Alert archive / North Dakota / Cass County
Weather alerts in Cass County, North Dakota, 2016
128 weather alerts in 2016, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Cass County and its neighbors
Each county as a circle sized by its count in 2016. Tap one for its archive.
- Alerts
- 128
- Warnings
- 40
- Watches
- 20
- Advisories
- 32
- Busiest month
- July39 alerts
- Busiest day
- July 10, 201610 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 1 tornado warnings covering Cass County in 2016 had a tornado report inside them.
Cass County, 2016
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 1 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 26 | 25 | 4% | 25 | 84% | 18 min |
| Flash flood warnings | 1 | 1 | 0% | 0 |
Each office's whole area, 2016
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Grand Forks, ND: tornado warnings | 32 | 17 | 47% | 46 | 61% | 13 min |
| NWS Grand Forks, ND: severe thunderstorm warnings | 218 | 185 | 15% | 502 | 86% | 27 min |
| NWS Grand Forks, ND: flash flood warnings | 10 | 9 | 10% | 22 | 100% | 97 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 6, 9:05 PM CST | Winter Weather Advisory | FGF | 15 hr |
| Jan 6, 10:08 PM CST | Winter Storm Warning | FGF | 14 hr |
| Jan 8, 3:03 PM CST | Wind Chill Advisory | FGF | 45 hr |
| Jan 11, 2:28 PM CST | Wind Chill Advisory | FGF | 22 hr |
| Jan 14, 6:39 AM CST | Winter Weather Advisory | FGF | 14 hr |
| Jan 15, 3:53 AM CST | Wind Chill Advisory | FGF | 38 hr |
| Jan 16, 10:05 AM CST | Wind Chill Warning | FGF | 26 hr |
| Jan 16, 10:05 AM CST | Wind Chill Advisory | FGF | 50 hr |
| Jan 20, 5:08 AM CST | Freezing Rain Advisory | FGF | 7 hr |
| Feb 1, 2:11 AM CST | Dense Fog Advisory | FGF | 10 hr |
| Feb 5, 3:13 PM CST | Blizzard Watch | FGF | 23 hr |
| Feb 6, 2:37 PM CST | Blizzard Warning | FGF | 39 hr |
| Feb 6, 2:37 PM CST | Winter Weather Advisory | FGF | 51 hr |
| Feb 13, 3:33 AM CST | Winter Weather Advisory | FGF | 30 hr |
| Mar 13, 9:59 PM CDT | Dense Fog Advisory | FGF | 12 hr |
| Mar 14, 10:05 AM CDT | Dense Fog Advisory | FGF | 115 min |
| Apr 1, 3:30 PM CDT | Wind Advisory | FGF | 12 hr |
| Apr 9, 4:01 AM CDT | Wind Advisory | FGF | 14 hr |
| May 3, 5:41 AM CDT | Red Flag Warning | FGF | 14 hr |
| May 5, 12:22 PM CDT | Red Flag Warning | FGF | 9 hr |
| May 13, 4:07 AM CDT | Freeze Warning | FGF | 29 hr |
| May 14, 3:21 PM CDT | Frost Advisory | FGF | 18 hr |
| May 22, 10:08 PM CDT | Special Weather Statement | FGF | 37 min |
| May 26, 11:19 PM CDT | Special Weather Statement | FGF | 26 min |
| May 27, 2:59 PM CDT | Tornado Warning | FGF | 46 min |
| May 27, 3:46 PM CDT | Special Weather Statement | FGF | 59 min |
| May 30, 2:48 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 30, 6:37 PM CDT | Mesoscale Discussion | SPC | 113 min |
| May 30, 8:38 PM CDT | Severe Thunderstorm Warning | FGF | 39 min |
| May 30, 10:03 PM CDT | Special Weather Statement | FGF | 57 min |
| Jun 3, 7:33 PM CDT | Special Weather Statement | FGF | 42 min |
| Jun 6, 1:25 AM CDT | Special Weather Statement | FGF | 65 min |
