Weather alerts in Lyon County, Minnesota, 2023

91 weather alerts in 2023, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Lyon County and its neighbors

Each county as a circle sized by its count in 2023. Tap one for its archive.

Alerts: 91
Warnings: 22
Watches: 9
Advisories: 45
Busiest month: July17 alerts
Busiest day: July 13, 20234 alerts

Over time

By month

Warning verification

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

Lyon County, 2023

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	0			0
Severe thunderstorm warnings	15	8	47%	8	50%	9 min
Flash flood warnings	0			0

Each office's whole area, 2023

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Sioux Falls, SD: tornado warnings	23	6	74%	16	50%	13 min
NWS Sioux Falls, SD: severe thunderstorm warnings	228	126	45%	282	82%	18 min
NWS Sioux Falls, SD: flash flood warnings	9	3	67%	12	75%	47 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, 2:10 PM CST	Winter Storm Warning	FSD	61 hr
Jan 3, 3:04 AM CST	Winter Weather Advisory	FSD	45 hr
Jan 3, 6:09 AM CST	Mesoscale Discussion	SPC	6 hr
Jan 6, 10:05 PM CST	Dense Fog Advisory	FSD	14 hr
Jan 10, 3:18 AM CST	Dense Fog Advisory	FSD	12 hr
Jan 11, 3:18 AM CST	Dense Fog Advisory	FSD	11 hr
Jan 15, 3:02 PM CST	Winter Weather Advisory	FSD	37 hr
Jan 17, 3:11 PM CST	Winter Weather Advisory	FSD	42 hr
Jan 21, 5:56 PM CST	Dense Fog Advisory	FSD	18 hr
Jan 28, 1:41 PM CST	Wind Chill Advisory	FSD	20 hr
Jan 29, 1:48 PM CST	Wind Chill Advisory	FSD	22 hr
Jan 30, 2:28 PM CST	Wind Chill Advisory	FSD	20 hr
Feb 2, 3:35 AM CST	Wind Chill Advisory	FSD	29 hr
Feb 9, 2:50 AM CST	Wind Advisory	FSD	14 hr
Feb 14, 2:51 AM CST	Winter Weather Advisory	FSD	30 hr
Feb 18, 11:40 PM CST	Dense Fog Advisory	FSD	6 hr
Feb 19, 2:50 PM CST	Winter Storm Watch	FSD	36 hr
Feb 20, 3:01 PM CST	Winter Weather Advisory	FSD	38 hr
Feb 21, 2:52 AM CST	Blizzard Warning	FSD	57 hr
Feb 22, 11:45 PM CST	Mesoscale Discussion	SPC	6 hr
Feb 23, 2:25 PM CST	Wind Chill Advisory	FSD	20 hr
Feb 27, 2:19 AM CST	Dense Fog Advisory	FSD	10 hr
Mar 5, 3:04 AM CST	Winter Weather Advisory	FSD	18 hr
Mar 5, 3:41 PM CST	Mesoscale Discussion	SPC	4 hr
Mar 7, 3:20 AM CST	Winter Storm Watch	FSD	28 hr
Mar 8, 3:30 AM CST	Winter Weather Advisory	FSD	45 hr
Mar 10, 3:05 AM CST	Winter Weather Advisory	FSD	36 hr
Mar 15, 3:29 AM CDT	Winter Storm Watch	FSD	12 hr
Mar 15, 3:26 PM CDT	Winter Weather Advisory	FSD	40 hr
Mar 29, 2:39 PM CDT	Winter Storm Watch	FSD	24 hr
Mar 30, 3:01 PM CDT	Blizzard Warning	FSD	38 hr
Mar 30, 3:01 PM CDT	Winter Weather Advisory	FSD	38 hr
Mar 31, 9:06 AM CDT	Mesoscale Discussion	SPC	6 hr
Apr 3, 2:42 PM CDT	Winter Weather Advisory	FSD	45 hr
Apr 12, 5:20 AM CDT	River Flood Warning	FSD	49 hr
Apr 15, 2:27 PM CDT	Wind Advisory	FSD	29 hr
Apr 30, 3:25 AM CDT	Wind Advisory	FSD	17 hr
May 1, 2:59 PM CDT	Fire Weather Watch	FSD	13 hr
May 2, 3:37 AM CDT	Red Flag Warning	FSD	16 hr
May 10, 8:08 PM CDT	Severe Thunderstorm Warning	FSD	53 min
May 12, 1:22 PM CDT	Flood Watch	FSD	48 hr
May 31, 2:11 PM CDT	Mesoscale Discussion	SPC	94 min
May 31, 3:57 PM CDT	Severe Thunderstorm Warning	FSD	33 min
