Alert archive / North Dakota / Cass County

Weather alerts in Cass County, North Dakota, 2008

176 weather alerts in 2008, 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 2008. Tap one for its archive.

Alerts: 176
Warnings: 64
Watches: 24
Advisories: 58
Busiest month: June31 alerts
Busiest day: June 14, 20088 alerts

Over time

By month

Warning verification

How often warnings here had a storm report inside them, and how much warning the reports had.

2 of 3 tornado warnings covering Cass County in 2008 had a tornado report inside them; 1 of 1 tornado reports fell inside a warning, on average 5 minutes after it went out.

Cass County, 2008

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	3	2	33%	1	100%	5 min
Severe thunderstorm warnings	29	21	28%	25	88%	32 min
Flash flood warnings	1	1	0%	2	100%	2 min

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 10, 3:22 AM CST	Dense Fog Advisory	FGF	6 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	Winter Weather 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, 9:39 AM CST	Mesoscale Discussion	SPC	6 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 24, 5:43 AM CST	Dense Fog Advisory	FGF	4 hr
Feb 24, 3:45 PM CST	Dense Fog Advisory	FGF	11 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 20, 3:15 PM CDT	Snow Advisory	FGF	22 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 9, 3:27 PM CDT	Winter Storm Watch	FGF	23 hr
Apr 10, 10:21 AM CDT	River Flood Watch	FGF	4 days
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 21, 9:31 AM CDT	Severe Thunderstorm Warning	FGF	44 min
Apr 25, 11:53 AM CDT	Winter Weather Advisory	FGF	24 hr
Apr 26, 11:36 AM CDT	Wind Advisory	FGF	7 hr
May 1, 7:00 PM CDT	River Flood Warning	FGF	5 days
May 2, 4:15 AM CDT	Wind Advisory	FGF	17 hr
May 16, 4:19 AM CDT	Wind Advisory	FGF	17 hr
May 16, 3:54 PM CDT	Fire Weather Watch	FGF	12 hr
May 17, 3:44 AM CDT	Wind Advisory	FGF	17 hr
May 17, 3:54 AM CDT	Red Flag Warning	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, 7:59 PM CDT	Tornado Warning	FGF	61 min
May 24, 8:07 PM CDT	Tornado Watch	SPC	3 hr
May 24, 8:25 PM CDT	Severe Thunderstorm Warning	FGF	46 min
May 24, 8:45 PM CDT	Severe Thunderstorm Warning	FGF	60 min
May 24, 9:26 PM CDT	Mesoscale Discussion	SPC	2 hr
May 26, 3:12 PM CDT	Freeze Warning	FGF	16 hr
Jun 5, 5:12 AM CDT	Flash Flood Watch	FGF	22 hr
Jun 7, 11:09 AM CDT	River Flood Warning	FGF	9 days
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, 12:51 PM CDT	Flash Flood Watch	FGF	6 hr
Jun 11, 1:24 PM CDT	Severe Thunderstorm Warning	FGF	66 min
Jun 11, 1:44 PM CDT	High Wind Warning	FGF	5 hr
Jun 11, 2:22 PM CDT	Severe Thunderstorm Warning	FGF	53 min
Jun 11, 3:08 PM CDT	Flash Flood Warning	FGF	5 hr
Jun 12, 9:47 AM CDT	River Flood Warning	FGF	34 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, 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, 4:31 PM CDT	Severe Thunderstorm Warning	FGF	59 min
Jun 14, 4:55 PM CDT	Severe Thunderstorm Warning	FGF	35 min
Jun 14, 4:58 PM CDT	Severe Thunderstorm Warning	FGF	62 min
Jun 14, 5:30 PM CDT	Areal Flood Advisory	FGF	30 min
Jun 14, 6:04 PM CDT	Mesoscale Discussion	SPC	86 min
Jun 14, 6:52 PM CDT	Severe Thunderstorm Warning	FGF	53 min
Jun 14, 7:32 PM CDT	Severe Thunderstorm Warning	FGF	58 min
Jun 14, 7:34 PM CDT	Tornado Warning	FGF	41 min
Jun 14, 7:42 PM CDT	Severe Thunderstorm Warning	FGF	33 min
Jun 14, 8:16 PM CDT	Tornado Warning	FGF	40 min
Jun 14, 8:24 PM CDT	Severe Thunderstorm Warning	FGF	36 min
Jun 24, 9:52 PM CDT	Severe Thunderstorm Warning	FGF	53 min
Jun 24, 10:39 PM CDT	Severe Thunderstorm Warning	FGF	36 min
Jun 26, 6:28 PM CDT	Mesoscale Discussion	SPC	62 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 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, 11:01 AM CDT	Severe Thunderstorm Warning	FGF	26 min
