Alert archive / South Dakota / Todd County

Weather alerts in Todd County, South Dakota, 2011

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

Todd County and its neighbors

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

Alerts: 162
Warnings: 69
Watches: 26
Advisories: 33
Busiest month: June47 alerts
Busiest day: June 13, 20118 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 3 tornado warnings covering Todd County in 2011 had a tornado report inside them; 0 of 1 tornado reports fell inside a warning.

Todd County, 2011

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	3	0	100%	1	0%
Severe thunderstorm warnings	49	36	27%	34	94%	31 min
Flash flood warnings	3	1	67%	1	100%	26 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, Central Time. Each opens its own page with the text, the map, the radar and the sounding.

Issued	Product	Office	Lasted
Dec 31, 11:00 PM CST	Wind Chill Advisory	UNR	12 hr
Jan 7, 3:38 AM CST	Winter Storm Watch	UNR	11 hr
Jan 7, 2:26 PM CST	Winter Weather Advisory	UNR	58 hr
Jan 10, 3:43 PM CST	Wind Chill Advisory	UNR	21 hr
Jan 16, 3:44 PM CST	Winter Weather Advisory	UNR	20 hr
Jan 29, 3:03 PM CST	Winter Weather Advisory	UNR	48 hr
Jan 31, 3:44 AM CST	Wind Chill Warning	UNR	33 hr
Feb 1, 5:09 AM CST	Wind Chill Advisory	UNR	16 hr
Feb 1, 3:54 PM CST	Wind Chill Warning	UNR	19 hr
Feb 8, 3:41 PM CST	Wind Chill Advisory	UNR	19 hr
Feb 12, 4:05 PM CST	Wind Advisory	UNR	28 hr
Feb 16, 3:39 PM CST	Wind Advisory	UNR	26 hr
Feb 18, 2:56 PM CST	Winter Storm Watch	UNR	13 hr
Feb 19, 3:35 AM CST	Winter Storm Warning	UNR	44 hr
Feb 19, 2:56 PM CST	Blizzard Warning	UNR	24 hr
Feb 19, 11:25 PM CST	Mesoscale Discussion	SPC	5 hr
Feb 20, 3:19 PM CST	Winter Weather Advisory	UNR	9 hr
Feb 23, 3:26 PM CST	Winter Weather Advisory	UNR	38 hr
Feb 24, 3:48 PM CST	Wind Chill Advisory	UNR	13 hr
Mar 5, 3:03 PM CST	Winter Storm Watch	UNR	13 hr
Mar 6, 3:40 AM CST	Winter Weather Advisory	UNR	32 hr
Mar 10, 3:57 PM CST	Wind Advisory	UNR	27 hr
Mar 19, 4:00 AM CDT	Wind Advisory	UNR	15 hr
Mar 25, 4:18 AM CDT	Winter Weather Advisory	UNR	39 hr
Apr 2, 3:52 PM CDT	Wind Advisory	UNR	33 hr
Apr 13, 5:32 AM CDT	Winter Storm Watch	UNR	24 hr
Apr 14, 5:07 AM CDT	Winter Storm Warning	UNR	35 hr
Apr 14, 6:19 PM CDT	Mesoscale Discussion	SPC	4 hr
Apr 21, 5:03 AM CDT	Wind Advisory	UNR	10 hr
Apr 21, 3:48 PM CDT	Wind Advisory	UNR	33 hr
Apr 22, 2:48 PM CDT	High Wind Warning	UNR	5 hr
Apr 29, 4:22 PM CDT	High Wind Watch	UNR	11 hr
Apr 30, 3:44 AM CDT	High Wind Warning	UNR	16 hr
