Alert archive / North Dakota / Griggs County
Weather alerts in Griggs County, North Dakota, 2015
125 weather alerts in 2015, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Griggs County and its neighbors
Each county as a circle sized by its count in 2015. Tap one for its archive.
- Alerts
- 125
- Warnings
- 27
- Watches
- 21
- Advisories
- 54
- Busiest month
- July24 alerts
- Busiest day
- June 20, 20155 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 Griggs County in 2015 had a tornado report inside them; 1 of 1 tornado reports fell inside a warning, on average 2 minutes after it went out.
Griggs County, 2015
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 2 | 1 | 50% | 1 | 100% | 2 min |
| Severe thunderstorm warnings | 9 | 8 | 11% | 3 | 33% | 16 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2015
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Grand Forks, ND: tornado warnings | 52 | 14 | 73% | 54 | 85% | 22 min |
| NWS Grand Forks, ND: severe thunderstorm warnings | 133 | 103 | 23% | 324 | 69% | 27 min |
| NWS Grand Forks, ND: flash flood warnings | 1 | 1 | 0% | 2 | 100% | 253 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, 4:17 AM CST | Winter Weather Advisory | FGF | 35 hr |
| Jan 3, 2:49 PM CST | Wind Chill Warning | FGF | 45 hr |
| Jan 5, 3:13 PM CST | Wind Chill Advisory | FGF | 33 hr |
| Jan 6, 3:41 AM CST | Wind Chill Warning | FGF | 32 hr |
| Jan 8, 3:06 AM CST | Winter Weather Advisory | FGF | 15 hr |
| Jan 8, 3:33 PM CST | Wind Chill Advisory | FGF | 20 hr |
| Jan 9, 3:30 PM CST | Wind Chill Advisory | FGF | 21 hr |
| Jan 11, 2:11 PM CST | Wind Chill Advisory | FGF | 20 hr |
| Jan 12, 3:11 PM CST | Wind Chill Advisory | FGF | 19 hr |
| Jan 17, 3:59 AM CST | Wind Advisory | FGF | 9 hr |
| Jan 28, 4:00 AM CST | Dense Fog Advisory | FGF | 8 hr |
| Jan 31, 3:16 PM CST | Wind Chill Advisory | FGF | 20 hr |
| Feb 9, 3:19 PM CST | Winter Weather Advisory | FGF | 37 hr |
| Feb 10, 11:15 AM CST | Winter Weather Advisory | FGF | 17 hr |
| Feb 11, 4:07 AM CST | Wind Chill Advisory | FGF | 32 hr |
| Feb 13, 3:15 PM CST | Wind Chill Advisory | FGF | 23 hr |
| Feb 15, 1:25 AM CST | Winter Weather Advisory | FGF | 8 hr |
| Feb 16, 3:29 PM CST | Wind Chill Advisory | FGF | 45 hr |
| Feb 17, 3:32 AM CST | Wind Chill Advisory | FGF | 55 hr |
| Feb 20, 2:50 PM CST | Wind Chill Advisory | FGF | 30 hr |
| Feb 21, 3:49 AM CST | Wind Chill Warning | FGF | 32 hr |
| Feb 22, 11:40 AM CST | Wind Chill Advisory | FGF | 21 hr |
| Feb 25, 3:12 PM CST | Wind Chill Advisory | FGF | 20 hr |
| Feb 26, 2:38 PM CST | Wind Chill Advisory | FGF | 19 hr |
| Mar 2, 2:32 PM CST | Wind Advisory | FGF | 27 hr |
| Mar 3, 3:28 PM CST | Wind Chill Advisory | FGF | 21 hr |
| Mar 4, 3:34 PM CST | Wind Chill Advisory | FGF | 18 hr |
| Mar 25, 3:36 AM CDT | Wind Advisory | FGF | 14 hr |
| Mar 28, 3:33 PM CDT | Wind Advisory | FGF | 27 hr |
| Mar 31, 3:13 PM CDT | Fire Weather Watch | FGF | 13 hr |
| Apr 1, 4:17 AM CDT | Red Flag Warning | FGF | 15 hr |
| Apr 2, 10:32 AM CDT | Wind Advisory | FGF | 8 hr |
| Apr 11, 3:27 AM CDT | Red Flag Warning | FGF | 17 hr |