| Jun 12, 2:30 PM CDT | Mesoscale Discussion | SPC | 90 min |
| Jun 12, 2:50 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 4, 1:34 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 4, 3:00 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 4, 5:35 PM CDT | Mesoscale Discussion | SPC | 85 min |
| Jul 4, 6:38 PM CDT | Severe Thunderstorm Warning | FGF | 52 min |
| Jul 4, 7:28 PM CDT | Severe Thunderstorm Warning | FGF | 47 min |
| Jul 4, 8:13 PM CDT | Severe Thunderstorm Warning | FGF | 47 min |
| Jul 4, 8:29 PM CDT | Mesoscale Discussion | SPC | 91 min |
| Jul 7, 3:10 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 9, 3:21 PM CDT | Mesoscale Discussion | SPC | 84 min |
| Jul 9, 7:30 PM CDT | Severe Thunderstorm Warning | FGF | 60 min |
| Jul 9, 8:31 PM CDT | Severe Thunderstorm Warning | FGF | 44 min |
| Jul 9, 8:32 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 9, 9:08 PM CDT | Severe Thunderstorm Warning | FGF | 52 min |
| Jul 9, 9:30 PM CDT | Severe Thunderstorm Warning | FGF | 45 min |
| Jul 9, 10:13 PM CDT | Severe Thunderstorm Warning | FGF | 62 min |
| Jul 9, 10:44 PM CDT | Mesoscale Discussion | SPC | 91 min |
| Jul 9, 11:09 PM CDT | Severe Thunderstorm Warning | FGF | 66 min |
| Jul 9, 11:13 PM CDT | Severe Thunderstorm Warning | FGF | 62 min |
| Jul 10, 12:11 AM CDT | Severe Thunderstorm Warning | FGF | 64 min |
| Jul 10, 10:16 PM CDT | Mesoscale Discussion | SPC | 89 min |
| Jul 10, 10:40 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 11, 12:13 AM CDT | Severe Thunderstorm Warning | FGF | 47 min |
| Jul 11, 12:58 AM CDT | Severe Thunderstorm Warning | FGF | 47 min |
| Jul 11, 4:06 AM CDT | Mesoscale Discussion | SPC | 84 min |
| Jul 11, 5:08 PM CDT | Flash Flood Warning | FGF | 6 hr |
| Jul 16, 12:27 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 16, 1:09 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 18, 3:17 PM CDT | Excessive Heat Watch | FGF | 36 hr |
| Jul 19, 8:10 PM CDT | Mesoscale Discussion | SPC | 95 min |
| Jul 20, 3:05 AM CDT | Excessive Heat Warning | FGF | 18 hr |
| Jul 20, 8:41 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 20, 11:07 PM CDT | Severe Thunderstorm Warning | FGF | 53 min |
| Jul 20, 11:16 PM CDT | Mesoscale Discussion | SPC | 59 min |
| Jul 20, 11:36 PM CDT | Severe Thunderstorm Warning | FGF | 39 min |
| Jul 21, 12:00 AM CDT | Severe Thunderstorm Warning | FGF | 60 min |
| Jul 21, 12:37 AM CDT | Severe Thunderstorm Warning | FGF | 53 min |
| Jul 23, 9:25 AM CDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 23, 3:54 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 26, 9:38 PM CDT | Severe Thunderstorm Warning | FGF | 33 min |
| Aug 1, 3:19 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Aug 1, 6:42 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 3, 3:38 PM CDT | Tornado Watch | SPC | 7 hr |
| Aug 3, 6:29 PM CDT | Mesoscale Discussion | SPC | 91 min |
| Aug 3, 9:07 PM CDT | Mesoscale Discussion | SPC | 113 min |
| Aug 3, 10:59 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 4, 12:20 AM CDT | Severe Thunderstorm Warning | FGF | 40 min |
