Alert archive / Wisconsin / Jefferson County

Weather alerts in Jefferson County, Wisconsin, 2024

190 weather alerts in 2024, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Jefferson County and its neighbors

Each county as a circle sized by its count in 2024. Tap one for its archive.

Alerts: 190
Warnings: 73
Watches: 28
Advisories: 39
Busiest month: June51 alerts
Busiest day: May 22, 202410 alerts

Over time

By month

Warning verification

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

2 of 11 tornado warnings covering Jefferson County in 2024 had a tornado report inside them; 5 of 5 tornado reports fell inside a warning, on average 12 minutes after it went out.

Jefferson County, 2024

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	11	2	82%	5	100%	12 min
Severe thunderstorm warnings	40	19	53%	4	50%	13 min
Flash flood warnings	3	0	100%	0

Each office's whole area, 2024

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Milwaukee, WI: tornado warnings	55	11	80%	24	79%	13 min
NWS Milwaukee, WI: severe thunderstorm warnings	174	84	52%	283	78%	25 min
NWS Milwaukee, WI: flash flood warnings	16	4	75%	21	24%	22 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 7, 2:02 PM CST	Winter Storm Watch	MKX	24 hr
Jan 8, 2:41 AM CST	Winter Storm Warning	MKX	48 hr
Jan 8, 2:41 AM CST	Winter Weather Advisory	MKX	27 hr
Jan 9, 1:09 PM CST	Mesoscale Discussion	SPC	3 hr
Jan 10, 2:49 PM CST	Winter Storm Watch	MKX	23 hr
Jan 11, 1:36 PM CST	Winter Storm Warning	MKX	37 hr
Jan 12, 4:23 AM CST	Mesoscale Discussion	SPC	4 hr
Jan 12, 10:24 AM CST	Mesoscale Discussion	SPC	4 hr
Jan 13, 2:55 AM CST	Wind Chill Advisory	MKX	4 days
Jan 13, 2:55 AM CST	Winter Weather Advisory	MKX	12 hr
Jan 13, 2:59 PM CST	Winter Weather Advisory	MKX	12 hr
Jan 19, 2:54 AM CST	Wind Chill Advisory	MKX	30 hr
Jan 20, 2:01 AM CST	Wind Chill Advisory	MKX	31 hr
Jan 22, 2:08 PM CST	Winter Weather Advisory	MKX	24 hr
Jan 23, 2:14 PM CST	Dense Fog Advisory	MKX	22 hr
Jan 24, 2:17 PM CST	Dense Fog Advisory	MKX	40 hr
Jan 26, 1:21 PM CST	Dense Fog Advisory	MKX	23 hr
Jan 27, 1:27 PM CST	Dense Fog Advisory	MKX	10 hr
Feb 5, 9:36 PM CST	Dense Fog Advisory	MKX	14 hr
Feb 6, 5:40 PM CST	Dense Fog Advisory	MKX	16 hr
Feb 8, 5:28 PM CST	Severe Thunderstorm Warning	MKX	47 min
Feb 8, 5:50 PM CST	Tornado Warning Tornado observedConsiderable damage threat	MKX	40 min
Feb 8, 5:55 PM CST	Severe Thunderstorm Warning	MKX	50 min
Feb 8, 6:24 PM CST	Tornado Warning	MKX	19 min
Feb 8, 6:33 PM CST	Severe Thunderstorm Warning	MKX	27 min
Feb 8, 6:42 PM CST	Severe Thunderstorm Warning	MKX	33 min
Feb 14, 3:17 AM CST	Winter Weather Advisory	MKX	29 hr
Feb 15, 2:00 AM CST	Mesoscale Discussion	SPC	4 hr
Mar 4, 1:25 PM CST	Mesoscale Discussion	SPC	2 hr
Mar 21, 2:25 AM CDT	Winter Weather Advisory	MKX	37 hr
Apr 2, 3:41 AM CDT	Winter Weather Advisory	MKX	31 hr
Apr 5, 3:28 PM CDT	River Flood Watch	MKX	44 hr
Apr 16, 5:52 PM CDT	Tornado Watch	SPC	4 hr
Apr 16, 7:32 PM CDT	Mesoscale Discussion	SPC	88 min
