Alert archive / North Dakota / Cass County

Weather alerts in Cass County, North Dakota, 2025

183 weather alerts in 2025, 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 2025. Tap one for its archive.

Alerts: 183
Warnings: 64
Watches: 30
Advisories: 54
Busiest month: June47 alerts
Busiest day: June 21, 202522 alerts

Over time

By month

Warning verification

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

4 of 5 tornado warnings covering Cass County in 2025 had a tornado report inside them; 2 of 2 tornado reports fell inside a warning, on average 15 minutes after it went out.

Cass County, 2025

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	5	4	20%	2	100%	15 min
Severe thunderstorm warnings	32	24	25%	26	81%	23 min
Flash flood warnings	4	2	50%	4	100%	48 min

Each office's whole area, 2025

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Grand Forks, ND: tornado warnings	52	23	56%	48	63%	19 min
NWS Grand Forks, ND: severe thunderstorm warnings	191	118	38%	280	78%	26 min
NWS Grand Forks, ND: flash flood warnings	13	7	46%	13	92%	31 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 4, 1:32 PM CST	Cold Weather Advisory	FGF	20 hr
Jan 11, 3:07 AM CST	Winter Weather Advisory	FGF	36 hr
Jan 12, 1:35 PM CST	Cold Weather Advisory	FGF	22 hr
Jan 13, 12:19 PM CST	Cold Weather Advisory	FGF	24 hr
Jan 16, 1:58 PM CST	Winter Weather Advisory	FGF	30 hr
Jan 17, 9:58 AM CST	High Wind Warning	FGF	8 hr
Jan 17, 2:00 PM CST	Cold Weather Advisory	FGF	28 hr
Jan 17, 2:00 PM CST	Extreme Cold Warning	FGF	4 days
Jan 28, 2:13 AM CST	Wind Advisory	FGF	16 hr
Feb 2, 3:19 AM CST	Winter Weather Advisory	FGF	31 hr
Feb 5, 3:52 AM CST	Winter Weather Advisory	FGF	36 hr
Feb 7, 1:13 PM CST	Winter Weather Advisory	FGF	17 hr
Feb 10, 3:00 AM CST	Cold Weather Advisory	FGF	33 hr
Feb 11, 2:11 PM CST	Cold Weather Advisory	FGF	21 hr
Feb 12, 12:26 PM CST	Cold Weather Advisory	FGF	24 hr
Feb 14, 1:31 PM CST	Cold Weather Advisory	FGF	20 hr
Feb 15, 2:45 AM CST	Extreme Cold Watch	FGF	23 hr
Feb 16, 1:53 AM CST	Extreme Cold Warning	FGF	58 hr
Feb 18, 2:44 AM CST	Extreme Cold Warning	FGF	31 hr
Feb 26, 2:48 PM CST	High Wind Watch	FGF	22 hr
Feb 27, 12:50 PM CST	High Wind Warning	FGF	23 hr
Feb 27, 12:50 PM CST	Wind Advisory	FGF	28 hr
Mar 4, 3:04 AM CST	Wind Advisory	FGF	21 hr
Mar 8, 3:59 AM CST	Fire Weather Watch	FGF	22 hr
Mar 8, 1:33 PM CST	High Wind Watch	FGF	24 hr
Mar 9, 3:01 AM CDT	Red Flag Warning	FGF	40 hr
Mar 9, 2:48 PM CDT	High Wind Warning	FGF	27 hr
Mar 13, 3:00 PM CDT	Winter Storm Watch	FGF	23 hr
Mar 14, 2:01 PM CDT	High Wind Warning	FGF	24 hr
Mar 14, 2:01 PM CDT	Wind Advisory	FGF	29 hr
Mar 14, 2:07 PM CDT	Winter Weather Advisory	FGF	23 hr
Mar 19, 2:11 PM CDT	Fire Weather Watch	FGF	13 hr
Mar 20, 2:44 AM CDT	Red Flag Warning	FGF	16 hr
Mar 22, 2:23 PM CDT	Wind Advisory	FGF	24 hr
Mar 30, 2:33 PM CDT	Winter Storm Watch	FGF	37 hr
Apr 1, 3:14 AM CDT	Winter Storm Warning	FGF	40 hr
Apr 2, 6:57 PM CDT	Winter Storm Warning	FGF	11 hr
