Alert archive / North Dakota / Cass County

Weather alerts in Cass County, North Dakota, 2010

194 weather alerts in 2010, 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 2010. Tap one for its archive.

Alerts: 194
Warnings: 75
Watches: 39
Advisories: 46
Busiest month: July38 alerts
Busiest day: July 27, 201013 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 7 tornado warnings covering Cass County in 2010 had a tornado report inside them; 1 of 2 tornado reports fell inside a warning, on average 30 minutes after it went out.

Cass County, 2010

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	7	2	71%	2	50%	30 min
Severe thunderstorm warnings	31	21	32%	16	88%	27 min
Flash flood warnings	2	2	0%	2	50%	37 min

Each office's whole area, 2010

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Grand Forks, ND: tornado warnings	116	44	62%	112	89%	25 min
NWS Grand Forks, ND: severe thunderstorm warnings	168	101	40%	212	62%	22 min
NWS Grand Forks, ND: flash flood warnings	29	23	21%	39	87%	113 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, 2:53 PM CST	Wind Chill Advisory	FGF	42 hr
Jan 5, 4:07 AM CST	Winter Weather Advisory	FGF	56 hr
Jan 6, 3:39 PM CST	Wind Chill Advisory	FGF	44 hr
Jan 7, 4:35 AM CST	Wind Chill Warning	FGF	31 hr
Jan 7, 4:35 AM CST	Wind Chill Advisory	FGF	11 hr
Jan 8, 3:22 PM CST	Wind Chill Advisory	FGF	23 hr
Jan 18, 7:19 AM CST	Dense Fog Advisory	FGF	5 hr
Jan 18, 12:26 PM CST	Dense Fog Advisory	FGF	3 hr
Jan 18, 3:07 PM CST	Dense Fog Advisory	FGF	19 hr
Jan 20, 2:41 PM CST	Winter Storm Watch	FGF	45 hr
Jan 21, 7:18 PM CST	Freezing Rain Advisory	FGF	9 hr
Jan 22, 4:43 AM CST	Winter Storm Warning	FGF	3 days
Jan 22, 4:43 AM CST	Winter Weather Advisory	FGF	7 hr
Jan 23, 9:49 AM CST	Winter Weather Advisory	FGF	66 hr
Jan 25, 4:19 AM CST	Blizzard Warning	FGF	17 hr
Jan 26, 2:59 PM CST	Wind Chill Advisory	FGF	20 hr
Jan 27, 3:06 PM CST	Wind Chill Advisory	FGF	21 hr
Jan 30, 3:24 PM CST	Wind Chill Advisory	FGF	6 hr
Feb 4, 3:38 AM CST	Winter Weather Advisory	FGF	50 hr
Feb 5, 3:21 PM CST	Winter Storm Watch	FGF	25 hr
Feb 6, 3:52 PM CST	Winter Storm Warning	FGF	47 hr
Feb 6, 3:52 PM CST	Winter Weather Advisory	FGF	50 hr
Feb 12, 3:22 PM CST	Winter Weather Advisory	FGF	48 hr
Feb 23, 3:18 PM CST	Wind Chill Advisory	FGF	19 hr
Mar 5, 11:38 PM CST	Freezing Rain Advisory	FGF	12 hr
Mar 11, 2:25 PM CST	River Flood Watch	FGF	25 hr
Mar 12, 9:13 AM CST	Areal Flood Warning	FGF	6 days
Mar 12, 12:08 PM CST	River Flood Warning	FGF	42 days
Mar 13, 3:53 AM CST	Dense Fog Advisory	FGF	6 hr
Mar 13, 7:14 PM CST	Dense Fog Advisory	FGF	14 hr
Mar 14, 8:30 AM CDT	River Flood Warning	FGF	20 days
Mar 14, 10:22 PM CDT	River Flood Warning	FGF	27 days
Mar 15, 9:04 AM CDT	River Flood Warning	FGF	28 days
Mar 15, 10:28 AM CDT	River Flood Warning	FGF	25 days
Mar 15, 10:28 AM CDT	River Flood Warning	FGF	13 days
Mar 18, 11:48 AM CDT	Areal Flood Warning	FGF	4 days
Mar 22, 11:13 AM CDT	Areal Flood Warning	FGF	7 days
