Alert archive / South Dakota / Gregory County

Weather alerts in Gregory County, South Dakota, 2022

159 weather alerts in 2022, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Gregory County and its neighbors

Each county as a circle sized by its count in 2022. Tap one for its archive.

Alerts: 159
Warnings: 56
Watches: 30
Advisories: 42
Busiest month: May34 alerts
Busiest day: May 12, 20228 alerts

Over time

By month

Warning verification

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

Gregory County, 2022

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	0			0
Severe thunderstorm warnings	23	15	35%	8	100%	16 min
Flash flood warnings	0			0

Each office's whole area, 2022

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Sioux Falls, SD: tornado warnings	34	8	76%	24	50%	8 min
NWS Sioux Falls, SD: severe thunderstorm warnings	306	208	32%	564	90%	20 min
NWS Sioux Falls, SD: flash flood warnings	6	5	17%	9	89%	112 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 4, 2:40 AM CST	Wind Advisory	FSD	33 hr
Jan 4, 2:44 AM CST	Wind Chill Advisory	FSD	36 hr
Jan 5, 4:00 AM CST	Wind Chill Advisory	FSD	54 hr
Jan 13, 2:50 PM CST	Winter Weather Advisory	FSD	36 hr
Jan 30, 2:06 PM CST	Fire Weather Watch	FSD	14 hr
Jan 31, 3:55 AM CST	Red Flag Warning	FSD	14 hr
Jan 31, 3:59 AM CST	Wind Advisory	FSD	31 hr
Feb 7, 4:16 PM CST	Wind Advisory	FSD	26 hr
Feb 7, 4:23 PM CST	Fire Weather Watch	FSD	11 hr
Feb 8, 3:09 AM CST	Red Flag Warning	FSD	15 hr
Feb 11, 3:12 AM CST	Wind Advisory	FSD	12 hr
Feb 17, 2:39 PM CST	Wind Advisory	FSD	28 hr
Feb 20, 3:22 PM CST	Winter Weather Advisory	FSD	54 hr
Feb 22, 9:55 AM CST	Wind Chill Advisory	FSD	24 hr
Mar 4, 4:32 AM CST	Winter Weather Advisory	FSD	43 hr
Mar 14, 2:27 PM CDT	Fire Weather Watch	FSD	13 hr
Mar 15, 3:41 AM CDT	Red Flag Warning	FSD	15 hr
Mar 18, 2:54 PM CDT	Fire Weather Watch	FSD	24 hr
Mar 19, 2:41 PM CDT	Red Flag Warning	FSD	30 hr
Mar 22, 4:24 AM CDT	Red Flag Warning	FSD	15 hr
Mar 24, 3:53 AM CDT	Fire Weather Watch	FSD	11 hr
Mar 24, 2:46 PM CDT	Red Flag Warning	FSD	30 hr
Apr 3, 2:37 AM CDT	Wind Advisory	FSD	16 hr
Apr 4, 3:20 AM CDT	Red Flag Warning	FSD	18 hr
Apr 4, 3:15 PM CDT	Red Flag Warning	FSD	30 hr
Apr 5, 2:49 AM CDT	High Wind Watch	FSD	13 hr
Apr 5, 2:49 AM CDT	Wind Advisory	FSD	16 hr
Apr 5, 3:32 PM CDT	High Wind Watch	FSD	13 hr
Apr 5, 3:32 PM CDT	High Wind Warning	FSD	51 hr
Apr 5, 3:32 PM CDT	Wind Advisory	FSD	54 hr
Apr 8, 3:25 AM CDT	Red Flag Warning	FSD	17 hr
Apr 9, 11:22 AM CDT	Red Flag Warning	FSD	8 hr
