Alert archive / South Dakota / Brown County

Weather alerts in Brown County, South Dakota, 2011

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

Brown County and its neighbors

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

Alerts: 160
Warnings: 57
Watches: 21
Advisories: 46
Busiest month: July56 alerts
Busiest day: July 5, 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 1 tornado warnings covering Brown County in 2011 had a tornado report inside them.

Brown County, 2011

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	1	0	100%	0
Severe thunderstorm warnings	25	16	36%	13	92%	35 min
Flash flood warnings	5	4	20%	6	50%	58 min

Each office's whole area, 2011

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Aberdeen, SD: tornado warnings	23	5	78%	11	45%	8 min
NWS Aberdeen, SD: severe thunderstorm warnings	224	147	34%	242	85%	21 min
NWS Aberdeen, SD: flash flood warnings	18	9	50%	17	71%	202 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
Jan 11, 3:24 PM CST	Wind Chill Advisory	ABR	6 hr
Jan 18, 5:28 AM CST	Wind Chill Advisory	ABR	7 hr
Jan 19, 3:33 PM CST	Winter Weather Advisory	ABR	17 hr
Jan 20, 9:00 AM CST	Wind Chill Advisory	ABR	12 hr
Jan 22, 8:15 PM CST	Wind Chill Advisory	ABR	4 hr
Jan 23, 8:17 AM CST	Wind Chill Advisory	ABR	4 hr
Jan 29, 3:26 PM CST	Winter Weather Advisory	ABR	46 hr
Jan 31, 10:46 AM CST	Wind Chill Advisory	ABR	31 hr
Feb 1, 3:00 AM CST	Wind Chill Warning	ABR	33 hr
Feb 4, 3:36 PM CST	Winter Weather Advisory	ABR	28 hr
Feb 7, 3:42 AM CST	Wind Chill Advisory	ABR	32 hr
Feb 8, 3:55 AM CST	Wind Chill Warning	ABR	8 hr
Feb 8, 4:16 PM CST	Wind Chill Advisory	ABR	19 hr
Feb 10, 3:22 AM CST	Wind Chill Advisory	ABR	6 hr
Feb 12, 12:07 PM CST	High Wind Watch	ABR	16 hr
Feb 13, 4:01 AM CST	High Wind Warning	ABR	17 hr
Feb 13, 9:07 PM CST	Wind Advisory	ABR	3 hr
Feb 17, 4:06 AM CST	Wind Advisory	ABR	15 hr
Feb 18, 3:49 AM CST	Winter Storm Watch	ABR	24 hr
Feb 19, 3:29 AM CST	Winter Storm Warning	ABR	11 hr
Feb 19, 2:48 PM CST	Blizzard Warning	ABR	37 hr
Feb 20, 9:17 AM CST	Mesoscale Discussion	SPC	4 hr
Feb 23, 5:31 AM CST	Dense Fog Advisory	ABR	5 hr
Mar 8, 9:27 AM CST	Winter Weather Advisory	ABR	18 hr
Mar 11, 3:54 AM CST	Wind Advisory	ABR	14 hr
Mar 11, 2:59 PM CST	Winter Weather Advisory	ABR	2 hr
Mar 11, 5:24 PM CST	Blizzard Warning	ABR	13 hr
Mar 14, 8:54 AM CDT	Dense Fog Advisory	ABR	2 hr
Mar 20, 7:20 AM CDT	Areal Flood Warning	ABR	24 hr