Apr 30, 3:44 AM CDT	Wind Advisory	UNR	6 hr
Apr 30, 7:55 PM CDT	High Wind Warning	UNR	2 hr
May 8, 5:06 PM CDT	Mesoscale Discussion	SPC	54 min
May 8, 6:13 PM CDT	Tornado Watch	SPC	6 hr
May 9, 11:17 PM CDT	Mesoscale Discussion	SPC	58 min
Jun 6, 4:14 PM CDT	Severe Thunderstorm Warning	UNR	61 min
Jun 6, 4:38 PM CDT	Severe Thunderstorm Warning	UNR	37 min
Jun 6, 4:50 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 6, 5:08 PM CDT	Severe Thunderstorm Warning	UNR	52 min
Jun 6, 5:54 PM CDT	Severe Thunderstorm Warning	UNR	51 min
Jun 6, 5:58 PM CDT	Severe Thunderstorm Warning	UNR	28 min
Jun 6, 8:10 PM CDT	Mesoscale Discussion	SPC	95 min
Jun 12, 7:07 PM CDT	Mesoscale Discussion	SPC	53 min
Jun 12, 7:33 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 12, 9:55 PM CDT	Mesoscale Discussion	SPC	65 min
Jun 13, 12:47 AM CDT	Severe Thunderstorm Warning	UNR	58 min
Jun 13, 1:36 AM CDT	Severe Thunderstorm Warning	UNR	54 min
Jun 13, 1:44 AM CDT	Mesoscale Discussion	SPC	61 min
Jun 13, 2:53 PM CDT	Mesoscale Discussion	SPC	2 hr
Jun 13, 5:24 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 13, 8:16 PM CDT	Severe Thunderstorm Warning	UNR	27 min
Jun 13, 9:44 PM CDT	Mesoscale Discussion	SPC	91 min
Jun 14, 1:54 PM CDT	Tornado Warning	UNR	36 min
Jun 14, 2:29 PM CDT	Severe Thunderstorm Warning	UNR	46 min
Jun 16, 2:55 PM CDT	Severe Thunderstorm Watch	SPC	9 hr
Jun 16, 5:38 PM CDT	Severe Thunderstorm Warning	UNR	82 min
Jun 16, 5:49 PM CDT	Mesoscale Discussion	SPC	86 min
Jun 16, 6:01 PM CDT	Severe Thunderstorm Warning	UNR	59 min
Jun 16, 6:44 PM CDT	Areal Flood Advisory	UNR	3 hr
Jun 16, 6:53 PM CDT	Severe Thunderstorm Warning	UNR	67 min
Jun 16, 7:25 PM CDT	Flash Flood Warning	UNR	3 hr
Jun 16, 7:29 PM CDT	Severe Thunderstorm Warning	UNR	61 min
Jun 16, 8:09 PM CDT	Severe Thunderstorm Warning	UNR	66 min
Jun 16, 8:26 PM CDT	Mesoscale Discussion	SPC	64 min
Jun 16, 9:04 PM CDT	Severe Thunderstorm Warning	UNR	71 min
Jun 16, 10:30 PM CDT	Areal Flood Advisory	UNR	12 hr
Jun 18, 6:09 PM CDT	Severe Thunderstorm Warning	UNR	54 min
Jun 19, 5:18 AM CDT	Flash Flood Watch	UNR	47 hr
Jun 20, 12:53 AM CDT	Areal Flood Warning	UNR	36 hr
Jun 21, 12:36 PM CDT	Areal Flood Advisory	UNR	24 hr
Jun 24, 5:57 PM CDT	Mesoscale Discussion	SPC	2 hr
Jun 24, 6:46 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 25, 6:21 PM CDT	Mesoscale Discussion	SPC	84 min
Jun 25, 8:14 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 25, 11:27 PM CDT	Mesoscale Discussion	SPC	63 min
Jun 26, 6:08 AM CDT	Mesoscale Discussion	SPC	97 min
