Alert archive / South Dakota / Dewey County

Weather alerts in Dewey County, South Dakota, 2016

161 weather alerts in 2016, 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 2016. Tap one for its archive.

Alerts: 161
Warnings: 63
Watches: 22
Advisories: 25
Busiest month: July52 alerts
Busiest day: August 10, 201610 alerts

Over time

By month

Warning verification

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

Dewey County, 2016

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	0			0
Severe thunderstorm warnings	50	36	28%	24	88%	25 min
Flash flood warnings	2	1	50%	1	100%	61 min

Each office's whole area, 2016

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Aberdeen, SD: tornado warnings	16	4	75%	14	36%	8 min
NWS Aberdeen, SD: severe thunderstorm warnings	291	186	36%	362	83%	22 min
NWS Aberdeen, SD: flash flood warnings	7	3	57%	7	57%	36 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 16, 1:55 AM MST	Wind Chill Advisory	ABR	48 hr
Jan 19, 6:41 PM MST	Dense Fog Advisory	ABR	14 hr
Feb 5, 2:56 AM MST	High Wind Watch	ABR	24 hr
Feb 6, 2:36 AM MST	High Wind Warning	ABR	44 hr
Feb 12, 2:14 PM MST	Winter Weather Advisory	ABR	42 hr
Feb 13, 9:08 PM MST	Winter Storm Warning	ABR	9 hr
Feb 18, 2:38 AM MST	High Wind Watch	ABR	10 hr
Feb 18, 1:02 PM MST	High Wind Warning	ABR	25 hr
Feb 29, 10:58 AM MST	Winter Weather Advisory	ABR	7 hr
Mar 4, 4:34 AM MST	Freezing Rain Advisory	ABR	4 hr
Mar 16, 2:30 AM MDT	Wind Advisory	ABR	15 hr
Mar 30, 1:28 PM MDT	Wind Advisory	ABR	29 hr
Apr 5, 2:15 AM MDT	Wind Advisory	ABR	31 hr
Apr 6, 2:19 PM MDT	Wind Advisory	ABR	28 hr
Apr 9, 1:42 AM MDT	Wind Advisory	ABR	15 hr
May 13, 2:04 AM MDT	Freeze Warning	ABR	30 hr
May 14, 10:33 AM MDT	Frost Advisory	ABR	21 hr
May 22, 2:57 PM MDT	Mesoscale Discussion	SPC	93 min
May 22, 4:21 PM MDT	Severe Thunderstorm Watch	SPC	8 hr
May 22, 7:07 PM MDT	Severe Thunderstorm Warning	ABR	38 min
May 22, 8:06 PM MDT	Mesoscale Discussion	SPC	114 min
May 29, 4:55 PM MDT	Special Weather Statement	ABR	65 min
May 30, 1:16 PM MDT	Mesoscale Discussion	SPC	59 min
May 30, 1:48 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
May 30, 1:55 PM MDT	Severe Thunderstorm Warning	ABR	50 min
May 30, 3:43 PM MDT	Severe Thunderstorm Warning	ABR	48 min
May 30, 4:09 PM MDT	Severe Thunderstorm Warning	ABR	30 min
May 30, 4:26 PM MDT	Severe Thunderstorm Warning	ABR	36 min
Jun 2, 2:03 PM MDT	Mesoscale Discussion	SPC	2 hr
Jun 2, 4:04 PM MDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 2, 6:23 PM MDT	Mesoscale Discussion	SPC	97 min
Jun 2, 6:52 PM MDT	Severe Thunderstorm Warning	ABR	38 min
