Alert archive / South Dakota / Lyman County

Weather alerts in Lyman County, South Dakota, 2018

149 weather alerts in 2018, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Lyman County and its neighbors

Each county as a circle sized by its count in 2018. Tap one for its archive.

Alerts: 149
Warnings: 51
Watches: 20
Advisories: 29
Busiest month: June41 alerts
Busiest day: June 27, 201815 alerts

Over time

By month

Warning verification

How often warnings here had a storm report inside them, and how much warning the reports had.

Lyman County, 2018

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	0			0
Severe thunderstorm warnings	38	26	32%	31	90%	14 min
Flash flood warnings	1	1	0%	1	100%	42 min

Each office's whole area, 2018

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Aberdeen, SD: tornado warnings	7	2	71%	9	33%	8 min
NWS Aberdeen, SD: severe thunderstorm warnings	233	158	32%	290	82%	17 min
NWS Aberdeen, SD: flash flood warnings	12	11	8%	16	69%	142 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 1, 11:55 AM CST	Wind Chill Advisory	ABR	22 hr
Jan 9, 4:18 AM CST	Winter Weather Advisory	ABR	50 hr
Jan 14, 3:25 AM CST	Wind Chill Advisory	ABR	56 hr
Jan 20, 3:38 AM CST	Winter Storm Watch	ABR	24 hr
Jan 20, 2:19 PM CST	Winter Storm Warning	ABR	37 hr
Feb 7, 3:01 PM CST	Winter Weather Advisory	ABR	33 hr
Feb 9, 3:12 PM CST	Wind Chill Advisory	ABR	19 hr
Feb 17, 3:08 PM CST	Winter Storm Watch	ABR	20 hr
Feb 18, 11:15 AM CST	Winter Storm Warning	ABR	43 hr
Feb 20, 2:53 PM CST	Wind Chill Advisory	ABR	19 hr
Feb 21, 2:38 PM CST	Winter Weather Advisory	ABR	36 hr
Feb 23, 1:45 PM CST	Winter Weather Advisory	ABR	31 hr
Feb 28, 2:07 AM CST	Dense Fog Advisory	ABR	8 hr
Mar 2, 2:58 PM CST	Winter Storm Watch	ABR	47 hr
Mar 3, 2:07 PM CST	Dense Fog Advisory	ABR	22 hr
Mar 4, 4:40 AM CST	Blizzard Warning	ABR	55 hr
Mar 15, 3:46 AM CDT	Winter Storm Watch	ABR	11 hr
Mar 15, 3:46 AM CDT	Winter Weather Advisory	ABR	45 hr
Mar 15, 2:42 PM CDT	Winter Storm Warning	ABR	28 hr
Mar 16, 4:04 AM CDT	Mesoscale Discussion	SPC	4 hr
Mar 25, 5:47 AM CDT	Winter Weather Advisory	ABR	6 hr
Mar 30, 1:15 PM CDT	Wind Advisory	ABR	21 hr
Apr 2, 4:12 AM CDT	Winter Weather Advisory	ABR	36 hr
Apr 10, 2:36 PM CDT	Winter Storm Watch	ABR	49 hr
Apr 12, 11:48 AM CDT	Blizzard Warning	ABR	55 hr
Apr 17, 2:27 AM CDT	Winter Weather Advisory	ABR	24 hr
Apr 29, 3:52 AM CDT	Wind Advisory	ABR	16 hr
May 7, 7:17 PM CDT	Mesoscale Discussion	SPC	118 min
May 17, 2:23 PM CDT	Severe Thunderstorm Watch	SPC	10 hr
May 17, 8:11 PM CDT	Mesoscale Discussion	SPC	64 min
May 17, 8:47 PM CDT	Severe Thunderstorm Warning	ABR	43 min
May 17, 9:21 PM CDT	Severe Thunderstorm Warning	ABR	39 min
May 17, 9:55 PM CDT	Severe Thunderstorm Warning	ABR	50 min
May 17, 10:03 PM CDT	Mesoscale Discussion	SPC	117 min
May 17, 10:42 PM CDT	Severe Thunderstorm Warning	ABR	63 min
May 23, 1:40 AM CDT	Special Weather Statement	ABR	65 min
May 23, 2:36 PM CDT	Mesoscale Discussion	SPC	114 min
May 23, 8:28 PM CDT	Mesoscale Discussion	SPC	92 min
May 24, 5:11 PM CDT	Special Weather Statement	ABR	34 min
May 24, 5:18 PM CDT	Severe Thunderstorm Warning	ABR	42 min
May 24, 5:59 PM CDT	Special Weather Statement	ABR	31 min
May 24, 6:55 PM CDT	Severe Thunderstorm Warning	ABR	35 min
