Alert archive / South Dakota / Dewey County

Weather alerts in Dewey County, South Dakota, 2008

175 weather alerts in 2008, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Dewey County and its neighbors

Each county as a circle sized by its count in 2008. Tap one for its archive.

Alerts: 175
Warnings: 69
Watches: 27
Advisories: 41
Busiest month: June49 alerts
Busiest day: June 27, 200818 alerts

Over time

By month

Warning verification

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

3 of 11 tornado warnings covering Dewey County in 2008 had a tornado report inside them; 7 of 9 tornado reports fell inside a warning, on average 14 minutes after it went out.

Dewey County, 2008

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	11	3	73%	9	78%	14 min
Severe thunderstorm warnings	45	25	44%	23	96%	21 min
Flash flood warnings	2	1	50%	1	100%	51 min

Each office's whole area, 2008

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Aberdeen, SD: tornado warnings	29	7	76%	14	71%	14 min
NWS Aberdeen, SD: severe thunderstorm warnings	259	122	53%	247	79%	22 min
NWS Aberdeen, SD: flash flood warnings	9	4	56%	6	67%	41 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, Mountain Time. Each opens its own page with the text, the map, the radar and the sounding.

Issued	Product	Office	Lasted
Jan 17, 2:39 PM MST	Wind Chill Advisory	ABR	45 hr
Jan 21, 1:33 PM MST	Wind Chill Advisory	ABR	20 hr
Jan 22, 2:35 PM MST	Blowing Snow Advisory	ABR	20 hr
Jan 28, 2:45 AM MST	Winter Weather Advisory	ABR	24 hr
Jan 28, 2:26 PM MST	Wind Chill Advisory	ABR	45 hr
Jan 29, 2:57 AM MST	Wind Chill Warning	ABR	32 hr
Feb 3, 2:49 PM MST	Snow Advisory	ABR	19 hr
Feb 4, 9:24 AM MST	Winter Weather Advisory	ABR	5 hr
Feb 8, 2:43 PM MST	Wind Chill Advisory	ABR	47 hr
Feb 10, 1:51 PM MST	Winter Weather Advisory	ABR	20 hr
Feb 11, 6:07 AM MST	Mesoscale Discussion	SPC	3 hr
Feb 11, 9:56 AM MST	Snow Advisory	ABR	7 hr
Feb 13, 2:33 PM MST	Wind Chill Advisory	ABR	24 hr
Feb 17, 1:17 PM MST	Wind Advisory	ABR	5 hr
Mar 2, 2:30 AM MST	Wind Advisory	ABR	18 hr
Mar 25, 2:39 PM MDT	Winter Storm Watch	ABR	45 hr
Mar 29, 3:14 AM MDT	Wind Advisory	ABR	16 hr
Mar 29, 2:26 PM MDT	Mesoscale Discussion	SPC	3 hr
Mar 29, 2:41 PM MDT	Winter Storm Watch	ABR	23 hr
Apr 5, 10:44 PM MDT	Winter Weather Advisory	ABR	21 hr
Apr 6, 5:35 AM MDT	Winter Storm Warning	ABR	17 hr
Apr 11, 2:59 AM MDT	Winter Weather Advisory	ABR	9 hr
Apr 14, 2:48 PM MDT	Wind Advisory	ABR	29 hr
Apr 20, 3:20 AM MDT	Wind Advisory	ABR	15 hr
Apr 20, 6:05 PM MDT	Mesoscale Discussion	SPC	55 min
May 2, 3:23 AM MDT	Wind Advisory	ABR	19 hr
May 9, 2:24 PM MDT	Winter Weather Advisory	ABR	22 hr
May 10, 3:10 AM MDT	Wind Advisory	ABR	15 hr
May 19, 10:44 AM MDT	Wind Advisory	ABR	9 hr
May 24, 1:39 PM MDT	Tornado Watch	SPC	7 hr