Jun 9, 3:04 PM MDT	Heat Advisory	ABR	52 hr
Jun 9, 11:58 PM MDT	Special Weather Statement	ABR	62 min
Jun 11, 5:51 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 12, 3:49 AM MDT	Special Weather Statement	ABR	56 min
Jun 12, 4:55 AM MDT	Severe Thunderstorm Warning	ABR	28 min
Jun 16, 5:16 PM MDT	Mesoscale Discussion	SPC	119 min
Jun 21, 3:46 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 21, 7:00 PM MDT	Mesoscale Discussion	SPC	60 min
Jun 29, 4:04 PM MDT	Special Weather Statement	ABR	41 min
Jun 29, 4:15 PM MDT	Mesoscale Discussion	SPC	2 hr
Jun 29, 4:41 PM MDT	Special Weather Statement	ABR	49 min
Jul 3, 2:38 PM MDT	Mesoscale Discussion	SPC	2 hr
Jul 4, 10:42 PM MDT	Severe Thunderstorm Warning	ABR	35 min
Jul 6, 2:21 PM MDT	Tornado Watch	SPC	7 hr
Jul 6, 5:21 PM MDT	Severe Thunderstorm Warning	ABR	39 min
Jul 6, 5:57 PM MDT	Severe Thunderstorm Warning	ABR	48 min
Jul 6, 6:42 PM MDT	Severe Thunderstorm Warning	ABR	48 min
Jul 9, 2:04 PM MDT	Heat Advisory	ABR	28 hr
Jul 9, 5:58 PM MDT	Mesoscale Discussion	SPC	92 min
Jul 9, 7:47 PM MDT	Special Weather Statement	ABR	43 min
Jul 9, 8:15 PM MDT	Severe Thunderstorm Warning	ABR	60 min
Jul 9, 9:18 PM MDT	Severe Thunderstorm Warning	ABR	42 min
Jul 9, 10:02 PM MDT	Severe Thunderstorm Warning	ABR	58 min
Jul 10, 2:06 PM MDT	Mesoscale Discussion	SPC	84 min
Jul 10, 6:35 PM MDT	Mesoscale Discussion	SPC	55 min
Jul 10, 6:54 PM MDT	Mesoscale Discussion	SPC	96 min
Jul 10, 7:31 PM MDT	Severe Thunderstorm Warning	ABR	37 min
Jul 10, 9:38 PM MDT	Severe Thunderstorm Warning	ABR	67 min
Jul 10, 9:40 PM MDT	Severe Thunderstorm Watch	SPC	6 hr
Jul 11, 4:25 PM MDT	Severe Thunderstorm Warning	ABR	50 min
Jul 16, 10:24 AM MDT	Special Weather Statement	ABR	51 min
Jul 16, 10:38 AM MDT	Severe Thunderstorm Warning	ABR	23 min
Jul 16, 11:27 AM MDT	Mesoscale Discussion	SPC	2 hr
Jul 16, 12:09 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 16, 2:18 PM MDT	Mesoscale Discussion	SPC	87 min
Jul 16, 4:09 PM MDT	Mesoscale Discussion	SPC	96 min
Jul 16, 5:57 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 16, 6:07 PM MDT	Mesoscale Discussion	SPC	83 min
Jul 16, 7:50 PM MDT	Severe Thunderstorm Warning	ABR	40 min
Jul 16, 8:50 PM MDT	Severe Thunderstorm Warning	ABR	40 min
Jul 18, 2:45 AM MDT	Excessive Heat Watch	ABR	24 hr
Jul 19, 2:35 AM MDT	Excessive Heat Warning	ABR	4 days
Jul 22, 1:17 PM MDT	Mesoscale Discussion	SPC	2 hr
Jul 22, 3:06 PM MDT	Severe Thunderstorm Watch	SPC	9 hr
Jul 22, 3:48 PM MDT	Severe Thunderstorm Warning	ABR	42 min
Jul 22, 4:28 PM MDT	Severe Thunderstorm Warning	ABR	62 min
Jul 22, 4:33 PM MDT	Severe Thunderstorm Warning	ABR	57 min