Apr 11, 3:53 AM CDT	Red Flag Warning	FSD	16 hr
Apr 12, 4:29 AM CDT	Wind Advisory	FSD	23 hr
Apr 13, 4:53 AM CDT	Wind Advisory	FSD	38 hr
Apr 19, 3:10 AM CDT	Wind Advisory	FSD	16 hr
Apr 22, 3:28 AM CDT	Wind Advisory	FSD	24 hr
Apr 22, 3:28 AM CDT	Wind Advisory	FSD	64 hr
Apr 22, 5:08 PM CDT	Mesoscale Discussion	SPC	97 min
Apr 22, 5:34 PM CDT	Severe Thunderstorm Watch	SPC	5 hr
Apr 22, 10:02 PM CDT	High Wind Warning	FSD	7 hr
Apr 29, 4:16 AM CDT	High Wind Warning	FSD	42 hr
May 7, 3:55 PM CDT	Mesoscale Discussion	SPC	95 min
May 7, 5:22 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
May 7, 7:19 PM CDT	Severe Thunderstorm Warning	FSD	41 min
May 7, 7:24 PM CDT	Mesoscale Discussion	SPC	96 min
May 8, 3:52 PM CDT	Wind Advisory	FSD	28 hr
May 8, 10:45 PM CDT	Mesoscale Discussion	SPC	90 min
May 8, 11:48 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
May 9, 1:32 AM CDT	Mesoscale Discussion	SPC	118 min
May 9, 3:25 AM CDT	Severe Thunderstorm Warning Considerable damage threat	FSD	50 min
May 9, 3:46 AM CDT	Mesoscale Discussion	SPC	89 min
May 9, 4:12 AM CDT	Severe Thunderstorm Warning	FSD	33 min
May 9, 4:16 AM CDT	Severe Thunderstorm Warning	FSD	44 min
May 11, 11:50 PM CDT	Mesoscale Discussion	SPC	115 min
May 12, 2:47 PM CDT	Mesoscale Discussion	SPC	2 hr
May 12, 3:16 PM CDT	Severe Thunderstorm Warning	FSD	44 min
May 12, 3:21 PM CDT	Severe Thunderstorm Warning Considerable damage threat	FSD	24 min
May 12, 3:27 PM CDT	Severe Thunderstorm Watch PDS	SPC	7 hr
May 12, 3:40 PM CDT	Severe Thunderstorm Warning Considerable damage threat	FSD	50 min
May 12, 3:46 PM CDT	Severe Thunderstorm Warning Considerable damage threat	FSD	44 min
May 12, 3:59 PM CDT	Severe Thunderstorm Warning Considerable damage threat	FSD	46 min
May 21, 2:47 PM CDT	Frost Advisory	FSD	18 hr
May 28, 7:51 PM CDT	Mesoscale Discussion	SPC	54 min
May 28, 9:52 PM CDT	Severe Thunderstorm Watch	SPC	5 hr
May 28, 11:21 PM CDT	Mesoscale Discussion	SPC	84 min
May 29, 1:22 AM CDT	Severe Thunderstorm Warning	FSD	53 min
May 29, 1:41 AM CDT	Mesoscale Discussion	SPC	94 min
May 29, 7:16 PM CDT	Tornado Watch	SPC	8 hr
May 29, 9:16 PM CDT	Mesoscale Discussion	SPC	89 min
May 29, 11:16 PM CDT	Severe Thunderstorm Warning	FSD	44 min
May 29, 11:25 PM CDT	Mesoscale Discussion	SPC	95 min
May 29, 11:52 PM CDT	Severe Thunderstorm Warning	FSD	38 min
May 30, 2:40 AM CDT	High Wind Warning	FSD	104 min
May 30, 4:24 AM CDT	Wind Advisory	FSD	19 hr
May 30, 9:27 AM CDT	Mesoscale Discussion	SPC	93 min