Apr 16, 8:42 PM CDT	Severe Thunderstorm Warning	MKX	48 min
Apr 16, 9:34 PM CDT	Special Weather Statement	MKX	41 min
Apr 20, 2:05 PM CDT	Freeze Warning	MKX	18 hr
Apr 24, 3:15 AM CDT	Freeze Watch	MKX	11 hr
Apr 24, 2:01 PM CDT	Freeze Warning	MKX	18 hr
Apr 27, 5:05 PM CDT	Special Weather Statement	MKX	25 min
Apr 27, 5:20 PM CDT	Severe Thunderstorm Warning	MKX	29 min
Apr 27, 6:47 PM CDT	Severe Thunderstorm Watch	SPC	5 hr
Apr 27, 10:01 PM CDT	Severe Thunderstorm Warning	MKX	74 min
May 4, 4:13 PM CDT	Special Weather Statement	MKX	32 min
May 7, 7:39 PM CDT	Severe Thunderstorm Warning	MKX	36 min
May 7, 7:47 PM CDT	Severe Thunderstorm Warning	MKX	43 min
May 7, 7:56 PM CDT	Tornado Warning	MKX	34 min
May 7, 8:10 PM CDT	Severe Thunderstorm Warning	MKX	50 min
May 7, 8:15 PM CDT	Tornado Warning	MKX	30 min
May 7, 8:23 PM CDT	Severe Thunderstorm Warning	MKX	37 min
May 10, 8:57 PM CDT	Special Weather Statement	MKX	63 min
May 12, 5:08 PM CDT	Special Weather Statement	MKX	67 min
May 16, 2:42 PM CDT	Special Weather Statement	MKX	48 min
May 16, 3:17 PM CDT	Special Weather Statement	MKX	43 min
May 20, 10:13 AM CDT	Mesoscale Discussion	SPC	92 min
May 20, 12:39 PM CDT	Severe Thunderstorm Watch	SPC	3 hr
May 20, 11:44 PM CDT	Dense Fog Advisory	MKX	10 hr
May 21, 12:43 PM CDT	Severe Thunderstorm Warning	MKX	28 min
May 21, 1:15 PM CDT	Mesoscale Discussion	SPC	90 min
May 21, 3:58 PM CDT	Tornado Watch	SPC	9 hr
May 21, 7:51 PM CDT	Severe Thunderstorm Warning Considerable damage threat	MKX	39 min
May 21, 7:56 PM CDT	Mesoscale Discussion	SPC	64 min
May 21, 8:32 PM CDT	Severe Thunderstorm Warning Considerable damage threat	MKX	71 min
May 21, 9:13 PM CDT	Severe Thunderstorm Warning	MKX	32 min
May 21, 10:14 PM CDT	Severe Thunderstorm Warning	MKX	46 min
May 21, 10:25 PM CDT	Severe Thunderstorm Warning	MKX	50 min
May 21, 10:40 PM CDT	Tornado Warning	MKX	19 min
May 21, 10:45 PM CDT	Tornado Warning	MKX	30 min
May 21, 10:48 PM CDT	Severe Thunderstorm Warning	MKX	42 min
May 21, 11:33 PM CDT	Severe Thunderstorm Warning	MKX	42 min
May 24, 10:25 AM CDT	Special Weather Statement	MKX	50 min
May 24, 10:36 AM CDT	Severe Thunderstorm Warning	MKX	39 min
May 24, 4:35 PM CDT	Special Weather Statement	MKX	40 min
May 24, 4:46 PM CDT	Mesoscale Discussion	SPC	119 min
May 26, 5:22 PM CDT	Tornado Warning Tornado observed	MKX	23 min
May 26, 5:40 PM CDT	Tornado Warning Tornado observed	MKX	35 min
May 26, 5:53 PM CDT	Mesoscale Discussion	SPC	67 min
May 28, 1:02 PM CDT	Mesoscale Discussion	SPC	3 hr
Jun 1, 9:01 PM CDT	Dense Fog Advisory	MKX	12 hr
Jun 3, 1:06 PM CDT	Special Weather Statement	MKX	39 min
Jun 3, 3:36 PM CDT	Severe Thunderstorm Warning	MKX	24 min
Jun 3, 4:14 PM CDT	Severe Thunderstorm Warning	MKX	23 min
Jun 3, 4:46 PM CDT	Flood Watch	MKX	8 hr
Jun 3, 5:27 PM CDT	Areal Flood Advisory	MKX	2 hr
Jun 3, 6:25 PM CDT	Severe Thunderstorm Warning	MKX	39 min
Jun 3, 6:28 PM CDT	Flash Flood Warning	MKX	3 hr
Jun 3, 6:56 PM CDT	Severe Thunderstorm Warning	MKX	34 min
Jun 3, 7:08 PM CDT	Tornado Warning	MKX	22 min
