Alert archive / South Dakota / Custer County

Weather alerts in Custer County, South Dakota, 2009

161 weather alerts in 2009, 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 2009. Tap one for its archive.

Alerts: 161
Warnings: 52
Watches: 36
Advisories: 43
Busiest month: June33 alerts
Busiest day: June 14, 20099 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 Custer County in 2009 had a tornado report inside them.

Custer County, 2009

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	1	0	100%	0
Severe thunderstorm warnings	35	24	31%	16	94%	13 min
Flash flood warnings	2	0	100%	0

Each office's whole area, 2009

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Rapid City, SD: tornado warnings	27	6	78%	10	90%	19 min
NWS Rapid City, SD: severe thunderstorm warnings	262	172	34%	345	79%	27 min
NWS Rapid City, SD: flash flood warnings	10	4	60%	4	75%	59 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 6, 9:45 AM MST	Winter Weather Advisory	UNR	35 hr
Jan 8, 2:25 PM MST	Wind Advisory	UNR	26 hr
Jan 10, 2:51 PM MST	High Wind Watch	UNR	14 hr
Jan 11, 4:23 AM MST	High Wind Warning	UNR	32 hr
Jan 13, 1:10 PM MST	Wind Advisory	UNR	14 hr
Jan 13, 2:46 PM MST	Winter Weather Advisory	UNR	24 hr
Jan 16, 3:14 AM MST	Wind Advisory	UNR	35 hr
Jan 18, 3:34 AM MST	Wind Advisory	UNR	13 hr
Jan 19, 3:35 AM MST	Wind Advisory	UNR	11 hr
Jan 22, 6:27 PM MST	Wind Advisory	UNR	8 hr
Jan 24, 10:28 AM MST	Winter Weather Advisory	UNR	53 hr
Jan 27, 1:39 PM MST	Wind Advisory	UNR	28 hr
Jan 27, 4:08 PM MST	Winter Weather Advisory	UNR	25 hr
Jan 29, 7:56 AM MST	Winter Weather Advisory	UNR	19 hr
Jan 30, 2:38 PM MST	Wind Advisory	UNR	24 hr
Feb 6, 1:49 AM MST	Wind Advisory	UNR	4 hr
Feb 12, 1:19 PM MST	Winter Weather Advisory	UNR	25 hr
Feb 24, 1:59 PM MST	Winter Storm Watch	UNR	22 hr
Feb 25, 11:43 AM MST	Winter Weather Advisory	UNR	22 hr
Mar 8, 3:21 AM MDT	Winter Storm Watch	UNR	24 hr
Mar 9, 1:20 AM MDT	Winter Weather Advisory	UNR	4 hr
Mar 9, 3:23 AM MDT	Winter Storm Warning	UNR	33 hr
Mar 9, 3:23 AM MDT	Winter Weather Advisory	UNR	33 hr
Mar 9, 8:49 PM MDT	Mesoscale Discussion	SPC	4 hr
Mar 21, 3:03 AM MDT	Blizzard Watch	UNR	24 hr
Mar 22, 3:30 AM MDT	Blizzard Warning	UNR	65 hr
Mar 23, 3:59 AM MDT	Mesoscale Discussion	SPC	6 hr
Mar 23, 5:56 PM MDT	Mesoscale Discussion	SPC	3 hr
Mar 28, 2:44 AM MDT	Blizzard Watch	UNR	37 hr
Mar 28, 2:44 AM MDT	Winter Storm Watch	UNR	24 hr
Mar 29, 3:04 AM MDT	Winter Storm Watch	UNR	12 hr
Mar 29, 3:04 AM MDT	Winter Storm Warning	UNR	51 hr
