Weather alerts in Rock County, Minnesota, 2022

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

Rock County and its neighbors

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

Alerts: 135
Warnings: 53
Watches: 15
Advisories: 45
Busiest month: May42 alerts
Busiest day: May 30, 202221 alerts

Over time

By month

Warning verification

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

3 of 5 tornado warnings covering Rock County in 2022 had a tornado report inside them; 1 of 1 tornado reports fell inside a warning, on average 1 minutes after it went out.

Rock County, 2022

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	5	3	40%	1	100%	1 min
Severe thunderstorm warnings	32	28	13%	19	100%	27 min
Flash flood warnings	2	2	0%	1	100%	35 min

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, 2:44 AM CST	Wind Chill Advisory	FSD	36 hr
Jan 4, 2:44 AM CST	Winter Weather Advisory	FSD	36 hr
Jan 5, 4:00 AM CST	Wind Chill Advisory	FSD	54 hr
Jan 7, 2:45 PM CST	Wind Advisory	FSD	15 hr
Jan 12, 3:27 AM CST	Winter Storm Watch	FSD	35 hr
Jan 13, 3:10 AM CST	Winter Storm Warning	FSD	48 hr
Jan 14, 2:14 AM CST	Mesoscale Discussion	SPC	4 hr
Jan 14, 8:51 AM CST	Mesoscale Discussion	SPC	3 hr
Jan 14, 2:35 PM CST	Mesoscale Discussion	SPC	4 hr
Jan 18, 3:04 AM CST	Wind Chill Advisory	FSD	34 hr
Jan 19, 3:05 AM CST	Wind Chill Advisory	FSD	33 hr
Jan 24, 3:01 AM CST	Wind Chill Advisory	FSD	54 hr
Jan 31, 3:59 AM CST	Wind Advisory	FSD	31 hr
Feb 1, 2:11 PM CST	Wind Chill Advisory	FSD	22 hr
Feb 2, 3:17 AM CST	Wind Chill Advisory	FSD	33 hr
Feb 11, 3:12 AM CST	Wind Advisory	FSD	12 hr
Feb 11, 3:08 PM CST	Wind Chill Advisory	FSD	18 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 15, 2:25 AM CDT	Dense Fog Advisory	FSD	10 hr
Mar 24, 2:48 PM CDT	Wind Advisory	FSD	28 hr
Apr 5, 3:32 PM CDT	Wind Advisory	FSD	54 hr
Apr 12, 2:48 PM CDT	Mesoscale Discussion	SPC	87 min
Apr 12, 5:51 PM CDT	Severe Thunderstorm Warning	FSD	39 min
Apr 12, 5:54 PM CDT	Severe Thunderstorm Warning	FSD	33 min
Apr 12, 6:00 PM CDT	Severe Thunderstorm Watch	SPC	5 hr
Apr 12, 6:40 PM CDT	Severe Thunderstorm Warning	FSD	35 min
Apr 13, 4:53 AM CDT	Wind Advisory	FSD	38 hr
Apr 14, 3:01 AM CDT	High Wind Warning	FSD	16 hr
Apr 18, 3:27 AM CDT	Red Flag Warning	FSD	17 hr
Apr 20, 9:53 PM CDT	Dense Fog Advisory	FSD	11 hr
Apr 22, 3:28 AM CDT	Wind Advisory	FSD	64 hr
Apr 23, 3:27 AM CDT	Red Flag Warning	FSD	17 hr
Apr 23, 5:04 AM CDT	Severe Thunderstorm Warning	FSD	26 min
Apr 23, 5:29 AM CDT	Severe Thunderstorm Warning	FSD	46 min
Apr 23, 10:31 AM CDT	High Wind Warning	FSD	8 hr
Apr 23, 12:03 PM CDT	Mesoscale Discussion	SPC	87 min
May 11, 7:44 AM CDT	Mesoscale Discussion	SPC	91 min
May 11, 12:50 PM CDT	Mesoscale Discussion	SPC	2 hr
May 11, 1:15 PM CDT	Tornado Watch	SPC	8 hr
