Alert archive / South Dakota / Mellette County

Weather alerts in Mellette County, South Dakota, 2019

151 weather alerts in 2019, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Mellette County and its neighbors

Each county as a circle sized by its count in 2019. Tap one for its archive.

Alerts: 151
Warnings: 47
Watches: 28
Advisories: 31
Busiest month: July34 alerts
Busiest day: August 9, 20197 alerts

Over time

By month

Warning verification

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

Mellette County, 2019

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	0			0
Severe thunderstorm warnings	32	23	28%	13	100%	29 min
Flash flood warnings	0			0

Each office's whole area, 2019

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Rapid City, SD: tornado warnings	24	7	71%	13	77%	11 min
NWS Rapid City, SD: severe thunderstorm warnings	444	289	35%	588	87%	24 min
NWS Rapid City, SD: flash flood warnings	24	12	50%	28	86%	94 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 17, 3:22 AM CST	Winter Weather Advisory	UNR	34 hr
Jan 20, 2:40 PM CST	Winter Weather Advisory	UNR	38 hr
Jan 25, 4:12 AM CST	High Wind Watch	UNR	47 hr
Jan 27, 3:41 AM CST	High Wind Warning	UNR	32 hr
Jan 28, 3:21 AM CST	Wind Chill Advisory	UNR	57 hr
Jan 28, 3:21 AM CST	Wind Advisory	UNR	9 hr
Jan 29, 4:03 PM CST	Wind Chill Warning	UNR	12 hr
Feb 5, 3:23 PM CST	Wind Chill Advisory	UNR	4 days
Feb 5, 3:23 PM CST	Winter Weather Advisory	UNR	35 hr
Feb 14, 3:14 PM CST	Winter Weather Advisory	UNR	24 hr
Feb 15, 2:47 PM CST	Winter Storm Watch	UNR	13 hr
Feb 15, 2:47 PM CST	Winter Weather Advisory	UNR	51 hr
Feb 22, 3:58 AM CST	Winter Weather Advisory	UNR	20 hr
Mar 2, 4:14 AM CST	Wind Chill Warning	UNR	56 hr
Mar 2, 4:14 AM CST	Wind Chill Advisory	UNR	35 hr
Mar 4, 4:48 AM CST	Wind Chill Advisory	UNR	7 hr
Mar 5, 3:10 PM CST	Winter Storm Watch	UNR	12 hr
Mar 6, 3:13 AM CST	Winter Storm Warning	UNR	27 hr
Mar 6, 3:13 AM CST	Winter Weather Advisory	UNR	31 hr
Mar 7, 8:10 AM CST	Winter Storm Watch	UNR	20 hr
Mar 8, 4:19 AM CST	Winter Weather Advisory	UNR	41 hr
Mar 8, 11:43 PM CST	Mesoscale Discussion	SPC	5 hr
Mar 11, 3:48 AM CDT	Winter Storm Watch	UNR	36 hr
Mar 12, 4:09 AM CDT	Blizzard Warning	UNR	63 hr
Mar 12, 9:58 PM CDT	Areal Flood Advisory	UNR	7 hr
Mar 13, 4:59 AM CDT	Mesoscale Discussion	SPC	4 hr
Mar 13, 6:26 PM CDT	Mesoscale Discussion	SPC	6 hr
Mar 19, 3:44 PM CDT	River Flood Warning	UNR	21 days
Mar 23, 2:48 PM CDT	Areal Flood Advisory	UNR	72 hr
Mar 24, 3:53 AM CDT	Dense Fog Advisory	UNR	33 hr
Mar 24, 2:50 PM CDT	Areal Flood Warning	UNR	72 hr
Mar 26, 1:34 AM CDT	Dense Fog Advisory	UNR	9 hr
Mar 27, 11:51 AM CDT	Areal Flood Warning	UNR	25 hr
Apr 6, 3:40 AM CDT	Dense Fog Advisory	UNR	7 hr
Apr 7, 4:01 PM CDT	Winter Storm Watch	UNR	36 hr
Apr 9, 4:08 AM CDT	Blizzard Warning	UNR	64 hr
Apr 11, 2:34 AM CDT	Mesoscale Discussion	SPC	6 hr
Apr 11, 6:52 PM CDT	Winter Weather Advisory	UNR	12 hr
May 17, 4:38 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
May 17, 6:23 PM CDT	Severe Thunderstorm Warning	UNR	22 min
May 17, 7:53 PM CDT	Mesoscale Discussion	SPC	2 hr
May 19, 3:47 PM CDT	Flood Watch	UNR	72 hr
May 21, 4:04 PM CDT	River Flood Warning	UNR	4 days
May 21, 6:12 PM CDT	Areal Flood Warning	UNR	68 hr