Mar 30, 5:36 AM MDT	Mesoscale Discussion	SPC	4 hr
Apr 2, 4:06 AM MDT	Winter Storm Watch	UNR	25 hr
Apr 3, 4:55 AM MDT	Winter Storm Warning	UNR	41 hr
Apr 4, 4:57 AM MDT	Mesoscale Discussion	SPC	4 hr
Apr 8, 2:36 PM MDT	Winter Weather Advisory	UNR	25 hr
Apr 9, 3:07 PM MDT	Flood Watch	UNR	72 hr
Apr 12, 9:22 AM MDT	Flood Watch	UNR	4 days
Apr 16, 1:20 PM MDT	Flood Watch	UNR	5 days
Apr 16, 3:02 PM MDT	Winter Weather Advisory	UNR	12 hr
Apr 25, 3:47 AM MDT	Winter Weather Advisory	UNR	35 hr
Apr 25, 1:46 PM MDT	Winter Storm Warning	UNR	25 hr
Apr 28, 3:41 AM MDT	Wind Advisory	UNR	11 hr
May 12, 2:22 PM MDT	High Wind Warning	UNR	29 hr
May 12, 2:22 PM MDT	Wind Advisory	UNR	29 hr
May 24, 5:53 PM MDT	Areal Flood Advisory	UNR	5 hr
May 24, 6:31 PM MDT	Mesoscale Discussion	SPC	119 min
May 31, 11:39 AM MDT	Severe Thunderstorm Warning	UNR	44 min
May 31, 12:49 PM MDT	Severe Thunderstorm Warning	UNR	18 min
Jun 6, 3:18 PM MDT	Severe Thunderstorm Warning	UNR	56 min
Jun 13, 4:03 PM MDT	Severe Thunderstorm Warning	UNR	72 min
Jun 13, 4:50 PM MDT	Severe Thunderstorm Warning	UNR	70 min
Jun 13, 5:07 PM MDT	Areal Flood Advisory	UNR	6 hr
Jun 13, 5:21 PM MDT	Severe Thunderstorm Watch	SPC	8 hr
Jun 13, 6:03 PM MDT	Severe Thunderstorm Warning	UNR	58 min
Jun 13, 7:37 PM MDT	Severe Thunderstorm Warning	UNR	31 min
Jun 13, 7:58 PM MDT	Mesoscale Discussion	SPC	62 min
Jun 13, 7:58 PM MDT	Severe Thunderstorm Warning	UNR	92 min
Jun 14, 3:53 AM MDT	Flood Watch	UNR	19 hr
Jun 14, 2:22 PM MDT	Mesoscale Discussion	SPC	83 min
Jun 14, 4:09 PM MDT	Severe Thunderstorm Watch	SPC	8 hr
Jun 14, 5:12 PM MDT	Severe Thunderstorm Warning	UNR	63 min
Jun 14, 5:50 PM MDT	Flash Flood Warning	UNR	2 hr
Jun 14, 6:15 PM MDT	Severe Thunderstorm Warning	UNR	47 min
Jun 14, 6:17 PM MDT	Mesoscale Discussion	SPC	118 min
Jun 14, 6:46 PM MDT	Tornado Watch	SPC	5 hr
Jun 15, 3:48 AM MDT	Flood Watch	UNR	24 hr
Jun 17, 5:35 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 18, 11:48 AM MDT	Severe Thunderstorm Warning	UNR	57 min
Jun 18, 12:31 PM MDT	Severe Thunderstorm Warning	UNR	41 min
Jun 18, 12:32 PM MDT	Flash Flood Warning	UNR	5 hr
Jun 25, 3:49 PM MDT	Mesoscale Discussion	SPC	56 min
Jun 25, 3:50 PM MDT	Tornado Watch	SPC	5 hr
Jun 25, 5:14 PM MDT	Severe Thunderstorm Warning	UNR	61 min
Jun 25, 5:37 PM MDT	Severe Thunderstorm Warning	UNR	30 min
Jun 25, 6:33 PM MDT	Mesoscale Discussion	SPC	57 min
Jun 26, 3:04 AM MDT	Flash Flood Watch	UNR	18 hr
Jun 26, 1:13 PM MDT	Mesoscale Discussion	SPC	62 min
