Alert archive / South Dakota / Pennington County

Weather alerts in Pennington County, South Dakota, 2021

242 weather alerts in 2021, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Pennington County and its neighbors

Each county as a circle sized by its count in 2021. Tap one for its archive.

Alerts: 242
Warnings: 102
Watches: 40
Advisories: 46
Busiest month: June40 alerts
Busiest day: May 23, 20219 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 Pennington County in 2021 had a tornado report inside them.

Pennington County, 2021

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	1	0	100%	0
Severe thunderstorm warnings	57	46	19%	65	83%	25 min
Flash flood warnings	0			0

Each office's whole area, 2021

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Rapid City, SD: tornado warnings	5	3	40%	7	86%	22 min
NWS Rapid City, SD: severe thunderstorm warnings	212	171	19%	380	79%	26 min
NWS Rapid City, SD: flash flood warnings	2	0	100%	0

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 5, 2:45 AM MST	Wind Advisory	UNR	15 hr
Jan 11, 1:23 PM MST	High Wind Watch	UNR	37 hr
Jan 13, 2:14 AM MST	High Wind Warning	UNR	58 hr
Jan 16, 1:53 PM MST	Winter Storm Watch	UNR	12 hr
Jan 16, 3:34 PM MST	Special Weather Statement	UNR	41 min
Jan 17, 1:39 AM MST	Winter Storm Warning	UNR	39 hr
Jan 17, 1:39 AM MST	Winter Weather Advisory	UNR	39 hr
Jan 25, 2:08 AM MST	Dense Fog Advisory	UNR	7 hr
Jan 29, 8:49 PM MST	Dense Fog Advisory	UNR	14 hr
Feb 3, 2:43 AM MST	Wind Advisory	UNR	17 hr
Feb 4, 3:15 AM MST	Winter Weather Advisory	UNR	28 hr
Feb 5, 6:44 PM MST	Winter Weather Advisory	UNR	13 hr
Feb 7, 8:10 PM MST	Wind Chill Advisory	UNR	39 hr
Feb 9, 1:32 PM MST	Wind Chill Advisory	UNR	4 days
Feb 11, 1:50 PM MST	Wind Chill Warning	UNR	5 days
Feb 15, 1:10 PM MST	Wind Chill Advisory	UNR	19 hr
Feb 21, 1:41 PM MST	High Wind Warning	UNR	27 hr
Feb 21, 1:41 PM MST	Wind Advisory	UNR	27 hr
Feb 22, 2:23 PM MST	Wind Advisory	UNR	27 hr
Feb 24, 8:00 AM MST	Special Weather Statement	UNR	45 min
Feb 26, 2:00 PM MST	Winter Weather Advisory	UNR	39 hr
Feb 27, 6:02 AM MST	Winter Storm Warning	UNR	23 hr
Mar 5, 2:20 AM MST	Fire Weather Watch	UNR	11 hr
Mar 5, 12:59 PM MST	Red Flag Warning	UNR	30 hr
Mar 8, 3:24 AM MST	Winter Storm Watch	UNR	23 hr
Mar 9, 2:08 AM MST	Winter Storm Warning	UNR	39 hr
Mar 9, 2:08 AM MST	Winter Weather Advisory	UNR	41 hr
Mar 10, 12:12 AM MST	Mesoscale Discussion	SPC	6 hr
Mar 11, 8:08 PM MST	Winter Storm Watch	UNR	30 hr
Mar 12, 1:44 PM MST	Winter Storm Warning	UNR	66 hr
Mar 13, 1:35 PM MST	Blizzard Warning	UNR	27 hr
Mar 14, 5:20 PM MDT	Mesoscale Discussion	SPC	6 hr
Mar 26, 2:00 PM MDT	Fire Weather Watch	UNR	37 hr
Mar 27, 2:24 AM MDT	High Wind Watch	UNR	36 hr
Mar 27, 1:56 PM MDT	Red Flag Warning	UNR	3 days
Mar 28, 2:23 AM MDT	High Wind Warning	UNR	46 hr
Mar 28, 1:59 PM MDT	Red Flag Warning	UNR	54 hr
Mar 29, 2:45 PM MDT	Wind Advisory	UNR	29 hr