May 24, 3:53 PM MDT	Severe Thunderstorm Warning	ABR	52 min
May 24, 4:10 PM MDT	Tornado Warning	ABR	35 min
May 24, 4:39 PM MDT	Tornado Warning	ABR	36 min
May 24, 4:41 PM MDT	Severe Thunderstorm Warning	ABR	49 min
May 24, 5:07 PM MDT	Mesoscale Discussion	SPC	113 min
May 24, 5:10 PM MDT	Tornado Warning	ABR	35 min
May 24, 5:27 PM MDT	Severe Thunderstorm Warning	ABR	63 min
May 24, 6:06 PM MDT	Severe Thunderstorm Warning	ABR	23 min
May 30, 8:01 PM MDT	Severe Thunderstorm Warning	ABR	44 min
Jun 1, 8:21 PM MDT	Severe Thunderstorm Warning	ABR	54 min
Jun 5, 1:55 PM MDT	Areal Flood Warning	ABR	19 hr
Jun 5, 3:42 PM MDT	River Flood Warning	ABR	5 days
Jun 8, 1:53 PM MDT	Mesoscale Discussion	SPC	2 hr
Jun 10, 2:12 AM MDT	Flood Watch	ABR	30 hr
Jun 10, 7:06 PM MDT	Tornado Watch	SPC	5 hr
Jun 10, 9:31 PM MDT	Areal Flood Advisory	ABR	3 hr
Jun 10, 9:51 PM MDT	Mesoscale Discussion	SPC	54 min
Jun 10, 11:39 PM MDT	Mesoscale Discussion	SPC	36 min
Jun 10, 11:55 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 10, 11:59 PM MDT	Severe Thunderstorm Warning	ABR	61 min
Jun 11, 2:19 AM MDT	Mesoscale Discussion	SPC	116 min
Jun 13, 4:33 PM MDT	Mesoscale Discussion	SPC	87 min
Jun 18, 12:19 PM MDT	Mesoscale Discussion	SPC	56 min
Jun 18, 1:19 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 18, 5:29 PM MDT	Mesoscale Discussion	SPC	2 hr
Jun 18, 7:46 PM MDT	Mesoscale Discussion	SPC	89 min
Jun 18, 9:42 PM MDT	Severe Thunderstorm Warning	ABR	21 min
Jun 21, 3:41 PM MDT	Severe Thunderstorm Warning	ABR	64 min
Jun 24, 2:44 PM MDT	Severe Thunderstorm Watch	SPC	4 hr
Jun 24, 6:52 PM MDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 24, 8:03 PM MDT	Severe Thunderstorm Warning	ABR	57 min
Jun 24, 8:34 PM MDT	Severe Thunderstorm Warning	ABR	26 min
Jun 24, 9:00 PM MDT	Severe Thunderstorm Warning	ABR	60 min
Jun 24, 9:58 PM MDT	Severe Thunderstorm Warning	ABR	34 min
Jun 25, 11:13 PM MDT	Severe Thunderstorm Warning	ABR	32 min
Jun 25, 11:46 PM MDT	Severe Thunderstorm Warning	ABR	12 min
Jun 26, 2:48 PM MDT	Mesoscale Discussion	SPC	87 min
Jun 26, 5:28 PM MDT	Mesoscale Discussion	SPC	62 min
Jun 26, 5:59 PM MDT	Severe Thunderstorm Warning	ABR	46 min
Jun 26, 6:10 PM MDT	Severe Thunderstorm Warning	ABR	65 min
Jun 26, 6:14 PM MDT	Tornado Watch	SPC	7 hr
Jun 26, 6:38 PM MDT	Tornado Warning	ABR	37 min
Jun 26, 6:41 PM MDT	Severe Thunderstorm Warning	ABR	64 min
Jun 26, 7:15 PM MDT	Severe Thunderstorm Warning	ABR	60 min
Jun 26, 7:21 PM MDT	Tornado Warning	ABR	39 min
Jun 26, 7:23 PM MDT	Severe Thunderstorm Warning	ABR	52 min
Jun 26, 7:27 PM MDT	Tornado Warning	ABR	33 min
Jun 26, 7:56 PM MDT	Areal Flood Advisory	ABR	6 hr
Jun 26, 7:56 PM MDT	Tornado Warning	ABR	34 min
Jun 26, 8:00 PM MDT	Tornado Warning	ABR	30 min
Jun 26, 8:14 PM MDT	Severe Thunderstorm Warning	ABR	24 min
