Weather alerts in Cass County, Minnesota, 2008

151 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: 151
Warnings: 56
Watches: 23
Advisories: 37
Busiest month: July31 alerts
Busiest day: September 26, 200811 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 5 tornado warnings covering Cass County in 2008 had a tornado report inside them.

Cass County, 2008

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	5	0	100%	0
Severe thunderstorm warnings	38	9	76%	10	80%	28 min
Flash flood warnings	1	0	100%	0

Each office's whole area, 2008

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Duluth, MN: tornado warnings	19	1	95%	3	33%	13 min
NWS Duluth, MN: severe thunderstorm warnings	249	43	83%	110	64%	25 min
NWS Duluth, MN: flash flood warnings	2	1	50%	5	40%	63 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, 3:20 PM CST	Wind Chill Advisory	DLH	18 hr
Jan 17, 3:31 AM CST	Wind Chill Advisory	DLH	4 days
Jan 18, 3:41 AM CST	Wind Chill Warning	DLH	12 hr
Jan 23, 2:53 PM CST	Wind Chill Advisory	DLH	18 hr
Jan 28, 4:13 AM CST	Snow and Blowing Snow Advisory	DLH	12 hr
Jan 28, 4:13 AM CST	Wind Chill Watch	DLH	12 hr
Jan 28, 4:10 PM CST	Wind Chill Warning	DLH	44 hr
Jan 28, 4:10 PM CST	Winter Weather Advisory	DLH	31 hr
Jan 30, 12:09 PM CST	Wind Chill Advisory	DLH	19 hr
Feb 3, 3:21 PM CST	Snow Advisory	DLH	29 hr
Feb 8, 3:54 AM CST	Wind Chill Watch	DLH	25 hr
Feb 8, 3:28 PM CST	Winter Weather Advisory	DLH	30 hr
Feb 9, 4:33 AM CST	Wind Chill Warning	DLH	52 hr
Feb 10, 4:41 AM CST	Wind Chill Advisory	DLH	31 hr
Feb 13, 3:57 AM CST	Snow Advisory	DLH	29 hr
Feb 13, 4:09 PM CST	Mesoscale Discussion	SPC	6 hr
Feb 14, 3:16 PM CST	Wind Chill Advisory	DLH	19 hr
Feb 16, 3:27 PM CST	Winter Weather Advisory	DLH	8 hr
Feb 19, 3:32 AM CST	Wind Chill Advisory	DLH	32 hr
Feb 19, 3:36 PM CST	Wind Chill Warning	DLH	20 hr
Feb 24, 5:22 AM CST	Dense Fog Advisory	DLH	5 hr
Feb 24, 10:29 AM CST	Dense Fog Advisory	DLH	91 min
Feb 24, 3:30 PM CST	Dense Fog Advisory	DLH	17 hr
Mar 16, 4:05 PM CDT	Winter Storm Watch	DLH	12 hr
Mar 31, 5:57 AM CDT	Snow and Blowing Snow Advisory	DLH	22 hr
Apr 4, 3:31 PM CDT	Winter Storm Watch	DLH	13 hr
Apr 5, 4:36 AM CDT	Winter Storm Warning	DLH	53 hr
Apr 5, 3:50 PM CDT	Winter Weather Advisory	DLH	39 hr
Apr 5, 11:58 PM CDT	Mesoscale Discussion	SPC	4 hr
Apr 6, 7:26 PM CDT	Mesoscale Discussion	SPC	2 hr
Apr 9, 4:29 AM CDT	Winter Storm Watch	DLH	11 hr
Apr 9, 3:32 PM CDT	Winter Storm Warning	DLH	60 hr
Apr 10, 7:49 PM CDT	Mesoscale Discussion	SPC	6 hr
Apr 10, 11:33 PM CDT	Mesoscale Discussion	SPC	4 hr
Apr 23, 4:27 AM CDT	Flood Watch	DLH	58 hr
Apr 24, 4:25 AM CDT	Winter Storm Watch	DLH	24 hr
Apr 25, 4:17 AM CDT	Winter Storm Warning	DLH	38 hr
May 17, 3:47 PM CDT	Frost Advisory	DLH	17 hr
May 18, 2:30 PM CDT	Frost Advisory	DLH	16 hr
May 20, 3:29 PM CDT	Frost Advisory	DLH	15 hr
May 25, 2:25 PM CDT	Mesoscale Discussion	SPC	35 min
May 25, 2:45 PM CDT	Tornado Watch	SPC	6 hr
May 25, 5:25 PM CDT	Severe Thunderstorm Warning	DLH	50 min
May 25, 5:52 PM CDT	Tornado Warning	DLH	23 min
May 25, 6:01 PM CDT	Mesoscale Discussion	SPC	59 min
May 25, 6:11 PM CDT	Tornado Warning	DLH	41 min
May 26, 3:58 AM CDT	Freeze Watch	DLH	11 hr
