Alert archive / South Dakota / Dewey County

Weather alerts in Dewey County, South Dakota, 2011

163 weather alerts in 2011, 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 2011. Tap one for its archive.

Alerts: 163
Warnings: 60
Watches: 28
Advisories: 34
Busiest month: July43 alerts
Busiest day: August 1, 20117 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 1 tornado warnings covering Dewey County in 2011 had a tornado report inside them.

Dewey County, 2011

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	1	0	100%	0
Severe thunderstorm warnings	38	26	32%	18	89%	32 min
Flash flood warnings	3	1	67%	0

Each office's whole area, 2011

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Aberdeen, SD: tornado warnings	23	5	78%	11	45%	8 min
NWS Aberdeen, SD: severe thunderstorm warnings	224	147	34%	242	85%	21 min
NWS Aberdeen, SD: flash flood warnings	18	9	50%	17	71%	202 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 8, 3:16 AM MST	Winter Weather Advisory	ABR	38 hr
Jan 11, 1:06 AM MST	Wind Chill Advisory	ABR	10 hr
Jan 11, 2:24 PM MST	Wind Chill Advisory	ABR	6 hr
Jan 16, 1:37 PM MST	Winter Weather Advisory	ABR	19 hr
Jan 29, 2:26 PM MST	Winter Weather Advisory	ABR	46 hr
Jan 31, 9:46 AM MST	Wind Chill Advisory	ABR	31 hr
Feb 1, 2:00 AM MST	Wind Chill Warning	ABR	33 hr
Feb 4, 2:36 PM MST	Winter Weather Advisory	ABR	28 hr
Feb 7, 2:42 AM MST	Wind Chill Advisory	ABR	32 hr
Feb 8, 3:16 PM MST	Wind Chill Advisory	ABR	19 hr
Feb 12, 11:07 AM MST	High Wind Watch	ABR	16 hr
Feb 13, 3:01 AM MST	High Wind Warning	ABR	17 hr
Feb 17, 3:06 AM MST	Wind Advisory	ABR	15 hr
Feb 18, 2:49 AM MST	Winter Storm Watch	ABR	24 hr
Feb 19, 2:29 AM MST	Winter Storm Warning	ABR	11 hr
Feb 19, 1:48 PM MST	Blizzard Warning	ABR	37 hr
Feb 20, 3:36 AM MST	Mesoscale Discussion	SPC	4 hr
Feb 20, 8:17 AM MST	Mesoscale Discussion	SPC	4 hr
Feb 23, 1:20 PM MST	Winter Weather Advisory	ABR	5 hr
Feb 23, 1:57 PM MST	Winter Weather Advisory	ABR	32 hr
Mar 11, 2:54 AM MST	Wind Advisory	ABR	14 hr
Mar 17, 12:20 PM MDT	River Flood Warning	ABR	4 days
Mar 19, 3:08 AM MDT	Wind Advisory	ABR	15 hr
Mar 22, 9:34 AM MDT	Winter Weather Advisory	ABR	28 hr
Apr 2, 1:59 PM MDT	Wind Advisory	ABR	44 hr
Apr 9, 4:04 AM MDT	Dense Fog Advisory	ABR	5 hr
Apr 13, 2:42 AM MDT	Winter Storm Watch	ABR	24 hr
Apr 14, 2:24 AM MDT	Winter Storm Warning	ABR	43 hr
Apr 14, 2:24 AM MDT	Winter Weather Advisory	ABR	36 hr
Apr 18, 2:33 PM MDT	Winter Weather Advisory	ABR	30 hr
Apr 19, 8:41 AM MDT	Winter Storm Warning	ABR	11 hr