| Apr 12, 1:46 PM CDT | Fire Weather Watch | FGF | 14 hr |
| Apr 13, 3:37 AM CDT | Red Flag Warning | FGF | 16 hr |
| Apr 13, 1:17 PM CDT | Wind Advisory | FGF | 5 hr |
| Apr 13, 3:06 PM CDT | Fire Weather Watch | FGF | 12 hr |
| Apr 14, 3:31 AM CDT | Fire Weather Watch | FGF | 24 hr |
| Apr 14, 3:31 AM CDT | Red Flag Warning | FGF | 17 hr |
| Apr 15, 3:15 AM CDT | Red Flag Warning | FGF | 17 hr |
| Apr 15, 3:38 AM CDT | Wind Advisory | FGF | 15 hr |
| Apr 15, 3:42 PM CDT | Special Weather Statement | FGF | 48 min |
| Apr 15, 4:44 PM CDT | Special Weather Statement | FGF | 61 min |
| Apr 19, 3:14 PM CDT | Fire Weather Watch | FGF | 13 hr |
| Apr 20, 5:31 AM CDT | Wind Advisory | FGF | 15 hr |
| Apr 21, 11:17 AM CDT | Wind Advisory | FGF | 8 hr |
| Apr 29, 2:59 PM CDT | Red Flag Warning | FGF | 28 hr |
| May 1, 3:10 PM CDT | Fire Weather Watch | FGF | 13 hr |
| May 2, 4:22 AM CDT | Red Flag Warning | FGF | 16 hr |
| May 2, 3:11 PM CDT | Special Weather Statement | FGF | 64 min |
| May 2, 3:54 PM CDT | Special Weather Statement | FGF | 51 min |
| May 4, 3:17 PM CDT | Fire Weather Watch | FGF | 13 hr |
| May 5, 4:45 AM CDT | Red Flag Warning | FGF | 14 hr |
| May 8, 2:52 PM CDT | Frost Advisory | FGF | 18 hr |
| May 16, 8:24 PM CDT | Special Weather Statement | FGF | 36 min |
| May 17, 3:58 AM CDT | Wind Advisory | FGF | 31 hr |
| May 18, 3:21 AM CDT | Freeze Warning | FGF | 30 hr |
| May 19, 2:53 PM CDT | Frost Advisory | FGF | 17 hr |
| May 28, 2:35 PM CDT | Mesoscale Discussion | SPC | 55 min |
| May 29, 3:18 PM CDT | Frost Advisory | FGF | 17 hr |
| Jun 2, 2:02 AM CDT | Special Weather Statement | FGF | 28 min |
| Jun 2, 2:46 PM CDT | Tornado Watch | SPC | 7 hr |
| Jun 13, 5:11 PM CDT | Mesoscale Discussion | SPC | 94 min |
| Jun 20, 5:36 PM CDT | Tornado Warning | FGF | 39 min |
| Jun 20, 6:13 PM CDT | Severe Thunderstorm Warning | FGF | 31 min |
| Jun 20, 6:25 PM CDT | Severe Thunderstorm Warning | FGF | 50 min |
| Jun 20, 6:33 PM CDT | Severe Thunderstorm Warning | FGF | 42 min |
| Jun 20, 6:58 PM CDT | Tornado Warning | FGF | 47 min |
| Jun 21, 8:32 PM CDT | Mesoscale Discussion | SPC | 88 min |
| Jun 21, 10:29 PM CDT | Severe Thunderstorm Warning | FGF | 61 min |
| Jun 21, 10:41 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 27, 2:01 PM CDT | Mesoscale Discussion | SPC | 119 min |
| Jun 27, 2:42 PM CDT | Tornado Watch | SPC | 7 hr |
| Jul 4, 6:49 PM CDT | Mesoscale Discussion | SPC | 116 min |
| Jul 5, 9:54 AM CDT | Mesoscale Discussion | SPC | 96 min |
| Jul 5, 10:18 AM CDT | Severe Thunderstorm Warning | FGF | 57 min |
| Jul 5, 10:40 AM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 5, 10:58 AM CDT | Severe Thunderstorm Warning | FGF | 62 min |
| Jul 5, 11:33 AM CDT | Severe Thunderstorm Warning | FGF | 38 min |
| Jul 11, 5:00 PM CDT | Mesoscale Discussion | SPC | 60 min |
| Jul 11, 5:40 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 11, 9:04 PM CDT | Mesoscale Discussion | SPC | 86 min |
| Jul 12, 2:54 PM CDT | Mesoscale Discussion | SPC | 96 min |
| Jul 12, 3:06 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 12, 5:53 PM CDT | Mesoscale Discussion | SPC | 97 min |
