Alert archive / South Dakota / Perkins County

Weather alerts in Perkins County, South Dakota, 2011

198 weather alerts in 2011, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Perkins County and its neighbors

Each county as a circle sized by its count in 2011. Tap one for its archive.

Alerts: 198
Warnings: 84
Watches: 36
Advisories: 45
Busiest month: July56 alerts
Busiest day: August 1, 201113 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 2 tornado warnings covering Perkins County in 2011 had a tornado report inside them.

Perkins County, 2011

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	2	0	100%	0
Severe thunderstorm warnings	59	46	22%	48	90%	30 min
Flash flood warnings	6	3	50%	1	100%	113 min

Each office's whole area, 2011

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Rapid City, SD: tornado warnings	23	2	91%	5	40%	55 min
NWS Rapid City, SD: severe thunderstorm warnings	426	315	26%	626	88%	25 min
NWS Rapid City, SD: flash flood warnings	30	10	67%	16	94%	70 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
Dec 31, 10:00 PM MST	Wind Chill Advisory	UNR	12 hr
Jan 7, 2:38 AM MST	Winter Storm Watch	UNR	11 hr
Jan 7, 1:26 PM MST	Winter Weather Advisory	UNR	58 hr
Jan 10, 2:43 PM MST	Wind Chill Advisory	UNR	21 hr
Jan 16, 2:44 PM MST	Winter Weather Advisory	UNR	20 hr
Jan 21, 2:23 PM MST	Winter Weather Advisory	UNR	28 hr
Jan 29, 2:03 PM MST	Winter Weather Advisory	UNR	48 hr
Jan 31, 2:44 AM MST	Wind Chill Warning	UNR	33 hr
Feb 1, 4:09 AM MST	Wind Chill Advisory	UNR	16 hr
Feb 1, 2:54 PM MST	Wind Chill Warning	UNR	19 hr
Feb 4, 2:12 PM MST	Winter Weather Advisory	UNR	48 hr
Feb 7, 2:39 PM MST	Wind Chill Advisory	UNR	19 hr
Feb 8, 2:41 PM MST	Wind Chill Advisory	UNR	19 hr
Feb 12, 11:10 AM MST	High Wind Watch	UNR	15 hr
Feb 13, 2:16 AM MST	High Wind Warning	UNR	17 hr
Feb 16, 2:39 PM MST	Wind Advisory	UNR	26 hr
Feb 18, 1:56 PM MST	Winter Storm Watch	UNR	13 hr
Feb 19, 2:35 AM MST	Winter Storm Warning	UNR	44 hr
Feb 20, 8:17 AM MST	Mesoscale Discussion	SPC	4 hr
Feb 24, 2:48 PM MST	Wind Chill Advisory	UNR	13 hr
Mar 3, 10:24 PM MST	Severe Thunderstorm Watch	SPC	157 days
Mar 10, 2:57 PM MST	Wind Advisory	UNR	27 hr
Mar 11, 8:24 AM MST	High Wind Warning	UNR	10 hr
Mar 16, 9:03 AM MDT	Areal Flood Warning	UNR	6 days
Mar 16, 2:57 PM MDT	River Flood Warning	UNR	60 hr
Mar 21, 3:24 AM MDT	Wind Advisory	UNR	12 hr
Mar 25, 3:18 AM MDT	Winter Weather Advisory	UNR	39 hr
Apr 2, 2:52 PM MDT	Wind Advisory	UNR	33 hr
Apr 10, 3:50 AM MDT	Wind Advisory	UNR	14 hr
Apr 13, 4:32 AM MDT	Winter Storm Watch	UNR	24 hr
Apr 14, 4:07 AM MDT	Winter Weather Advisory	UNR	24 hr
Apr 18, 2:42 PM MDT	Winter Weather Advisory	UNR	24 hr
Apr 21, 4:03 AM MDT	Wind Advisory	UNR	10 hr
Apr 21, 2:48 PM MDT	Wind Advisory	UNR	33 hr
Apr 22, 3:51 AM MDT	Winter Weather Advisory	UNR	24 hr
Apr 29, 3:22 PM MDT	High Wind Watch	UNR	11 hr
Apr 30, 2:44 AM MDT	High Wind Warning	UNR	16 hr
Apr 30, 6:55 PM MDT	High Wind Warning	UNR	2 hr