Apr 11, 12:45 AM CDT	Dense Fog Advisory	FGF	8 hr
Apr 28, 2:29 AM CDT	Wind Advisory	FGF	22 hr
May 5, 2:48 AM CDT	Red Flag Warning	FGF	18 hr
May 8, 2:53 PM CDT	Fire Weather Watch	FGF	47 hr
May 10, 1:47 PM CDT	Fire Weather Watch	FGF	24 hr
May 10, 1:47 PM CDT	Red Flag Warning	FGF	55 hr
May 11, 3:05 AM CDT	Wind Advisory	FGF	18 hr
May 12, 2:55 AM CDT	Wind Advisory	FGF	17 hr
May 12, 2:46 PM CDT	Fire Weather Watch	FGF	12 hr
May 13, 2:56 AM CDT	Wind Advisory	FGF	16 hr
May 13, 3:13 AM CDT	Red Flag Warning	FGF	18 hr
May 13, 3:18 PM CDT	Fire Weather Watch	FGF	12 hr
May 15, 1:35 PM CDT	Wind Advisory	FGF	35 hr
May 17, 1:56 PM CDT	Frost Advisory	FGF	18 hr
May 19, 3:11 AM CDT	Wind Advisory	FGF	19 hr
May 21, 10:37 AM CDT	River Flood Warning	FGF	5 days
Jun 7, 3:02 PM CDT	Mesoscale Discussion	SPC	118 min
Jun 7, 4:53 PM CDT	Severe Thunderstorm Warning	FGF	52 min
Jun 7, 4:59 PM CDT	Special Weather Statement	FGF	46 min
Jun 16, 5:45 AM CDT	Special Weather Statement	FGF	45 min
Jun 16, 6:16 AM CDT	Severe Thunderstorm Warning	FGF	44 min
Jun 19, 7:30 PM CDT	Severe Thunderstorm Warning	FGF	45 min
Jun 19, 8:09 PM CDT	Mesoscale Discussion	SPC	2 hr
Jun 19, 9:11 PM CDT	Severe Thunderstorm Watch	SPC	9 hr
Jun 19, 10:53 PM CDT	Mesoscale Discussion	SPC	2 hr
Jun 20, 7:08 PM CDT	Mesoscale Discussion	SPC	3 hr
Jun 20, 7:54 PM CDT	Tornado Watch	SPC	7 hr
Jun 20, 8:15 PM CDT	Mesoscale Discussion	SPC	2 hr
Jun 20, 9:56 PM CDT	Tornado Warning Tornado observedConsiderable damage threat	FGF	49 min
Jun 20, 10:08 PM CDT	Mesoscale Discussion	SPC	97 min
Jun 20, 10:41 PM CDT	Severe Thunderstorm Warning Destructive damage threat	FGF	64 min
Jun 20, 10:42 PM CDT	Tornado Warning	FGF	48 min
Jun 20, 11:17 PM CDT	Severe Thunderstorm Warning Destructive damage threat	FGF	43 min
Jun 20, 11:20 PM CDT	Tornado Warning	FGF	25 min
Jun 20, 11:24 PM CDT	Severe Thunderstorm Warning Destructive damage threat	FGF	36 min
Jun 20, 11:25 PM CDT	Tornado Warning	FGF	35 min
Jun 20, 11:39 PM CDT	Mesoscale Discussion	SPC	66 min
Jun 20, 11:49 PM CDT	Severe Thunderstorm Warning Destructive damage threat	FGF	56 min
Jun 20, 11:49 PM CDT	Tornado Warning Tornado observedConsiderable damage threat	FGF	11 min
Jun 20, 11:52 PM CDT	Severe Thunderstorm Warning Considerable damage threat	FGF	53 min
Jun 21, 12:16 AM CDT	Severe Thunderstorm Warning Destructive damage threat	FGF	59 min
Jun 21, 12:32 AM CDT	Flash Flood Warning	FGF	3 hr
Jun 21, 12:51 AM CDT	Severe Thunderstorm Warning Destructive damage threat	FGF	54 min
Jun 21, 1:07 AM CDT	Severe Thunderstorm Warning Destructive damage threat	FGF	53 min
Jun 21, 1:12 AM CDT	Severe Thunderstorm Warning Destructive damage threat	FGF	48 min
Jun 21, 1:43 AM CDT	Severe Thunderstorm Warning Destructive damage threat	FGF	62 min
Jun 21, 1:56 AM CDT	Severe Thunderstorm Warning Considerable damage threat	FGF	34 min
Jun 22, 7:24 AM CDT	Mesoscale Discussion	SPC	96 min
Jun 22, 9:09 AM CDT	Severe Thunderstorm Watch	SPC	3 hr
Jun 22, 2:34 PM CDT	Mesoscale Discussion	SPC	116 min