Apr 10, 4:25 AM CDT	Red Flag Warning	FGF	17 hr
Apr 12, 10:29 PM CDT	Mesoscale Discussion	SPC	2 hr
Apr 13, 1:50 AM CDT	Wind Advisory	FGF	20 hr
Apr 13, 10:04 AM CDT	River Flood Warning	FGF	48 hr
Apr 13, 10:04 AM CDT	River Flood Warning	FGF	48 hr
Apr 13, 10:04 AM CDT	River Flood Warning	FGF	48 hr
Apr 13, 10:04 AM CDT	River Flood Warning	FGF	24 hr
Apr 13, 10:04 AM CDT	River Flood Warning	FGF	24 hr
Apr 27, 3:18 PM CDT	Wind Advisory	FGF	30 hr
Apr 27, 3:47 PM CDT	Red Flag Warning	FGF	28 hr
Apr 29, 11:25 PM CDT	Dense Fog Advisory	FGF	10 hr
May 5, 4:31 AM CDT	Wind Advisory	FGF	8 hr
May 8, 3:56 AM CDT	Freeze Warning	FGF	28 hr
May 10, 9:50 AM CDT	River Flood Warning	FGF	9 days
May 22, 8:21 PM CDT	Mesoscale Discussion	SPC	84 min
May 22, 9:01 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
May 22, 11:20 PM CDT	Mesoscale Discussion	SPC	85 min
May 24, 2:00 AM CDT	Severe Thunderstorm Watch	SPC	7 hr
May 24, 3:30 AM CDT	Severe Thunderstorm Warning	FGF	28 min
May 24, 4:21 AM CDT	Mesoscale Discussion	SPC	54 min
May 24, 1:37 PM CDT	Mesoscale Discussion	SPC	53 min
May 24, 2:03 PM CDT	Tornado Watch	SPC	8 hr
May 24, 4:18 PM CDT	Tornado Warning	FGF	42 min
May 24, 5:19 PM CDT	Severe Thunderstorm Warning	FGF	41 min
May 24, 5:44 PM CDT	Severe Thunderstorm Warning	FGF	31 min
May 24, 6:20 PM CDT	Severe Thunderstorm Warning	FGF	40 min
May 24, 7:10 PM CDT	Severe Thunderstorm Warning	FGF	28 min
May 24, 7:21 PM CDT	Mesoscale Discussion	SPC	114 min
May 24, 7:43 PM CDT	Severe Thunderstorm Warning	FGF	47 min
May 24, 9:32 PM CDT	Severe Thunderstorm Watch	SPC	4 hr
May 24, 11:30 PM CDT	Mesoscale Discussion	SPC	90 min
May 25, 8:33 PM CDT	Areal Flood Warning	FGF	17 hr
May 26, 4:18 PM CDT	Areal Flood Warning	FGF	47 hr
May 29, 2:20 PM CDT	Mesoscale Discussion	SPC	25 min
May 29, 3:25 PM CDT	Severe Thunderstorm Watch	SPC	8 hr
May 29, 7:24 PM CDT	Mesoscale Discussion	SPC	96 min
Jun 8, 1:50 PM CDT	Mesoscale Discussion	SPC	55 min
Jun 8, 5:11 PM CDT	Severe Thunderstorm Warning	FGF	64 min
Jun 16, 6:55 PM CDT	High Wind Watch	FGF	16 hr
Jun 17, 7:53 AM CDT	Mesoscale Discussion	SPC	97 min
Jun 17, 8:53 AM CDT	Severe Thunderstorm Warning	FGF	67 min
Jun 17, 9:35 AM CDT	Flash Flood Warning	FGF	12 hr
Jun 17, 12:04 PM CDT	Mesoscale Discussion	SPC	56 min
Jun 17, 12:21 PM CDT	Tornado Watch	SPC	9 hr
Jun 17, 2:18 PM CDT	Mesoscale Discussion	SPC	57 min
Jun 17, 9:47 PM CDT	High Wind Watch	FGF	6 hr
Jun 17, 11:06 PM CDT	Wind Advisory	FGF	20 hr
Jun 21, 1:47 AM CDT	Severe Thunderstorm Warning	FGF	58 min
Jun 21, 4:31 AM CDT	Flash Flood Watch	FGF	26 hr
Jun 21, 5:37 AM CDT	Areal Flood Advisory	FGF	6 hr
Jun 22, 2:13 AM CDT	Severe Thunderstorm Watch	SPC	5 hr
Jun 22, 4:26 AM CDT	Severe Thunderstorm Warning	FGF	64 min
Jun 24, 1:36 PM CDT	Mesoscale Discussion	SPC	84 min
Jun 24, 2:54 PM CDT	Severe Thunderstorm Watch	SPC	5 hr
Jun 25, 3:54 AM CDT	Severe Thunderstorm Warning	FGF	66 min
Jun 25, 4:37 AM CDT	Severe Thunderstorm Warning	FGF	53 min
