Alert archive / South Dakota / Custer County

Weather alerts in Custer County, South Dakota, 2020

212 weather alerts in 2020, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Custer County and its neighbors

Each county as a circle sized by its count in 2020. Tap one for its archive.

Alerts: 212
Warnings: 85
Watches: 38
Advisories: 31
Busiest month: July64 alerts
Busiest day: July 2, 20209 alerts

Over time

By month

Warning verification

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

Custer County, 2020

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	0			0
Severe thunderstorm warnings	58	50	14%	48	92%	21 min
Flash flood warnings	0			0

Each office's whole area, 2020

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Rapid City, SD: tornado warnings	11	2	82%	11	27%	18 min
NWS Rapid City, SD: severe thunderstorm warnings	415	336	19%	828	89%	27 min
NWS Rapid City, SD: flash flood warnings	10	7	30%	11	91%	88 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 1, 2:52 AM MST	Wind Advisory	UNR	11 hr
Jan 30, 1:38 AM MST	Winter Weather Advisory	UNR	15 hr
Jan 31, 1:46 PM MST	Winter Storm Watch	UNR	37 hr
Feb 1, 2:27 PM MST	Winter Storm Warning	UNR	57 hr
Feb 2, 2:37 AM MST	Winter Weather Advisory	UNR	44 hr
Feb 5, 2:05 PM MST	Winter Weather Advisory	UNR	39 hr
Feb 14, 11:17 AM MST	Wind Advisory	UNR	4 hr
Feb 23, 2:01 PM MST	Winter Storm Warning	UNR	48 hr
Feb 24, 2:28 AM MST	Winter Weather Advisory	UNR	36 hr
Mar 3, 1:50 AM MST	Wind Advisory	UNR	15 hr
Mar 5, 2:00 PM MST	Fire Weather Watch	UNR	36 hr
Mar 7, 2:19 AM MST	Red Flag Warning	UNR	16 hr
Mar 10, 2:39 PM MDT	Fire Weather Watch	UNR	12 hr
Mar 11, 2:53 AM MDT	Red Flag Warning	UNR	16 hr
Mar 12, 2:10 PM MDT	Winter Storm Watch	UNR	13 hr
Mar 13, 3:13 AM MDT	Winter Storm Warning	UNR	29 hr
Mar 13, 3:13 AM MDT	Winter Weather Advisory	UNR	32 hr
Mar 31, 3:46 AM MDT	Winter Storm Watch	UNR	24 hr
Mar 31, 4:32 AM MDT	Dense Fog Advisory	UNR	3 hr
Mar 31, 2:05 PM MDT	Winter Weather Advisory	UNR	58 hr
Apr 1, 3:48 AM MDT	Winter Storm Warning	UNR	31 hr
Apr 5, 1:56 PM MDT	Fire Weather Watch	UNR	15 hr
Apr 6, 4:30 AM MDT	Red Flag Warning	UNR	38 hr
Apr 9, 2:02 AM MDT	Winter Storm Watch	UNR	37 hr
Apr 10, 2:35 PM MDT	Winter Storm Warning	UNR	42 hr
Apr 10, 2:35 PM MDT	Winter Weather Advisory	UNR	39 hr
Apr 16, 7:47 PM MDT	Winter Weather Advisory	UNR	118 min
Apr 27, 1:44 PM MDT	Wind Advisory	UNR	30 hr
Apr 30, 7:22 PM MDT	Special Weather Statement	UNR	38 min
Apr 30, 7:41 PM MDT	Special Weather Statement	UNR	49 min
May 3, 1:32 PM MDT	Wind Advisory	UNR	25 hr
May 3, 4:14 PM MDT	Severe Thunderstorm Warning	UNR	61 min