Jun 26, 1:53 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 29, 3:36 PM MDT	Mesoscale Discussion	SPC	84 min
Jun 30, 2:52 PM MDT	Mesoscale Discussion	SPC	83 min
Jun 30, 3:19 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 30, 6:22 PM MDT	Mesoscale Discussion	SPC	113 min
Jul 1, 12:03 PM MDT	Severe Thunderstorm Warning	UNR	57 min
Jul 1, 12:33 PM MDT	Mesoscale Discussion	SPC	117 min
Jul 2, 11:25 AM MDT	Mesoscale Discussion	SPC	65 min
Jul 2, 11:41 AM MDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 2, 12:49 PM MDT	Flash Flood Watch	UNR	15 hr
Jul 2, 1:28 PM MDT	Severe Thunderstorm Warning	UNR	62 min
Jul 2, 2:17 PM MDT	Mesoscale Discussion	SPC	88 min
Jul 2, 6:29 PM MDT	Mesoscale Discussion	SPC	61 min
Jul 8, 2:20 PM MDT	Tornado Watch	SPC	8 hr
Jul 8, 4:58 PM MDT	Severe Thunderstorm Warning	UNR	62 min
Jul 8, 5:07 PM MDT	Severe Thunderstorm Warning	UNR	53 min
Jul 8, 5:12 PM MDT	Tornado Warning	UNR	26 min
Jul 8, 5:46 PM MDT	Mesoscale Discussion	SPC	89 min
Jul 8, 5:50 PM MDT	Severe Thunderstorm Warning	UNR	55 min
Jul 8, 6:00 PM MDT	Severe Thunderstorm Warning	UNR	37 min
Jul 9, 8:59 PM MDT	Mesoscale Discussion	SPC	91 min
Jul 9, 10:08 PM MDT	Severe Thunderstorm Warning	UNR	67 min
Jul 9, 10:14 PM MDT	Severe Thunderstorm Warning	UNR	61 min
Jul 9, 11:06 PM MDT	Severe Thunderstorm Warning	UNR	54 min
Jul 9, 11:08 PM MDT	Severe Thunderstorm Warning	UNR	32 min
Jul 11, 4:53 AM MDT	Severe Thunderstorm Warning	UNR	39 min
Jul 11, 5:52 AM MDT	Severe Thunderstorm Warning	UNR	32 min
Jul 11, 6:14 AM MDT	Mesoscale Discussion	SPC	61 min
Jul 13, 12:34 PM MDT	Tornado Watch	SPC	8 hr
Jul 13, 7:03 PM MDT	Severe Thunderstorm Warning	UNR	57 min
Jul 13, 7:21 PM MDT	Severe Thunderstorm Warning	UNR	39 min
Jul 13, 7:43 PM MDT	Severe Thunderstorm Warning	UNR	62 min
Jul 13, 8:11 PM MDT	Severe Thunderstorm Warning	UNR	79 min
Jul 13, 8:58 PM MDT	Severe Thunderstorm Warning	UNR	92 min
Jul 19, 2:22 PM MDT	Mesoscale Discussion	SPC	113 min
Jul 27, 4:40 PM MDT	Severe Thunderstorm Warning	UNR	65 min
Aug 3, 6:46 PM MDT	Mesoscale Discussion	SPC	119 min
Aug 3, 6:53 PM MDT	Severe Thunderstorm Warning	UNR	67 min
Aug 4, 3:37 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Aug 4, 5:19 PM MDT	Mesoscale Discussion	SPC	56 min
Aug 4, 6:40 PM MDT	Mesoscale Discussion	SPC	65 min
Aug 4, 6:58 PM MDT	Severe Thunderstorm Warning	UNR	77 min
Aug 4, 7:54 PM MDT	Severe Thunderstorm Warning	UNR	81 min
Aug 6, 11:00 AM MDT	Flash Flood Watch	UNR	9 hr
Aug 6, 4:07 PM MDT	Tornado Watch	SPC	4 hr