Jun 22, 2:58 PM CDT	Tornado Watch	SPC	8 hr
Jun 28, 12:47 AM CDT	Mesoscale Discussion	SPC	58 min
Jun 28, 1:51 PM CDT	Mesoscale Discussion	SPC	84 min
Jun 28, 4:49 PM CDT	Mesoscale Discussion	SPC	86 min
Jun 28, 5:07 PM CDT	Severe Thunderstorm Warning	FGF	38 min
Jun 28, 5:21 PM CDT	Severe Thunderstorm Watch	SPC	4 hr
Jun 28, 5:39 PM CDT	Severe Thunderstorm Warning Considerable damage threat	FGF	47 min
Jun 28, 6:21 PM CDT	Severe Thunderstorm Warning	FGF	54 min
Jun 28, 6:51 PM CDT	Severe Thunderstorm Warning	FGF	29 min
Jun 28, 6:58 PM CDT	Flash Flood Warning	FGF	6 hr
Jun 28, 7:03 PM CDT	Severe Thunderstorm Warning	FGF	23 min
Jun 28, 7:16 PM CDT	Severe Thunderstorm Warning	FGF	59 min
Jun 29, 12:00 PM CDT	River Flood Warning	FGF	3 days
Jul 3, 12:05 PM CDT	Heat Advisory	FGF	31 hr
Jul 4, 11:17 AM CDT	Flood Watch	FGF	11 hr
Jul 4, 1:10 PM CDT	Mesoscale Discussion	SPC	3 hr
Jul 4, 2:03 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 4, 3:43 PM CDT	Severe Thunderstorm Warning	FGF	47 min
Jul 4, 4:18 PM CDT	Special Weather Statement	FGF	27 min
Jul 4, 4:29 PM CDT	Severe Thunderstorm Warning	FGF	50 min
Jul 4, 5:09 PM CDT	Mesoscale Discussion	SPC	2 hr
Jul 4, 9:05 PM CDT	River Flood Watch	FGF	11 hr
Jul 7, 2:55 PM CDT	Mesoscale Discussion	SPC	2 hr
Jul 7, 3:26 PM CDT	Severe Thunderstorm Watch	SPC	8 hr
Jul 7, 4:55 PM CDT	Severe Thunderstorm Warning	FGF	65 min
Jul 7, 5:32 PM CDT	Severe Thunderstorm Warning	FGF	32 min
Jul 9, 11:18 PM CDT	Mesoscale Discussion	SPC	117 min
Jul 14, 11:28 PM CDT	Severe Thunderstorm Watch	SPC	5 hr
Jul 21, 10:11 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 22, 3:19 PM CDT	Mesoscale Discussion	SPC	116 min
Jul 23, 4:54 AM CDT	Flood Watch	FGF	10 hr
Jul 24, 2:14 PM CDT	Special Weather Statement	FGF	31 min
Jul 25, 2:17 PM CDT	Heat Advisory	FGF	30 hr
Jul 26, 2:17 AM CDT	Severe Thunderstorm Warning	FGF	41 min
Jul 26, 2:56 AM CDT	Severe Thunderstorm Warning	FGF	64 min
Jul 26, 4:51 AM CDT	Special Weather Statement	FGF	24 min
Jul 26, 2:10 PM CDT	Heat Advisory	FGF	30 hr
Jul 26, 3:50 PM CDT	Mesoscale Discussion	SPC	2 hr
Jul 26, 10:59 PM CDT	Mesoscale Discussion	SPC	2 hr
Jul 26, 11:48 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 27, 12:29 AM CDT	Severe Thunderstorm Warning	FGF	61 min
Jul 27, 1:09 AM CDT	Mesoscale Discussion	SPC	96 min
Jul 27, 1:12 AM CDT	Severe Thunderstorm Warning Considerable damage threat	FGF	63 min
Aug 5, 7:58 PM CDT	Flash Flood Warning	FGF	5 hr
Aug 5, 8:28 PM CDT	Areal Flood Advisory	FGF	53 min
Aug 5, 9:21 PM CDT	Flash Flood Warning	FGF	5 hr
Aug 6, 11:17 AM CDT	River Flood Warning	FGF	58 hr
Aug 6, 11:17 AM CDT	River Flood Warning	FGF	33 hr
Aug 7, 11:57 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Aug 8, 2:41 AM CDT	Severe Thunderstorm Warning Considerable damage threat	FGF	64 min
Aug 8, 3:23 AM CDT	Severe Thunderstorm Warning Considerable damage threat	FGF	37 min
Aug 8, 3:55 AM CDT	Severe Thunderstorm Warning Considerable damage threat	FGF	65 min