May 11, 3:52 PM CDT	Mesoscale Discussion	SPC	113 min
May 12, 12:09 AM CDT	Dense Fog Advisory	FSD	4 hr
May 12, 3:27 PM CDT	Severe Thunderstorm Watch PDS	SPC	7 hr
May 12, 4:32 PM CDT	Mesoscale Discussion	SPC	58 min
May 12, 4:40 PM CDT	Severe Thunderstorm Warning Destructive damage threat	FSD	50 min
May 12, 4:53 PM CDT	Severe Thunderstorm Warning Destructive damage threat	FSD	37 min
May 12, 5:13 PM CDT	Severe Thunderstorm Warning Destructive damage threat	FSD	47 min
May 12, 5:22 PM CDT	Severe Thunderstorm Warning Considerable damage threat	FSD	38 min
May 12, 5:37 PM CDT	Severe Thunderstorm Warning Considerable damage threat	FSD	23 min
May 12, 5:42 PM CDT	Severe Thunderstorm Warning Destructive damage threat	FSD	33 min
May 12, 7:46 PM CDT	Severe Thunderstorm Warning Considerable damage threat	FSD	44 min
May 12, 8:13 PM CDT	Severe Thunderstorm Warning Considerable damage threat	FSD	47 min
May 21, 2:47 PM CDT	Frost Advisory	FSD	18 hr
May 29, 3:02 AM CDT	Severe Thunderstorm Watch	SPC	5 hr
May 29, 4:04 AM CDT	Severe Thunderstorm Warning Considerable damage threat	FSD	41 min
May 29, 4:16 AM CDT	Mesoscale Discussion	SPC	89 min
May 29, 4:26 AM CDT	Severe Thunderstorm Warning	FSD	38 min
May 29, 4:41 AM CDT	Severe Thunderstorm Warning Considerable damage threat	FSD	49 min
May 29, 11:25 PM CDT	Mesoscale Discussion	SPC	95 min
May 30, 12:03 AM CDT	Severe Thunderstorm Watch	SPC	8 hr
May 30, 1:58 AM CDT	Severe Thunderstorm Warning Considerable damage threat	FSD	47 min
May 30, 2:05 AM CDT	Tornado Warning	FSD	25 min
May 30, 2:18 AM CDT	Tornado Warning	FSD	27 min
May 30, 2:20 AM CDT	Tornado Warning	FSD	40 min
May 30, 2:21 AM CDT	Mesoscale Discussion	SPC	84 min
May 30, 2:24 AM CDT	Tornado Warning	FSD	36 min
May 30, 2:40 AM CDT	Severe Thunderstorm Warning Considerable damage threat	FSD	65 min
May 30, 4:24 AM CDT	Wind Advisory	FSD	19 hr
May 30, 9:27 AM CDT	Mesoscale Discussion	SPC	93 min
May 30, 11:28 AM CDT	Mesoscale Discussion	SPC	92 min
May 30, 11:49 AM CDT	Tornado Watch	SPC	6 hr
May 30, 1:34 PM CDT	Mesoscale Discussion	SPC	86 min
May 30, 3:06 PM CDT	Severe Thunderstorm Warning Considerable damage threat	FSD	24 min
May 30, 3:14 PM CDT	Tornado Warning	FSD	31 min
May 30, 3:27 PM CDT	Severe Thunderstorm Warning Considerable damage threat	FSD	48 min
May 30, 6:41 PM CDT	Severe Thunderstorm Warning	FSD	49 min
May 30, 6:45 PM CDT	Severe Thunderstorm Warning	FSD	45 min
May 30, 6:46 PM CDT	Severe Thunderstorm Warning	FSD	29 min
May 30, 6:51 PM CDT	Mesoscale Discussion	SPC	54 min
Jun 12, 2:50 PM CDT	Heat Advisory	FSD	30 hr
Jun 13, 1:30 AM CDT	Mesoscale Discussion	SPC	2 hr
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, 8:07 PM CDT	Severe Thunderstorm Warning Considerable damage threat	FSD	23 min