May 25, 3:54 AM CDT	Flood Watch	UNR	4 days
May 27, 11:38 AM CDT	River Flood Warning	UNR	21 days
Jun 2, 4:59 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 2, 5:06 PM CDT	Severe Thunderstorm Warning	UNR	39 min
Jun 2, 5:43 PM CDT	Severe Thunderstorm Warning	UNR	32 min
Jun 2, 6:07 PM CDT	Severe Thunderstorm Warning	UNR	28 min
Jun 2, 6:46 PM CDT	Mesoscale Discussion	SPC	89 min
Jun 11, 6:00 PM CDT	Special Weather Statement	UNR	30 min
Jun 14, 5:23 PM CDT	Special Weather Statement	UNR	37 min
Jun 14, 6:21 PM CDT	Special Weather Statement	UNR	39 min
Jun 14, 6:49 PM CDT	Special Weather Statement	UNR	41 min
Jun 19, 9:02 PM CDT	Mesoscale Discussion	SPC	118 min
Jun 27, 12:00 AM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 27, 1:31 AM CDT	Severe Thunderstorm Warning	UNR	29 min
Jun 27, 3:16 PM CDT	Heat Advisory	UNR	29 hr
Jun 28, 3:28 PM CDT	Heat Advisory	UNR	30 hr
Jun 30, 12:23 PM CDT	Mesoscale Discussion	SPC	97 min
Jun 30, 5:19 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 30, 6:14 PM CDT	Severe Thunderstorm Warning	UNR	76 min
Jun 30, 6:54 PM CDT	Severe Thunderstorm Warning	UNR	50 min
Jun 30, 7:02 PM CDT	Severe Thunderstorm Warning	UNR	28 min
Jun 30, 7:26 PM CDT	Severe Thunderstorm Warning	UNR	79 min
Jun 30, 8:34 PM CDT	Areal Flood Advisory	UNR	12 hr
Jun 30, 9:04 PM CDT	Special Weather Statement	UNR	41 min
Jul 3, 12:29 AM CDT	Severe Thunderstorm Warning	UNR	31 min
Jul 3, 2:29 PM CDT	Severe Thunderstorm Watch	SPC	9 hr
Jul 3, 5:10 PM CDT	Mesoscale Discussion	SPC	2 hr
Jul 3, 7:13 PM CDT	Severe Thunderstorm Warning	UNR	32 min
Jul 3, 7:22 PM CDT	Severe Thunderstorm Warning	UNR	53 min
Jul 3, 8:10 PM CDT	Severe Thunderstorm Warning	UNR	65 min
Jul 3, 8:53 PM CDT	Severe Thunderstorm Warning	UNR	67 min
Jul 3, 10:13 PM CDT	Mesoscale Discussion	SPC	92 min
Jul 4, 11:32 PM CDT	Severe Thunderstorm Watch	SPC	4 hr
Jul 4, 11:58 PM CDT	Severe Thunderstorm Warning	UNR	49 min
Jul 5, 1:43 AM CDT	Mesoscale Discussion	SPC	2 hr
Jul 5, 6:19 PM CDT	Mesoscale Discussion	SPC	116 min
Jul 9, 2:31 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jul 9, 5:42 PM CDT	Mesoscale Discussion	SPC	2 hr
Jul 9, 5:46 PM CDT	Special Weather Statement	UNR	29 min
Jul 14, 2:54 AM CDT	Heat Advisory	UNR	16 hr
Jul 14, 2:49 PM CDT	Mesoscale Discussion	SPC	2 hr
Jul 14, 5:32 PM CDT	Severe Thunderstorm Warning	UNR	58 min
Jul 14, 6:55 PM CDT	Severe Thunderstorm Warning	UNR	23 min
Jul 15, 6:42 PM CDT	Mesoscale Discussion	SPC	93 min
Jul 16, 3:50 PM CDT	Severe Thunderstorm Watch	SPC	9 hr
Jul 16, 10:03 PM CDT	Severe Thunderstorm Warning	UNR	57 min
Jul 16, 10:08 PM CDT	Mesoscale Discussion	SPC	97 min
Jul 16, 11:02 PM CDT	Special Weather Statement	UNR	58 min
Jul 16, 11:34 PM CDT	Mesoscale Discussion	SPC	86 min
Jul 17, 2:16 AM CDT	Areal Flood Warning	UNR	3 hr
Jul 18, 2:21 AM CDT	Special Weather Statement	UNR	39 min
Jul 19, 10:33 PM CDT	Mesoscale Discussion	SPC	87 min
Jul 26, 7:47 AM CDT	Severe Thunderstorm Warning	UNR	28 min
Jul 26, 8:54 AM CDT	Severe Thunderstorm Warning	UNR	23 min
Aug 4, 4:24 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Aug 4, 5:15 PM CDT	Severe Thunderstorm Warning	UNR	75 min
Aug 9, 1:47 PM CDT	Mesoscale Discussion	SPC	88 min
Aug 9, 2:09 PM CDT	Tornado Watch	SPC	7 hr
Aug 9, 3:06 PM CDT	Severe Thunderstorm Warning	UNR	54 min