Aug 8, 4:31 AM CDT	Mesoscale Discussion	SPC	89 min
Aug 8, 9:37 PM CDT	River Flood Warning	FGF	61 hr
Aug 11, 4:38 PM CDT	Mesoscale Discussion	SPC	2 hr
Aug 11, 5:12 PM CDT	Special Weather Statement	FGF	33 min
Aug 14, 8:49 PM CDT	Mesoscale Discussion	SPC	116 min
Aug 15, 8:17 AM CDT	Special Weather Statement	FGF	28 min
Aug 17, 11:17 AM CDT	River Flood Watch	FGF	21 days
Aug 18, 7:07 PM CDT	Special Weather Statement	FGF	23 min
Aug 18, 7:28 PM CDT	Special Weather Statement	FGF	62 min
Aug 29, 4:44 PM CDT	Areal Flood Advisory	FGF	3 hr
Aug 29, 5:33 PM CDT	Areal Flood Advisory	FGF	117 min
Aug 31, 3:16 AM CDT	Dense Fog Advisory	FGF	9 hr
Sep 6, 2:15 PM CDT	Frost Advisory	FGF	18 hr
Sep 9, 3:17 AM CDT	Dense Fog Advisory	FGF	7 hr
Sep 9, 7:04 PM CDT	Dense Fog Advisory	FGF	16 hr
Sep 14, 4:41 PM CDT	Severe Thunderstorm Warning	FGF	64 min
Sep 14, 5:22 PM CDT	Special Weather Statement	FGF	38 min
Sep 24, 3:08 AM CDT	Dense Fog Advisory	FGF	9 hr
Oct 5, 2:41 AM CDT	Wind Advisory	FGF	16 hr
Oct 5, 2:57 PM CDT	Frost Advisory	FGF	18 hr
Oct 11, 2:55 PM CDT	Wind Advisory	FGF	29 hr
Oct 25, 2:13 PM CDT	Wind Advisory	FGF	28 hr
Nov 23, 2:10 PM CST	Winter Storm Watch	FGF	24 hr
Nov 24, 2:04 PM CST	Winter Weather Advisory	FGF	34 hr
Dec 7, 2:06 PM CST	Winter Storm Watch	FGF	24 hr
Dec 8, 1:46 PM CST	High Wind Warning	FGF	35 hr
Dec 8, 1:46 PM CST	Winter Weather Advisory	FGF	37 hr
Dec 9, 9:02 AM CST	Mesoscale Discussion	SPC	3 hr
Dec 11, 1:56 PM CST	Cold Weather Advisory	FGF	70 hr
Dec 11, 1:56 PM CST	Winter Weather Advisory	FGF	25 hr
Dec 15, 1:37 PM CST	Wind Advisory	FGF	28 hr
Dec 16, 1:45 PM CST	High Wind Warning	FGF	4 hr
Dec 16, 2:06 PM CST	Winter Storm Watch	FGF	23 hr
Dec 17, 12:56 PM CST	Blizzard Warning	FGF	29 hr
Dec 18, 9:09 AM CST	Mesoscale Discussion	SPC	5 hr
Dec 25, 2:56 AM CST	Winter Weather Advisory	FGF	24 hr
Dec 26, 4:51 PM CST	Dense Fog Advisory	FGF	31 hr
Dec 26, 6:09 PM CST	Winter Weather Advisory	FGF	18 hr
Dec 27, 1:37 PM CST	Winter Storm Watch	FGF	10 hr
Dec 27, 6:39 PM CST	Winter Weather Advisory	FGF	38 hr
Dec 27, 11:20 PM CST	Blizzard Warning	FGF	28 hr
Dec 28, 2:02 PM CST	Cold Weather Advisory	FGF	19 hr
Dec 30, 8:44 AM CST	Winter Weather Advisory	FGF	6 hr
Dec 30, 8:05 PM CST	Winter Weather Advisory	FGF	13 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	32
Tornado Warning	5
Severe Thunderstorm Watch	9
Tornado Watch	2
Mesoscale Discussion	25
Special Weather Statement	10
Flooding
Flash Flood Warning	4
River Flood Warning	5
Flood Watch	2
River Flood Watch	2
Areal Flood Advisory	3
Winter
Blizzard Warning	2
Winter Storm Warning	2
Winter Storm Watch	6
Winter Weather Advisory	14
Heat
Heat Advisory	3
Cold
Extreme Cold Warning	3
Extreme Cold Watch	1
Cold Weather Advisory	10
Frost Advisory	3
Wind and dust
High Wind Warning	6
High Wind Watch	2
Wind Advisory	15
Fire
Red Flag Warning	5
Fire Weather Watch	6
Fog and smoke
Dense Fog Advisory	6

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2024 2026

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.