May 7, 9:13 PM MDT	Flood Watch	UNR	63 hr
May 9, 7:34 PM MDT	Severe Thunderstorm Warning	UNR	56 min
May 9, 8:19 PM MDT	Flash Flood Warning	UNR	6 hr
May 9, 8:24 PM MDT	Severe Thunderstorm Warning	UNR	66 min
May 9, 9:44 PM MDT	Severe Thunderstorm Warning	UNR	61 min
May 9, 10:17 PM MDT	Mesoscale Discussion	SPC	58 min
May 9, 11:45 PM MDT	Severe Thunderstorm Warning	UNR	60 min
May 9, 11:48 PM MDT	Flash Flood Warning	UNR	3 hr
May 10, 12:56 AM MDT	Mesoscale Discussion	SPC	94 min
May 10, 2:22 AM MDT	Areal Flood Warning	UNR	12 hr
May 15, 2:17 PM MDT	Wind Advisory	UNR	31 hr
May 16, 2:59 PM MDT	Flash Flood Watch	UNR	4 days
May 20, 9:33 AM MDT	Areal Flood Advisory	UNR	12 hr
May 26, 3:03 AM MDT	Wind Advisory	UNR	17 hr
May 27, 2:49 PM MDT	Flood Watch	UNR	61 hr
May 30, 3:56 AM MDT	High Wind Watch	UNR	11 hr
May 30, 2:39 PM MDT	High Wind Warning	UNR	27 hr
Jun 2, 6:22 PM MDT	Severe Thunderstorm Watch	SPC	8 hr
Jun 2, 8:46 PM MDT	Severe Thunderstorm Warning	UNR	39 min
Jun 11, 3:59 PM MDT	Tornado Watch	SPC	7 hr
Jun 11, 7:11 PM MDT	Mesoscale Discussion	SPC	64 min
Jun 12, 10:02 AM MDT	Flash Flood Watch	UNR	10 hr
Jun 12, 12:52 PM MDT	Mesoscale Discussion	SPC	53 min
Jun 12, 1:49 PM MDT	Tornado Watch	SPC	6 hr
Jun 12, 5:53 PM MDT	Severe Thunderstorm Warning	UNR	67 min
Jun 12, 6:33 PM MDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 12, 6:44 PM MDT	Severe Thunderstorm Warning	UNR	61 min
Jun 12, 7:19 PM MDT	Severe Thunderstorm Warning	UNR	43 min
Jun 16, 10:43 AM MDT	Flash Flood Watch	UNR	17 hr
Jun 24, 1:52 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 24, 4:57 PM MDT	Mesoscale Discussion	SPC	2 hr
Jun 24, 6:54 PM MDT	Severe Thunderstorm Warning	UNR	96 min
Jun 25, 5:21 PM MDT	Mesoscale Discussion	SPC	84 min
Jun 26, 3:58 AM MDT	Severe Thunderstorm Warning	UNR	62 min
Jun 26, 4:37 AM MDT	Severe Thunderstorm Warning	UNR	24 min
Jun 26, 5:08 AM MDT	Mesoscale Discussion	SPC	97 min
Jun 26, 10:24 AM MDT	Severe Thunderstorm Warning	UNR	66 min
Jul 2, 2:13 PM MDT	Tornado Watch	SPC	8 hr
Jul 6, 8:37 AM MDT	Flash Flood Warning	UNR	6 hr
Jul 6, 12:25 PM MDT	Mesoscale Discussion	SPC	3 hr
Jul 6, 5:20 PM MDT	Severe Thunderstorm Warning	UNR	55 min
Jul 6, 6:09 PM MDT	Flash Flood Warning	UNR	4 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 14, 2:55 PM MDT	Mesoscale Discussion	SPC	2 hr
Jul 14, 4:33 PM MDT	Tornado Watch	SPC	7 hr
Jul 14, 5:08 PM MDT	Severe Thunderstorm Warning	UNR	50 min
Jul 14, 5:51 PM MDT	Severe Thunderstorm Warning	UNR	54 min
Jul 14, 6:46 PM MDT	Severe Thunderstorm Warning	UNR	22 min
Jul 14, 7:12 PM MDT	Severe Thunderstorm Warning	UNR	63 min
Jul 14, 7:54 PM MDT	Severe Thunderstorm Warning	UNR	81 min
Jul 14, 8:23 PM MDT	Flash Flood Warning	UNR	4 hr
Jul 14, 8:42 PM MDT	Areal Flood Advisory	UNR	4 hr
Jul 14, 8:46 PM MDT	Mesoscale Discussion	SPC	59 min
Jul 15, 3:20 AM MDT	Excessive Heat Warning	UNR	5 days
Jul 18, 2:11 PM MDT	Mesoscale Discussion	SPC	94 min