Mar 20, 8:22 AM CDT	Dense Fog Advisory	ABR	7 hr
Mar 21, 7:06 AM CDT	Areal Flood Warning	ABR	60 hr
Mar 21, 9:28 PM CDT	River Flood Warning	ABR	242 days
Mar 22, 10:34 AM CDT	Winter Storm Warning	ABR	28 hr
Mar 22, 12:32 PM CDT	River Flood Warning	ABR	46 hr
Mar 22, 2:25 PM CDT	Mesoscale Discussion	SPC	4 hr
Mar 24, 11:36 PM CDT	Areal Flood Warning	ABR	48 hr
Mar 26, 9:59 AM CDT	River Flood Warning	ABR	23 hr
Apr 2, 2:59 PM CDT	Wind Advisory	ABR	44 hr
Apr 3, 10:30 AM CDT	River Flood Warning	ABR	5 days
Apr 3, 2:24 PM CDT	Areal Flood Warning	ABR	4 days
Apr 9, 5:04 AM CDT	Dense Fog Advisory	ABR	5 hr
Apr 10, 3:52 PM CDT	Areal Flood Advisory	ABR	6 hr
Apr 13, 3:42 AM CDT	Winter Storm Watch	ABR	24 hr
Apr 14, 3:24 AM CDT	Winter Storm Warning	ABR	43 hr
Apr 18, 3:33 PM CDT	Winter Weather Advisory	ABR	30 hr
Apr 21, 3:12 AM CDT	Wind Advisory	ABR	12 hr
Apr 29, 4:07 AM CDT	Wind Advisory	ABR	15 hr
Apr 30, 4:14 AM CDT	Wind Advisory	ABR	39 hr
May 9, 11:24 PM CDT	Severe Thunderstorm Warning	ABR	51 min
May 15, 3:23 PM CDT	Frost Advisory	ABR	13 hr
May 21, 5:41 PM CDT	Severe Thunderstorm Warning	ABR	64 min
May 21, 6:23 PM CDT	Severe Thunderstorm Warning	ABR	37 min
May 30, 2:46 AM CDT	Flash Flood Watch	ABR	18 hr
May 30, 2:59 AM CDT	High Wind Watch	ABR	24 hr
May 30, 6:17 PM CDT	Mesoscale Discussion	SPC	118 min
May 30, 6:40 PM CDT	Severe Thunderstorm Warning	ABR	35 min
May 31, 2:29 AM CDT	Wind Advisory	ABR	18 hr
Jun 7, 2:51 PM CDT	Mesoscale Discussion	SPC	114 min
Jun 12, 7:07 PM CDT	Mesoscale Discussion	SPC	53 min
Jun 16, 3:52 PM CDT	Flash Flood Watch	ABR	30 hr
Jun 19, 3:38 AM CDT	Flash Flood Watch	ABR	57 hr
Jun 21, 4:27 PM CDT	Areal Flood Warning	ABR	48 hr
Jun 22, 11:59 AM CDT	River Flood Warning	ABR	5 days
Jun 23, 3:33 PM CDT	Areal Flood Warning	ABR	6 days
Jun 25, 3:33 PM CDT	Flash Flood Watch	ABR	27 hr
Jun 26, 12:35 PM CDT	Mesoscale Discussion	SPC	85 min
Jun 29, 4:11 PM CDT	Heat Advisory	ABR	27 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, 9:10 PM CDT	Severe Thunderstorm Warning	ABR	50 min
Jul 4, 9:35 PM CDT	Severe Thunderstorm Warning	ABR	55 min
Jul 4, 10:00 PM CDT	Flash Flood Warning	ABR	3 hr
Jul 4, 10:23 PM CDT	Severe Thunderstorm Warning	ABR	67 min
Jul 4, 11:14 PM CDT	Flash Flood Warning	ABR	3 hr
Jul 4, 11:14 PM CDT	Mesoscale Discussion	SPC	91 min
Jul 4, 11:17 PM CDT	Severe Thunderstorm Warning	ABR	45 min
Jul 4, 11:41 PM CDT	Severe Thunderstorm Watch	SPC	5 hr
Jul 5, 12:50 AM CDT	Severe Thunderstorm Warning	ABR	55 min