May 3, 5:15 PM MDT	Severe Thunderstorm Warning	UNR	60 min
May 3, 5:19 PM MDT	Severe Thunderstorm Warning	UNR	41 min
May 3, 6:07 PM MDT	Severe Thunderstorm Warning	UNR	38 min
May 3, 6:44 PM MDT	Severe Thunderstorm Warning	UNR	61 min
May 8, 1:44 PM MDT	Wind Advisory	UNR	30 hr
May 13, 10:16 PM MDT	Special Weather Statement	UNR	29 min
May 13, 10:43 PM MDT	Special Weather Statement	UNR	32 min
May 20, 1:07 PM MDT	Mesoscale Discussion	SPC	83 min
May 20, 2:22 PM MDT	Severe Thunderstorm Watch	SPC	8 hr
May 20, 5:25 PM MDT	Mesoscale Discussion	SPC	95 min
May 20, 5:42 PM MDT	Severe Thunderstorm Warning	UNR	48 min
May 23, 11:24 AM MDT	Flash Flood Watch	UNR	10 hr
May 23, 12:48 PM MDT	Mesoscale Discussion	SPC	117 min
May 23, 1:15 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
May 23, 2:57 PM MDT	Mesoscale Discussion	SPC	93 min
May 23, 5:27 PM MDT	Mesoscale Discussion	SPC	93 min
May 29, 10:26 PM MDT	Special Weather Statement	UNR	49 min
May 31, 3:43 PM MDT	Mesoscale Discussion	SPC	2 hr
May 31, 3:45 PM MDT	Severe Thunderstorm Warning	UNR	25 min
May 31, 4:07 PM MDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 2, 6:35 PM MDT	Mesoscale Discussion	SPC	85 min
Jun 3, 12:35 PM MDT	Mesoscale Discussion	SPC	85 min
Jun 3, 1:05 PM MDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 4, 1:25 PM MDT	Mesoscale Discussion	SPC	95 min
Jun 4, 2:27 PM MDT	Severe Thunderstorm Watch	SPC	8 hr
Jun 4, 5:55 PM MDT	Mesoscale Discussion	SPC	95 min
Jun 4, 7:07 PM MDT	Severe Thunderstorm Warning	UNR	53 min
Jun 4, 8:29 PM MDT	Severe Thunderstorm Warning	UNR	61 min
Jun 4, 8:46 PM MDT	Severe Thunderstorm Warning	UNR	59 min
Jun 5, 7:01 PM MDT	Mesoscale Discussion	SPC	119 min
Jun 6, 2:33 PM MDT	Mesoscale Discussion	SPC	117 min
Jun 6, 4:49 PM MDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 6, 5:09 PM MDT	Severe Thunderstorm Warning	UNR	66 min
Jun 6, 5:25 PM MDT	Mesoscale Discussion	SPC	95 min
Jun 6, 5:56 PM MDT	Severe Thunderstorm Warning	UNR	49 min
Jun 6, 6:42 PM MDT	Severe Thunderstorm Warning	UNR	63 min
Jun 6, 6:45 PM MDT	Severe Thunderstorm Warning	UNR	60 min
Jun 16, 8:20 PM MDT	Special Weather Statement	UNR	40 min
Jun 21, 1:05 PM MDT	Mesoscale Discussion	SPC	2 hr
Jun 21, 6:26 PM MDT	Severe Thunderstorm Warning	UNR	29 min
Jun 21, 7:02 PM MDT	Special Weather Statement	UNR	58 min
Jun 25, 12:58 PM MDT	Severe Thunderstorm Warning	UNR	62 min
Jun 25, 1:16 PM MDT	Severe Thunderstorm Warning	UNR	59 min
Jun 25, 2:04 PM MDT	Areal Flood Advisory	UNR	3 hr
Jun 25, 2:27 PM MDT	Special Weather Statement	UNR	48 min
Jun 25, 4:07 PM MDT	Special Weather Statement	UNR	23 min