Apr 21, 2:12 AM MDT	Wind Advisory	ABR	12 hr
Apr 29, 2:29 PM MDT	High Wind Watch	ABR	13 hr
Apr 30, 3:14 AM MDT	High Wind Warning	ABR	18 hr
Apr 30, 3:14 AM MDT	Wind Advisory	ABR	39 hr
May 8, 4:06 PM MDT	Mesoscale Discussion	SPC	54 min
May 8, 5:13 PM MDT	Tornado Watch	SPC	6 hr
May 8, 7:47 PM MDT	Mesoscale Discussion	SPC	58 min
May 9, 8:34 PM MDT	Severe Thunderstorm Watch	SPC	5 hr
May 10, 12:56 AM MDT	Mesoscale Discussion	SPC	94 min
May 16, 2:58 AM MDT	Wind Advisory	ABR	17 hr
May 29, 11:39 AM MDT	Areal Flood Warning	ABR	28 days
May 30, 1:59 AM MDT	High Wind Watch	ABR	24 hr
May 31, 1:29 AM MDT	Wind Advisory	ABR	18 hr
Jun 2, 5:03 PM MDT	Mesoscale Discussion	SPC	87 min
Jun 2, 6:22 PM MDT	Severe Thunderstorm Watch	SPC	8 hr
Jun 2, 9:07 PM MDT	Mesoscale Discussion	SPC	83 min
Jun 2, 9:08 PM MDT	Severe Thunderstorm Warning	ABR	52 min
Jun 2, 10:03 PM MDT	Severe Thunderstorm Warning	ABR	42 min
Jun 2, 10:11 PM MDT	Severe Thunderstorm Warning	ABR	29 min
Jun 2, 11:42 PM MDT	Severe Thunderstorm Warning	ABR	33 min
Jun 12, 6:07 PM MDT	Mesoscale Discussion	SPC	53 min
Jun 12, 6:33 PM MDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 12, 7:40 PM MDT	Severe Thunderstorm Warning	ABR	65 min
Jun 12, 8:42 PM MDT	Severe Thunderstorm Warning	ABR	45 min
Jun 12, 8:55 PM MDT	Mesoscale Discussion	SPC	65 min
Jun 16, 2:52 PM MDT	Flash Flood Watch	ABR	30 hr
Jun 18, 5:28 PM MDT	Severe Thunderstorm Warning	ABR	47 min
Jun 18, 6:15 PM MDT	Severe Thunderstorm Warning	ABR	45 min
Jun 18, 6:59 PM MDT	Severe Thunderstorm Warning	ABR	61 min
Jun 18, 8:19 PM MDT	Flash Flood Warning	ABR	6 hr
Jun 19, 2:38 AM MDT	Flash Flood Watch	ABR	57 hr
Jun 20, 4:33 AM MDT	Areal Flood Warning	ABR	4 hr
Jun 23, 7:17 PM MDT	Flash Flood Warning	ABR	2 min
Jun 23, 7:29 PM MDT	Areal Flood Warning	ABR	28 days
Jun 24, 4:57 PM MDT	Mesoscale Discussion	SPC	2 hr
Jun 24, 5:46 PM MDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 25, 2:33 PM MDT	Flash Flood Watch	ABR	27 hr
Jun 25, 5:21 PM MDT	Mesoscale Discussion	SPC	84 min
Jun 25, 10:27 PM MDT	Mesoscale Discussion	SPC	63 min
Jun 26, 5:08 AM MDT	Mesoscale Discussion	SPC	97 min
Jun 26, 11:35 AM MDT	Mesoscale Discussion	SPC	85 min
Jun 30, 9:46 PM MDT	Severe Thunderstorm Warning	ABR	44 min
Jul 4, 2:51 PM MDT	Mesoscale Discussion	SPC	54 min
Jul 4, 3:45 PM MDT	Severe Thunderstorm Watch	SPC	8 hr
Jul 4, 6:59 PM MDT	Mesoscale Discussion	SPC	2 hr
Jul 4, 9:56 PM MDT	Flash Flood Warning	ABR	6 hr
Jul 4, 9:57 PM MDT	Severe Thunderstorm Warning	ABR	63 min
Jul 6, 12:25 PM MDT	Mesoscale Discussion	SPC	3 hr