Jun 12, 12:44 AM CDT	Mesoscale Discussion	SPC	2 hr
Jun 12, 2:50 PM CDT	Heat Advisory	FSD	30 hr
Jun 12, 8:07 PM CDT	Mesoscale Discussion	SPC	83 min
Jun 12, 8:41 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 12, 11:27 PM CDT	Mesoscale Discussion	SPC	2 hr
Jun 12, 11:40 PM CDT	Severe Thunderstorm Warning	FSD	65 min
Jun 13, 12:23 AM CDT	Severe Thunderstorm Warning Considerable damage threat	FSD	67 min
Jun 16, 2:40 PM CDT	Excessive Heat Watch	FSD	37 hr
Jun 17, 3:00 PM CDT	Heat Advisory	FSD	3 days
Jun 20, 3:36 PM CDT	Severe Thunderstorm Watch	SPC	8 hr
Jun 23, 7:15 PM CDT	Mesoscale Discussion	SPC	3 hr
Jun 24, 2:45 PM CDT	Mesoscale Discussion	SPC	90 min
Jun 24, 5:36 PM CDT	Mesoscale Discussion	SPC	84 min
Jun 24, 7:17 PM CDT	Severe Thunderstorm Watch	SPC	8 hr
Jun 24, 8:47 PM CDT	Mesoscale Discussion	SPC	118 min
Jun 25, 1:08 AM CDT	Severe Thunderstorm Warning	FSD	37 min
Jun 25, 1:33 AM CDT	Severe Thunderstorm Warning	FSD	27 min
Jun 28, 2:57 PM CDT	Fire Weather Watch	FSD	12 hr
Jun 28, 3:00 PM CDT	Wind Advisory	FSD	29 hr
Jun 29, 3:26 AM CDT	Red Flag Warning	FSD	17 hr
Jun 29, 6:11 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 29, 7:18 PM CDT	Severe Thunderstorm Warning	FSD	42 min
Jun 29, 7:57 PM CDT	Severe Thunderstorm Warning	FSD	48 min
Jul 3, 2:17 PM CDT	Heat Advisory	FSD	51 hr
Jul 3, 5:59 PM CDT	Mesoscale Discussion	SPC	2 hr
Jul 3, 10:48 PM CDT	Mesoscale Discussion	SPC	57 min
Jul 4, 12:35 AM CDT	Mesoscale Discussion	SPC	55 min
Jul 4, 12:53 AM CDT	Severe Thunderstorm Watch	SPC	5 hr
Jul 4, 2:03 AM CDT	Severe Thunderstorm Warning	FSD	42 min
Jul 4, 5:20 AM CDT	Mesoscale Discussion	SPC	55 min
Jul 5, 1:42 AM CDT	Severe Thunderstorm Warning	FSD	33 min
Jul 5, 9:37 AM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jul 5, 1:15 PM CDT	Severe Thunderstorm Warning Considerable damage threat	FSD	45 min
Jul 5, 1:54 PM CDT	Severe Thunderstorm Warning Considerable damage threat	FSD	66 min
Jul 9, 3:16 AM CDT	Heat Advisory	FSD	41 hr
Jul 11, 12:37 AM CDT	Mesoscale Discussion	SPC	83 min
Jul 14, 3:23 AM CDT	Heat Advisory	FSD	17 hr
Jul 16, 11:15 AM CDT	Special Weather Statement	LBF	60 min
Jul 17, 3:19 PM CDT	Heat Advisory	FSD	29 hr
Aug 1, 3:04 AM CDT	Heat Advisory	FSD	41 hr
Aug 2, 6:19 PM CDT	Severe Thunderstorm Warning	FSD	41 min
Aug 4, 2:43 PM CDT	Heat Advisory	FSD	29 hr
Aug 5, 3:27 AM CDT	Excessive Heat Warning	FSD	17 hr
Aug 5, 5:20 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Sep 7, 3:31 AM CDT	Fire Weather Watch	FSD	28 hr
Sep 8, 3:11 AM CDT	Red Flag Warning	FSD	17 hr