May 27, 6:06 PM CDT	Mesoscale Discussion	SPC	84 min
May 27, 6:27 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
May 27, 9:22 PM CDT	Severe Thunderstorm Warning	ABR	38 min
Jun 1, 2:53 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 1, 6:32 PM CDT	Mesoscale Discussion	SPC	88 min
Jun 1, 7:07 PM CDT	Special Weather Statement	ABR	53 min
Jun 1, 8:14 PM CDT	Severe Thunderstorm Warning	ABR	46 min
Jun 2, 2:56 AM CDT	Wind Advisory	ABR	16 hr
Jun 6, 12:32 AM CDT	High Wind Warning	ABR	3 hr
Jun 6, 11:17 PM CDT	Special Weather Statement	ABR	43 min
Jun 8, 2:36 AM CDT	Severe Thunderstorm Warning	ABR	39 min
Jun 8, 3:17 AM CDT	Special Weather Statement	ABR	58 min
Jun 8, 5:55 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 8, 8:25 PM CDT	Severe Thunderstorm Warning	ABR	50 min
Jun 8, 8:40 PM CDT	Mesoscale Discussion	SPC	95 min
Jun 8, 9:04 PM CDT	Severe Thunderstorm Warning	ABR	26 min
Jun 8, 9:29 PM CDT	Severe Thunderstorm Warning	ABR	46 min
Jun 10, 10:21 PM CDT	Mesoscale Discussion	SPC	54 min
Jun 11, 3:14 AM CDT	Special Weather Statement	ABR	46 min
Jun 11, 3:39 AM CDT	Severe Thunderstorm Warning	ABR	36 min
Jun 11, 4:07 AM CDT	Severe Thunderstorm Warning	ABR	23 min
Jun 16, 3:00 PM CDT	Flash Flood Watch	ABR	15 hr
Jun 16, 3:15 PM CDT	Mesoscale Discussion	SPC	90 min
Jun 16, 3:54 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 16, 6:14 PM CDT	Mesoscale Discussion	SPC	91 min
Jun 16, 7:59 PM CDT	Mesoscale Discussion	SPC	91 min
Jun 16, 9:50 PM CDT	Mesoscale Discussion	SPC	85 min
Jun 20, 9:54 AM CDT	River Flood Warning	UNR	4 days
Jun 26, 11:52 PM CDT	Mesoscale Discussion	SPC	113 min
Jun 27, 12:12 AM CDT	Severe Thunderstorm Watch	SPC	9 hr
Jun 27, 2:18 AM CDT	Mesoscale Discussion	SPC	87 min
Jun 27, 4:13 AM CDT	Severe Thunderstorm Warning	ABR	47 min
Jun 27, 4:18 AM CDT	Mesoscale Discussion	SPC	87 min
Jun 27, 4:49 AM CDT	Severe Thunderstorm Warning	ABR	26 min
Jun 27, 6:13 AM CDT	Severe Thunderstorm Warning	ABR	32 min
Jun 27, 6:30 AM CDT	Severe Thunderstorm Warning	ABR	30 min
Jun 27, 6:43 AM CDT	Severe Thunderstorm Warning	ABR	17 min
Jun 27, 6:53 AM CDT	Severe Thunderstorm Warning	ABR	37 min
Jun 27, 7:25 AM CDT	Severe Thunderstorm Warning	ABR	50 min
Jun 27, 7:25 AM CDT	Mesoscale Discussion	SPC	95 min
Jun 27, 8:13 AM CDT	Severe Thunderstorm Warning	ABR	17 min
Jun 27, 9:34 AM CDT	Areal Flood Warning	ABR	3 hr
Jun 27, 10:03 AM CDT	Flash Flood Warning	ABR	3 hr
Jun 29, 6:19 PM CDT	Severe Thunderstorm Watch	SPC	8 hr
Jul 3, 3:31 AM CDT	Heat Advisory	ABR	16 hr
Jul 6, 2:53 PM CDT	Heat Advisory	ABR	29 hr
Jul 7, 3:08 AM CDT	Heat Advisory	ABR	41 hr
Jul 10, 3:06 PM CDT	Heat Advisory	ABR	29 hr
Jul 16, 7:40 PM CDT	Special Weather Statement	ABR	50 min
Jul 16, 7:54 PM CDT	Severe Thunderstorm Warning	ABR	14 min
Jul 18, 11:17 AM CDT	Special Weather Statement	ABR	43 min
Jul 18, 11:27 AM CDT	Severe Thunderstorm Warning	ABR	27 min
Jul 18, 1:39 PM CDT	Mesoscale Discussion	SPC	2 hr
Jul 18, 3:43 PM CDT	Tornado Watch	SPC	7 hr
Jul 18, 5:16 PM CDT	Mesoscale Discussion	SPC	119 min
Jul 18, 5:29 PM CDT	Special Weather Statement	ABR	61 min
Jul 18, 6:05 PM CDT	Special Weather Statement	ABR	25 min
Jul 18, 6:18 PM CDT	Severe Thunderstorm Warning	ABR	42 min
Jul 18, 6:34 PM CDT	Special Weather Statement	ABR	41 min