Jul 18, 2:28 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 18, 3:54 PM MDT	Tornado Warning	UNR	51 min
Jul 18, 4:27 PM MDT	Tornado Warning	UNR	48 min
Jul 19, 2:36 PM MDT	Wind Advisory	UNR	24 hr
Jul 22, 10:05 AM MDT	Mesoscale Discussion	SPC	55 min
Jul 22, 4:17 PM MDT	Mesoscale Discussion	SPC	88 min
Jul 22, 4:35 PM MDT	Tornado Watch	SPC	8 hr
Jul 22, 7:56 PM MDT	Mesoscale Discussion	SPC	94 min
Jul 22, 8:33 PM MDT	Severe Thunderstorm Warning	UNR	57 min
Jul 22, 9:21 PM MDT	Severe Thunderstorm Warning	UNR	54 min
Jul 22, 9:45 PM MDT	Severe Thunderstorm Warning	UNR	32 min
Jul 22, 10:08 PM MDT	Severe Thunderstorm Warning	UNR	67 min
Jul 22, 11:10 PM MDT	Severe Thunderstorm Warning	UNR	65 min
Jul 23, 12:11 AM MDT	Severe Thunderstorm Warning	UNR	64 min
Jul 25, 11:23 AM MDT	Mesoscale Discussion	SPC	97 min
Jul 25, 1:30 PM MDT	Severe Thunderstorm Watch	SPC	8 hr
Jul 25, 4:39 PM MDT	Mesoscale Discussion	SPC	96 min
Jul 25, 5:16 PM MDT	Severe Thunderstorm Warning	UNR	29 min
Jul 25, 5:38 PM MDT	Severe Thunderstorm Warning	UNR	67 min
Jul 25, 6:39 PM MDT	Severe Thunderstorm Warning	UNR	66 min
Jul 25, 6:44 PM MDT	Flash Flood Warning	UNR	3 hr
Jul 28, 1:05 PM MDT	Mesoscale Discussion	SPC	115 min
Jul 28, 2:24 PM MDT	Severe Thunderstorm Warning	UNR	66 min
Jul 28, 2:31 PM MDT	Severe Thunderstorm Watch	SPC	5 hr
Jul 28, 3:05 PM MDT	Severe Thunderstorm Warning	UNR	55 min
Jul 28, 3:45 PM MDT	Severe Thunderstorm Warning	UNR	60 min
Jul 28, 3:58 PM MDT	Severe Thunderstorm Warning	UNR	62 min
Jul 28, 4:58 PM MDT	Severe Thunderstorm Warning	UNR	62 min
Jul 29, 12:59 PM MDT	Mesoscale Discussion	SPC	91 min
Jul 29, 1:54 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 29, 4:46 PM MDT	Mesoscale Discussion	SPC	59 min
Jul 29, 6:11 PM MDT	Severe Thunderstorm Warning	UNR	64 min
Jul 29, 6:18 PM MDT	Severe Thunderstorm Warning	UNR	57 min
Jul 29, 7:35 PM MDT	Severe Thunderstorm Warning	UNR	55 min
Jul 29, 8:06 PM MDT	Mesoscale Discussion	SPC	54 min
Jul 31, 4:44 PM MDT	Tornado Watch	SPC	7 hr
Jul 31, 5:47 PM MDT	Severe Thunderstorm Warning	UNR	27 min
Jul 31, 6:23 PM MDT	Severe Thunderstorm Warning	UNR	67 min
Jul 31, 6:30 PM MDT	Severe Thunderstorm Warning	UNR	60 min
Jul 31, 6:52 PM MDT	Severe Thunderstorm Warning	UNR	53 min
Jul 31, 7:41 PM MDT	Severe Thunderstorm Warning	UNR	34 min
Jul 31, 9:42 PM MDT	Severe Thunderstorm Warning	UNR	51 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, 1:21 PM MDT	Severe Thunderstorm Warning	UNR	20 min
Aug 1, 2:28 PM MDT	Severe Thunderstorm Warning	UNR	62 min
Aug 1, 3:21 PM MDT	Severe Thunderstorm Warning	UNR	54 min
Aug 1, 4:02 PM MDT	Severe Thunderstorm Warning	UNR	73 min
Aug 1, 4:57 PM MDT	Mesoscale Discussion	SPC	2 hr
Aug 1, 5:10 PM MDT	Mesoscale Discussion	SPC	2 hr
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, 4:48 PM MDT	Severe Thunderstorm Warning	UNR	72 min
Aug 7, 5:29 PM MDT	Severe Thunderstorm Warning	UNR	61 min
Aug 7, 5:35 PM MDT	Mesoscale Discussion	SPC	115 min
Aug 7, 5:58 PM MDT	Severe Thunderstorm Warning	UNR	62 min