Mar 31, 3:01 AM MDT	Fire Weather Watch	UNR	11 hr
Mar 31, 1:37 PM MDT	Red Flag Warning	UNR	53 hr
Apr 1, 2:16 PM MDT	Red Flag Warning	UNR	29 hr
Apr 3, 2:34 AM MDT	Red Flag Warning	UNR	16 hr
Apr 4, 2:06 PM MDT	Winter Storm Watch	UNR	24 hr
Apr 5, 3:13 AM MDT	Red Flag Warning	UNR	16 hr
Apr 5, 1:58 PM MDT	Winter Storm Warning	UNR	36 hr
Apr 6, 2:41 AM MDT	Winter Weather Advisory	UNR	27 hr
Apr 7, 1:29 PM MDT	Winter Storm Watch	UNR	14 hr
Apr 8, 3:22 AM MDT	Winter Storm Warning	UNR	29 hr
Apr 8, 2:31 PM MDT	Wind Advisory	UNR	25 hr
Apr 9, 1:43 AM MDT	High Wind Warning	UNR	12 hr
Apr 10, 2:37 AM MDT	High Wind Watch	UNR	12 hr
Apr 10, 2:27 PM MDT	High Wind Warning	UNR	16 hr
Apr 10, 2:27 PM MDT	Wind Advisory	UNR	3 days
Apr 14, 2:55 AM MDT	Winter Weather Advisory	UNR	48 hr
Apr 17, 2:26 AM MDT	Winter Storm Watch	UNR	24 hr
Apr 18, 2:32 AM MDT	Winter Storm Warning	UNR	33 hr
Apr 18, 2:32 AM MDT	Winter Weather Advisory	UNR	54 hr
Apr 29, 2:23 AM MDT	Fire Weather Watch	UNR	24 hr
Apr 29, 2:23 PM MDT	Red Flag Warning	UNR	30 hr
May 5, 12:23 PM MDT	Special Weather Statement	UNR	37 min
May 12, 2:34 PM MDT	Special Weather Statement	UNR	41 min
May 20, 7:43 PM MDT	Special Weather Statement	UNR	47 min
May 20, 10:38 PM MDT	Special Weather Statement	UNR	37 min
May 20, 10:58 PM MDT	Severe Thunderstorm Warning	UNR	47 min
May 20, 11:41 PM MDT	Severe Thunderstorm Warning	UNR	49 min
May 21, 3:24 AM MDT	Special Weather Statement	UNR	66 min
May 21, 8:42 PM MDT	Severe Thunderstorm Warning	UNR	31 min
May 23, 12:58 PM MDT	Mesoscale Discussion	SPC	2 hr
May 23, 1:50 PM MDT	Tornado Watch	SPC	7 hr
May 23, 2:16 PM MDT	Special Weather Statement	UNR	29 min
May 23, 4:14 PM MDT	Tornado Warning	UNR	13 min
May 23, 4:26 PM MDT	Severe Thunderstorm Warning	UNR	49 min
May 23, 4:26 PM MDT	Severe Thunderstorm Warning	UNR	33 min
May 23, 5:04 PM MDT	Severe Thunderstorm Warning	UNR	30 min
May 23, 5:25 PM MDT	Mesoscale Discussion	SPC	95 min
May 23, 5:53 PM MDT	Severe Thunderstorm Warning	UNR	67 min
Jun 7, 2:49 PM MDT	Mesoscale Discussion	SPC	116 min
Jun 7, 4:36 PM MDT	Severe Thunderstorm Warning	UNR	54 min
Jun 8, 2:20 PM MDT	Severe Thunderstorm Warning	UNR	55 min
Jun 8, 2:24 PM MDT	Mesoscale Discussion	SPC	96 min
Jun 8, 6:37 PM MDT	Mesoscale Discussion	SPC	83 min
Jun 8, 7:00 PM MDT	Severe Thunderstorm Watch	SPC	5 hr
Jun 8, 7:46 PM MDT	Severe Thunderstorm Warning	UNR	59 min
Jun 8, 8:41 PM MDT	Severe Thunderstorm Warning	UNR	64 min
Jun 8, 8:50 PM MDT	Mesoscale Discussion	SPC	85 min
Jun 8, 9:38 PM MDT	Special Weather Statement	UNR	52 min
Jun 8, 10:14 PM MDT	Special Weather Statement	UNR	61 min
Jun 10, 2:51 PM MDT	Mesoscale Discussion	SPC	114 min
Jun 10, 3:01 PM MDT	Wind Advisory	UNR	15 hr
Jun 10, 7:28 PM MDT	Mesoscale Discussion	SPC	92 min
Jun 10, 8:08 PM MDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 10, 10:07 PM MDT	Mesoscale Discussion	SPC	83 min
Jun 10, 10:18 PM MDT	Severe Thunderstorm Warning	UNR	57 min
