Alert archive / South Dakota / Pennington County

Weather alerts in Pennington County, South Dakota, 2015

235 weather alerts in 2015, 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 2015. Tap one for its archive.

Alerts: 235
Warnings: 115
Watches: 22
Advisories: 40
Busiest month: June93 alerts
Busiest day: June 24, 201516 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 2015 had a tornado report inside them.

Pennington County, 2015

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	1	0	100%	0
Severe thunderstorm warnings	77	65	16%	79	85%	28 min
Flash flood warnings	4	1	75%	0

Each office's whole area, 2015

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Rapid City, SD: tornado warnings	16	5	69%	11	64%	14 min
NWS Rapid City, SD: severe thunderstorm warnings	307	238	22%	460	88%	26 min
NWS Rapid City, SD: flash flood warnings	18	9	50%	13	92%	99 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 3, 3:16 AM MST	Wind Advisory	UNR	12 hr
Jan 4, 2:38 PM MST	Winter Weather Advisory	UNR	29 hr
Jan 6, 2:58 AM MST	Wind Chill Advisory	UNR	31 hr
Jan 7, 2:40 PM MST	Winter Weather Advisory	UNR	29 hr
Jan 7, 2:41 PM MST	High Wind Warning	UNR	24 hr
Jan 8, 7:37 PM MST	Wind Chill Advisory	UNR	15 hr
Jan 16, 2:05 PM MST	Wind Advisory	UNR	24 hr
Jan 23, 2:32 PM MST	Wind Advisory	UNR	28 hr
Jan 24, 2:46 AM MST	High Wind Warning	UNR	16 hr
Jan 27, 1:55 PM MST	Wind Advisory	UNR	33 hr
Jan 31, 5:02 PM MST	Freezing Rain Advisory	UNR	4 hr
Feb 9, 12:10 AM MST	Dense Fog Advisory	UNR	10 hr
Feb 9, 6:32 PM MST	Dense Fog Advisory	UNR	8 hr
Feb 10, 2:39 AM MST	Wind Advisory	UNR	17 hr
Feb 16, 3:31 AM MST	Winter Weather Advisory	UNR	27 hr
Feb 17, 3:41 AM MST	Wind Advisory	UNR	14 hr
Feb 24, 3:50 AM MST	Winter Weather Advisory	UNR	44 hr
Feb 25, 3:43 AM MST	Wind Advisory	UNR	11 hr
Feb 25, 10:28 AM MST	Winter Storm Warning	UNR	14 hr
Mar 1, 9:23 PM MST	Winter Storm Watch	UNR	16 hr
Mar 2, 2:50 AM MST	Winter Weather Advisory	UNR	36 hr
Mar 2, 1:29 PM MST	Winter Storm Warning	UNR	21 hr
Mar 3, 2:22 PM MST	Wind Chill Advisory	UNR	18 hr
Mar 16, 2:33 AM MDT	Wind Advisory	UNR	12 hr
Mar 27, 2:19 PM MDT	High Wind Watch	UNR	13 hr
Mar 28, 2:57 AM MDT	High Wind Warning	UNR	30 hr
Mar 31, 2:21 PM MDT	Wind Advisory	UNR	29 hr
Apr 14, 9:52 AM MDT	Wind Advisory	UNR	18 hr
Apr 19, 3:20 AM MDT	Wind Advisory	UNR	16 hr
Apr 23, 4:15 PM MDT	Special Weather Statement	UNR	45 min
Apr 23, 6:08 PM MDT	Special Weather Statement	UNR	52 min
Apr 23, 6:22 PM MDT	Severe Thunderstorm Warning	UNR	53 min
May 6, 5:17 PM MDT	Areal Flood Advisory	UNR	3 hr
May 7, 2:45 PM MDT	Winter Storm Watch	UNR	37 hr
May 8, 1:55 PM MDT	Winter Storm Warning	UNR	52 hr
May 9, 2:41 PM MDT	Blizzard Warning	UNR	24 hr
May 15, 4:46 PM MDT	Mesoscale Discussion	SPC	59 min
May 15, 8:25 PM MDT	Areal Flood Advisory	UNR	8 hr
May 16, 3:14 PM MDT	River Flood Warning	UNR	29 hr