Aug 7, 6:26 PM MDT	Severe Thunderstorm Warning	UNR	28 min
Aug 7, 6:50 PM MDT	Severe Thunderstorm Warning	UNR	55 min
Aug 7, 7:29 PM MDT	Severe Thunderstorm Warning	UNR	61 min
Aug 11, 12:49 PM MDT	Mesoscale Discussion	SPC	86 min
Aug 11, 6:16 PM MDT	Severe Thunderstorm Watch	SPC	4 hr
Aug 11, 8:55 PM MDT	Mesoscale Discussion	SPC	65 min
Aug 11, 8:56 PM MDT	Severe Thunderstorm Warning	UNR	64 min
Aug 15, 2:47 PM MDT	Mesoscale Discussion	SPC	58 min
Aug 15, 4:23 PM MDT	Severe Thunderstorm Watch	SPC	9 hr
Aug 15, 8:37 PM MDT	Mesoscale Discussion	SPC	83 min
Aug 15, 9:59 PM MDT	Severe Thunderstorm Warning	UNR	61 min
Aug 15, 10:53 PM MDT	Severe Thunderstorm Warning	UNR	37 min
Aug 18, 3:34 PM MDT	Severe Thunderstorm Warning	UNR	56 min
Aug 18, 3:45 PM MDT	Severe Thunderstorm Watch	SPC	4 hr
Aug 18, 4:06 PM MDT	Severe Thunderstorm Warning	UNR	54 min
Sep 2, 1:56 PM MDT	Mesoscale Discussion	SPC	94 min
Sep 2, 6:09 PM MDT	Wind Advisory	UNR	11 hr
Sep 19, 3:30 AM MDT	High Wind Watch	UNR	11 hr
Sep 19, 2:15 PM MDT	High Wind Warning	UNR	24 hr
Sep 29, 11:03 AM MDT	Frost Advisory	UNR	21 hr
Oct 5, 4:06 AM MDT	Wind Advisory	UNR	14 hr
Oct 5, 3:09 PM MDT	Wind Advisory	UNR	27 hr
Oct 6, 2:18 PM MDT	Wind Advisory	UNR	29 hr
Oct 6, 2:32 PM MDT	Severe Thunderstorm Watch	SPC	9 hr
Oct 6, 5:54 PM MDT	Severe Thunderstorm Warning	UNR	51 min
Oct 6, 6:38 PM MDT	Severe Thunderstorm Warning	UNR	45 min
Oct 7, 3:50 AM MDT	High Wind Warning	UNR	15 hr
Oct 12, 3:34 AM MDT	Wind Advisory	UNR	14 hr
Oct 13, 3:29 AM MDT	Wind Advisory	UNR	15 hr
Oct 17, 2:52 PM MDT	Freeze Warning	UNR	18 hr
Oct 23, 5:48 AM MDT	Wind Advisory	UNR	9 hr
Oct 29, 3:36 AM MDT	Wind Advisory	UNR	15 hr
Nov 4, 2:50 AM MDT	Wind Advisory	UNR	44 hr
Nov 6, 2:12 AM MST	Wind Advisory	UNR	15 hr
Nov 15, 10:12 AM MST	Wind Advisory	UNR	5 hr
Nov 17, 2:15 PM MST	Winter Storm Watch	UNR	22 hr
Nov 18, 12:19 PM MST	Winter Storm Warning	UNR	26 hr
Nov 18, 12:19 PM MST	Winter Weather Advisory	UNR	26 hr
Nov 24, 2:18 PM MST	High Wind Watch	UNR	25 hr
Nov 25, 2:28 AM MST	Wind Advisory	UNR	37 hr
Nov 25, 3:02 PM MST	High Wind Warning	UNR	24 hr
Dec 3, 3:22 PM MST	Wind Advisory	UNR	29 hr
Dec 25, 2:49 PM MST	Wind Advisory	UNR	26 hr
Dec 29, 3:17 AM MST	Wind Advisory	UNR	24 hr
Dec 30, 3:39 AM MST	High Wind Watch	UNR	11 hr
Dec 30, 2:36 PM MST	High Wind Warning	UNR	26 hr
Dec 30, 2:36 PM MST	Wind Advisory	UNR	45 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
Tornado Warning	2
Severe Thunderstorm Watch	15
Tornado Watch	6
Mesoscale Discussion	33
Flooding
Areal Flood Warning	2
Flash Flood Warning	6
River Flood Warning	1
Flash Flood Watch	3
Flood Watch	2
Areal Flood Advisory	2
Winter
Winter Storm Warning	2
Winter Storm Watch	4
Winter Weather Advisory	10
Heat
Excessive Heat Warning	1
Cold
Freeze Warning	1
Wind Chill Warning	2
Frost Advisory	1
Wind Chill Advisory	6
Wind and dust
High Wind Warning	9
High Wind Watch	6
Wind Advisory	26

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.