Jun 10, 10:24 PM MDT	Severe Thunderstorm Warning	UNR	51 min
Jun 10, 10:32 PM MDT	Severe Thunderstorm Warning	UNR	43 min
Jun 10, 10:50 PM MDT	Mesoscale Discussion	SPC	85 min
Jun 10, 11:05 PM MDT	Severe Thunderstorm Warning	UNR	70 min
Jun 10, 11:12 PM MDT	Severe Thunderstorm Warning	UNR	63 min
Jun 13, 1:16 PM MDT	Mesoscale Discussion	SPC	89 min
Jun 14, 11:01 PM MDT	Severe Thunderstorm Warning	UNR	44 min
Jun 15, 2:49 AM MDT	Severe Thunderstorm Warning	UNR	56 min
Jun 16, 2:22 AM MDT	Wind Advisory	UNR	13 hr
Jun 19, 3:58 PM MDT	Mesoscale Discussion	SPC	92 min
Jun 19, 5:53 PM MDT	Severe Thunderstorm Warning	UNR	32 min
Jun 19, 6:10 PM MDT	Severe Thunderstorm Warning	UNR	65 min
Jun 19, 6:52 PM MDT	Special Weather Statement	UNR	38 min
Jun 19, 6:57 PM MDT	Severe Thunderstorm Warning	UNR	30 min
Jun 19, 7:28 PM MDT	Special Weather Statement	UNR	62 min
Jun 19, 7:48 PM MDT	Severe Thunderstorm Warning	UNR	57 min
Jun 19, 8:06 PM MDT	Severe Thunderstorm Warning	UNR	54 min
Jun 23, 6:42 PM MDT	Special Weather Statement	UNR	48 min
Jun 23, 10:59 PM MDT	Special Weather Statement	UNR	61 min
Jun 24, 1:46 PM MDT	Special Weather Statement	UNR	44 min
Jun 24, 5:30 PM MDT	Severe Thunderstorm Warning	UNR	16 min
Jun 27, 12:04 PM MDT	Special Weather Statement	UNR	26 min
Jun 27, 12:52 PM MDT	Special Weather Statement	UNR	23 min
Jul 3, 12:44 PM MDT	Severe Thunderstorm Warning	UNR	35 min
Jul 5, 12:34 PM MDT	Mesoscale Discussion	SPC	116 min
Jul 5, 2:50 PM MDT	Special Weather Statement	UNR	25 min
Jul 5, 4:54 PM MDT	Severe Thunderstorm Warning	UNR	36 min
Jul 5, 5:19 PM MDT	Severe Thunderstorm Warning	UNR	56 min
Jul 5, 6:11 PM MDT	Severe Thunderstorm Warning	UNR	64 min
Jul 6, 8:21 PM MDT	Special Weather Statement	UNR	24 min
Jul 8, 3:49 PM MDT	Severe Thunderstorm Watch	SPC	6 hr
Jul 8, 5:26 PM MDT	Severe Thunderstorm Warning	UNR	64 min
Jul 8, 6:08 PM MDT	Mesoscale Discussion	SPC	97 min
Jul 8, 6:14 PM MDT	Severe Thunderstorm Warning	UNR	61 min
Jul 9, 3:57 PM MDT	Severe Thunderstorm Warning	UNR	12 min
Jul 9, 5:33 PM MDT	Severe Thunderstorm Watch	SPC	4 hr
Jul 9, 7:25 PM MDT	Severe Thunderstorm Warning	UNR	35 min
Jul 10, 5:07 AM MDT	Special Weather Statement	UNR	38 min
Jul 13, 2:21 PM MDT	Mesoscale Discussion	SPC	84 min
Jul 13, 4:25 PM MDT	Severe Thunderstorm Watch	SPC	8 hr
Jul 13, 9:58 PM MDT	Severe Thunderstorm Warning	UNR	62 min
Jul 13, 10:30 PM MDT	Mesoscale Discussion	SPC	90 min
Jul 13, 10:43 PM MDT	Special Weather Statement	UNR	47 min
Jul 13, 10:56 PM MDT	Severe Thunderstorm Warning	UNR	51 min
Jul 14, 12:21 AM MDT	Special Weather Statement	UNR	54 min
Jul 16, 2:16 PM MDT	Mesoscale Discussion	SPC	119 min
Jul 16, 3:55 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 16, 3:55 PM MDT	Severe Thunderstorm Warning	UNR	65 min
Jul 16, 4:32 PM MDT	Severe Thunderstorm Warning	UNR	58 min
Jul 16, 5:05 PM MDT	Severe Thunderstorm Warning	UNR	45 min