Jun 25, 10:15 PM MDT	Special Weather Statement	UNR	30 min
Jun 28, 1:39 PM MDT	Severe Thunderstorm Watch	SPC	8 hr
Jun 28, 5:18 PM MDT	Mesoscale Discussion	SPC	117 min
Jun 28, 6:50 PM MDT	Severe Thunderstorm Warning	UNR	55 min
Jun 28, 7:18 PM MDT	Severe Thunderstorm Warning	UNR	42 min
Jun 28, 7:38 PM MDT	Severe Thunderstorm Warning	UNR	67 min
Jul 1, 4:00 AM MDT	Red Flag Warning	UNR	16 hr
Jul 2, 11:59 AM MDT	Mesoscale Discussion	SPC	91 min
Jul 2, 1:15 PM MDT	Severe Thunderstorm Watch	SPC	9 hr
Jul 2, 1:54 PM MDT	Special Weather Statement	UNR	36 min
Jul 2, 2:06 PM MDT	Severe Thunderstorm Warning	UNR	54 min
Jul 2, 2:57 PM MDT	Severe Thunderstorm Warning	UNR	63 min
Jul 2, 2:59 PM MDT	Severe Thunderstorm Warning	UNR	19 min
Jul 2, 3:25 PM MDT	Severe Thunderstorm Warning	UNR	49 min
Jul 2, 3:58 PM MDT	Severe Thunderstorm Warning	UNR	62 min
Jul 2, 5:16 PM MDT	Severe Thunderstorm Warning	UNR	26 min
Jul 3, 10:00 PM MDT	Severe Thunderstorm Warning	UNR	32 min
Jul 3, 10:20 PM MDT	Severe Thunderstorm Warning	UNR	28 min
Jul 3, 10:50 PM MDT	Special Weather Statement	UNR	40 min
Jul 4, 2:36 PM MDT	Special Weather Statement	UNR	39 min
Jul 4, 3:28 PM MDT	Special Weather Statement	UNR	47 min
Jul 4, 3:52 PM MDT	Severe Thunderstorm Warning	UNR	53 min
Jul 5, 3:00 PM MDT	Mesoscale Discussion	SPC	2 hr
Jul 5, 4:07 PM MDT	Severe Thunderstorm Warning	UNR	68 min
Jul 5, 4:13 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 5, 6:24 PM MDT	Mesoscale Discussion	SPC	66 min
Jul 5, 7:09 PM MDT	Severe Thunderstorm Warning	UNR	66 min
Jul 5, 7:20 PM MDT	Severe Thunderstorm Warning	UNR	55 min
Jul 5, 8:00 PM MDT	Severe Thunderstorm Warning	UNR	60 min
Jul 6, 1:55 PM MDT	Fire Weather Watch	UNR	13 hr
Jul 6, 2:45 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 6, 5:14 PM MDT	Mesoscale Discussion	SPC	91 min
Jul 6, 7:58 PM MDT	Severe Thunderstorm Warning	UNR	62 min
Jul 7, 3:07 AM MDT	Red Flag Warning	UNR	17 hr
Jul 7, 2:35 PM MDT	Fire Weather Watch	UNR	12 hr
Jul 7, 2:50 PM MDT	Mesoscale Discussion	SPC	85 min
Jul 7, 4:23 PM MDT	Special Weather Statement	UNR	37 min
Jul 7, 4:44 PM MDT	Special Weather Statement	UNR	46 min
Jul 7, 6:46 PM MDT	Severe Thunderstorm Warning	UNR	44 min
Jul 9, 1:43 AM MDT	Severe Thunderstorm Warning	UNR	47 min
Jul 9, 2:11 AM MDT	Severe Thunderstorm Warning	UNR	64 min
Jul 9, 3:20 AM MDT	Severe Thunderstorm Warning	UNR	55 min
Jul 9, 12:51 PM MDT	Mesoscale Discussion	SPC	114 min
Jul 9, 2:33 PM MDT	Fire Weather Watch	UNR	12 hr
Jul 9, 3:42 PM MDT	Special Weather Statement	UNR	33 min
Jul 9, 3:53 PM MDT	Severe Thunderstorm Warning	UNR	53 min
