Alert archive / North Dakota / Pembina County
Weather alerts in Pembina County, North Dakota, 2011
113 weather alerts in 2011, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Pembina County and its neighbors
Each county as a circle sized by its count in 2011. Tap one for its archive.
- Alerts
- 113
- Warnings
- 29
- Watches
- 20
- Advisories
- 51
- Busiest month
- July21 alerts
- Busiest day
- June 3, 20116 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
0 of 2 tornado warnings covering Pembina County in 2011 had a tornado report inside them.
Pembina County, 2011
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 2 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 7 | 6 | 14% | 9 | 89% | 25 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2011
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Grand Forks, ND: tornado warnings | 51 | 9 | 82% | 18 | 67% | 15 min |
| NWS Grand Forks, ND: severe thunderstorm warnings | 176 | 117 | 34% | 287 | 82% | 26 min |
| NWS Grand Forks, ND: flash flood warnings | 16 | 7 | 56% | 11 | 73% | 84 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, 4:11 AM CST | Winter Weather Advisory | FGF | 12 hr |
| Jan 1, 3:47 PM CST | Wind Chill Advisory | FGF | 17 hr |
| Jan 7, 1:19 PM CST | Winter Weather Advisory | FGF | 7 hr |
| Jan 14, 1:27 PM CST | Winter Weather Advisory | FGF | 13 hr |
| Jan 17, 3:43 AM CST | Winter Weather Advisory | FGF | 14 hr |
| Jan 17, 3:33 PM CST | Wind Chill Advisory | FGF | 17 hr |
| Jan 18, 3:10 PM CST | Wind Chill Advisory | FGF | 20 hr |
| Jan 19, 3:29 PM CST | Wind Chill Advisory | FGF | 3 days |
| Jan 19, 3:29 PM CST | Winter Weather Advisory | FGF | 18 hr |
| Jan 22, 3:45 PM CST | Wind Chill Advisory | FGF | 5 hr |
| Jan 23, 3:19 AM CST | Wind Chill Advisory | FGF | 9 hr |
| Jan 23, 8:44 AM CST | Winter Weather Advisory | FGF | 9 hr |
| Jan 24, 4:06 AM CST | Winter Weather Advisory | FGF | 10 hr |
| Jan 28, 6:34 PM CST | Wind Advisory | FGF | 5 hr |
| Jan 29, 3:14 PM CST | Wind Chill Advisory | FGF | 3 days |
| Feb 1, 3:18 PM CST | Wind Chill Warning | FGF | 21 hr |
| Feb 4, 4:25 AM CST | Winter Weather Advisory | FGF | 5 hr |
| Feb 6, 3:43 PM CST | Wind Chill Advisory | FGF | 44 hr |
| Feb 7, 3:26 PM CST | Wind Chill Warning | FGF | 21 hr |
| Feb 8, 3:01 PM CST | Wind Chill Advisory | FGF | 21 hr |
| Feb 9, 3:26 PM CST | Wind Chill Advisory | FGF | 19 hr |
| Feb 12, 3:58 AM CST | High Wind Watch | FGF | 26 hr |
| Feb 13, 5:47 AM CST | Wind Advisory | FGF | 18 hr |
| Feb 17, 12:12 PM CST | Winter Weather Advisory | FGF | 18 hr |
| Feb 20, 4:18 AM CST | Wind Chill Advisory | FGF | 29 hr |
| Feb 24, 3:33 PM CST | Wind Chill Advisory | FGF | 19 hr |
| Feb 25, 3:02 PM CST | Wind Chill Advisory | FGF | 21 hr |
| Mar 1, 3:54 AM CST | Wind Chill Advisory | FGF | 29 hr |
| Mar 10, 4:20 PM CST | Winter Storm Watch | FGF | 12 hr |
| Mar 11, 4:26 AM CST | Blizzard Warning | FGF | 26 hr |
| Mar 15, 7:14 AM CDT | Freezing Rain Advisory | FGF | 3 hr |
| Mar 20, 9:07 AM CDT | Dense Fog Advisory | FGF | 6 hr |
| Mar 20, 3:27 PM CDT | Winter Storm Watch | FGF | 24 hr |
| Mar 21, 3:12 PM CDT | Winter Storm Warning | FGF | 45 hr |
| Mar 22, 3:20 PM CDT | Winter Weather Advisory | FGF | 12 hr |
| Apr 1, 3:38 PM CDT | Winter Storm Watch | FGF | 24 hr |
| Apr 1, 10:00 PM CDT | River Flood Warning | FGF | 56 days |
| Apr 2, 10:37 AM CDT | River Flood Warning | FGF | 53 days |
| Apr 2, 3:52 PM CDT | Winter Storm Warning | FGF | 12 hr |
| Apr 3, 3:58 AM CDT | Winter Weather Advisory | FGF | 11 hr |
| Apr 8, 1:49 PM CDT | River Flood Warning | FGF | 24 days |
| Apr 8, 1:49 PM CDT | River Flood Warning | FGF | 31 days |
| Apr 10, 12:14 PM CDT | Areal Flood Warning | FGF | 37 days |
| Apr 14, 3:13 PM CDT | Winter Weather Advisory | FGF | 38 hr |
| Apr 14, 8:20 PM CDT | Areal Flood Warning | FGF | 20 days |
| Apr 29, 9:24 AM CDT | Wind Advisory | FGF | 13 hr |
| Apr 30, 11:20 AM CDT | Wind Advisory | FGF | 32 hr |
| May 15, 2:23 PM CDT | Frost Advisory | FGF | 17 hr |