Jun 3, 7:25 PM CDT	Areal Flood Advisory	MKX	2 hr
Jun 3, 7:26 PM CDT	Special Weather Statement	MKX	34 min
Jun 4, 11:15 AM CDT	River Flood Watch	MKX	15 hr
Jun 4, 11:15 AM CDT	River Flood Watch	MKX	29 hr
Jun 4, 8:36 PM CDT	Special Weather Statement	MKX	24 min
Jun 5, 2:40 AM CDT	River Flood Warning	MKX	21 days
Jun 5, 9:58 AM CDT	River Flood Watch	MKX	21 days
Jun 5, 9:58 AM CDT	River Flood Watch	MKX	3 days
Jun 5, 3:57 PM CDT	River Flood Warning	MKX	21 days
Jun 5, 8:26 PM CDT	Special Weather Statement	MKX	49 min
Jun 14, 4:18 AM CDT	River Flood Warning	MKX	69 hr
Jun 16, 2:15 PM CDT	Severe Thunderstorm Watch	SPC	5 hr
Jun 16, 4:50 PM CDT	Severe Thunderstorm Warning	MKX	55 min
Jun 17, 3:00 PM CDT	Mesoscale Discussion	SPC	2 hr
Jun 19, 3:58 PM CDT	Mesoscale Discussion	SPC	92 min
Jun 21, 3:21 AM CDT	Flood Watch	MKX	43 hr
Jun 21, 3:57 PM CDT	Severe Thunderstorm Warning	MKX	48 min
Jun 21, 4:04 PM CDT	Special Weather Statement	MKX	26 min
Jun 21, 4:25 PM CDT	Severe Thunderstorm Warning	MKX	32 min
Jun 22, 12:56 PM CDT	Mesoscale Discussion	SPC	2 hr
Jun 22, 3:13 PM CDT	Tornado Watch	SPC	6 hr
Jun 22, 4:11 PM CDT	River Flood Watch	MKX	21 days
Jun 22, 6:47 PM CDT	Severe Thunderstorm Warning	MKX	43 min
Jun 22, 6:53 PM CDT	Severe Thunderstorm Warning	MKX	52 min
Jun 22, 7:09 PM CDT	Tornado Warning	MKX	36 min
Jun 22, 7:27 PM CDT	Severe Thunderstorm Warning	MKX	48 min
Jun 22, 7:29 PM CDT	Tornado Warning	MKX	31 min
Jun 22, 7:29 PM CDT	Mesoscale Discussion	SPC	91 min
Jun 22, 7:40 PM CDT	Flash Flood Warning	MKX	3 hr
Jun 22, 7:52 PM CDT	Severe Thunderstorm Warning	MKX	53 min
Jun 24, 4:57 AM CDT	River Flood Warning	MKX	19 days
Jun 24, 5:24 PM CDT	River Flood Watch	MKX	12 hr
Jun 24, 7:31 PM CDT	Severe Thunderstorm Watch	SPC	3 hr
Jun 25, 12:21 AM CDT	Special Weather Statement	MKX	39 min
Jun 25, 4:09 AM CDT	Mesoscale Discussion	SPC	96 min
Jun 25, 4:52 AM CDT	Special Weather Statement	MKX	38 min
Jun 25, 5:00 AM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 25, 5:28 AM CDT	River Flood Warning	MKX	5 hr
Jun 25, 5:31 AM CDT	Special Weather Statement	MKX	59 min
Jun 25, 5:44 AM CDT	Severe Thunderstorm Warning	MKX	31 min
Jun 29, 10:34 AM CDT	River Flood Warning	MKX	11 days
Jul 1, 9:44 PM CDT	River Flood Watch	MKX	13 hr
Jul 2, 10:25 AM CDT	River Flood Warning	MKX	9 days
Jul 4, 10:50 PM CDT	River Flood Watch	MKX	11 hr
Jul 5, 10:03 AM CDT	River Flood Warning	MKX	54 hr
Jul 13, 3:38 PM CDT	Severe Thunderstorm Watch	SPC	8 hr
Jul 13, 7:56 PM CDT	Special Weather Statement	MKX	64 min
Jul 13, 9:07 PM CDT	Areal Flood Advisory	MKX	3 hr
Jul 13, 11:39 PM CDT	Flash Flood Warning	MKX	3 hr
Jul 14, 3:29 AM CDT	River Flood Warning	MKX	8 days
Jul 14, 5:12 AM CDT	Areal Flood Advisory	MKX	3 hr
Jul 14, 5:33 AM CDT	Special Weather Statement	MKX	42 min
Jul 14, 5:44 AM CDT	Severe Thunderstorm Warning	MKX	46 min
Jul 14, 8:17 AM CDT	River Flood Watch	MKX	38 hr
Jul 14, 3:15 PM CDT	Mesoscale Discussion	SPC	90 min
Jul 14, 5:55 PM CDT	Severe Thunderstorm Watch	SPC	9 hr
Jul 14, 9:13 PM CDT	Severe Thunderstorm Warning	MKX	33 min