May 26, 2:39 PM CDT	Freeze Warning	DLH	16 hr
May 27, 4:57 AM CDT	Freeze Watch	DLH	10 hr
May 27, 3:03 PM CDT	Frost Advisory	DLH	16 hr
May 31, 2:07 PM CDT	Mesoscale Discussion	SPC	53 min
May 31, 2:51 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
May 31, 3:13 PM CDT	Severe Thunderstorm Warning	DLH	47 min
May 31, 5:35 PM CDT	Severe Thunderstorm Warning	DLH	40 min
May 31, 5:54 PM CDT	Tornado Warning	DLH	40 min
May 31, 6:23 PM CDT	Mesoscale Discussion	SPC	67 min
Jun 5, 11:01 AM CDT	Flash Flood Watch	DLH	22 hr
Jun 6, 10:09 AM CDT	Mesoscale Discussion	SPC	96 min
Jun 6, 10:28 AM CDT	Tornado Watch	SPC	5 hr
Jun 6, 3:20 PM CDT	Wind Advisory	DLH	5 hr
Jun 12, 7:11 PM CDT	Tornado Warning	DLH	49 min
Jun 12, 7:22 PM CDT	Mesoscale Discussion	SPC	83 min
Jun 12, 7:43 PM CDT	Severe Thunderstorm Warning	DLH	47 min
Jun 12, 7:56 PM CDT	Severe Thunderstorm Warning	DLH	64 min
Jun 12, 10:27 PM CDT	Severe Thunderstorm Warning	DLH	63 min
Jun 12, 11:17 PM CDT	Severe Thunderstorm Warning	DLH	43 min
Jun 12, 11:48 PM CDT	Severe Thunderstorm Warning	DLH	27 min
Jun 13, 12:22 AM CDT	Severe Thunderstorm Warning	DLH	28 min
Jun 14, 6:04 PM CDT	Mesoscale Discussion	SPC	86 min
Jun 14, 6:54 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 14, 7:15 PM CDT	Severe Thunderstorm Warning	DLH	43 min
Jun 14, 8:51 PM CDT	Severe Thunderstorm Warning	DLH	24 min
Jun 14, 9:27 PM CDT	Severe Thunderstorm Warning	DLH	63 min
Jun 14, 9:48 PM CDT	Mesoscale Discussion	SPC	87 min
Jun 14, 10:25 PM CDT	Severe Thunderstorm Warning	DLH	50 min
Jun 14, 10:29 PM CDT	Severe Thunderstorm Warning	DLH	46 min
Jun 27, 12:32 PM CDT	Mesoscale Discussion	SPC	2 hr
Jun 27, 12:34 PM CDT	Severe Thunderstorm Warning	DLH	41 min
Jun 27, 1:09 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 27, 1:35 PM CDT	Severe Thunderstorm Warning	DLH	55 min
Jun 27, 2:33 PM CDT	Severe Thunderstorm Warning	DLH	57 min
Jun 27, 3:41 PM CDT	Mesoscale Discussion	SPC	94 min
Jun 27, 3:57 PM CDT	Severe Thunderstorm Warning	DLH	49 min
Jun 27, 4:43 PM CDT	Severe Thunderstorm Warning	DLH	62 min
Jul 1, 3:51 PM CDT	Mesoscale Discussion	SPC	114 min
Jul 1, 7:53 PM CDT	Mesoscale Discussion	SPC	2 hr
Jul 1, 9:31 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jul 1, 10:30 PM CDT	Severe Thunderstorm Warning	DLH	60 min
Jul 1, 11:04 PM CDT	Mesoscale Discussion	SPC	86 min
Jul 1, 11:29 PM CDT	Severe Thunderstorm Warning	DLH	39 min
Jul 2, 12:45 AM CDT	Severe Thunderstorm Warning	DLH	60 min
Jul 9, 3:34 PM CDT	Mesoscale Discussion	SPC	86 min
Jul 11, 2:26 PM CDT	Tornado Watch	SPC	6 hr
Jul 11, 4:02 PM CDT	Mesoscale Discussion	SPC	88 min
Jul 11, 4:48 PM CDT	Severe Thunderstorm Warning	DLH	57 min
Jul 11, 5:41 PM CDT	Severe Thunderstorm Warning	DLH	64 min
Jul 11, 5:50 PM CDT	Mesoscale Discussion	SPC	85 min
Jul 11, 5:55 PM CDT	Severe Thunderstorm Warning	DLH	50 min
Jul 14, 7:34 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jul 14, 9:33 PM CDT	Mesoscale Discussion	SPC	57 min
Jul 14, 10:07 PM CDT	Severe Thunderstorm Warning	DLH	53 min
Jul 14, 11:22 PM CDT	Mesoscale Discussion	SPC	53 min
Jul 15, 1:18 AM CDT	Mesoscale Discussion	SPC	57 min