| May 22, 9:09 PM CDT | River Flood Warning | FGF | 13 hr |
| May 24, 2:46 PM CDT | Frost Advisory | FGF | 17 hr |
| May 25, 2:39 PM CDT | Freeze Warning | FGF | 17 hr |
| May 31, 3:44 AM CDT | Wind Advisory | FGF | 19 hr |
| May 31, 6:12 PM CDT | High Wind Warning | FGF | 3 hr |
| Jun 3, 1:11 AM CDT | Mesoscale Discussion | SPC | 94 min |
| Jun 3, 1:25 AM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jun 3, 3:30 AM CDT | Severe Thunderstorm Warning | FGF | 60 min |
| Jun 3, 3:39 AM CDT | Tornado Warning | FGF | 51 min |
| Jun 3, 4:23 AM CDT | Severe Thunderstorm Warning | FGF | 24 min |
| Jun 3, 4:32 AM CDT | Areal Flood Advisory | FGF | 6 hr |
| Jun 13, 7:22 PM CDT | Mesoscale Discussion | SPC | 83 min |
| Jun 25, 8:01 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jun 27, 10:51 AM CDT | River Flood Warning | FGF | 13 days |
| Jun 29, 3:49 PM CDT | Heat Advisory | FGF | 29 hr |
| Jul 4, 1:56 PM CDT | Mesoscale Discussion | SPC | 64 min |
| Jul 4, 3:06 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 4, 4:38 PM CDT | Severe Thunderstorm Warning | FGF | 52 min |
| Jul 4, 4:51 PM CDT | Tornado Warning | FGF | 39 min |
| Jul 4, 6:09 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 8, 5:38 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 15, 4:03 AM CDT | Excessive Heat Watch | FGF | 24 hr |
| Jul 16, 4:11 AM CDT | Heat Advisory | FGF | 4 days |
| Jul 16, 6:49 AM CDT | Dense Fog Advisory | FGF | 3 hr |
| Jul 16, 10:00 AM CDT | Mesoscale Discussion | SPC | 90 min |
| Jul 16, 4:57 PM CDT | Tornado Watch | SPC | 7 hr |
| Jul 16, 9:25 PM CDT | Mesoscale Discussion | SPC | 95 min |
| Jul 16, 10:41 PM CDT | Areal Flood Advisory | FGF | 8 hr |
| Jul 17, 9:15 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 17, 9:58 AM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 20, 5:02 AM CDT | Mesoscale Discussion | SPC | 88 min |
| Jul 20, 5:25 AM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 20, 5:41 AM CDT | Severe Thunderstorm Warning | FGF | 34 min |
| Jul 20, 8:08 AM CDT | Severe Thunderstorm Warning | FGF | 67 min |
| Jul 20, 8:59 AM CDT | Areal Flood Advisory | FGF | 6 hr |
| Jul 24, 3:35 AM CDT | Dense Fog Advisory | FGF | 5 hr |
| Jul 31, 10:26 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Aug 1, 5:57 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 1, 6:10 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 5, 4:20 AM CDT | Flash Flood Watch | FGF | 32 hr |
| Aug 18, 3:43 PM CDT | Mesoscale Discussion | SPC | 92 min |
| Sep 1, 12:48 AM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Sep 1, 1:57 AM CDT | Severe Thunderstorm Warning | FGF | 63 min |
| Sep 1, 2:49 AM CDT | Severe Thunderstorm Warning | FGF | 56 min |
| Sep 1, 3:40 AM CDT | Mesoscale Discussion | SPC | 65 min |
| Sep 13, 3:29 AM CDT | Freeze Watch | FGF | 24 hr |
| Sep 13, 2:55 PM CDT | Frost Advisory | FGF | 18 hr |
| Sep 14, 3:37 AM CDT | Freeze Warning | FGF | 28 hr |
| Sep 19, 9:27 AM CDT | High Wind Watch | FGF | 25 hr |
| Sep 20, 4:11 AM CDT | Wind Advisory | FGF | 24 hr |
| Sep 21, 2:57 PM CDT | Frost Advisory | FGF | 18 hr |
| Oct 4, 3:09 PM CDT | Fire Weather Watch | FGF | 13 hr |
| Oct 5, 4:21 AM CDT | Red Flag Warning | FGF | 41 hr |
| Oct 6, 4:03 AM CDT | Wind Advisory | FGF | 17 hr |
| Oct 6, 4:26 AM CDT | Fire Weather Watch | FGF | 24 hr |
| Oct 6, 3:08 PM CDT | High Wind Watch | FGF | 13 hr |
| Oct 7, 4:15 AM CDT | Red Flag Warning | FGF | 17 hr |
| Oct 7, 4:16 AM CDT | High Wind Warning | FGF | 17 hr |
| Oct 16, 11:05 AM CDT | Wind Advisory | FGF | 7 hr |
| Nov 3, 2:10 PM CDT | Fire Weather Watch | FGF | 15 hr |
| Nov 4, 4:41 AM CDT | Red Flag Warning | FGF | 15 hr |
| Nov 4, 4:55 AM CDT | Wind Advisory | FGF | 13 hr |
| Nov 6, 5:00 AM CST | Wind Advisory | FGF | 16 hr |
| Dec 14, 4:20 AM CST | Freezing Rain Advisory | FGF | 11 hr |
| Dec 31, 4:40 AM CST | Winter Weather Advisory | FGF | 7 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 archive20102012
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.