Alert archive / Missouri / Jefferson County

Weather alerts in Jefferson County, Missouri, 2025

140 weather alerts in 2025, 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 2025. Tap one for its archive.

Alerts: 140
Warnings: 58
Watches: 18
Advisories: 35
Busiest month: April44 alerts
Busiest day: May 20, 202511 alerts

Over time

By month

Warning verification

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

7 of 13 tornado warnings covering Jefferson County in 2025 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, 2025

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	13	7	46%	5	100%	12 min
Severe thunderstorm warnings	19	12	37%	36	61%	21 min
Flash flood warnings	3	1	67%	2	0%

Each office's whole area, 2025

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS St. Louis, MO: tornado warnings	93	34	63%	66	76%	16 min
NWS St. Louis, MO: severe thunderstorm warnings	231	103	55%	633	67%	23 min
NWS St. Louis, MO: flash flood warnings	51	19	63%	98	67%	105 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 2, 2:29 PM CST	Winter Storm Watch	LSX	23 hr
Jan 3, 1:29 PM CST	Winter Storm Warning	LSX	65 hr
Jan 5, 2:40 AM CST	Mesoscale Discussion	SPC	5 hr
Jan 5, 7:56 AM CST	Mesoscale Discussion	SPC	4 hr
Jan 8, 1:59 PM CST	Winter Weather Advisory	LSX	52 hr
Jan 20, 2:45 AM CST	Cold Weather Advisory	LSX	36 hr
Jan 30, 8:26 PM CST	Dense Fog Advisory	LSX	11 hr
Feb 11, 3:21 AM CST	Winter Weather Advisory	LSX	39 hr
Feb 12, 6:16 AM CST	Mesoscale Discussion	SPC	6 hr
Feb 16, 1:42 PM CST	Winter Storm Watch	LSX	24 hr
Feb 17, 1:44 PM CST	Winter Weather Advisory	LSX	37 hr
Feb 18, 12:30 PM CST	Cold Weather Advisory	LSX	48 hr
Feb 28, 2:31 AM CST	Red Flag Warning	LSX	17 hr
Mar 3, 2:11 PM CST	Wind Advisory	LSX	35 hr
Mar 5, 1:08 AM CST	High Wind Warning	LSX	10 hr
Mar 5, 1:19 AM CST	Wind Advisory	LSX	17 hr
Mar 13, 2:08 AM CDT	Wind Advisory	LSX	47 hr
Mar 14, 4:03 PM CDT	Tornado Watch	SPC	9 hr
Mar 14, 7:45 PM CDT	Mesoscale Discussion	SPC	2 hr
Mar 14, 8:47 PM CDT	Mesoscale Discussion	SPC	88 min
Mar 14, 9:07 PM CDT	Tornado Warning	LSX	38 min
Mar 14, 9:13 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LSX	47 min
Mar 14, 9:35 PM CDT	Tornado Warning Tornado observed	LSX	40 min
Mar 14, 10:14 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LSX	35 min
Mar 14, 10:28 PM CDT	Tornado Warning	LSX	24 min
Mar 14, 10:42 PM CDT	Mesoscale Discussion	SPC	63 min
Mar 18, 1:18 PM CDT	Wind Advisory	LSX	38 hr
Mar 18, 9:07 PM CDT	Red Flag Warning	LSX	22 hr
Mar 20, 2:30 PM CDT	Red Flag Warning	LSX	29 hr
Mar 23, 7:53 AM CDT	Areal Flood Advisory	LSX	3 hr
Mar 30, 11:04 AM CDT	Mesoscale Discussion	SPC	116 min
Mar 30, 12:17 PM CDT	Mesoscale Discussion	SPC	118 min
Mar 30, 1:50 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LSX	40 min
Mar 30, 1:58 PM CDT	Severe Thunderstorm Warning	LSX	62 min
Mar 30, 2:27 PM CDT	Severe Thunderstorm Warning	LSX	48 min
Mar 30, 2:27 PM CDT	Mesoscale Discussion	SPC	93 min