Jun 26, 3:02 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 26, 5:52 PM CDT	Mesoscale Discussion	SPC	113 min
Jul 3, 2:07 PM CDT	Mesoscale Discussion	SPC	53 min
Jul 3, 5:20 PM CDT	Severe Thunderstorm Watch	SPC	8 hr
Jul 3, 8:18 PM CDT	Mesoscale Discussion	SPC	87 min
Jul 3, 11:48 PM CDT	Mesoscale Discussion	SPC	57 min
Jul 4, 12:48 AM CDT	Areal Flood Advisory	FGF	7 hr
Jul 13, 12:23 PM CDT	Mesoscale Discussion	SPC	97 min
Jul 13, 1:50 PM CDT	Tornado Watch	SPC	9 hr
Jul 13, 4:56 PM CDT	Tornado Warning	FGF	64 min
Jul 13, 5:56 PM CDT	Tornado Warning	FGF	64 min
Jul 13, 6:34 PM CDT	Mesoscale Discussion	SPC	56 min
Jul 13, 6:56 PM CDT	Tornado Warning	FGF	64 min
Jul 13, 7:19 PM CDT	Tornado Warning	FGF	56 min
Jul 13, 10:58 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 14, 1:02 AM CDT	Tornado Watch	SPC	6 hr
Jul 14, 3:00 AM CDT	Mesoscale Discussion	SPC	90 min
Jul 14, 3:50 AM CDT	Severe Thunderstorm Warning	FGF	55 min
Jul 14, 3:50 AM CDT	Tornado Watch	SPC	5 hr
Jul 14, 4:29 AM CDT	Severe Thunderstorm Warning	FGF	61 min
Jul 14, 4:56 AM CDT	Severe Thunderstorm Warning	FGF	64 min
Jul 14, 5:37 AM CDT	Severe Thunderstorm Warning	FGF	53 min
Jul 17, 12:28 PM CDT	Tornado Watch	SPC	11 hr
Jul 17, 4:18 PM CDT	Severe Thunderstorm Warning	FGF	57 min
Jul 17, 5:10 PM CDT	Severe Thunderstorm Warning	FGF	65 min
Jul 17, 6:07 PM CDT	Severe Thunderstorm Warning	FGF	53 min
Jul 21, 12:30 AM CDT	Severe Thunderstorm Warning	FGF	45 min
Jul 26, 10:12 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 27, 12:07 AM CDT	Severe Thunderstorm Warning	FGF	53 min
Jul 27, 12:30 AM CDT	Tornado Warning	FGF	60 min
Jul 27, 12:44 AM CDT	Severe Thunderstorm Warning	FGF	61 min
Jul 27, 1:05 AM CDT	Tornado Warning	FGF	55 min
Jul 27, 1:05 AM CDT	Mesoscale Discussion	SPC	55 min
Jul 27, 1:24 AM CDT	Severe Thunderstorm Watch	SPC	8 hr
Jul 27, 1:43 AM CDT	Severe Thunderstorm Warning	FGF	62 min
Jul 27, 3:41 AM CDT	Severe Thunderstorm Warning	FGF	64 min
Jul 27, 3:50 AM CDT	Mesoscale Discussion	SPC	85 min
Jul 27, 4:34 AM CDT	Severe Thunderstorm Warning	FGF	56 min
Jul 27, 5:06 AM CDT	Severe Thunderstorm Warning	FGF	54 min
Jul 27, 7:01 AM CDT	Mesoscale Discussion	SPC	89 min
Aug 7, 3:10 PM CDT	Mesoscale Discussion	SPC	2 hr
Aug 7, 5:27 PM CDT	Tornado Watch	SPC	8 hr
Aug 7, 8:57 PM CDT	Mesoscale Discussion	SPC	93 min
Aug 10, 2:01 PM CDT	Mesoscale Discussion	SPC	89 min
Aug 12, 12:42 AM CDT	Severe Thunderstorm Watch	SPC	5 hr
Aug 12, 2:40 AM CDT	Mesoscale Discussion	SPC	2 hr
Aug 12, 3:28 AM CDT	Severe Thunderstorm Warning	FGF	47 min
Aug 12, 1:40 PM CDT	Severe Thunderstorm Warning	FGF	42 min
Aug 12, 1:51 PM CDT	Areal Flood Advisory	FGF	114 min
Aug 12, 3:11 PM CDT	Flash Flood Warning	FGF	16 hr
Aug 12, 8:50 PM CDT	Severe Thunderstorm Warning	FGF	55 min
Aug 12, 10:34 PM CDT	Severe Thunderstorm Warning	FGF	56 min
Aug 13, 1:08 AM CDT	Mesoscale Discussion	SPC	67 min
Aug 13, 1:25 AM CDT	Severe Thunderstorm Warning	FGF	65 min
Aug 13, 1:33 AM CDT	Severe Thunderstorm Watch	SPC	4 hr
Aug 18, 9:24 AM CDT	Special Weather Statement	FGF	51 min