Sep 16, 6:55 PM CDT	Mesoscale Discussion	SPC	4 hr
Sep 25, 2:46 AM CDT	Red Flag Warning	FSD	16 hr
Oct 5, 2:46 PM CDT	Freeze Watch	FSD	24 hr
Oct 6, 3:21 AM CDT	Freeze Warning	FSD	31 hr
Oct 7, 11:38 AM CDT	Freeze Warning	FSD	21 hr
Oct 10, 3:00 PM CDT	Fire Weather Watch	FSD	20 hr
Oct 11, 3:29 AM CDT	Fire Weather Watch	FSD	12 hr
Oct 11, 11:08 AM CDT	Red Flag Warning	FSD	7 hr
Oct 11, 3:09 PM CDT	Wind Advisory	FSD	28 hr
Oct 11, 3:19 PM CDT	Red Flag Warning	FSD	28 hr
Oct 12, 11:01 AM CDT	Fire Weather Watch	FSD	4 hr
Oct 12, 3:08 PM CDT	Red Flag Warning	FSD	28 hr
Oct 13, 2:45 AM CDT	Wind Advisory	FSD	16 hr
Oct 13, 2:16 PM CDT	High Wind Warning	FSD	5 hr
Oct 22, 2:42 PM CDT	Red Flag Warning	FSD	29 hr
Nov 1, 3:38 AM CDT	Red Flag Warning	FSD	15 hr
Nov 5, 2:36 PM CDT	Red Flag Warning	FSD	28 hr
Nov 6, 2:14 PM CST	Red Flag Warning	FSD	26 hr
Nov 9, 3:37 AM CST	Winter Weather Advisory	FSD	32 hr
Nov 9, 8:19 AM CST	Winter Weather Advisory	FSD	4 hr
Dec 1, 2:42 PM CST	Wind Advisory	FSD	33 hr
Dec 7, 2:49 PM CST	Winter Weather Advisory	FSD	39 hr
Dec 10, 2:45 PM CST	Winter Storm Watch	FSD	48 hr
Dec 12, 3:20 AM CST	Winter Weather Advisory	FSD	49 hr
Dec 13, 3:21 AM CST	Winter Weather Advisory	FSD	4 days
Dec 13, 12:02 PM CST	Winter Storm Warning	FSD	3 days
Dec 14, 11:45 AM CST	Blizzard Warning	FSD	51 hr
Dec 19, 2:49 AM CST	Wind Chill Watch	FSD	24 hr
Dec 19, 2:49 AM CST	Wind Chill Advisory	FSD	31 hr
Dec 19, 2:15 PM CST	Winter Storm Watch	FSD	48 hr
Dec 20, 2:53 AM CST	Wind Chill Warning	FSD	4 days
Dec 20, 2:53 PM CST	Winter Weather Advisory	FSD	45 hr
Dec 21, 1:57 PM CST	Blizzard Warning	FSD	64 hr
Dec 21, 7:01 PM CST	Mesoscale Discussion	SPC	4 hr
Dec 22, 9:23 AM CST	Mesoscale Discussion	SPC	4 hr
Dec 22, 1:55 PM CST	Mesoscale Discussion	SPC	4 hr
Dec 25, 3:07 AM CST	Winter Weather Advisory	FSD	24 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	23
Severe Thunderstorm Watch	12
Tornado Watch	1
Mesoscale Discussion	30
Special Weather Statement	1
Winter
Blizzard Warning	2
Winter Storm Warning	1
Winter Storm Watch	2
Winter Weather Advisory	10
Heat
Excessive Heat Warning	1
Excessive Heat Watch	1
Heat Advisory	8
Cold
Freeze Warning	2
Wind Chill Warning	1
Freeze Watch	1
Wind Chill Watch	1
Frost Advisory	1
Wind Chill Advisory	4
Wind and dust
High Wind Warning	5
High Wind Watch	2
Wind Advisory	19
Fire
Red Flag Warning	21
Fire Weather Watch	10

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2021 2023

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.