Jun 24, 5:55 AM CDT	Severe Thunderstorm Warning Considerable damage threat	FSD	35 min
Jul 3, 3:48 PM CDT	Mesoscale Discussion	SPC	117 min
Jul 13, 1:28 PM CDT	Mesoscale Discussion	SPC	2 hr
Jul 13, 4:48 PM CDT	Mesoscale Discussion	SPC	87 min
Jul 13, 5:22 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 13, 6:06 PM CDT	Severe Thunderstorm Warning Considerable damage threat	FSD	41 min
Jul 13, 7:17 PM CDT	Mesoscale Discussion	SPC	88 min
Jul 14, 3:10 PM CDT	Mesoscale Discussion	SPC	3 hr
Jul 19, 3:14 PM CDT	Severe Thunderstorm Warning	FSD	46 min
Jul 19, 3:17 PM CDT	Mesoscale Discussion	SPC	88 min
Jul 19, 3:59 PM CDT	Severe Thunderstorm Warning	FSD	28 min
Jul 22, 3:20 PM CDT	Severe Thunderstorm Warning	FSD	40 min
Jul 22, 3:36 PM CDT	Mesoscale Discussion	SPC	114 min
Jul 22, 3:51 PM CDT	Severe Thunderstorm Warning	FSD	39 min
Jul 22, 3:55 PM CDT	Severe Thunderstorm Warning	FSD	39 min
Jul 26, 4:14 AM CDT	Heat Advisory	FSD	16 hr
Jul 26, 2:50 PM CDT	Heat Advisory	FSD	29 hr
Jul 27, 8:55 AM CDT	Excessive Heat Warning	FSD	11 hr
Aug 10, 7:44 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Aug 10, 9:05 PM CDT	Mesoscale Discussion	SPC	115 min
Aug 11, 4:16 PM CDT	Severe Thunderstorm Warning	FSD	44 min
Aug 11, 4:53 PM CDT	Severe Thunderstorm Warning	FSD	52 min
Aug 18, 2:40 PM CDT	Heat Advisory	FSD	30 hr
Aug 19, 2:45 PM CDT	Excessive Heat Watch	FSD	24 hr
Aug 20, 2:41 PM CDT	Excessive Heat Warning	FSD	4 days
Aug 24, 2:19 AM CDT	Dense Fog Advisory	FSD	8 hr
Sep 1, 2:09 PM CDT	Heat Advisory	FSD	53 hr
Sep 23, 2:10 PM CDT	Mesoscale Discussion	SPC	3 hr
Sep 28, 4:20 AM CDT	Dense Fog Advisory	FSD	6 hr
Sep 29, 4:54 PM CDT	Severe Thunderstorm Warning	FSD	36 min
Sep 29, 5:09 PM CDT	Severe Thunderstorm Warning	FSD	51 min
Sep 29, 5:14 PM CDT	Mesoscale Discussion	SPC	2 hr
Sep 29, 5:20 PM CDT	Severe Thunderstorm Warning	FSD	40 min
Sep 30, 12:04 AM CDT	Severe Thunderstorm Warning	FSD	26 min
Sep 30, 4:27 AM CDT	Dense Fog Advisory	FSD	5 hr
Oct 6, 2:48 AM CDT	Frost Advisory	FSD	30 hr
Oct 9, 3:04 PM CDT	Frost Advisory	FSD	18 hr
Oct 30, 2:37 PM CDT	Wind Advisory	FSD	19 hr
Nov 13, 2:33 PM CST	Wind Advisory	FSD	26 hr
Nov 15, 2:45 PM CST	Wind Advisory	FSD	23 hr
Dec 3, 7:06 PM CST	Dense Fog Advisory	FSD	16 hr
Dec 8, 1:57 PM CST	Wind Advisory	FSD	28 hr
Dec 11, 1:00 AM CST	Dense Fog Advisory	FSD	8 hr
Dec 16, 2:10 PM CST	Dense Fog Advisory	FSD	10 hr
Dec 17, 5:42 PM CST	Wind Advisory	FSD	11 hr
Dec 21, 6:21 PM CST	Dense Fog Advisory	FSD	18 hr
Dec 22, 3:30 PM CST	Dense Fog Advisory	FSD	22 hr
Dec 24, 2:22 PM CST	Winter Weather Advisory	FSD	46 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	15
Severe Thunderstorm Watch	2
Mesoscale Discussion	15
Flooding
River Flood Warning	1
Flood Watch	1
Winter
Blizzard Warning	2
Winter Storm Warning	1
Winter Storm Watch	4
Winter Weather Advisory	12
Heat
Excessive Heat Warning	2
Excessive Heat Watch	1
Heat Advisory	4
Cold
Frost Advisory	2
Wind Chill Advisory	5
Wind and dust
Wind Advisory	8
Fire
Red Flag Warning	1
Fire Weather Watch	1
Fog and smoke
Dense Fog Advisory	14

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2022 2024

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.