Apr 1, 1:53 PM CDT	Flood Watch	LSX	4 days
Apr 1, 2:00 PM CDT	Wind Advisory	LSX	28 hr
Apr 2, 8:47 AM CDT	Tornado Watch	SPC	9 hr
Apr 2, 1:56 PM CDT	Mesoscale Discussion	SPC	94 min
Apr 2, 3:25 PM CDT	Tornado Warning	LSX	36 min
Apr 2, 3:55 PM CDT	Tornado Warning	LSX	50 min
Apr 2, 4:19 PM CDT	Tornado Watch	SPC	3 hr
Apr 3, 10:53 AM CDT	River Flood Warning	LSX	7 days
Apr 3, 10:53 AM CDT	River Flood Warning	LSX	7 days
Apr 3, 10:53 AM CDT	River Flood Warning	LSX	5 days
Apr 3, 10:53 AM CDT	River Flood Warning	LSX	7 days
Apr 3, 10:53 AM CDT	River Flood Warning	LSX	6 days
Apr 3, 10:53 AM CDT	River Flood Warning	LSX	7 days
Apr 4, 6:51 PM CDT	Flash Flood Warning	LSX	7 hr
Apr 5, 1:34 AM CDT	Areal Flood Warning	LSX	5 hr
Apr 6, 2:24 AM CDT	Freeze Watch	LSX	23 hr
Apr 6, 2:24 AM CDT	Freeze Warning	LSX	31 hr
Apr 7, 1:23 AM CDT	Freeze Warning	LSX	32 hr
Apr 10, 12:26 PM CDT	Severe Thunderstorm Warning	LSX	49 min
Apr 10, 2:11 PM CDT	Severe Thunderstorm Warning	LSX	49 min
Apr 10, 2:17 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LSX	28 min
Apr 10, 2:53 PM CDT	Severe Thunderstorm Warning	LSX	37 min
Apr 17, 1:54 PM CDT	Flood Watch	LSX	3 days
Apr 18, 2:53 PM CDT	Mesoscale Discussion	SPC	3 hr
Apr 18, 8:56 PM CDT	Severe Thunderstorm Watch	SPC	8 hr
Apr 20, 6:53 AM CDT	River Flood Warning	LSX	61 hr
Apr 20, 2:20 PM CDT	Mesoscale Discussion	SPC	115 min
Apr 20, 3:41 PM CDT	Tornado Watch	SPC	7 hr
Apr 20, 5:40 PM CDT	Mesoscale Discussion	SPC	95 min
Apr 20, 6:56 PM CDT	Severe Thunderstorm Warning	LSX	64 min
Apr 20, 6:58 PM CDT	Severe Thunderstorm Warning	LSX	62 min
Apr 20, 7:28 PM CDT	Tornado Warning	LSX	37 min
Apr 20, 7:46 PM CDT	Mesoscale Discussion	SPC	89 min
Apr 20, 7:53 PM CDT	Severe Thunderstorm Warning	LSX	52 min
Apr 20, 8:57 PM CDT	River Flood Warning	LSX	60 hr
Apr 20, 8:57 PM CDT	River Flood Warning	LSX	67 hr
Apr 20, 8:57 PM CDT	River Flood Warning	LSX	4 days
Apr 21, 11:19 AM CDT	River Flood Warning	LSX	4 days
Apr 29, 7:08 AM CDT	Severe Thunderstorm Warning	LSX	42 min
Apr 29, 8:56 AM CDT	Severe Thunderstorm Watch	SPC	6 hr
Apr 29, 1:00 PM CDT	Areal Flood Advisory	LSX	3 hr
Apr 30, 2:40 PM CDT	Mesoscale Discussion	SPC	2 hr
Apr 30, 4:40 PM CDT	Tornado Watch	SPC	5 hr
Apr 30, 6:30 PM CDT	Mesoscale Discussion	SPC	90 min
May 13, 2:44 AM CDT	Dense Fog Advisory	LSX	5 hr
May 16, 11:41 AM CDT	Mesoscale Discussion	SPC	3 hr
May 16, 11:58 AM CDT	Tornado Watch	SPC	8 hr
May 16, 2:08 PM CDT	Mesoscale Discussion	SPC	2 hr
May 16, 3:45 PM CDT	Severe Thunderstorm Warning	LSX	45 min
May 19, 7:36 PM CDT	Mesoscale Discussion	SPC	2 hr
May 19, 7:53 PM CDT	Severe Thunderstorm Warning	LSX	32 min
May 19, 8:00 PM CDT	Tornado Warning	LSX	24 min
May 19, 8:26 PM CDT	Tornado Watch	SPC	7 hr
May 19, 10:13 PM CDT	Tornado Warning	LSX	32 min
May 19, 10:42 PM CDT	Mesoscale Discussion	SPC	2 hr
May 19, 10:43 PM CDT	Tornado Warning	LSX	32 min
May 19, 11:10 PM CDT	Tornado Warning	LSX	30 min
May 19, 11:33 PM CDT	Tornado Warning	LSX	42 min
May 20, 12:03 AM CDT	Areal Flood Advisory	LSX	6 hr