Jul 8, 3:29 PM MDT	Mesoscale Discussion	SPC	2 hr
Jul 8, 3:48 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 8, 7:57 PM MDT	Mesoscale Discussion	SPC	63 min
Jul 10, 1:29 PM MDT	Tornado Watch	SPC	7 hr
Jul 10, 3:46 PM MDT	Severe Thunderstorm Warning	ABR	44 min
Jul 14, 2:55 PM MDT	Mesoscale Discussion	SPC	2 hr
Jul 14, 4:33 PM MDT	Tornado Watch	SPC	7 hr
Jul 14, 8:46 PM MDT	Mesoscale Discussion	SPC	59 min
Jul 14, 8:54 PM MDT	Severe Thunderstorm Warning	ABR	51 min
Jul 14, 9:43 PM MDT	Severe Thunderstorm Warning	ABR	45 min
Jul 15, 2:15 AM MDT	Excessive Heat Warning	ABR	5 days
Jul 16, 2:53 PM MDT	Mesoscale Discussion	SPC	97 min
Jul 18, 2:11 PM MDT	Mesoscale Discussion	SPC	94 min
Jul 19, 1:42 PM MDT	Wind Advisory	ABR	24 hr
Jul 22, 1:31 AM MDT	Areal Flood Warning	ABR	7 days
Jul 22, 4:35 PM MDT	Tornado Watch	SPC	8 hr
Jul 22, 7:56 PM MDT	Mesoscale Discussion	SPC	94 min
Jul 22, 11:48 PM MDT	Severe Thunderstorm Warning	ABR	57 min
Jul 25, 11:23 AM MDT	Mesoscale Discussion	SPC	97 min
Jul 25, 9:10 PM MDT	Severe Thunderstorm Warning	ABR	50 min
Jul 26, 2:59 PM MDT	Mesoscale Discussion	SPC	2 hr
Jul 26, 4:21 PM MDT	Tornado Watch	SPC	5 hr
Jul 27, 6:09 PM MDT	Mesoscale Discussion	SPC	2 hr
Jul 28, 1:05 PM MDT	Mesoscale Discussion	SPC	115 min
Jul 28, 2:31 PM MDT	Severe Thunderstorm Watch	SPC	5 hr
Jul 28, 5:13 PM MDT	Severe Thunderstorm Warning	ABR	62 min
Jul 28, 5:19 PM MDT	Mesoscale Discussion	SPC	86 min
Jul 28, 6:03 PM MDT	Severe Thunderstorm Warning	ABR	57 min
Jul 28, 6:44 PM MDT	Severe Thunderstorm Warning	ABR	40 min
Jul 28, 8:24 PM MDT	Areal Flood Warning	ABR	21 days
Jul 29, 7:34 PM MDT	Severe Thunderstorm Warning	ABR	15 min
Jul 29, 7:58 PM MDT	Severe Thunderstorm Warning	ABR	47 min
Jul 29, 8:06 PM MDT	Mesoscale Discussion	SPC	54 min
Jul 29, 8:43 PM MDT	Severe Thunderstorm Warning	ABR	47 min
Jul 30, 2:56 PM MDT	Heat Advisory	ABR	54 hr
Jul 31, 4:44 PM MDT	Tornado Watch	SPC	7 hr
Aug 1, 1:36 AM MDT	Severe Thunderstorm Warning	ABR	24 min
Aug 1, 12:33 PM MDT	Mesoscale Discussion	SPC	57 min
Aug 1, 1:19 PM MDT	Severe Thunderstorm Watch	SPC	6 hr
Aug 1, 4:43 PM MDT	Severe Thunderstorm Warning	ABR	62 min
Aug 1, 4:57 PM MDT	Mesoscale Discussion	SPC	2 hr
Aug 1, 5:10 PM MDT	Mesoscale Discussion	SPC	2 hr
Aug 1, 5:38 PM MDT	Severe Thunderstorm Warning	ABR	30 min
Aug 5, 12:05 PM MDT	Mesoscale Discussion	SPC	2 hr
Aug 5, 12:48 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Aug 5, 4:25 PM MDT	Mesoscale Discussion	SPC	2 hr
Aug 5, 5:03 PM MDT	Severe Thunderstorm Warning	ABR	57 min