Jul 16, 5:31 PM MDT	Severe Thunderstorm Warning	UNR	44 min
Jul 16, 6:20 PM MDT	Severe Thunderstorm Warning	UNR	55 min
Jul 17, 2:40 PM MDT	Mesoscale Discussion	SPC	3 hr
Jul 21, 12:47 PM MDT	Severe Thunderstorm Warning	UNR	31 min
Jul 21, 3:11 PM MDT	Special Weather Statement	UNR	49 min
Jul 22, 5:47 PM MDT	Special Weather Statement	UNR	58 min
Jul 26, 2:03 AM MDT	Heat Advisory	UNR	66 hr
Jul 31, 4:23 AM MDT	Dense Fog Advisory	UNR	5 hr
Aug 5, 4:47 PM MDT	Special Weather Statement	UNR	43 min
Aug 6, 1:43 PM MDT	Severe Thunderstorm Watch	SPC	6 hr
Aug 6, 2:24 PM MDT	Severe Thunderstorm Warning	UNR	36 min
Aug 6, 6:26 PM MDT	Special Weather Statement	UNR	64 min
Aug 6, 7:06 PM MDT	Severe Thunderstorm Warning	UNR	54 min
Aug 8, 9:07 PM MDT	Wind Advisory	UNR	6 hr
Aug 9, 3:36 AM MDT	Fire Weather Watch	UNR	24 hr
Aug 10, 3:10 AM MDT	Red Flag Warning	UNR	18 hr
Aug 14, 12:50 PM MDT	Mesoscale Discussion	SPC	115 min
Aug 14, 1:57 PM MDT	Severe Thunderstorm Warning	UNR	48 min
Aug 14, 2:37 PM MDT	Severe Thunderstorm Warning	UNR	53 min
Aug 14, 2:44 PM MDT	Severe Thunderstorm Warning	UNR	41 min
Aug 14, 3:18 PM MDT	Special Weather Statement	UNR	42 min
Aug 14, 3:28 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Aug 14, 3:30 PM MDT	Severe Thunderstorm Warning Considerable damage threat	UNR	60 min
Aug 14, 4:04 PM MDT	Severe Thunderstorm Warning	UNR	56 min
Aug 14, 4:40 PM MDT	Severe Thunderstorm Warning	UNR	31 min
Aug 16, 1:41 PM MDT	Fire Weather Watch	UNR	13 hr
Aug 16, 1:41 PM MDT	Red Flag Warning	UNR	30 hr
Aug 19, 3:05 PM MDT	Special Weather Statement	UNR	40 min
Aug 22, 2:12 PM MDT	Red Flag Warning	UNR	30 hr
Aug 22, 7:20 PM MDT	Fire Weather Watch	UNR	8 hr
Aug 26, 5:21 PM MDT	Severe Thunderstorm Warning	UNR	54 min
Aug 26, 5:59 PM MDT	Severe Thunderstorm Warning	UNR	61 min
Aug 26, 6:25 PM MDT	Mesoscale Discussion	SPC	2 hr
Aug 26, 6:54 PM MDT	Severe Thunderstorm Warning Considerable damage threat	UNR	66 min
Aug 26, 7:03 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Aug 26, 7:48 PM MDT	Severe Thunderstorm Warning Considerable damage threat	UNR	57 min
Aug 26, 8:38 PM MDT	Severe Thunderstorm Warning	UNR	52 min
Aug 26, 9:02 PM MDT	Special Weather Statement	UNR	58 min
Aug 30, 1:50 PM MDT	Mesoscale Discussion	SPC	115 min
Aug 30, 2:59 PM MDT	Severe Thunderstorm Warning	UNR	61 min
Aug 30, 3:03 PM MDT	Severe Thunderstorm Watch	SPC	6 hr
Aug 30, 4:09 PM MDT	Severe Thunderstorm Warning	UNR	66 min
Aug 30, 8:30 PM MDT	Severe Thunderstorm Warning Considerable damage threat	UNR	60 min
Aug 30, 8:57 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Aug 30, 9:26 PM MDT	Severe Thunderstorm Warning	UNR	64 min
Sep 3, 2:59 PM MDT	Mesoscale Discussion	SPC	91 min
Sep 4, 1:39 PM MDT	Fire Weather Watch	UNR	24 hr
Sep 5, 1:44 PM MDT	Red Flag Warning	UNR	29 hr
Sep 7, 2:06 PM MDT	Fire Weather Watch	UNR	48 hr
Sep 9, 2:26 AM MDT	Red Flag Warning	UNR	41 hr
Sep 13, 5:58 AM MDT	Special Weather Statement	UNR	47 min