Jun 26, 10:44 AM CDT	Mesoscale Discussion	SPC	2 hr
Jun 26, 1:03 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 26, 2:30 PM CDT	Mesoscale Discussion	SPC	2 hr
Jun 30, 3:19 PM CDT	Mesoscale Discussion	SPC	56 min
Jun 30, 5:17 PM CDT	Mesoscale Discussion	SPC	118 min
Jun 30, 5:39 PM CDT	Severe Thunderstorm Watch	SPC	5 hr
Jun 30, 8:31 PM CDT	Severe Thunderstorm Warning	UNR	59 min
Jun 30, 9:14 PM CDT	Severe Thunderstorm Warning	UNR	61 min
Jul 4, 4:25 AM CDT	Flash Flood Watch	UNR	24 hr
Jul 4, 4:45 PM CDT	Severe Thunderstorm Watch	SPC	8 hr
Jul 4, 7:59 PM CDT	Mesoscale Discussion	SPC	2 hr
Jul 4, 9:39 PM CDT	Severe Thunderstorm Warning	UNR	81 min
Jul 4, 10:17 PM CDT	Severe Thunderstorm Warning	UNR	88 min
Jul 4, 11:14 PM CDT	Mesoscale Discussion	SPC	91 min
Jul 8, 4:29 PM CDT	Mesoscale Discussion	SPC	2 hr
Jul 8, 4:48 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 15, 4:20 AM CDT	Excessive Heat Warning	UNR	5 days
Jul 21, 7:10 PM CDT	Mesoscale Discussion	SPC	95 min
Jul 22, 6:06 PM CDT	Severe Thunderstorm Warning	UNR	54 min
Jul 22, 6:22 PM CDT	Mesoscale Discussion	SPC	53 min
Jul 22, 6:29 PM CDT	Flash Flood Warning	UNR	3 hr
Jul 22, 7:10 PM CDT	Severe Thunderstorm Warning	UNR	65 min
Jul 22, 7:39 PM CDT	Flash Flood Warning	UNR	3 hr
Jul 22, 8:14 PM CDT	Severe Thunderstorm Warning	UNR	61 min
Jul 22, 8:58 PM CDT	Severe Thunderstorm Warning	UNR	42 min
Jul 22, 9:22 PM CDT	Areal Flood Warning	UNR	6 hr
Jul 25, 2:30 PM CDT	Severe Thunderstorm Watch	SPC	8 hr
Jul 25, 7:15 PM CDT	Severe Thunderstorm Warning	UNR	60 min
Jul 25, 8:15 PM CDT	Severe Thunderstorm Warning	UNR	28 min
Jul 26, 5:06 PM CDT	Mesoscale Discussion	SPC	84 min
Jul 26, 5:43 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 26, 6:25 PM CDT	Severe Thunderstorm Warning	UNR	65 min
Jul 26, 7:00 PM CDT	Severe Thunderstorm Warning	UNR	47 min
Jul 27, 10:27 PM CDT	Severe Thunderstorm Warning	UNR	63 min
Jul 31, 5:31 AM CDT	Heat Advisory	UNR	38 hr
Aug 7, 1:23 PM CDT	Mesoscale Discussion	SPC	67 min
Aug 7, 2:58 PM CDT	Severe Thunderstorm Watch	SPC	8 hr
Aug 7, 6:35 PM CDT	Mesoscale Discussion	SPC	115 min
Aug 7, 6:37 PM CDT	Severe Thunderstorm Warning	UNR	53 min
Aug 7, 6:49 PM CDT	Severe Thunderstorm Warning	UNR	56 min
Aug 7, 7:02 PM CDT	Severe Thunderstorm Warning	UNR	43 min
Aug 7, 7:31 PM CDT	Severe Thunderstorm Warning	UNR	59 min
Aug 10, 3:57 PM CDT	Severe Thunderstorm Warning	UNR	63 min
Aug 10, 4:54 PM CDT	Severe Thunderstorm Warning	UNR	96 min
Aug 11, 3:05 PM CDT	Tornado Watch	SPC	5 hr
Aug 11, 5:28 PM CDT	Severe Thunderstorm Warning	UNR	62 min