May 17, 11:34 AM MDT	Wind Advisory	UNR	10 hr
May 18, 2:51 AM MDT	Frost Advisory	UNR	28 hr
May 20, 2:32 PM MDT	Frost Advisory	UNR	16 hr
May 23, 3:05 PM MDT	Flood Watch	UNR	43 hr
May 24, 8:50 AM MDT	Areal Flood Warning	UNR	36 hr
May 24, 10:41 AM MDT	Areal Flood Warning	UNR	36 hr
May 24, 11:55 AM MDT	Areal Flood Warning	UNR	36 hr
May 25, 10:09 PM MDT	Areal Flood Warning	UNR	36 hr
May 25, 11:28 PM MDT	Areal Flood Warning	UNR	24 hr
May 27, 1:24 PM MDT	Areal Flood Warning	UNR	10 days
May 27, 1:49 PM MDT	Special Weather Statement	UNR	41 min
Jun 1, 7:28 PM MDT	Severe Thunderstorm Warning	UNR	62 min
Jun 1, 7:47 PM MDT	Severe Thunderstorm Warning	UNR	58 min
Jun 1, 8:11 PM MDT	Flash Flood Warning	UNR	3 hr
Jun 1, 8:41 PM MDT	Severe Thunderstorm Warning	UNR	64 min
Jun 1, 9:19 PM MDT	Flash Flood Warning	UNR	12 hr
Jun 1, 9:36 PM MDT	Severe Thunderstorm Warning	UNR	37 min
Jun 2, 9:03 AM MDT	Areal Flood Warning	UNR	48 hr
Jun 2, 2:44 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 2, 4:17 PM MDT	Severe Thunderstorm Warning	UNR	28 min
Jun 2, 4:41 PM MDT	Severe Thunderstorm Warning	UNR	24 min
Jun 2, 5:17 PM MDT	Special Weather Statement	UNR	43 min
Jun 2, 5:27 PM MDT	Mesoscale Discussion	SPC	2 hr
Jun 2, 5:45 PM MDT	Special Weather Statement	UNR	30 min
Jun 2, 5:56 PM MDT	Special Weather Statement	UNR	34 min
Jun 2, 8:01 PM MDT	Mesoscale Discussion	SPC	89 min
Jun 2, 8:55 PM MDT	Severe Thunderstorm Warning	UNR	35 min
Jun 2, 9:47 PM MDT	Special Weather Statement	UNR	43 min
Jun 2, 10:12 PM MDT	Severe Thunderstorm Warning	UNR	46 min
Jun 4, 1:29 AM MDT	Mesoscale Discussion	SPC	91 min
Jun 4, 1:54 AM MDT	Severe Thunderstorm Warning	UNR	66 min
Jun 5, 9:26 AM MDT	Flash Flood Watch	UNR	18 hr
Jun 6, 12:31 PM MDT	Flash Flood Warning	UNR	3 hr
Jun 6, 1:26 PM MDT	Areal Flood Warning	UNR	3 days
Jun 6, 1:31 PM MDT	Areal Flood Warning	UNR	7 days
Jun 6, 2:09 PM MDT	Severe Thunderstorm Warning	UNR	51 min
Jun 9, 3:56 PM MDT	Severe Thunderstorm Warning	UNR	64 min
Jun 9, 4:49 PM MDT	Flash Flood Warning	UNR	6 hr
Jun 10, 3:52 AM MDT	Flash Flood Watch	UNR	38 hr
Jun 13, 11:49 PM MDT	Mesoscale Discussion	SPC	2 hr
Jun 14, 3:44 AM MDT	Severe Thunderstorm Warning	UNR	61 min
Jun 14, 4:01 AM MDT	Mesoscale Discussion	SPC	2 hr
Jun 14, 4:31 AM MDT	Severe Thunderstorm Warning	UNR	59 min
Jun 15, 10:32 AM MDT	Flood Watch	UNR	24 hr
Jun 16, 1:12 PM MDT	Mesoscale Discussion	SPC	2 hr
Jun 16, 2:02 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 16, 4:53 PM MDT	Mesoscale Discussion	SPC	97 min
Jun 16, 6:21 PM MDT	Severe Thunderstorm Warning	UNR	39 min
Jun 17, 2:32 PM MDT	Mesoscale Discussion	SPC	118 min
Jun 17, 5:15 PM MDT	Special Weather Statement	UNR	30 min
Jun 17, 5:31 PM MDT	Severe Thunderstorm Warning	UNR	59 min
Jun 17, 5:39 PM MDT	Severe Thunderstorm Watch	SPC	9 hr
Jun 17, 6:18 PM MDT	Severe Thunderstorm Warning	UNR	42 min
Jun 17, 6:44 PM MDT	Mesoscale Discussion	SPC	61 min