Jul 15, 9:09 AM CDT	River Flood Warning	MKX	21 days
Jul 15, 1:59 PM CDT	Mesoscale Discussion	SPC	3 hr
Jul 15, 3:18 PM CDT	Severe Thunderstorm Watch	SPC	8 hr
Jul 15, 7:34 PM CDT	Areal Flood Advisory	MKX	3 hr
Jul 15, 8:40 PM CDT	Areal Flood Advisory	MKX	3 hr
Jul 15, 10:04 PM CDT	River Flood Warning	MKX	21 days
Jul 15, 10:11 PM CDT	River Flood Warning	MKX	6 days
Aug 1, 2:06 PM CDT	Mesoscale Discussion	SPC	114 min
Aug 1, 6:17 PM CDT	Special Weather Statement	MKX	43 min
Aug 1, 7:04 PM CDT	Special Weather Statement	MKX	56 min
Aug 1, 7:42 PM CDT	Severe Thunderstorm Warning	MKX	19 min
Aug 1, 7:56 PM CDT	Special Weather Statement	MKX	64 min
Aug 5, 2:48 AM CDT	Flood Watch	MKX	25 hr
Aug 5, 5:09 PM CDT	Mesoscale Discussion	SPC	66 min
Aug 6, 1:14 AM CDT	Special Weather Statement	MKX	61 min
Aug 6, 1:21 AM CDT	Severe Thunderstorm Warning	MKX	24 min
Aug 6, 2:03 AM CDT	Severe Thunderstorm Warning	MKX	42 min
Aug 16, 1:53 PM CDT	Mesoscale Discussion	SPC	3 hr
Aug 16, 5:31 PM CDT	Mesoscale Discussion	SPC	119 min
Aug 25, 3:06 AM CDT	Excessive Heat Warning	MKX	41 hr
Aug 25, 3:06 AM CDT	Heat Advisory	MKX	41 hr
Aug 25, 2:45 PM CDT	Excessive Heat Watch	MKX	24 hr
Aug 26, 2:31 PM CDT	Excessive Heat Warning	MKX	28 hr
Aug 27, 11:16 AM CDT	Special Weather Statement	MKX	44 min
Aug 27, 11:25 AM CDT	Mesoscale Discussion	SPC	3 hr
Aug 27, 11:29 AM CDT	Severe Thunderstorm Warning	MKX	31 min
Aug 27, 11:59 AM CDT	Severe Thunderstorm Warning	MKX	46 min
Aug 27, 12:13 PM CDT	Severe Thunderstorm Warning	MKX	32 min
Oct 15, 1:18 AM CDT	Freeze Warning	MKX	32 hr
Oct 30, 2:22 PM CDT	Wind Advisory	MKX	32 hr
Oct 31, 9:44 AM CDT	Special Weather Statement	MKX	91 min
Nov 17, 11:40 PM CST	Dense Fog Advisory	MKX	7 hr
Nov 20, 3:17 AM CST	Winter Weather Advisory	MKX	33 hr
Nov 21, 2:43 AM CST	Wind Advisory	MKX	11 hr
Nov 21, 4:09 AM CST	Mesoscale Discussion	SPC	4 hr
Dec 4, 2:08 AM CST	Wind Advisory	MKX	22 hr
Dec 11, 3:14 PM CST	Cold Weather Advisory	MKX	19 hr
Dec 13, 2:00 PM CST	Winter Weather Advisory	MKX	34 hr
Dec 15, 4:11 AM CST	Dense Fog Advisory	MKX	30 hr
Dec 15, 3:02 PM CST	Dense Fog Advisory	MKX	18 hr
Dec 18, 1:22 PM CST	Winter Weather Advisory	MKX	44 hr
Dec 22, 2:36 PM CST	Winter Weather Advisory	MKX	28 hr
Dec 26, 1:51 AM CST	Dense Fog Advisory	MKX	7 hr
Dec 26, 9:08 AM CST	Dense Fog Advisory	MKX	27 hr
Dec 28, 9:30 PM CST	Dense Fog Advisory	MKX	15 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	40
Tornado Warning	11
Severe Thunderstorm Watch	8
Tornado Watch	3
Mesoscale Discussion	25
Special Weather Statement	25
Flooding
Flash Flood Warning	3
River Flood Warning	12
Flood Watch	3
River Flood Watch	10
Areal Flood Advisory	6
Winter
Winter Storm Warning	2
Winter Storm Watch	2
Winter Weather Advisory	11
Heat
Excessive Heat Warning	2
Excessive Heat Watch	1
Heat Advisory	1
Cold
Freeze Warning	3
Freeze Watch	1
Cold Weather Advisory	1
Wind Chill Advisory	3
Wind and dust
Wind Advisory	3
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 2023 2025

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.