Aug 11, 6:16 PM CDT	Severe Thunderstorm Warning	UNR	59 min
Aug 17, 3:00 PM CDT	Mesoscale Discussion	SPC	2 hr
Aug 17, 3:37 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Aug 17, 5:43 PM CDT	Mesoscale Discussion	SPC	62 min
Aug 17, 5:59 PM CDT	Severe Thunderstorm Warning	UNR	61 min
Aug 17, 6:11 PM CDT	Severe Thunderstorm Warning	UNR	64 min
Aug 17, 7:06 PM CDT	Severe Thunderstorm Warning	UNR	54 min
Aug 17, 7:34 PM CDT	Tornado Warning	UNR	32 min
Aug 17, 7:55 PM CDT	Severe Thunderstorm Warning	UNR	65 min
Aug 17, 8:01 PM CDT	Severe Thunderstorm Warning	UNR	59 min
Aug 17, 8:31 PM CDT	Severe Thunderstorm Warning	UNR	59 min
Aug 17, 9:18 PM CDT	Mesoscale Discussion	SPC	57 min
Aug 18, 4:45 PM CDT	Severe Thunderstorm Watch	SPC	4 hr
Aug 21, 3:39 AM CDT	Severe Thunderstorm Warning	UNR	66 min
Sep 3, 1:20 AM CDT	Mesoscale Discussion	SPC	85 min
Sep 3, 1:28 AM CDT	Severe Thunderstorm Warning	UNR	62 min
Sep 3, 3:38 AM CDT	Severe Thunderstorm Warning	UNR	38 min
Sep 19, 3:15 PM CDT	Wind Advisory	UNR	24 hr
Sep 29, 12:03 PM CDT	Frost Advisory	UNR	21 hr
Oct 5, 5:06 AM CDT	Wind Advisory	UNR	14 hr
Oct 5, 4:09 PM CDT	Wind Advisory	UNR	27 hr
Oct 6, 4:45 AM CDT	High Wind Warning	UNR	14 hr
Oct 6, 3:18 PM CDT	Wind Advisory	UNR	29 hr
Oct 6, 3:32 PM CDT	Severe Thunderstorm Watch	SPC	9 hr
Oct 6, 5:55 PM CDT	Mesoscale Discussion	SPC	95 min
Oct 6, 6:43 PM CDT	Severe Thunderstorm Warning	UNR	47 min
Oct 6, 7:23 PM CDT	Tornado Warning	UNR	52 min
Oct 6, 8:00 PM CDT	Severe Thunderstorm Warning	UNR	45 min
Oct 6, 8:45 PM CDT	Mesoscale Discussion	SPC	90 min
Oct 6, 10:02 PM CDT	Severe Thunderstorm Warning	UNR	58 min
Oct 17, 3:52 PM CDT	Freeze Warning	UNR	18 hr
Nov 4, 3:50 AM CDT	Wind Advisory	UNR	14 hr
Nov 18, 1:19 PM CST	Winter Weather Advisory	UNR	26 hr
Nov 24, 3:18 PM CST	High Wind Watch	UNR	25 hr
Nov 25, 3:28 AM CST	Wind Advisory	UNR	37 hr
Nov 25, 4:02 PM CST	High Wind Warning	UNR	24 hr
Dec 30, 3:36 PM CST	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	49
Tornado Warning	3
Severe Thunderstorm Watch	16
Tornado Watch	2
Mesoscale Discussion	34
Flooding
Areal Flood Warning	2
Flash Flood Warning	3
Flash Flood Watch	2
Areal Flood Advisory	3
Winter
Blizzard Warning	1
Winter Storm Warning	2
Winter Storm Watch	4
Winter Weather Advisory	8
Heat
Excessive Heat Warning	1
Heat Advisory	1
Cold
Freeze Warning	1
Wind Chill Warning	2
Frost Advisory	1
Wind Chill Advisory	5
Wind and dust
High Wind Warning	5
High Wind Watch	2
Wind Advisory	15

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.