Jul 18, 6:43 PM CDT	Severe Thunderstorm Warning	ABR	47 min
Jul 18, 7:03 PM CDT	Special Weather Statement	ABR	27 min
Jul 18, 7:42 PM CDT	Severe Thunderstorm Warning	ABR	33 min
Jul 22, 1:55 PM CDT	Mesoscale Discussion	SPC	3 hr
Jul 22, 6:22 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 22, 8:04 PM CDT	Severe Thunderstorm Warning	ABR	41 min
Jul 22, 8:21 PM CDT	Severe Thunderstorm Warning	ABR	24 min
Jul 22, 8:22 PM CDT	Mesoscale Discussion	SPC	83 min
Jul 24, 9:09 PM CDT	Special Weather Statement	UNR	21 min
Jul 24, 9:27 PM CDT	Severe Thunderstorm Warning	ABR	33 min
Aug 4, 3:42 PM CDT	Mesoscale Discussion	SPC	93 min
Aug 4, 10:00 PM CDT	Severe Thunderstorm Warning	ABR	45 min
Aug 4, 10:44 PM CDT	Severe Thunderstorm Warning	ABR	21 min
Aug 4, 11:14 PM CDT	Severe Thunderstorm Warning	ABR	31 min
Aug 6, 6:21 PM CDT	Special Weather Statement	ABR	39 min
Aug 6, 6:35 PM CDT	Special Weather Statement	ABR	25 min
Aug 6, 6:38 PM CDT	Severe Thunderstorm Warning	ABR	37 min
Aug 6, 6:51 PM CDT	Special Weather Statement	ABR	24 min
Aug 6, 7:06 PM CDT	Severe Thunderstorm Warning	ABR	39 min
Aug 6, 7:12 PM CDT	Special Weather Statement	ABR	18 min
Aug 23, 4:32 PM CDT	Mesoscale Discussion	SPC	118 min
Aug 23, 6:25 PM CDT	Severe Thunderstorm Watch	SPC	3 hr
Aug 23, 6:47 PM CDT	Mesoscale Discussion	SPC	88 min
Aug 23, 7:25 PM CDT	Severe Thunderstorm Warning	ABR	42 min
Aug 23, 8:29 PM CDT	Mesoscale Discussion	SPC	91 min
Aug 25, 8:55 PM CDT	Special Weather Statement	ABR	50 min
Aug 25, 10:20 PM CDT	Severe Thunderstorm Warning	ABR	25 min
Aug 27, 6:17 PM CDT	Mesoscale Discussion	SPC	88 min
Aug 27, 6:42 PM CDT	Severe Thunderstorm Watch	SPC	4 hr
Aug 27, 7:34 PM CDT	Special Weather Statement	ABR	41 min
Aug 27, 7:54 PM CDT	Severe Thunderstorm Warning	ABR	51 min
Sep 18, 2:10 AM CDT	Special Weather Statement	ABR	35 min
Sep 18, 2:53 AM CDT	Special Weather Statement	ABR	52 min
Sep 25, 9:57 AM CDT	Wind Advisory	ABR	9 hr
Oct 3, 3:24 AM CDT	Freeze Watch	ABR	11 hr
Oct 3, 3:24 AM CDT	Wind Advisory	ABR	18 hr
Oct 3, 2:51 PM CDT	Freeze Warning	ABR	18 hr
Oct 9, 4:51 AM CDT	Winter Weather Advisory	ABR	38 hr
Oct 18, 10:35 AM CDT	Wind Advisory	ABR	8 hr
Nov 15, 3:08 PM CST	Winter Weather Advisory	ABR	33 hr
Nov 27, 3:22 PM CST	Winter Weather Advisory	ABR	27 hr
Nov 29, 2:59 AM CST	Winter Storm Watch	ABR	25 hr
Nov 29, 8:25 PM CST	Dense Fog Advisory	ABR	16 hr
Nov 30, 3:33 AM CST	Winter Storm Warning	ABR	47 hr
Dec 25, 3:45 AM CST	Winter Storm Watch	ABR	11 hr
Dec 25, 2:28 PM CST	Winter Storm Warning	ABR	37 hr
Dec 26, 3:16 PM CST	Blizzard Warning	ABR	45 hr
Dec 30, 2:36 PM CST	Winter Weather Advisory	ABR	27 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	38
Severe Thunderstorm Watch	10
Tornado Watch	1
Mesoscale Discussion	27
Special Weather Statement	22
Flooding
Areal Flood Warning	1
Flash Flood Warning	1
River Flood Warning	1
Flash Flood Watch	1
Winter
Blizzard Warning	3
Winter Storm Warning	5
Winter Storm Watch	7
Winter Weather Advisory	12
Heat
Heat Advisory	4
Cold
Freeze Warning	1
Freeze Watch	1
Wind Chill Advisory	4
Wind and dust
High Wind Warning	1
Wind Advisory	6
Fog and smoke
Dense Fog Advisory	3

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2017 2019

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.