Aug 5, 5:26 PM MDT	Mesoscale Discussion	SPC	94 min
Aug 5, 5:59 PM MDT	Severe Thunderstorm Warning	ABR	61 min
Aug 5, 6:12 PM MDT	Severe Thunderstorm Warning	ABR	48 min
Aug 5, 7:00 PM MDT	Severe Thunderstorm Warning	ABR	60 min
Aug 5, 7:30 PM MDT	Severe Thunderstorm Warning	ABR	46 min
Aug 7, 8:07 PM MDT	Severe Thunderstorm Warning	ABR	53 min
Aug 11, 12:49 PM MDT	Mesoscale Discussion	SPC	86 min
Aug 11, 2:05 PM MDT	Tornado Watch	SPC	5 hr
Aug 11, 2:11 PM MDT	Severe Thunderstorm Warning	ABR	64 min
Aug 14, 7:42 PM MDT	Mesoscale Discussion	SPC	93 min
Aug 14, 8:15 PM MDT	Tornado Warning	ABR	30 min
Aug 14, 8:46 PM MDT	Severe Thunderstorm Warning	ABR	27 min
Aug 15, 11:46 PM MDT	Severe Thunderstorm Warning	ABR	59 min
Aug 18, 2:43 PM MDT	Mesoscale Discussion	SPC	92 min
Aug 18, 3:45 PM MDT	Severe Thunderstorm Watch	SPC	4 hr
Aug 18, 4:42 PM MDT	Severe Thunderstorm Warning	ABR	46 min
Aug 28, 1:09 AM MDT	Mesoscale Discussion	SPC	66 min
Sep 19, 2:13 AM MDT	High Wind Watch	ABR	12 hr
Sep 19, 2:03 PM MDT	High Wind Warning	ABR	24 hr
Sep 19, 2:03 PM MDT	Wind Advisory	ABR	31 hr
Oct 4, 2:14 PM MDT	Wind Advisory	ABR	68 hr
Oct 6, 2:04 PM MDT	High Wind Warning	ABR	29 hr
Oct 6, 7:01 PM MDT	Severe Thunderstorm Warning	ABR	44 min
Oct 6, 7:15 PM MDT	Severe Thunderstorm Warning	ABR	33 min
Oct 6, 7:23 PM MDT	Severe Thunderstorm Warning	ABR	52 min
Oct 6, 7:45 PM MDT	Mesoscale Discussion	SPC	90 min
Nov 6, 2:19 AM MST	Wind Advisory	ABR	15 hr
Nov 15, 2:35 AM MST	Wind Advisory	ABR	13 hr
Nov 17, 1:46 PM MST	Winter Storm Watch	ABR	25 hr
Nov 18, 1:43 PM MST	Winter Storm Warning	ABR	24 hr
Nov 19, 9:08 AM MST	Winter Weather Advisory	ABR	5 hr
Nov 22, 4:45 AM MST	Dense Fog Advisory	ABR	4 hr
Nov 25, 1:59 AM MST	Wind Advisory	ABR	39 hr
Dec 25, 2:09 PM MST	Wind Advisory	ABR	29 hr
Dec 30, 2:46 AM MST	High Wind Watch	ABR	10 hr
Dec 30, 1:09 PM MST	High Wind Warning	ABR	28 hr
Dec 30, 1:09 PM MST	Wind Advisory	ABR	52 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	1
Severe Thunderstorm Watch	10
Tornado Watch	7
Mesoscale Discussion	41
Flooding
Areal Flood Warning	5
Flash Flood Warning	3
River Flood Warning	1
Flash Flood Watch	3
Winter
Blizzard Warning	1
Winter Storm Warning	4
Winter Storm Watch	3
Winter Weather Advisory	10
Heat
Excessive Heat Warning	1
Heat Advisory	1
Cold
Wind Chill Warning	1
Wind Chill Advisory	5
Wind and dust
High Wind Warning	5
High Wind Watch	5
Wind Advisory	16
Fog and smoke
Dense Fog Advisory	2

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2010 2012

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.