale Discussion | SPC | 116 min |
| Jul 5, 5:08 PM CDT | Tornado Watch | SPC | 7 hr |
| Jul 5, 8:15 PM CDT | Mesoscale Discussion | SPC | 60 min |
| Jul 7, 2:45 PM CDT | Mesoscale Discussion | SPC | 60 min |
| Jul 7, 3:26 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 7, 5:08 PM CDT | Mesoscale Discussion | SPC | 67 min |
| Jul 7, 5:30 PM CDT | Tornado Watch | SPC | 3 hr |
| Jul 7, 6:18 PM CDT | Severe Thunderstorm Warning | FGF | 28 min |
| Jul 7, 6:49 PM CDT | Severe Thunderstorm Warning | FGF | 56 min |
| Jul 9, 3:34 PM CDT | Mesoscale Discussion | SPC | 86 min |
| Jul 10, 7:36 PM CDT | Tornado Watch | SPC | 6 hr |
| Jul 10, 9:59 PM CDT | Mesoscale Discussion | SPC | 91 min |
| Jul 11, 12:37 PM CDT | Mesoscale Discussion | SPC | 83 min |
| Jul 11, 2:26 PM CDT | Tornado Watch | SPC | 6 hr |
| Jul 11, 2:50 PM CDT | Severe Thunderstorm Warning | FGF | 55 min |
| Jul 11, 3:08 PM CDT | Severe Thunderstorm Warning | FGF | 67 min |
| Jul 11, 5:50 PM CDT | Mesoscale Discussion | SPC | 85 min |
| Jul 12, 4:20 AM CDT | Wind Advisory | FGF | 18 hr |
| Jul 14, 10:04 PM CDT | Severe Thunderstorm Warning | FGF | 56 min |
| Jul 16, 6:07 PM CDT | Mesoscale Discussion | SPC | 113 min |
| Jul 20, 6:02 AM CDT | Severe Thunderstorm Warning | FGF | 58 min |
| Jul 24, 4:06 PM CDT | Mesoscale Discussion | SPC | 54 min |
| Jul 28, 9:55 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 29, 12:36 AM CDT | Mesoscale Discussion | SPC | 84 min |
| Jul 29, 12:51 AM CDT | Severe Thunderstorm Warning | FGF | 54 min |
| Jul 29, 1:41 AM CDT | Severe Thunderstorm Warning | FGF | 64 min |
| Aug 13, 4:01 AM CDT | Dense Fog Advisory | FGF | 5 hr |
| Aug 21, 3:48 AM CDT | Wind Advisory | FGF | 17 hr |
| Aug 22, 9:06 PM CDT | Wind Advisory | FGF | 3 hr |
| Aug 26, 4:12 AM CDT | Wind Advisory | FGF | 16 hr |
| Aug 31, 3:29 AM CDT | Wind Advisory | FGF | 17 hr |
| Sep 1, 5:58 PM CDT | Areal Flood Advisory | FGF | 13 hr |
| Sep 11, 8:44 PM CDT | River Flood Watch | FGF | 15 hr |
| Sep 12, 4:13 AM CDT | Dense Fog Advisory | FGF | 6 hr |
| Sep 12, 10:11 AM CDT | River Flood Warning | FGF | 10 hr |
| Sep 23, 1:37 AM CDT | Mesoscale Discussion | SPC | 23 min |
| Sep 26, 10:15 AM CDT | Mesoscale Discussion | SPC | 90 min |
| Sep 29, 8:44 PM CDT | Frost Advisory | FGF | 10 hr |
| Oct 11, 8:56 PM CDT | River Flood Watch | FGF | 4 days |
| Oct 13, 11:42 AM CDT | River Flood Warning | FGF | 5 days |
| Oct 13, 3:20 PM CDT | Frost Advisory | FGF | 18 hr |
| Oct 25, 4:13 AM CDT | Wind Advisory | FGF | 39 hr |
| Oct 25, 3:37 PM CDT | Winter Weather Advisory | FGF | 24 hr |
| Nov 4, 1:38 PM CST | Flood Watch | FGF | 52 hr |
| Nov 5, 8:48 PM CST | River Flood Warning | FGF | 4 days |
| Nov 22, 9:57 PM CST | Freezing Rain Advisory | FGF | 4 hr |
| Dec 8, 2:56 AM CST | Winter Weather Advisory | FGF | 15 hr |
| Dec 12, 3:39 AM CST | Blizzard Watch | FGF | 25 hr |
| Dec 13, 4:03 AM CST | Blizzard Warning | FGF | 48 hr |
| Dec 14, 5:25 AM CST | Mesoscale Discussion | SPC | 5 hr |
| Dec 14, 12:02 PM CST | Mesoscale Discussion | SPC | 4 hr |
| Dec 15, 12:04 AM CST | Wind Chill Warning | FGF | 12 hr |
| Dec 15, 11:28 AM CST | Wind Chill Advisory | FGF | 6 hr |
| Dec 18, 2:48 PM CST | Winter Storm Watch | FGF | 24 hr |
| Dec 19, 4:01 AM CST | Winter Storm Warning | FGF | 38 hr |
| Dec 20, 11:36 AM CST | Winter Weather Advisory | FGF | 4 hr |
| Dec 20, 3:18 PM CST | Wind Chill Warning | FGF | 20 hr |
| Dec 21, 11:04 AM CST | Wind Chill Advisory | FGF | 10 hr |
| Dec 22, 3:25 PM CST | Winter Weather Advisory | FGF | 24 hr |
| Dec 26, 2:48 PM CST | Winter Weather Advisory | FGF | 20 hr |
| Dec 28, 2:53 PM CST | Winter Storm Watch | FGF | 20 hr |
| Dec 28, 2:53 PM CST | Winter Weather Advisory | FGF | 17 hr |
| Dec 29, 10:51 AM CST | Winter Weather Advisory | FGF | 28 hr |
| Dec 30, 2:40 PM CST | Wind Chill Advisory | FGF | 4 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 archive20072009
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.