Aug 21, 8:39 AM CDT	Dense Fog Advisory	FGF	2 hr
Aug 21, 9:14 PM CDT	Wind Advisory	FGF	24 hr
Aug 23, 11:13 AM CDT	Wind Advisory	FGF	4 hr
Aug 30, 3:35 PM CDT	Mesoscale Discussion	SPC	55 min
Aug 30, 3:53 PM CDT	Tornado Watch	SPC	6 hr
Aug 30, 5:57 PM CDT	Mesoscale Discussion	SPC	93 min
Sep 2, 3:13 AM CDT	Wind Advisory	FGF	16 hr
Sep 6, 10:12 AM CDT	River Flood Watch	FGF	23 hr
Sep 9, 2:47 PM CDT	Flood Watch	FGF	19 hr
Sep 17, 3:51 PM CDT	Frost Advisory	FGF	16 hr
Sep 22, 3:15 PM CDT	Flood Watch	FGF	5 hr
Sep 22, 8:28 PM CDT	Flood Watch	FGF	17 hr
Sep 28, 5:33 AM CDT	Dense Fog Advisory	FGF	6 hr
Oct 1, 2:43 PM CDT	Frost Advisory	FGF	18 hr
Oct 20, 4:22 AM CDT	Wind Advisory	FGF	14 hr
Oct 25, 10:18 AM CDT	High Wind Watch	FGF	18 hr
Oct 25, 2:58 PM CDT	High Wind Warning	FGF	43 hr
Oct 25, 3:10 PM CDT	Winter Storm Watch	FGF	23 hr
Oct 26, 2:35 PM CDT	Winter Storm Warning	FGF	24 hr
Oct 27, 10:39 AM CDT	River Flood Warning	FGF	8 days
Oct 27, 2:31 PM CDT	Wind Advisory	FGF	10 hr
Nov 21, 3:19 PM CST	Winter Weather Advisory	FGF	32 hr
Nov 22, 1:56 AM CST	Mesoscale Discussion	SPC	4 hr
Nov 22, 4:17 AM CST	Winter Storm Watch	FGF	35 hr
Nov 22, 7:23 AM CST	Winter Storm Warning	FGF	16 hr
Nov 23, 3:15 PM CST	Blizzard Watch	FGF	24 hr
Nov 23, 3:15 PM CST	Winter Weather Advisory	FGF	44 hr
Nov 29, 4:39 AM CST	Winter Storm Warning	FGF	31 hr
Nov 29, 4:39 AM CST	Winter Weather Advisory	FGF	40 hr
Dec 2, 3:24 PM CST	Winter Weather Advisory	FGF	37 hr
Dec 10, 4:17 AM CST	Winter Weather Advisory	FGF	29 hr
Dec 10, 4:09 PM CST	Winter Storm Warning	FGF	12 hr
Dec 11, 3:18 PM CST	Wind Chill Advisory	FGF	13 hr
Dec 14, 3:13 PM CST	Winter Weather Advisory	FGF	42 hr
Dec 15, 12:54 PM CST	Winter Storm Warning	FGF	20 hr
Dec 19, 4:13 AM CST	Winter Storm Watch	FGF	24 hr
Dec 19, 2:46 PM CST	Winter Storm Warning	FGF	39 hr
Dec 28, 5:19 AM CST	Winter Storm Watch	FGF	35 hr
Dec 29, 3:50 PM CST	Winter Storm Watch	FGF	37 hr
Dec 29, 3:50 PM CST	Winter Storm Warning	FGF	36 hr
Dec 29, 3:50 PM CST	Winter Weather Advisory	FGF	50 hr
Dec 30, 4:05 AM CST	Blizzard Watch	FGF	24 hr
Dec 30, 12:16 PM CST	Blizzard Warning	FGF	16 hr
Dec 31, 4:20 AM CST	Blizzard Warning	FGF	32 hr
Dec 31, 5:05 PM 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	31
Tornado Warning	7
Severe Thunderstorm Watch	13
Tornado Watch	8
Mesoscale Discussion	33
Special Weather Statement	1
Flooding
Areal Flood Warning	5
Flash Flood Warning	2
River Flood Warning	13
Flash Flood Watch	1
Flood Watch	3
River Flood Watch	2
Areal Flood Advisory	3
Winter
Blizzard Warning	3
Winter Storm Warning	9
Blizzard Watch	2
Winter Storm Watch	7
Freezing Rain Advisory	2
Winter Weather Advisory	13
Cold
Freeze Warning	1
Wind Chill Warning	1
Frost Advisory	2
Wind Chill Advisory	9
Wind and dust
High Wind Warning	1
High Wind Watch	3
Wind Advisory	9
Fire
Red Flag Warning	2
Fog and smoke
Dense Fog Advisory	8

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2009 2011

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.