Jun 20, 8:26 PM CDT	Severe Thunderstorm Warning Destructive damage threat	FSD	34 min
Jun 20, 8:30 PM CDT	Severe Thunderstorm Warning Considerable damage threat	FSD	30 min
Jun 20, 8:37 PM CDT	Severe Thunderstorm Warning Considerable damage threat	FSD	53 min
Jun 28, 3:00 PM CDT	Wind Advisory	FSD	29 hr
Jul 5, 1:37 PM CDT	Severe Thunderstorm Watch	SPC	5 hr
Jul 5, 2:44 PM CDT	Mesoscale Discussion	SPC	2 hr
Jul 5, 3:19 PM CDT	Severe Thunderstorm Warning Considerable damage threat	FSD	56 min
Jul 5, 4:10 PM CDT	Severe Thunderstorm Warning Considerable damage threat	FSD	65 min
Jul 5, 4:55 PM CDT	Flash Flood Warning	FSD	3 hr
Jul 5, 5:12 PM CDT	Severe Thunderstorm Warning Considerable damage threat	FSD	63 min
Aug 1, 3:04 AM CDT	Heat Advisory	FSD	41 hr
Aug 2, 9:13 PM CDT	Severe Thunderstorm Warning	FSD	47 min
Aug 2, 9:19 PM CDT	Mesoscale Discussion	SPC	56 min
Aug 7, 3:07 AM CDT	Flash Flood Warning	FSD	7 hr
Aug 21, 4:34 AM CDT	Dense Fog Advisory	FSD	5 hr
Sep 27, 2:31 PM CDT	Frost Advisory	FSD	17 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 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 17, 2:14 PM CDT	Red Flag Warning	FSD	5 hr
Oct 23, 3:28 AM CDT	Wind Advisory	FSD	23 hr
Oct 23, 6:12 PM CDT	Severe Thunderstorm Watch	SPC	3 hr
Oct 23, 7:24 PM CDT	Mesoscale Discussion	SPC	66 min
Oct 23, 7:47 PM CDT	Severe Thunderstorm Warning	FSD	43 min
Nov 5, 2:30 PM CDT	Wind Advisory	FSD	29 hr
Nov 5, 2:36 PM CDT	Red Flag Warning	FSD	28 hr
Nov 28, 3:29 AM CST	Winter Weather Advisory	FSD	37 hr
Dec 1, 3:04 AM CST	Wind Advisory	FSD	13 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 8, 11:36 PM CST	Mesoscale Discussion	SPC	4 hr
Dec 10, 2:45 PM CST	Winter Storm Watch	FSD	48 hr
Dec 11, 12:13 AM CST	Dense Fog Advisory	FSD	9 hr
Dec 12, 2:56 PM CST	Ice Storm Warning	FSD	21 hr
Dec 13, 3:21 AM CST	Winter Weather Advisory	FSD	4 days
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, 10:33 AM CST	Mesoscale Discussion	SPC	4 hr
Dec 21, 1:57 PM CST	Blizzard Warning	FSD	64 hr
Dec 24, 2:36 PM CST	Wind Chill Advisory	FSD	17 hr
Dec 25, 3:07 AM CST	Winter Weather Advisory	FSD	24 hr
Dec 28, 2:21 PM CST	Winter Weather Advisory	FSD	31 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
Tornado Warning	5
Severe Thunderstorm Watch	6
Tornado Watch	2
Mesoscale Discussion	22
Flooding
Flash Flood Warning	2
Winter
Blizzard Warning	1
Ice Storm Warning	1
Winter Storm Warning	1
Winter Storm Watch	3
Winter Weather Advisory	9
Heat
Excessive Heat Watch	1
Heat Advisory	3
Cold
Freeze Warning	2
Wind Chill Warning	1
Freeze Watch	1
Wind Chill Watch	1
Frost Advisory	2
Wind Chill Advisory	11
Wind and dust
High Wind Warning	2
Wind Advisory	15
Fire
Red Flag Warning	6
Fire Weather Watch	1
Fog and smoke
Dense Fog Advisory	5

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.