Jun 26, 8:18 PM MDT	Severe Thunderstorm Warning	ABR	12 min
Jun 26, 8:21 PM MDT	Severe Thunderstorm Warning	ABR	54 min
Jun 26, 8:25 PM MDT	Tornado Warning	ABR	50 min
Jun 26, 8:28 PM MDT	Severe Thunderstorm Warning	ABR	62 min
Jun 26, 9:27 PM MDT	Severe Thunderstorm Warning	ABR	63 min
Jun 27, 1:03 AM MDT	Mesoscale Discussion	SPC	57 min
Jun 28, 3:13 AM MDT	Wind Advisory	ABR	16 hr
Jul 5, 2:34 PM MDT	Mesoscale Discussion	SPC	116 min
Jul 11, 3:32 AM MDT	Wind Advisory	ABR	16 hr
Jul 12, 3:50 AM MDT	Wind Advisory	ABR	14 hr
Jul 16, 3:50 PM MDT	Mesoscale Discussion	SPC	115 min
Jul 16, 10:54 PM MDT	Mesoscale Discussion	SPC	96 min
Jul 17, 2:12 AM MDT	Severe Thunderstorm Warning	ABR	48 min
Jul 18, 4:32 PM MDT	Severe Thunderstorm Watch	SPC	10 hr
Jul 18, 7:28 PM MDT	Severe Thunderstorm Warning	ABR	62 min
Jul 18, 7:45 PM MDT	Mesoscale Discussion	SPC	2 hr
Jul 18, 8:29 PM MDT	Severe Thunderstorm Warning	ABR	61 min
Jul 18, 8:58 PM MDT	Severe Thunderstorm Watch	SPC	6 hr
Jul 18, 9:23 PM MDT	Severe Thunderstorm Warning	ABR	67 min
Jul 18, 10:05 PM MDT	Severe Thunderstorm Warning	ABR	55 min
Jul 18, 11:08 PM MDT	Flash Flood Warning	ABR	6 hr
Jul 23, 4:47 PM MDT	Severe Thunderstorm Warning	ABR	58 min
Jul 23, 5:21 PM MDT	Tornado Warning	ABR	24 min
Jul 23, 5:24 PM MDT	Mesoscale Discussion	SPC	2 hr
Jul 23, 5:45 PM MDT	Severe Thunderstorm Warning	ABR	60 min
Jul 23, 5:51 PM MDT	Severe Thunderstorm Watch	SPC	4 hr
Jul 23, 5:55 PM MDT	Flash Flood Warning	ABR	2 hr
Jul 23, 5:56 PM MDT	Tornado Warning	ABR	34 min
Jul 23, 6:04 PM MDT	Severe Thunderstorm Warning	ABR	35 min
Jul 24, 2:04 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 24, 6:13 PM MDT	Severe Thunderstorm Warning	ABR	30 min
Jul 24, 6:36 PM MDT	Mesoscale Discussion	SPC	54 min
Jul 26, 7:51 PM MDT	Mesoscale Discussion	SPC	84 min
Jul 26, 8:02 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 26, 9:10 PM MDT	Severe Thunderstorm Warning	ABR	65 min
Jul 26, 10:09 PM MDT	Severe Thunderstorm Warning	ABR	66 min
Jul 26, 10:15 PM MDT	Mesoscale Discussion	SPC	90 min
Jul 27, 1:25 AM MDT	Mesoscale Discussion	SPC	95 min
Jul 27, 2:14 AM MDT	Severe Thunderstorm Watch	SPC	5 hr
Jul 28, 5:20 PM MDT	Tornado Watch	SPC	4 hr
Jul 28, 7:47 PM MDT	Mesoscale Discussion	SPC	88 min
Jul 30, 2:39 PM MDT	Mesoscale Discussion	SPC	66 min
Jul 30, 3:07 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 30, 6:04 PM MDT	Mesoscale Discussion	SPC	56 min
Jul 30, 11:50 PM MDT	Mesoscale Discussion	SPC	85 min
Aug 2, 11:05 PM MDT	Severe Thunderstorm Watch	SPC	8 hr
Aug 3, 2:59 AM MDT	Severe Thunderstorm Warning	ABR	61 min
Aug 3, 3:12 AM MDT	Severe Thunderstorm Warning	ABR	63 min
Aug 3, 3:45 AM MDT	Severe Thunderstorm Warning	ABR	60 min
Aug 11, 1:58 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Aug 20, 3:06 AM MDT	Wind Advisory	ABR	15 hr