May 20, 12:12 AM CDT	Tornado Warning	LSX	33 min
Jun 4, 1:43 PM CDT	Mesoscale Discussion	SPC	3 hr
Jun 4, 3:22 PM CDT	Areal Flood Advisory	LSX	113 min
Jun 4, 6:15 PM CDT	Areal Flood Advisory	LSX	3 hr
Jun 7, 12:17 AM CDT	Dense Fog Advisory	LSX	9 hr
Jun 7, 3:41 PM CDT	Mesoscale Discussion	SPC	2 hr
Jun 7, 6:56 PM CDT	Tornado Warning	LSX	34 min
Jun 7, 7:38 PM CDT	Mesoscale Discussion	SPC	97 min
Jun 8, 2:30 PM CDT	Severe Thunderstorm Watch	SPC	8 hr
Jun 8, 8:39 PM CDT	Mesoscale Discussion	SPC	96 min
Jun 17, 4:39 AM CDT	Dense Fog Advisory	LSX	4 hr
Jun 18, 9:46 AM CDT	Tornado Watch	SPC	6 hr
Jun 19, 2:37 AM CDT	Extreme Heat Watch	LSX	35 hr
Jun 19, 1:56 PM CDT	Heat Advisory	LSX	7 days
Jun 20, 2:00 PM CDT	Extreme Heat Warning	LSX	3 days
Jun 27, 3:12 PM CDT	Severe Thunderstorm Warning	LSX	33 min
Jul 6, 12:09 PM CDT	Mesoscale Discussion	SPC	2 hr
Jul 17, 12:53 PM CDT	Mesoscale Discussion	SPC	2 hr
Jul 18, 2:06 PM CDT	Extreme Heat Warning	LSX	12 days
Jul 21, 5:32 AM CDT	Flash Flood Warning	LSX	86 min
Jul 21, 6:58 AM CDT	Areal Flood Advisory	LSX	3 hr
Jul 30, 12:00 PM CDT	Severe Thunderstorm Warning	LSX	24 min
Aug 10, 2:44 PM CDT	Areal Flood Advisory	LSX	3 hr
Aug 12, 5:36 PM CDT	Areal Flood Advisory	LSX	25 min
Aug 12, 6:01 PM CDT	Areal Flood Warning	LSX	5 min
Aug 12, 6:06 PM CDT	Flash Flood Warning	LSX	98 min
Aug 12, 7:44 PM CDT	Areal Flood Advisory	LSX	76 min
Aug 14, 2:34 PM CDT	Heat Advisory	LSX	5 days
Sep 14, 3:12 PM CDT	Mesoscale Discussion	SPC	2 hr
Sep 18, 4:25 PM CDT	Severe Thunderstorm Warning	LSX	35 min
Sep 22, 9:24 PM CDT	Dense Fog Advisory	LSX	9 hr
Oct 18, 3:08 PM CDT	Severe Thunderstorm Warning	LSX	26 min
Oct 31, 2:16 AM CDT	Freeze Watch	LSX	36 hr
Nov 1, 1:55 AM CDT	Freeze Warning	LSX	31 hr
Nov 17, 11:55 PM CST	Mesoscale Discussion	SPC	3 hr
Nov 20, 7:22 PM CST	Dense Fog Advisory	LSX	16 hr
Nov 23, 5:41 PM CST	Dense Fog Advisory	LSX	15 hr
Nov 28, 2:17 AM CST	Winter Weather Advisory	LSX	39 hr
Nov 30, 12:51 PM CST	Winter Weather Advisory	LSX	38 hr
Dec 9, 1:17 PM CST	Wind Advisory	LSX	23 hr
Dec 18, 1:56 AM CST	Wind Advisory	LSX	22 hr
Dec 18, 10:44 AM CST	Mesoscale Discussion	SPC	2 hr
Dec 23, 9:53 PM CST	Dense Fog Advisory	LSX	11 hr
Dec 26, 7:29 PM CST	Dense Fog Advisory	LSX	17 hr
Dec 28, 8:01 AM CST	Wind Advisory	LSX	22 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	19
Tornado Warning	13
Severe Thunderstorm Watch	3
Tornado Watch	8
Mesoscale Discussion	29
Flooding
Areal Flood Warning	2
Flash Flood Warning	3
River Flood Warning	11
Flood Watch	2
Areal Flood Advisory	9
Winter
Winter Storm Warning	1
Winter Storm Watch	2
Winter Weather Advisory	5
Heat
Extreme Heat Warning	2
Extreme Heat Watch	1
Heat Advisory	2
Cold
Freeze Warning	3
Freeze Watch	2
Cold Weather Advisory	2
Wind and dust
High Wind Warning	1
Wind Advisory	8
Fire
Red Flag Warning	3
Fog and smoke
Dense Fog Advisory	9

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2024 2026

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.