| Aug 9, 10:19 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Aug 10, 11:19 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 10, 11:49 AM CDT | Flash Flood Watch | FGF | 16 hr |
| Aug 10, 1:15 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 10, 3:45 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 10, 5:10 PM CDT | Areal Flood Advisory | FGF | 5 hr |
| Aug 10, 8:00 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 10, 10:50 PM CDT | Mesoscale Discussion | SPC | 85 min |
| Aug 18, 6:57 AM CDT | Severe Thunderstorm Warning | FGF | 63 min |
| Aug 18, 7:17 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 18, 7:52 AM CDT | Severe Thunderstorm Warning | FGF | 53 min |
| Aug 27, 1:12 PM CDT | Severe Thunderstorm Warning | FGF | 63 min |
| Aug 27, 1:32 PM CDT | Mesoscale Discussion | SPC | 118 min |
| Aug 27, 4:05 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Aug 27, 5:31 PM CDT | Mesoscale Discussion | SPC | 89 min |
| Aug 27, 6:26 PM CDT | Severe Thunderstorm Warning | FGF | 64 min |
| Aug 27, 7:26 PM CDT | Severe Thunderstorm Warning | FGF | 64 min |
| Aug 28, 5:15 PM CDT | Mesoscale Discussion | SPC | 90 min |
| Sep 7, 2:11 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 7, 3:19 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Sep 7, 3:57 PM CDT | Severe Thunderstorm Warning | FGF | 43 min |
| Sep 7, 4:36 PM CDT | Areal Flood Advisory | FGF | 84 min |
| Sep 7, 5:44 PM CDT | Mesoscale Discussion | SPC | 61 min |
| Sep 16, 4:52 PM CDT | Special Weather Statement | FGF | 53 min |
| Sep 25, 10:15 AM CDT | Wind Advisory | FGF | 9 hr |
| Sep 27, 2:21 PM CDT | Frost Advisory | FGF | 8 hr |
| Oct 6, 3:00 PM CDT | Frost Advisory | FGF | 19 hr |
| Oct 7, 3:00 PM CDT | Freeze Warning | FGF | 19 hr |
| Oct 8, 2:48 PM CDT | Frost Advisory | FGF | 17 hr |
| Nov 16, 4:01 AM CST | Winter Storm Watch | FGF | 33 hr |
| Nov 17, 1:04 PM CST | Winter Weather Advisory | FGF | 29 hr |
| Nov 21, 3:29 PM CST | Winter Weather Advisory | FGF | 28 hr |
| Nov 23, 9:30 PM CST | Dense Fog Advisory | FGF | 12 hr |
| Nov 26, 3:15 PM CST | Dense Fog Advisory | FGF | 27 hr |
| Dec 5, 3:58 AM CST | Winter Weather Advisory | FGF | 65 hr |
| Dec 5, 3:27 PM CST | Blizzard Warning | FGF | 39 hr |
| Dec 5, 4:55 PM CST | Mesoscale Discussion | SPC | 6 hr |
| Dec 9, 2:59 PM CST | Wind Chill Advisory | FGF | 21 hr |
| Dec 12, 3:28 PM CST | Wind Chill Advisory | FGF | 19 hr |
| Dec 13, 2:54 PM CST | Wind Chill Advisory | FGF | 45 hr |
| Dec 16, 4:15 AM CST | Wind Chill Warning | FGF | 56 hr |
| Dec 18, 12:00 PM CST | Wind Chill Advisory | FGF | 3 hr |
| Dec 21, 11:10 AM CST | Wind Advisory | FGF | 6 hr |
| Dec 22, 3:45 PM CST | Winter Storm Watch | FGF | 3 days |
| Dec 23, 3:41 PM CST | Blizzard Warning | FGF | 3 days |
| Dec 24, 2:13 PM CST | Ice Storm Warning | FGF | 34 hr |
| Dec 25, 5:13 PM CST | Mesoscale Discussion | SPC | 6 hr |
| Dec 26, 12:21 AM CST | Winter Weather Advisory | FGF | 19 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 archive20152017
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.