Aug 9, 3:43 PM CDT	Mesoscale Discussion	SPC	92 min
Aug 9, 3:59 PM CDT	Severe Thunderstorm Warning	UNR	61 min
Aug 9, 4:55 PM CDT	Severe Thunderstorm Warning	UNR	65 min
Aug 9, 6:03 PM CDT	Mesoscale Discussion	SPC	57 min
Aug 11, 2:59 PM CDT	Tornado Watch	SPC	10 hr
Aug 11, 9:45 PM CDT	Mesoscale Discussion	SPC	60 min
Aug 17, 12:31 PM CDT	Mesoscale Discussion	SPC	119 min
Aug 17, 2:19 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Aug 17, 5:21 PM CDT	Severe Thunderstorm Warning	UNR	54 min
Aug 17, 5:55 PM CDT	Severe Thunderstorm Warning	UNR	17 min
Aug 17, 5:59 PM CDT	Severe Thunderstorm Warning	UNR	61 min
Aug 25, 2:50 PM CDT	Mesoscale Discussion	SPC	115 min
Aug 25, 3:18 PM CDT	Severe Thunderstorm Watch	SPC	9 hr
Aug 25, 5:58 PM CDT	Mesoscale Discussion	SPC	2 hr
Aug 25, 7:33 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Aug 25, 9:49 PM CDT	Mesoscale Discussion	SPC	116 min
Aug 25, 11:52 PM CDT	Special Weather Statement	UNR	23 min
Aug 26, 12:04 AM CDT	Severe Thunderstorm Warning	UNR	56 min
Aug 26, 1:05 AM CDT	Mesoscale Discussion	SPC	55 min
Sep 1, 11:56 PM CDT	Mesoscale Discussion	SPC	64 min
Sep 2, 2:41 AM CDT	Severe Thunderstorm Warning	UNR	64 min
Sep 2, 3:19 AM CDT	Special Weather Statement	UNR	41 min
Sep 2, 3:36 AM CDT	Severe Thunderstorm Warning	UNR	54 min
Sep 10, 2:25 PM CDT	Mesoscale Discussion	SPC	2 hr
Sep 10, 2:53 PM CDT	Tornado Watch	SPC	7 hr
Sep 10, 4:41 PM CDT	Severe Thunderstorm Warning	UNR	49 min
Sep 11, 8:03 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Sep 20, 5:02 PM CDT	Severe Thunderstorm Watch	SPC	9 hr
Sep 20, 7:53 PM CDT	Mesoscale Discussion	SPC	2 hr
Sep 20, 9:25 PM CDT	Severe Thunderstorm Warning	UNR	65 min
Sep 20, 10:20 PM CDT	Mesoscale Discussion	SPC	115 min
Sep 21, 12:06 AM CDT	Special Weather Statement	UNR	54 min
Sep 21, 1:22 AM CDT	Mesoscale Discussion	SPC	83 min
Oct 4, 3:26 PM CDT	Wind Advisory	UNR	26 hr
Oct 4, 10:43 PM CDT	Special Weather Statement	UNR	32 min
Oct 7, 4:03 PM CDT	Winter Storm Watch	UNR	44 hr
Oct 9, 12:27 PM CDT	Winter Weather Advisory	UNR	50 hr
Oct 21, 3:00 AM CDT	Wind Advisory	UNR	15 hr
Nov 18, 2:28 AM CST	Wind Advisory	UNR	14 hr
Nov 24, 2:52 PM CST	Winter Weather Advisory	UNR	48 hr
Nov 26, 2:26 PM CST	Winter Storm Watch	UNR	61 hr
Nov 28, 3:17 AM CST	Blizzard Warning	UNR	70 hr
Nov 30, 2:48 AM CST	Mesoscale Discussion	SPC	6 hr
Nov 30, 8:17 PM CST	Winter Weather Advisory	UNR	13 hr
Dec 24, 6:24 PM CST	Dense Fog Advisory	UNR	23 hr
Dec 26, 3:34 PM CST	Winter Storm Watch	UNR	23 hr
Dec 27, 3:03 PM CST	Winter Storm Warning	UNR	63 hr
Dec 30, 3:23 AM CST	Winter Weather Advisory	UNR	12 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	32
Severe Thunderstorm Watch	14
Tornado Watch	3
Mesoscale Discussion	33
Special Weather Statement	12
Flooding
Areal Flood Warning	4
River Flood Warning	3
Flood Watch	2
Areal Flood Advisory	3
Winter
Blizzard Warning	3
Winter Storm Warning	2
Winter Storm Watch	8
Winter Weather Advisory	13
Heat
Heat Advisory	3
Cold
Wind Chill Warning	2
Wind Chill Advisory	4
Wind and dust
High Wind Warning	1
High Wind Watch	1
Wind Advisory	4
Fog and smoke
Dense Fog Advisory	4

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2018 2020

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.