Jun 17, 6:58 PM MDT	Severe Thunderstorm Warning	UNR	24 min
Jun 17, 9:41 PM MDT	Severe Thunderstorm Warning	UNR	64 min
Jun 17, 10:23 PM MDT	Severe Thunderstorm Warning	UNR	52 min
Jun 17, 10:37 PM MDT	Mesoscale Discussion	SPC	53 min
Jun 17, 10:44 PM MDT	Severe Thunderstorm Warning	UNR	61 min
Jun 17, 10:48 PM MDT	Areal Flood Advisory	UNR	3 hr
Jun 18, 6:26 AM MDT	Areal Flood Warning	UNR	9 hr
Jun 19, 2:51 PM MDT	Tornado Watch	SPC	7 hr
Jun 19, 6:38 PM MDT	Mesoscale Discussion	SPC	67 min
Jun 19, 8:49 PM MDT	Severe Thunderstorm Warning	UNR	56 min
Jun 19, 9:26 PM MDT	Tornado Warning Tornado observedConsiderable damage threat	UNR	49 min
Jun 19, 9:31 PM MDT	Severe Thunderstorm Warning	UNR	59 min
Jun 19, 9:41 PM MDT	Severe Thunderstorm Warning	UNR	64 min
Jun 19, 9:57 PM MDT	Severe Thunderstorm Watch PDS	SPC	5 hr
Jun 19, 10:07 PM MDT	Severe Thunderstorm Warning	UNR	53 min
Jun 19, 10:46 PM MDT	Severe Thunderstorm Warning	UNR	59 min
Jun 19, 11:04 PM MDT	Severe Thunderstorm Warning	UNR	41 min
Jun 19, 11:31 PM MDT	Severe Thunderstorm Warning	UNR	46 min
Jun 20, 2:50 PM MDT	Mesoscale Discussion	SPC	115 min
Jun 20, 5:44 PM MDT	Severe Thunderstorm Warning	UNR	61 min
Jun 20, 5:45 PM MDT	Severe Thunderstorm Warning	UNR	60 min
Jun 20, 6:08 PM MDT	Severe Thunderstorm Warning	UNR	26 min
Jun 20, 11:00 PM MDT	Severe Thunderstorm Warning	UNR	60 min
Jun 20, 11:49 PM MDT	Severe Thunderstorm Warning	UNR	56 min
Jun 21, 12:05 AM MDT	Mesoscale Discussion	SPC	85 min
Jun 21, 11:56 PM MDT	Severe Thunderstorm Warning	UNR	64 min
Jun 22, 12:08 AM MDT	Severe Thunderstorm Warning	UNR	22 min
Jun 22, 12:30 AM MDT	Severe Thunderstorm Warning	UNR	60 min
Jun 23, 11:50 PM MDT	Severe Thunderstorm Watch	SPC	5 hr
Jun 23, 11:55 PM MDT	Mesoscale Discussion	SPC	35 min
Jun 24, 12:26 AM MDT	Severe Thunderstorm Warning	UNR	49 min
Jun 24, 12:37 AM MDT	Severe Thunderstorm Warning	UNR	53 min
Jun 24, 1:23 AM MDT	Special Weather Statement	UNR	52 min
Jun 24, 1:28 AM MDT	Severe Thunderstorm Warning	UNR	43 min
Jun 24, 1:53 AM MDT	Severe Thunderstorm Warning	UNR	52 min
Jun 24, 2:01 AM MDT	Severe Thunderstorm Warning	UNR	59 min
Jun 24, 2:23 AM MDT	Mesoscale Discussion	SPC	97 min
Jun 24, 2:32 AM MDT	Severe Thunderstorm Warning	UNR	43 min
Jun 24, 2:33 AM MDT	Areal Flood Warning	UNR	18 hr
Jun 24, 3:28 AM MDT	Areal Flood Warning	UNR	18 hr
Jun 24, 4:16 AM MDT	Areal Flood Warning	UNR	18 hr
Jun 24, 4:19 AM MDT	Mesoscale Discussion	SPC	56 min
Jun 24, 12:27 PM MDT	Mesoscale Discussion	SPC	2 hr
Jun 24, 2:51 PM MDT	Flood Watch	UNR	30 hr
Jun 24, 6:13 PM MDT	Mesoscale Discussion	SPC	2 hr
Jun 25, 12:59 AM MDT	Areal Flood Warning	UNR	15 hr
Jun 25, 6:46 AM MDT	Mesoscale Discussion	SPC	89 min
Jun 25, 1:18 PM MDT	Severe Thunderstorm Warning	UNR	57 min
Jun 28, 3:54 PM MDT	Severe Thunderstorm Warning	UNR	66 min
Jun 30, 2:49 PM MDT	Mesoscale Discussion	SPC	86 min