Sep 17, 2:44 AM MDT	Fire Weather Watch	UNR	11 hr
Sep 17, 1:17 PM MDT	Red Flag Warning	UNR	32 hr
Sep 19, 2:36 AM MDT	Wind Advisory	UNR	23 hr
Sep 19, 10:15 AM MDT	High Wind Warning	UNR	14 hr
Sep 23, 1:58 PM MDT	Fire Weather Watch	UNR	12 hr
Sep 27, 1:45 AM MDT	Fire Weather Watch	UNR	11 hr
Sep 27, 1:01 PM MDT	Red Flag Warning	UNR	30 hr
Sep 28, 7:03 PM MDT	Wind Advisory	UNR	19 hr
Oct 5, 1:49 PM MDT	Fire Weather Watch	UNR	13 hr
Oct 6, 2:36 AM MDT	Red Flag Warning	UNR	16 hr
Oct 9, 2:12 AM MDT	Wind Advisory	UNR	24 hr
Oct 10, 1:49 AM MDT	Winter Storm Watch	UNR	37 hr
Oct 11, 3:07 PM MDT	Winter Storm Warning	UNR	51 hr
Oct 11, 3:07 PM MDT	Winter Weather Advisory	UNR	44 hr
Oct 12, 2:03 PM MDT	High Wind Warning	UNR	29 hr
Oct 12, 2:03 PM MDT	Wind Advisory	UNR	28 hr
Oct 13, 2:45 PM MDT	Freeze Warning	UNR	18 hr
Oct 18, 1:40 PM MDT	Winter Weather Advisory	UNR	40 hr
Oct 19, 3:04 AM MDT	Wind Advisory	UNR	15 hr
Oct 25, 1:33 AM MDT	Dense Fog Advisory	UNR	7 hr
Oct 26, 2:23 AM MDT	Wind Advisory	UNR	20 hr
Oct 30, 1:38 AM MDT	Wind Advisory	UNR	10 hr
Nov 10, 1:01 AM MST	Wind Advisory	UNR	16 hr
Nov 10, 8:03 AM MST	High Wind Warning	UNR	39 hr
Nov 10, 1:10 PM MST	Wind Advisory	UNR	40 hr
Nov 11, 8:57 PM MST	Wind Advisory	UNR	16 hr
Nov 12, 1:20 PM MST	High Wind Watch	UNR	13 hr
Nov 13, 2:05 AM MST	High Wind Warning	UNR	18 hr
Nov 13, 2:05 AM MST	Wind Advisory	UNR	18 hr
Nov 15, 1:46 AM MST	Fire Weather Watch	UNR	13 hr
Nov 15, 2:25 PM MST	High Wind Warning	UNR	51 hr
Nov 15, 2:28 PM MST	Red Flag Warning	UNR	27 hr
Nov 15, 8:23 PM MST	Wind Advisory	UNR	18 hr
Nov 16, 1:56 AM MST	Wind Advisory	UNR	17 hr
Nov 16, 2:41 PM MST	Wind Advisory	UNR	26 hr
Nov 22, 1:05 AM MST	Fire Weather Watch	UNR	12 hr
Nov 22, 1:25 PM MST	Red Flag Warning	UNR	28 hr
Dec 4, 2:00 AM MST	High Wind Watch	UNR	12 hr
Dec 4, 2:04 PM MST	High Wind Warning	UNR	27 hr
Dec 9, 2:10 AM MST	Winter Storm Warning	UNR	39 hr
Dec 9, 2:10 AM MST	Winter Weather Advisory	UNR	36 hr
Dec 13, 12:35 PM MST	High Wind Warning	UNR	25 hr
Dec 14, 2:33 AM MST	High Wind Warning	UNR	42 hr
Dec 14, 1:45 PM MST	Winter Weather Advisory	UNR	30 hr
Dec 17, 2:09 AM MST	Wind Advisory	UNR	16 hr
Dec 22, 1:23 PM MST	High Wind Watch	UNR	20 hr
Dec 23, 2:23 AM MST	High Wind Warning	UNR	26 hr
Dec 23, 9:51 AM MST	Wind Advisory	UNR	18 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	57
Tornado Warning	1
Severe Thunderstorm Watch	11
Tornado Watch	1
Mesoscale Discussion	24
Special Weather Statement	30
Winter
Blizzard Warning	1
Winter Storm Warning	9
Winter Storm Watch	7
Winter Weather Advisory	12
Heat
Heat Advisory	1
Cold
Freeze Warning	1
Wind Chill Warning	1
Wind Chill Advisory	3
Wind and dust
High Wind Warning	14
High Wind Watch	6
Wind Advisory	26
Fire
Red Flag Warning	18
Fire Weather Watch	15
Fog and smoke
Dense Fog Advisory	4

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2020 2022

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.