Jul 22, 4:52 PM MDT	Severe Thunderstorm Warning	ABR	68 min
Jul 22, 5:28 PM MDT	Severe Thunderstorm Warning	ABR	47 min
Jul 22, 5:35 PM MDT	Mesoscale Discussion	SPC	55 min
Jul 22, 5:59 PM MDT	Flash Flood Warning	ABR	6 hr
Jul 22, 6:13 PM MDT	Severe Thunderstorm Warning	ABR	47 min
Jul 23, 3:55 AM MDT	Special Weather Statement	ABR	50 min
Jul 23, 4:00 AM MDT	Severe Thunderstorm Warning	ABR	23 min
Jul 23, 5:02 AM MDT	Special Weather Statement	ABR	43 min
Jul 23, 5:10 AM MDT	Severe Thunderstorm Warning	ABR	17 min
Jul 23, 5:33 AM MDT	Severe Thunderstorm Warning	ABR	28 min
Jul 30, 5:15 PM MDT	Severe Thunderstorm Warning	ABR	60 min
Jul 30, 5:46 PM MDT	Severe Thunderstorm Warning	ABR	59 min
Jul 30, 6:09 PM MDT	Severe Thunderstorm Warning	ABR	66 min
Jul 30, 6:34 PM MDT	Mesoscale Discussion	SPC	86 min
Jul 30, 6:40 PM MDT	Severe Thunderstorm Warning	ABR	34 min
Jul 31, 4:42 PM MDT	Mesoscale Discussion	SPC	2 hr
Jul 31, 7:46 PM MDT	Mesoscale Discussion	SPC	89 min
Jul 31, 8:55 PM MDT	Special Weather Statement	ABR	65 min
Aug 1, 1:38 PM MDT	Mesoscale Discussion	SPC	2 hr
Aug 1, 2:19 PM MDT	Severe Thunderstorm Watch	SPC	8 hr
Aug 2, 10:06 PM MDT	Special Weather Statement	ABR	39 min
Aug 2, 11:12 PM MDT	Special Weather Statement	ABR	48 min
Aug 3, 1:52 PM MDT	Mesoscale Discussion	SPC	53 min
Aug 3, 2:39 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Aug 8, 8:54 PM MDT	Special Weather Statement	ABR	51 min
Aug 8, 9:14 PM MDT	Severe Thunderstorm Warning	ABR	46 min
Aug 8, 9:46 PM MDT	Special Weather Statement	ABR	44 min
Aug 8, 10:22 PM MDT	Severe Thunderstorm Warning	ABR	38 min
Aug 9, 4:16 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Aug 9, 6:30 PM MDT	Mesoscale Discussion	SPC	2 hr
Aug 9, 8:51 PM MDT	Mesoscale Discussion	SPC	114 min
Aug 9, 9:45 PM MDT	Severe Thunderstorm Warning	ABR	60 min
Aug 9, 10:43 PM MDT	Severe Thunderstorm Warning	ABR	47 min
Aug 9, 11:00 PM MDT	Severe Thunderstorm Warning	ABR	45 min
Aug 9, 11:17 PM MDT	Severe Thunderstorm Warning	ABR	43 min
Aug 10, 12:19 AM MDT	Severe Thunderstorm Warning	ABR	41 min
Aug 10, 12:15 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Aug 10, 2:49 PM MDT	Mesoscale Discussion	SPC	56 min
Aug 10, 5:49 PM MDT	Severe Thunderstorm Warning	ABR	41 min
Aug 10, 6:03 PM MDT	Severe Thunderstorm Warning	ABR	42 min
Aug 10, 6:26 PM MDT	Severe Thunderstorm Warning	ABR	34 min
Aug 10, 6:27 PM MDT	Severe Thunderstorm Warning	ABR	35 min
Aug 10, 6:41 PM MDT	Severe Thunderstorm Warning	ABR	26 min
Aug 10, 7:00 PM MDT	Severe Thunderstorm Watch	SPC	6 hr
Aug 10, 7:30 PM MDT	Flash Flood Warning	ABR	6 hr