Jul 9, 4:12 PM MDT	Severe Thunderstorm Warning	UNR	63 min
Jul 10, 12:39 AM MDT	Special Weather Statement	UNR	51 min
Jul 10, 12:43 AM MDT	Severe Thunderstorm Warning	UNR	35 min
Jul 10, 2:26 AM MDT	Red Flag Warning	UNR	17 hr
Jul 10, 12:26 PM MDT	Mesoscale Discussion	SPC	2 hr
Jul 10, 2:43 PM MDT	Mesoscale Discussion	SPC	2 hr
Jul 10, 4:56 PM MDT	Severe Thunderstorm Warning	UNR	64 min
Jul 10, 5:25 PM MDT	Severe Thunderstorm Warning	UNR	33 min
Jul 10, 5:31 PM MDT	Severe Thunderstorm Warning	UNR	59 min
Jul 10, 6:00 PM MDT	Special Weather Statement	UNR	45 min
Jul 16, 3:13 AM MDT	Fire Weather Watch	UNR	16 hr
Jul 16, 7:39 PM MDT	Red Flag Warning	UNR	24 hr
Jul 19, 2:50 PM MDT	Mesoscale Discussion	SPC	115 min
Jul 19, 4:06 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 19, 6:31 PM MDT	Severe Thunderstorm Warning	UNR	59 min
Jul 19, 6:48 PM MDT	Mesoscale Discussion	SPC	117 min
Jul 20, 12:13 PM MDT	Severe Thunderstorm Watch	SPC	6 hr
Jul 20, 2:01 PM MDT	Special Weather Statement	UNR	44 min
Jul 20, 2:19 PM MDT	Mesoscale Discussion	SPC	116 min
Jul 20, 2:25 PM MDT	Severe Thunderstorm Warning	UNR	50 min
Jul 20, 2:42 PM MDT	Severe Thunderstorm Warning	UNR	48 min
Jul 20, 3:01 PM MDT	Severe Thunderstorm Warning	UNR	44 min
Jul 23, 2:55 AM MDT	Red Flag Warning	UNR	17 hr
Jul 27, 1:54 PM MDT	Flash Flood Watch	UNR	56 hr
Aug 1, 1:48 PM MDT	Special Weather Statement	UNR	42 min
Aug 1, 4:36 PM MDT	Areal Flood Advisory	UNR	3 hr
Aug 6, 5:13 PM MDT	Mesoscale Discussion	SPC	2 hr
Aug 6, 7:31 PM MDT	Mesoscale Discussion	SPC	59 min
Aug 7, 5:46 PM MDT	Special Weather Statement	UNR	44 min
Aug 8, 1:31 PM MDT	Mesoscale Discussion	SPC	119 min
Aug 8, 4:57 PM MDT	Severe Thunderstorm Warning	UNR	35 min
Aug 8, 5:00 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Aug 8, 5:05 PM MDT	Severe Thunderstorm Warning	UNR	28 min
Aug 8, 6:16 PM MDT	Severe Thunderstorm Warning	UNR	44 min
Aug 8, 6:45 PM MDT	Severe Thunderstorm Warning	UNR	45 min
Aug 8, 7:26 PM MDT	Severe Thunderstorm Warning	UNR	64 min
Aug 11, 4:53 PM MDT	Special Weather Statement	UNR	37 min
Aug 11, 5:42 PM MDT	Severe Thunderstorm Warning	UNR	18 min
Aug 12, 3:40 AM MDT	Fire Weather Watch	UNR	10 hr
Aug 12, 3:40 AM MDT	Red Flag Warning	UNR	40 hr
Aug 13, 6:57 PM MDT	Wind Advisory	UNR	14 hr
Aug 20, 4:49 PM MDT	Special Weather Statement	UNR	41 min
Aug 25, 2:01 AM MDT	Heat Advisory	UNR	17 hr
Aug 26, 4:29 PM MDT	Severe Thunderstorm Warning	UNR	61 min
Aug 27, 5:28 AM MDT	Special Weather Statement	UNR	47 min
Aug 27, 4:52 PM MDT	Mesoscale Discussion	SPC	83 min