Jul 20, 7:31 AM CDT	Severe Thunderstorm Warning	DLH	44 min
Jul 20, 8:09 AM CDT	Severe Thunderstorm Warning	DLH	18 min
Jul 20, 1:37 PM CDT	Mesoscale Discussion	SPC	83 min
Jul 20, 2:46 PM CDT	Severe Thunderstorm Warning	DLH	29 min
Jul 20, 3:50 PM CDT	Severe Thunderstorm Warning	DLH	40 min
Jul 20, 4:13 PM CDT	Tornado Warning	DLH	32 min
Jul 20, 4:21 PM CDT	Severe Thunderstorm Warning	DLH	39 min
Jul 20, 4:39 PM CDT	Severe Thunderstorm Warning	DLH	30 min
Jul 29, 12:36 AM CDT	Mesoscale Discussion	SPC	84 min
Jul 29, 12:56 AM CDT	Severe Thunderstorm Watch	SPC	5 hr
Jul 29, 2:43 AM CDT	Severe Thunderstorm Warning	DLH	62 min
Jul 29, 3:48 AM CDT	Severe Thunderstorm Warning	DLH	57 min
Aug 4, 5:06 AM CDT	Dense Fog Advisory	DLH	4 hr
Aug 22, 3:48 PM CDT	Mesoscale Discussion	SPC	117 min
Aug 27, 2:24 AM CDT	Mesoscale Discussion	SPC	96 min
Aug 28, 2:09 PM CDT	Mesoscale Discussion	SPC	96 min
Sep 8, 3:28 PM CDT	Frost Advisory	DLH	16 hr
Sep 11, 9:49 PM CDT	Dense Fog Advisory	DLH	13 hr
Sep 26, 4:39 AM CDT	Mesoscale Discussion	SPC	96 min
Sep 26, 10:15 AM CDT	Mesoscale Discussion	SPC	90 min
Sep 26, 12:39 PM CDT	Severe Thunderstorm Watch	SPC	9 hr
Sep 26, 5:14 PM CDT	Mesoscale Discussion	SPC	91 min
Sep 26, 5:19 PM CDT	Severe Thunderstorm Warning	DLH	41 min
Sep 26, 5:21 PM CDT	Flash Flood Watch	DLH	4 hr
Sep 26, 5:40 PM CDT	Severe Thunderstorm Warning	DLH	65 min
Sep 26, 6:00 PM CDT	Severe Thunderstorm Warning	DLH	45 min
Sep 26, 6:36 PM CDT	Areal Flood Advisory	DLH	2 hr
Sep 26, 6:43 PM CDT	Severe Thunderstorm Warning	DLH	62 min
Sep 26, 6:44 PM CDT	Mesoscale Discussion	SPC	61 min
Sep 26, 7:02 PM CDT	Flash Flood Warning	DLH	108 min
Oct 10, 5:36 PM CDT	Areal Flood Advisory	DLH	4 hr
Oct 25, 3:22 PM CDT	Wind Advisory	DLH	21 hr
Nov 23, 10:11 AM CST	Freezing Rain Advisory	DLH	11 hr
Dec 11, 3:48 PM CST	Winter Storm Watch	DLH	24 hr
Dec 12, 3:33 PM CST	Winter Storm Warning	DLH	68 hr
Dec 14, 5:25 AM CST	Mesoscale Discussion	SPC	5 hr
Dec 14, 11:23 AM CST	Mesoscale Discussion	SPC	4 hr
Dec 14, 9:24 PM CST	Wind Chill Advisory	DLH	36 hr
Dec 15, 9:15 AM CST	Wind Chill Warning	DLH	24 hr
Dec 18, 3:49 PM CST	Winter Storm Watch	DLH	23 hr
Dec 19, 3:14 PM CST	Winter Storm Warning	DLH	63 hr
Dec 21, 9:50 AM CST	Wind Chill Advisory	DLH	26 hr
Dec 21, 9:50 AM CST	Winter Weather Advisory	DLH	8 hr
Dec 22, 7:35 PM CST	Winter Weather Advisory	DLH	25 hr
Dec 25, 3:31 PM CST	Winter Weather Advisory	DLH	38 hr
Dec 29, 4:24 AM CST	Winter Weather Advisory	DLH	38 hr
Dec 30, 9:07 AM CST	Winter Storm Warning	DLH	9 hr
Dec 30, 2:59 PM CST	Wind Chill Advisory	DLH	19 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	38
Tornado Warning	5
Severe Thunderstorm Watch	7
Tornado Watch	3
Mesoscale Discussion	35
Flooding
Flash Flood Warning	1
Flash Flood Watch	2
Flood Watch	1
Areal Flood Advisory	2
Winter
Winter Storm Warning	6
Winter Storm Watch	6
Freezing Rain Advisory	1
Snow Advisory	2
Snow and Blowing Snow Advisory	2
Winter Weather Advisory	8
Cold
Freeze Warning	1
Wind Chill Warning	5
Freeze Watch	2
Wind Chill Watch	2
Frost Advisory	5
Wind Chill Advisory	10
Wind and dust
Wind Advisory	2
Fog and smoke
Dense Fog Advisory	5

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.