| Jul 12, 8:16 PM CDT | Mesoscale Discussion | SPC | 59 min |
| Jul 17, 1:10 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 17, 3:43 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 17, 6:02 PM CDT | Mesoscale Discussion | SPC | 118 min |
| Jul 23, 3:58 PM CDT | Severe Thunderstorm Watch | SPC | 11 hr |
| Jul 23, 9:54 PM CDT | Severe Thunderstorm Warning | FGF | 66 min |
| Jul 23, 10:28 PM CDT | Mesoscale Discussion | SPC | 32 min |
| Jul 23, 10:40 PM CDT | Severe Thunderstorm Warning | FGF | 65 min |
| Jul 24, 12:41 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 25, 4:30 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 27, 10:49 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 28, 4:02 AM CDT | Wind Advisory | FGF | 39 hr |
| Aug 15, 3:36 AM CDT | Heat Advisory | FGF | 15 hr |
| Aug 15, 3:38 PM CDT | Mesoscale Discussion | SPC | 67 min |
| Aug 15, 6:13 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 22, 9:42 AM CDT | Wind Advisory | FGF | 33 hr |
| Sep 10, 2:54 PM CDT | Frost Advisory | FGF | 18 hr |
| Sep 25, 3:44 AM CDT | Dense Fog Advisory | FGF | 7 hr |
| Sep 26, 3:50 AM CDT | Wind Advisory | FGF | 15 hr |
| Sep 28, 2:29 PM CDT | Frost Advisory | FGF | 18 hr |
| Oct 6, 3:41 PM CDT | Frost Advisory | FGF | 16 hr |
| Oct 8, 9:53 PM CDT | Frost Advisory | FGF | 10 hr |
| Oct 9, 3:03 AM CDT | Dense Fog Advisory | FGF | 7 hr |
| Oct 10, 3:38 PM CDT | High Wind Watch | FGF | 19 hr |
| Oct 11, 10:41 AM CDT | High Wind Warning | FGF | 29 hr |
| Oct 15, 3:36 AM CDT | Freeze Warning | FGF | 30 hr |
| Oct 28, 4:04 AM CDT | Wind Advisory | FGF | 19 hr |
| Oct 31, 3:40 AM CDT | Wind Advisory | FGF | 15 hr |
| Nov 3, 2:46 PM CST | Dense Fog Advisory | FGF | 31 hr |
| Nov 10, 2:33 AM CST | Dense Fog Advisory | FGF | 9 hr |
| Nov 11, 3:06 AM CST | High Wind Watch | FGF | 11 hr |
| Nov 11, 2:10 PM CST | Wind Advisory | FGF | 27 hr |
| Nov 17, 11:36 AM CST | High Wind Watch | FGF | 16 hr |
| Nov 18, 3:50 AM CST | High Wind Warning | FGF | 20 hr |
| Nov 18, 3:50 AM CST | Wind Advisory | FGF | 40 hr |
| Nov 30, 4:23 AM CST | Winter Weather Advisory | FGF | 35 hr |
| Dec 12, 5:03 PM CST | Dense Fog Advisory | FGF | 42 hr |
| Dec 14, 4:05 AM CST | Winter Storm Watch | FGF | 35 hr |
| Dec 15, 2:43 PM CST | Winter Storm Warning | FGF | 28 hr |
| Dec 22, 3:29 AM CST | Winter Weather Advisory | FGF | 27 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 | 9 |
| Tornado Warning | 2 |
| Severe Thunderstorm Watch | 8 |
| Tornado Watch | 2 |
| Mesoscale Discussion | 17 |
| Special Weather Statement | 6 |
| Winter | |
| Winter Storm Warning | 1 |
| Winter Storm Watch | 1 |
| Winter Weather Advisory | 7 |
| Heat | |
| Heat Advisory | 1 |
| Cold | |
| Freeze Warning | 2 |
| Wind Chill Warning | 3 |
| Frost Advisory | 7 |
| Wind Chill Advisory | 16 |
| Wind and dust | |
| High Wind Warning | 2 |
| High Wind Watch | 3 |
| Wind Advisory | 17 |
| Fire | |
| Red Flag Warning | 8 |
| Fire Weather Watch | 7 |
| Fog and smoke | |
| Dense Fog Advisory | 6 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20142016
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.