Jul 5, 1:35 AM CDT	Severe Thunderstorm Warning	ABR	45 min
Jul 5, 1:53 AM CDT	Flash Flood Warning	ABR	97 min
Jul 5, 3:19 AM CDT	Areal Flood Warning	ABR	13 days
Jul 8, 4:29 PM CDT	Mesoscale Discussion	SPC	2 hr
Jul 8, 10:54 PM CDT	Severe Thunderstorm Warning	ABR	51 min
Jul 8, 11:26 PM CDT	Tornado Warning	ABR	34 min
Jul 8, 11:35 PM CDT	Severe Thunderstorm Warning	ABR	40 min
Jul 9, 6:09 PM CDT	Mesoscale Discussion	SPC	66 min
Jul 10, 10:32 AM CDT	Mesoscale Discussion	SPC	118 min
Jul 10, 2:29 PM CDT	Tornado Watch	SPC	7 hr
Jul 10, 4:12 PM CDT	Severe Thunderstorm Warning	ABR	63 min
Jul 10, 4:32 PM CDT	Severe Thunderstorm Warning	ABR	43 min
Jul 10, 5:08 PM CDT	Severe Thunderstorm Warning	ABR	52 min
Jul 10, 5:25 PM CDT	Mesoscale Discussion	SPC	95 min
Jul 10, 5:47 PM CDT	Severe Thunderstorm Warning	ABR	58 min
Jul 10, 6:01 PM CDT	Flash Flood Warning	ABR	4 hr
Jul 10, 6:42 PM CDT	Severe Thunderstorm Warning	ABR	33 min
Jul 14, 11:53 AM CDT	Flash Flood Watch	ABR	15 hr
Jul 14, 3:55 PM CDT	Mesoscale Discussion	SPC	2 hr
Jul 14, 11:55 PM CDT	Mesoscale Discussion	SPC	65 min
Jul 15, 3:15 AM CDT	Excessive Heat Warning	ABR	5 days
Jul 16, 6:47 AM CDT	Dense Fog Advisory	ABR	3 hr
Jul 17, 6:34 PM CDT	Mesoscale Discussion	SPC	56 min
Jul 18, 3:44 AM CDT	Areal Flood Warning	ABR	36 hr
Jul 22, 5:46 PM CDT	Mesoscale Discussion	SPC	89 min
Jul 22, 6:14 PM CDT	Tornado Watch	SPC	8 hr
Jul 23, 1:06 AM CDT	Severe Thunderstorm Warning	ABR	54 min
Jul 23, 1:25 AM CDT	Mesoscale Discussion	SPC	35 min
Jul 23, 1:41 AM CDT	Severe Thunderstorm Watch	SPC	5 hr
Jul 23, 2:00 AM CDT	Severe Thunderstorm Warning	ABR	45 min
Jul 24, 3:46 AM CDT	Dense Fog Advisory	ABR	4 hr
Jul 26, 3:59 PM CDT	Mesoscale Discussion	SPC	2 hr
Jul 26, 5:21 PM CDT	Tornado Watch	SPC	5 hr
Jul 26, 7:34 PM CDT	Severe Thunderstorm Warning	ABR	56 min
Jul 26, 7:54 PM CDT	Severe Thunderstorm Warning	ABR	66 min
Jul 26, 8:10 PM CDT	Mesoscale Discussion	SPC	95 min
Jul 26, 9:04 PM CDT	Severe Thunderstorm Warning	ABR	41 min
Jul 26, 9:11 PM CDT	Flash Flood Warning	ABR	6 hr
Jul 28, 2:05 PM CDT	Mesoscale Discussion	SPC	115 min
Jul 29, 11:52 PM CDT	Mesoscale Discussion	SPC	83 min
Jul 30, 12:15 AM CDT	Severe Thunderstorm Warning	ABR	22 min
Jul 30, 5:47 AM CDT	Mesoscale Discussion	SPC	88 min
Jul 30, 3:22 PM CDT	Mesoscale Discussion	SPC	53 min
Jul 30, 3:56 PM CDT	Heat Advisory	ABR	54 hr
Jul 31, 12:50 PM CDT	Mesoscale Discussion	SPC	2 hr
Aug 1, 5:57 PM CDT	Mesoscale Discussion	SPC	2 hr