Aug 22, 2:33 AM MDT	Wind Advisory	ABR	17 hr
Aug 26, 1:33 PM MDT	Mesoscale Discussion	SPC	2 hr
Aug 26, 3:56 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Aug 26, 6:06 PM MDT	Severe Thunderstorm Warning	ABR	39 min
Aug 26, 7:17 PM MDT	Severe Thunderstorm Warning	ABR	58 min
Aug 26, 7:33 PM MDT	Severe Thunderstorm Warning	ABR	57 min
Aug 26, 8:14 PM MDT	Severe Thunderstorm Warning	ABR	46 min
Aug 26, 8:29 PM MDT	Severe Thunderstorm Warning	ABR	24 min
Aug 31, 2:36 AM MDT	Wind Advisory	ABR	17 hr
Sep 22, 4:21 PM MDT	Mesoscale Discussion	SPC	84 min
Sep 22, 4:57 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Sep 22, 9:21 PM MDT	Severe Thunderstorm Warning	ABR	39 min
Oct 4, 1:56 AM MDT	Wind Advisory	ABR	19 hr
Oct 8, 6:46 PM MDT	Freeze Warning	ABR	9 hr
Oct 13, 2:03 PM MDT	Freeze Warning	ABR	18 hr
Oct 25, 10:48 AM MDT	High Wind Watch	ABR	16 hr
Oct 26, 2:51 AM MDT	High Wind Warning	ABR	15 hr
Nov 4, 3:35 AM MST	Winter Storm Watch	ABR	11 hr
Nov 4, 3:04 PM MST	Blizzard Watch	ABR	21 hr
Nov 5, 3:48 AM MST	Blizzard Warning	ABR	55 hr
Nov 5, 1:51 PM MST	Mesoscale Discussion	SPC	114 min
Nov 6, 3:48 AM MST	Winter Weather Advisory	ABR	10 hr
Nov 6, 11:38 AM MST	Mesoscale Discussion	SPC	4 hr
Nov 6, 5:32 PM MST	Mesoscale Discussion	SPC	4 hr
Nov 13, 1:45 PM MST	Wind Advisory	ABR	27 hr
Nov 14, 1:17 PM MST	Mesoscale Discussion	SPC	58 min
Nov 21, 12:54 PM MST	Winter Weather Advisory	ABR	7 hr
Dec 2, 8:32 AM MST	Winter Weather Advisory	ABR	14 hr
Dec 2, 11:29 AM MST	Mesoscale Discussion	SPC	4 hr
Dec 8, 3:10 AM MST	Winter Weather Advisory	ABR	17 hr
Dec 8, 5:22 AM MST	Mesoscale Discussion	SPC	4 hr
Dec 12, 2:49 AM MST	Blizzard Watch	ABR	24 hr
Dec 13, 2:36 AM MST	Blizzard Warning	ABR	47 hr
Dec 13, 5:29 PM MST	Mesoscale Discussion	SPC	4 hr
Dec 13, 11:07 PM MST	Mesoscale Discussion	SPC	4 hr
Dec 14, 2:33 PM MST	Wind Chill Warning	ABR	23 hr
Dec 18, 1:22 PM MST	Blizzard Watch	ABR	14 hr
Dec 19, 3:49 AM MST	Winter Weather Advisory	ABR	31 hr
Dec 20, 10:50 AM MST	Wind Chill Warning	ABR	28 hr
Dec 22, 2:52 AM MST	Wind Chill Advisory	ABR	6 hr
Dec 22, 2:19 PM MST	Winter Weather Advisory	ABR	19 hr
Dec 25, 2:23 PM MST	Winter Weather Advisory	ABR	32 hr
Dec 29, 2:40 PM MST	Wind Advisory	ABR	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	45
Tornado Warning	11
Severe Thunderstorm Watch	15
Tornado Watch	4
Mesoscale Discussion	38
Flooding
Areal Flood Warning	1
Flash Flood Warning	2
River Flood Warning	1
Flood Watch	1
Areal Flood Advisory	2
Winter
Blizzard Warning	2
Winter Storm Warning	1
Blizzard Watch	3
Winter Storm Watch	3
Blowing Snow Advisory	1
Snow Advisory	2
Winter Weather Advisory	13
Cold
Freeze Warning	2
Wind Chill Warning	3
Wind Chill Advisory	6
Wind and dust
High Wind Warning	1
High Wind Watch	1
Wind Advisory	17

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.