Aug 27, 5:31 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Aug 27, 7:11 PM MDT	Special Weather Statement	UNR	64 min
Aug 27, 8:20 PM MDT	Mesoscale Discussion	SPC	85 min
Aug 27, 9:01 PM MDT	Severe Thunderstorm Warning	UNR	59 min
Aug 29, 8:14 PM MDT	Severe Thunderstorm Warning	UNR	44 min
Aug 29, 8:43 PM MDT	Severe Thunderstorm Warning	UNR	27 min
Aug 30, 2:23 AM MDT	Wind Advisory	UNR	17 hr
Aug 30, 1:40 PM MDT	Fire Weather Watch	UNR	48 hr
Sep 1, 2:59 AM MDT	Red Flag Warning	UNR	42 hr
Sep 3, 4:00 AM MDT	Fire Weather Watch	UNR	33 hr
Sep 4, 12:56 PM MDT	Red Flag Warning	UNR	54 hr
Sep 6, 2:21 AM MDT	Winter Storm Watch	UNR	24 hr
Sep 7, 2:37 AM MDT	Winter Storm Warning	UNR	28 hr
Sep 8, 2:34 AM MDT	Mesoscale Discussion	SPC	4 hr
Sep 8, 1:51 PM MDT	Freeze Warning	UNR	18 hr
Sep 12, 1:44 PM MDT	Fire Weather Watch	UNR	24 hr
Sep 13, 2:03 PM MDT	Red Flag Warning	UNR	30 hr
Sep 22, 2:03 PM MDT	Fire Weather Watch	UNR	36 hr
Sep 26, 7:32 PM MDT	Wind Advisory	UNR	23 hr
Sep 29, 1:34 PM MDT	Wind Advisory	UNR	29 hr
Oct 7, 1:30 PM MDT	Red Flag Warning	UNR	29 hr
Oct 9, 3:12 AM MDT	Fire Weather Watch	UNR	11 hr
Oct 9, 2:06 PM MDT	Red Flag Warning	UNR	29 hr
Oct 13, 2:45 AM MDT	High Wind Watch	UNR	11 hr
Oct 13, 1:50 PM MDT	High Wind Warning	UNR	28 hr
Oct 14, 6:02 PM MDT	Wind Advisory	UNR	82 min
Oct 17, 2:43 AM MDT	Winter Weather Advisory	UNR	27 hr
Oct 22, 2:42 PM MDT	Winter Storm Watch	UNR	23 hr
Oct 23, 2:05 PM MDT	Winter Weather Advisory	UNR	47 hr
Nov 13, 2:26 AM MST	High Wind Warning	UNR	36 hr
Nov 13, 2:14 PM MST	Wind Advisory	UNR	32 hr
Nov 17, 2:15 AM MST	High Wind Watch	UNR	11 hr
Nov 17, 1:06 PM MST	High Wind Warning	UNR	16 hr
Nov 30, 2:30 PM MST	Wind Advisory	UNR	27 hr
Dec 20, 1:57 AM MST	Wind Advisory	UNR	17 hr
Dec 21, 1:43 PM MST	Winter Weather Advisory	UNR	24 hr
Dec 21, 1:45 PM MST	High Wind Watch	UNR	13 hr
Dec 22, 3:13 AM MST	High Wind Warning	UNR	34 hr
Dec 22, 1:25 PM MST	Winter Storm Warning	UNR	19 hr
Dec 22, 1:25 PM MST	Winter Weather Advisory	UNR	28 hr
Dec 23, 8:02 AM MST	High Wind Warning	UNR	5 hr
Dec 28, 3:06 AM MST	Winter Weather Advisory	UNR	37 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	58
Severe Thunderstorm Watch	14
Mesoscale Discussion	32
Special Weather Statement	26
Flooding
Flash Flood Watch	2
Areal Flood Advisory	2
Winter
Winter Storm Warning	7
Winter Storm Watch	6
Winter Weather Advisory	13
Heat
Heat Advisory	1
Cold
Freeze Warning	1
Wind and dust
High Wind Warning	5
High Wind Watch	3
Wind Advisory	14
Fire
Red Flag Warning	14
Fire Weather Watch	13
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 2019 2021

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.