Aug 1, 6:10 PM CDT	Mesoscale Discussion	SPC	2 hr
Aug 5, 6:26 PM CDT	Mesoscale Discussion	SPC	94 min
Aug 5, 7:32 PM CDT	Severe Thunderstorm Watch	SPC	4 hr
Aug 5, 10:08 PM CDT	Mesoscale Discussion	SPC	2 hr
Aug 11, 1:49 PM CDT	Mesoscale Discussion	SPC	86 min
Aug 12, 1:18 PM CDT	Mesoscale Discussion	SPC	57 min
Aug 12, 1:47 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Aug 12, 3:44 PM CDT	Mesoscale Discussion	SPC	91 min
Aug 14, 12:46 PM CDT	Mesoscale Discussion	SPC	59 min
Aug 14, 8:42 PM CDT	Mesoscale Discussion	SPC	93 min
Aug 18, 3:43 PM CDT	Mesoscale Discussion	SPC	92 min
Aug 18, 4:45 PM CDT	Severe Thunderstorm Watch	SPC	4 hr
Aug 23, 12:53 AM CDT	Severe Thunderstorm Warning	ABR	37 min
Aug 23, 1:15 AM CDT	Severe Thunderstorm Warning	ABR	45 min
Aug 28, 2:09 AM CDT	Mesoscale Discussion	SPC	66 min
Aug 31, 4:03 AM CDT	Dense Fog Advisory	ABR	6 hr
Sep 13, 3:42 AM CDT	Freeze Watch	ABR	12 hr
Sep 13, 3:20 PM CDT	Freeze Warning	ABR	41 hr
Sep 19, 3:13 AM CDT	High Wind Watch	ABR	12 hr
Sep 19, 3:03 PM CDT	High Wind Warning	ABR	24 hr
Sep 19, 3:03 PM CDT	Wind Advisory	ABR	31 hr
Oct 4, 3:14 PM CDT	Wind Advisory	ABR	68 hr
Oct 6, 3:04 PM CDT	High Wind Warning	ABR	29 hr
Nov 4, 3:38 AM CDT	Wind Advisory	ABR	14 hr
Nov 4, 3:38 AM CDT	Wind Advisory	ABR	39 hr
Nov 6, 3:19 AM CST	Wind Advisory	ABR	15 hr
Nov 15, 3:35 AM CST	Wind Advisory	ABR	13 hr
Nov 17, 2:46 PM CST	Winter Storm Watch	ABR	25 hr
Nov 18, 2:43 PM CST	Winter Storm Warning	ABR	24 hr
Nov 19, 6:11 AM CST	Mesoscale Discussion	SPC	4 hr
Nov 19, 10:08 AM CST	Winter Weather Advisory	ABR	5 hr
Nov 22, 5:45 AM CST	Dense Fog Advisory	ABR	4 hr
Nov 25, 2:59 AM CST	Wind Advisory	ABR	39 hr
Dec 14, 5:48 AM CST	Dense Fog Advisory	ABR	5 hr
Dec 25, 3:09 PM CST	Wind Advisory	ABR	29 hr
Dec 30, 2:09 PM CST	Wind Advisory	ABR	52 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	25
Tornado Warning	1
Severe Thunderstorm Watch	6
Tornado Watch	3
Mesoscale Discussion	36
Flooding
Areal Flood Warning	8
Flash Flood Warning	5
River Flood Warning	5
Flash Flood Watch	5
Areal Flood Advisory	1
Winter
Blizzard Warning	2
Winter Storm Warning	4
Winter Storm Watch	3
Winter Weather Advisory	7
Heat
Excessive Heat Warning	1
Heat Advisory	2
Cold
Freeze Warning	1
Wind Chill Warning	2
Freeze Watch	1
Frost Advisory	1
Wind Chill Advisory	9
Wind and dust
High Wind Warning	3
High Wind Watch	3
Wind Advisory	17
Fog and smoke
Dense Fog Advisory	9

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.