Jun 30, 6:55 PM MDT	Mesoscale Discussion	SPC	95 min
Jun 30, 9:35 PM MDT	Severe Thunderstorm Warning	UNR	85 min
Jul 1, 6:48 PM MDT	Mesoscale Discussion	SPC	117 min
Jul 1, 10:06 PM MDT	Severe Thunderstorm Warning	UNR	54 min
Jul 4, 4:18 PM MDT	Mesoscale Discussion	SPC	117 min
Jul 5, 2:46 PM MDT	Mesoscale Discussion	SPC	119 min
Jul 12, 7:06 PM MDT	Special Weather Statement	UNR	54 min
Jul 12, 7:17 PM MDT	Severe Thunderstorm Warning	UNR	26 min
Jul 12, 7:23 PM MDT	Severe Thunderstorm Warning	UNR	52 min
Jul 12, 8:05 PM MDT	Severe Thunderstorm Warning	UNR	55 min
Jul 14, 4:43 PM MDT	Severe Thunderstorm Warning	UNR	50 min
Jul 14, 6:18 PM MDT	Special Weather Statement	UNR	57 min
Jul 14, 7:21 PM MDT	Severe Thunderstorm Warning	UNR	54 min
Jul 14, 8:09 PM MDT	Severe Thunderstorm Warning	UNR	66 min
Jul 15, 1:43 AM MDT	Areal Flood Warning	UNR	18 hr
Jul 15, 1:51 AM MDT	Special Weather Statement	UNR	39 min
Jul 15, 1:58 AM MDT	Areal Flood Warning	UNR	18 hr
Jul 15, 2:21 PM MDT	Areal Flood Advisory	UNR	6 hr
Jul 15, 3:13 PM MDT	Special Weather Statement	UNR	47 min
Jul 15, 4:05 PM MDT	Special Weather Statement	UNR	25 min
Jul 15, 7:05 PM MDT	Areal Flood Warning	UNR	24 hr
Jul 17, 2:36 PM MDT	Mesoscale Discussion	SPC	54 min
Jul 17, 3:03 PM MDT	Severe Thunderstorm Watch	SPC	8 hr
Jul 17, 5:02 PM MDT	Mesoscale Discussion	SPC	118 min
Jul 24, 7:10 PM MDT	Severe Thunderstorm Warning	UNR	65 min
Jul 24, 7:39 PM MDT	Severe Thunderstorm Warning	UNR	36 min
Jul 24, 7:56 PM MDT	Severe Thunderstorm Warning	UNR	64 min
Jul 24, 8:08 PM MDT	Special Weather Statement	UNR	37 min
Jul 24, 8:53 PM MDT	Severe Thunderstorm Warning	UNR	67 min
Jul 25, 4:42 AM MDT	Severe Thunderstorm Warning	UNR	44 min
Jul 25, 3:27 PM MDT	Special Weather Statement	UNR	48 min
Jul 25, 3:36 PM MDT	Severe Thunderstorm Warning	UNR	54 min
Jul 25, 4:19 PM MDT	Severe Thunderstorm Warning	UNR	71 min
Jul 26, 1:07 PM MDT	Mesoscale Discussion	SPC	83 min
Jul 27, 2:50 PM MDT	Mesoscale Discussion	SPC	85 min
Jul 27, 2:58 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 27, 3:33 PM MDT	Severe Thunderstorm Warning	UNR	57 min
Jul 27, 4:25 PM MDT	Severe Thunderstorm Warning	UNR	65 min
Jul 27, 5:25 PM MDT	Severe Thunderstorm Warning	UNR	80 min
Jul 27, 5:32 PM MDT	Mesoscale Discussion	SPC	118 min
Jul 27, 5:55 PM MDT	Severe Thunderstorm Warning	UNR	65 min
Jul 27, 5:57 PM MDT	Severe Thunderstorm Warning	UNR	63 min
Jul 27, 5:59 PM MDT	Areal Flood Warning	UNR	3 hr
Jul 27, 6:50 PM MDT	Severe Thunderstorm Warning	UNR	85 min
Jul 27, 7:01 PM MDT	Severe Thunderstorm Warning	UNR	59 min
Jul 27, 8:14 PM MDT	Severe Thunderstorm Warning	UNR	76 min
Jul 27, 8:19 PM MDT	Mesoscale Discussion	SPC	116 min
Aug 1, 3:27 AM MDT	Mesoscale Discussion	SPC	3 hr
Aug 3, 1:50 PM MDT	Flash Flood Watch	UNR	31 hr
Aug 5, 6:21 PM MDT	Severe Thunderstorm Warning	UNR	54 min
Aug 5, 7:00 PM MDT	Severe Thunderstorm Warning	UNR	60 min