Aug 10, 7:32 PM MDT	Severe Thunderstorm Warning	ABR	28 min
Aug 14, 4:42 PM MDT	Mesoscale Discussion	SPC	2 hr
Aug 14, 5:15 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Aug 14, 5:43 PM MDT	Special Weather Statement	ABR	47 min
Aug 14, 5:51 PM MDT	Severe Thunderstorm Warning	ABR	54 min
Aug 14, 6:35 PM MDT	Special Weather Statement	ABR	40 min
Aug 14, 6:51 PM MDT	Severe Thunderstorm Warning	ABR	39 min
Aug 14, 7:17 PM MDT	Severe Thunderstorm Warning	ABR	58 min
Aug 14, 8:04 PM MDT	Mesoscale Discussion	SPC	56 min
Aug 15, 8:08 PM MDT	Special Weather Statement	ABR	52 min
Aug 30, 6:05 PM MDT	Special Weather Statement	ABR	55 min
Sep 1, 8:10 PM MDT	Wind Advisory	ABR	22 hr
Sep 24, 1:58 PM MDT	Wind Advisory	ABR	28 hr
Oct 3, 2:19 AM MDT	Wind Advisory	ABR	16 hr
Oct 3, 4:54 PM MDT	Mesoscale Discussion	SPC	2 hr
Oct 3, 5:37 PM MDT	Severe Thunderstorm Warning	ABR	71 min
Oct 3, 6:30 PM MDT	Special Weather Statement	ABR	60 min
Oct 5, 1:37 AM MDT	Wind Advisory	ABR	16 hr
Oct 5, 2:16 PM MDT	Frost Advisory	ABR	19 hr
Oct 6, 2:06 PM MDT	Freeze Warning	ABR	19 hr
Oct 30, 1:55 PM MDT	Wind Advisory	ABR	28 hr
Nov 16, 2:39 AM MST	Winter Storm Watch	ABR	24 hr
Nov 17, 2:53 AM MST	Winter Weather Advisory	ABR	32 hr
Nov 28, 2:38 AM MST	Winter Weather Advisory	ABR	56 hr
Dec 5, 3:08 AM MST	Winter Weather Advisory	ABR	50 hr
Dec 5, 2:48 PM MST	Blizzard Warning	ABR	3 hr
Dec 7, 1:23 PM MST	Wind Chill Advisory	ABR	22 hr
Dec 12, 2:50 PM MST	Wind Chill Advisory	ABR	18 hr
Dec 14, 1:43 AM MST	Winter Storm Watch	ABR	36 hr
Dec 15, 3:25 AM MST	Winter Storm Warning	ABR	52 hr
Dec 16, 2:37 AM MST	Wind Chill Warning	ABR	56 hr
Dec 16, 9:07 AM MST	Mesoscale Discussion	SPC	6 hr
Dec 20, 2:22 PM MST	Wind Advisory	ABR	26 hr
Dec 22, 3:53 AM MST	Blizzard Watch	ABR	34 hr
Dec 23, 2:06 PM MST	Blizzard Warning	ABR	72 hr
Dec 25, 11:56 AM MST	Mesoscale Discussion	SPC	5 hr
Dec 26, 11:05 AM MST	Blizzard Warning	ABR	3 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	50
Severe Thunderstorm Watch	15
Tornado Watch	1
Mesoscale Discussion	32
Special Weather Statement	19
Flooding
Flash Flood Warning	2
Winter
Blizzard Warning	3
Winter Storm Warning	2
Blizzard Watch	1
Winter Storm Watch	2
Freezing Rain Advisory	1
Winter Weather Advisory	5
Heat
Excessive Heat Warning	1
Excessive Heat Watch	1
Heat Advisory	2
Cold
Freeze Warning	2
Wind Chill Warning	1
Frost Advisory	2
Wind Chill Advisory	3
Wind and dust
High Wind Warning	2
High Wind Watch	2
Wind Advisory	11
Fog and smoke
Dense Fog Advisory	1

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2015 2017

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.