Aug 6, 7:34 PM MDT	Mesoscale Discussion	SPC	86 min
Aug 7, 4:06 PM MDT	Mesoscale Discussion	SPC	84 min
Aug 7, 4:56 PM MDT	Severe Thunderstorm Watch	SPC	6 hr
Aug 8, 2:18 AM MDT	Mesoscale Discussion	SPC	117 min
Aug 8, 6:56 PM MDT	Mesoscale Discussion	SPC	94 min
Aug 15, 2:08 PM MDT	Severe Thunderstorm Watch	SPC	8 hr
Sep 10, 2:36 PM MDT	Wind Advisory	UNR	17 min
Sep 10, 2:53 PM MDT	Wind Advisory	UNR	13 hr
Sep 26, 2:39 AM MDT	Wind Advisory	UNR	39 hr
Sep 27, 2:36 AM MDT	High Wind Warning	UNR	15 hr
Sep 27, 2:34 PM MDT	Frost Advisory	UNR	17 hr
Sep 29, 3:29 AM MDT	High Wind Watch	UNR	36 hr
Sep 30, 3:26 AM MDT	High Wind Warning	UNR	42 hr
Sep 30, 3:26 AM MDT	Winter Storm Watch	UNR	12 hr
Sep 30, 3:00 PM MDT	Wind Advisory	UNR	48 hr
Sep 30, 3:04 PM MDT	Winter Weather Advisory	UNR	24 hr
Oct 2, 3:46 AM MDT	Freeze Warning	UNR	29 hr
Oct 2, 5:54 AM MDT	High Wind Warning	UNR	9 hr
Oct 3, 3:18 PM MDT	Winter Storm Watch	UNR	24 hr
Oct 4, 3:17 PM MDT	Winter Weather Advisory	UNR	19 hr
Oct 7, 3:37 AM MDT	Winter Weather Advisory	UNR	24 hr
Oct 9, 3:33 AM MDT	Wind Advisory	UNR	9 hr
Oct 10, 2:23 PM MDT	Winter Storm Watch	UNR	13 hr
Oct 11, 3:35 AM MDT	Winter Weather Advisory	UNR	24 hr
Oct 27, 3:16 PM MDT	Winter Storm Watch	UNR	13 hr
Oct 28, 4:32 AM MDT	Winter Storm Warning	UNR	46 hr
Oct 28, 4:32 AM MDT	Winter Weather Advisory	UNR	46 hr
Nov 30, 1:08 PM MST	Wind Advisory	UNR	28 hr
Dec 8, 2:33 PM MST	Wind Chill Advisory	UNR	21 hr
Dec 9, 2:55 PM MST	Wind Chill Advisory	UNR	13 hr
Dec 21, 1:28 PM MST	Winter Storm Watch	UNR	39 hr
Dec 21, 8:45 PM MST	Dense Fog Advisory	UNR	10 hr
Dec 22, 4:23 AM MST	Winter Storm Warning	UNR	5 days
Dec 22, 12:36 PM MST	Winter Weather Advisory	UNR	4 days
Dec 22, 12:49 PM MST	Freezing Fog Advisory	UNR	16 hr
Dec 24, 2:33 PM MST	Blizzard Warning	UNR	56 hr
Dec 26, 10:25 PM MST	Winter Weather Advisory	UNR	4 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	35
Tornado Warning	1
Severe Thunderstorm Watch	9
Tornado Watch	5
Mesoscale Discussion	30
Flooding
Flash Flood Warning	2
Flash Flood Watch	3
Flood Watch	5
Areal Flood Advisory	2
Winter
Blizzard Warning	2
Winter Storm Warning	6
Blizzard Watch	2
Winter Storm Watch	10
Winter Weather Advisory	19
Cold
Freeze Warning	1
Frost Advisory	1
Wind Chill Advisory	2
Wind and dust
High Wind Warning	5
High Wind Watch	2
Wind Advisory	17
Fog and smoke
Dense Fog Advisory	1
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 2008 2010

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.