Jul 7, 11:17 AM CDT	Severe Thunderstorm Warning	FGF	26 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, 5:30 PM CDT	Tornado Watch	SPC	3 hr
Jul 7, 6:01 PM CDT	Severe Thunderstorm Warning	FGF	59 min
Jul 7, 6:49 PM CDT	Severe Thunderstorm Warning	FGF	56 min
Jul 7, 7:00 PM CDT	Severe Thunderstorm Warning	FGF	60 min
Jul 9, 3:34 PM CDT	Mesoscale Discussion	SPC	86 min
Jul 10, 6:59 AM CDT	Severe Thunderstorm Warning	FGF	61 min
Jul 10, 7:41 AM CDT	Mesoscale Discussion	SPC	64 min
Jul 10, 7:58 AM CDT	Severe Thunderstorm Watch	SPC	5 hr
Jul 10, 6:03 PM CDT	Mesoscale Discussion	SPC	57 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, 5:50 PM CDT	Mesoscale Discussion	SPC	85 min
Jul 12, 4:20 AM CDT	Wind Advisory	FGF	18 hr
Jul 16, 3:34 AM CDT	Mesoscale Discussion	SPC	56 min
Jul 16, 6:07 PM CDT	Mesoscale Discussion	SPC	113 min
Jul 20, 1:52 AM CDT	Mesoscale Discussion	SPC	83 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 2, 3:58 PM CDT	Severe Thunderstorm Warning	FGF	42 min
Aug 2, 4:04 PM CDT	Severe Thunderstorm Warning	FGF	56 min
Aug 2, 4:58 PM CDT	Severe Thunderstorm Warning	FGF	30 min
Aug 13, 10:28 AM CDT	River Flood Warning	FGF	71 hr
Aug 14, 3:53 PM CDT	Severe Thunderstorm Warning	FGF	28 min
Aug 14, 4:45 PM CDT	Mesoscale Discussion	SPC	90 min
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 26, 10:16 PM CDT	Severe Thunderstorm Warning	FGF	45 min
Aug 27, 12:21 AM CDT	Severe Thunderstorm Warning	FGF	42 min
Aug 31, 3:29 AM CDT	Wind Advisory	FGF	17 hr
Sep 1, 2:18 PM CDT	Mesoscale Discussion	SPC	87 min
Sep 1, 5:58 PM CDT	Areal Flood Advisory	FGF	13 hr
Sep 10, 3:00 PM CDT	Areal Flood Advisory	FGF	16 hr
Sep 12, 4:13 AM CDT	Dense Fog Advisory	FGF	6 hr
Sep 25, 3:48 AM CDT	Mesoscale Discussion	SPC	87 min
Sep 29, 8:44 PM CDT	Frost Advisory	FGF	10 hr
Oct 11, 10:12 AM CDT	River Flood Warning	FGF	10 days
Oct 11, 10:12 AM CDT	River Flood Warning	FGF	7 days
Oct 12, 10:30 AM CDT	River Flood Warning	FGF	4 days
Oct 13, 11:42 AM CDT	River Flood Warning	FGF	23 hr
Oct 13, 3:20 PM CDT	Frost Advisory	FGF	18 hr
Oct 24, 9:46 PM CDT	River Flood Warning	FGF	36 hr
Oct 25, 4:13 AM CDT	Wind Advisory	FGF	39 hr
Oct 25, 10:11 AM CDT	River Flood Warning	FGF	5 days
Oct 26, 4:52 AM CDT	High Wind Warning	FGF	14 hr
Nov 4, 1:38 PM CST	Flood Watch	FGF	52 hr
Nov 5, 2:51 PM CST	Mesoscale Discussion	SPC	114 min
Nov 5, 5:01 PM CST	Severe Thunderstorm Warning	FGF	59 min
Nov 5, 8:48 PM CST	River Flood Warning	FGF	61 hr
Nov 5, 8:48 PM CST	River Flood Warning	FGF	4 days
Nov 5, 8:48 PM CST	River Flood Warning	FGF	61 hr
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 19, 11:21 PM CST	Mesoscale Discussion	SPC	4 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 29, 10:51 AM CST	Winter Storm Warning	FGF	28 hr
Dec 29, 10:51 AM CST	Winter Weather Advisory	FGF	28 hr
Dec 30, 12:49 AM CST	Mesoscale Discussion	SPC	4 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	29
Tornado Warning	3
Severe Thunderstorm Watch	6
Tornado Watch	5
Mesoscale Discussion	30
Flooding
Flash Flood Warning	1
River Flood Warning	13
Flash Flood Watch	2
Flood Watch	1
River Flood Watch	1
Areal Flood Advisory	3
Winter
Blizzard Warning	2
Winter Storm Warning	5
Blizzard Watch	2
Winter Storm Watch	6
Freezing Rain Advisory	1
Snow Advisory	1
Snow and Blowing Snow Advisory	1
Winter Weather Advisory	14
Cold
Freeze Warning	1
Wind Chill Warning	6
Frost Advisory	3
Wind Chill Advisory	11
Wind and dust
High Wind Warning	3
Wind Advisory	20
Fire
Red Flag Warning	1
Fire Weather Watch	1
Fog and smoke
Dense Fog Advisory	4

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2007 2009

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.