Aug 5, 9:11 PM MDT	Special Weather Statement	UNR	64 min
Aug 6, 12:47 AM MDT	Special Weather Statement	UNR	28 min
Aug 8, 2:18 PM MDT	Mesoscale Discussion	SPC	87 min
Aug 8, 3:05 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Aug 8, 4:38 PM MDT	Special Weather Statement	UNR	52 min
Aug 8, 5:22 PM MDT	Special Weather Statement	UNR	38 min
Aug 8, 5:26 PM MDT	Severe Thunderstorm Warning	UNR	64 min
Aug 8, 5:30 PM MDT	Severe Thunderstorm Warning	UNR	60 min
Aug 8, 6:16 PM MDT	Severe Thunderstorm Warning	UNR	59 min
Aug 8, 6:24 PM MDT	Severe Thunderstorm Warning	UNR	66 min
Aug 8, 7:07 PM MDT	Mesoscale Discussion	SPC	53 min
Aug 8, 7:13 PM MDT	Severe Thunderstorm Warning	UNR	62 min
Aug 8, 9:55 PM MDT	Severe Thunderstorm Warning	UNR	65 min
Aug 11, 5:40 PM MDT	Severe Thunderstorm Warning	UNR	50 min
Aug 17, 6:16 PM MDT	Mesoscale Discussion	SPC	89 min
Aug 21, 3:02 AM MDT	High Wind Watch	UNR	12 hr
Aug 21, 2:33 PM MDT	High Wind Warning	UNR	30 hr
Aug 26, 8:48 PM MDT	Severe Thunderstorm Warning	UNR	34 min
Aug 26, 9:40 PM MDT	Special Weather Statement	UNR	65 min
Aug 30, 7:15 PM MDT	Special Weather Statement	UNR	60 min
Aug 30, 7:22 PM MDT	Special Weather Statement	UNR	53 min
Oct 10, 2:32 PM MDT	Wind Advisory	UNR	45 hr
Oct 11, 3:39 AM MDT	High Wind Warning	UNR	26 hr
Oct 15, 3:47 AM MDT	Freeze Warning	UNR	29 hr
Oct 23, 3:17 AM MDT	Wind Advisory	UNR	15 hr
Oct 27, 2:50 PM MDT	Wind Advisory	UNR	27 hr
Nov 10, 2:20 PM MST	Wind Advisory	UNR	48 hr
Nov 15, 2:31 PM MST	High Wind Watch	UNR	13 hr
Nov 16, 3:03 AM MST	High Wind Warning	UNR	24 hr
Nov 16, 2:54 PM MST	High Wind Watch	UNR	24 hr
Nov 17, 2:57 AM MST	High Wind Warning	UNR	40 hr
Nov 18, 6:31 PM MST	Wind Advisory	UNR	11 hr
Nov 24, 2:57 PM MST	Winter Weather Advisory	UNR	42 hr
Nov 29, 1:58 PM MST	Winter Weather Advisory	UNR	51 hr
Dec 13, 3:12 AM MST	Winter Storm Watch	UNR	35 hr
Dec 13, 5:17 PM MST	Dense Fog Advisory	UNR	16 hr
Dec 14, 3:13 AM MST	Winter Storm Warning	UNR	55 hr
Dec 14, 2:20 PM MST	Winter Weather Advisory	UNR	53 hr
Dec 14, 6:28 PM MST	Freezing Fog Advisory	UNR	11 hr
Dec 24, 2:22 PM MST	Winter Storm Warning	UNR	50 hr
Dec 24, 2:22 PM MST	Winter Weather Advisory	UNR	44 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	77
Tornado Warning	1
Severe Thunderstorm Watch	8
Tornado Watch	1
Mesoscale Discussion	35
Special Weather Statement	23
Flooding
Areal Flood Warning	18
Flash Flood Warning	4
River Flood Warning	1
Flash Flood Watch	3
Flood Watch	3
Areal Flood Advisory	4
Winter
Blizzard Warning	1
Winter Storm Warning	5
Winter Storm Watch	3
Freezing Rain Advisory	1
Winter Weather Advisory	9
Cold
Freeze Warning	1
Frost Advisory	2
Wind Chill Advisory	3
Wind and dust
High Wind Warning	7
High Wind Watch	4
Wind Advisory	17
Fog and smoke
Dense Fog Advisory	3
Freezing 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 2014 2016

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.