Alert archive / Missouri / Saint Charles County

Weather alerts in Saint Charles County, Missouri, 2024

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

Saint Charles County and its neighbors

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

Alerts: 150
Warnings: 75
Watches: 19
Advisories: 25
Busiest month: April32 alerts
Busiest day: March 14, 202417 alerts

Over time

By month

Warning verification

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

0 of 8 tornado warnings covering Saint Charles County in 2024 had a tornado report inside them; 0 of 3 tornado reports fell inside a warning.

Saint Charles County, 2024

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	8	0	100%	3	0%
Severe thunderstorm warnings	40	20	50%	91	36%	23 min
Flash flood warnings	4	3	25%	7	100%	72 min

Each office's whole area, 2024

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS St. Louis, MO: tornado warnings	80	25	69%	57	56%	14 min
NWS St. Louis, MO: severe thunderstorm warnings	378	178	53%	985	64%	24 min
NWS St. Louis, MO: flash flood warnings	59	32	46%	123	85%	86 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 8, 2:41 AM CST	Winter Weather Advisory	LSX	40 hr
Jan 11, 12:56 PM CST	Wind Advisory	LSX	38 hr
Jan 12, 2:57 AM CST	Wind Chill Warning	LSX	4 days
Jan 12, 2:07 PM CST	Wind Chill Advisory	LSX	5 days
Jan 18, 2:48 AM CST	Wind Chill Advisory	LSX	57 hr
Jan 21, 1:53 AM CST	Winter Weather Advisory	LSX	43 hr
Jan 22, 3:27 AM CST	Mesoscale Discussion	SPC	5 hr
Jan 23, 4:12 PM CST	Dense Fog Advisory	LSX	67 hr
Feb 15, 1:06 PM CST	Winter Weather Advisory	LSX	28 hr
Feb 25, 1:35 PM CST	Red Flag Warning	LSX	28 hr
Feb 26, 12:23 PM CST	Red Flag Warning	LSX	31 hr
Mar 13, 2:56 PM CDT	Mesoscale Discussion	SPC	3 hr
Mar 13, 3:50 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Mar 13, 7:24 PM CDT	Severe Thunderstorm Warning	LSX	51 min
Mar 13, 7:44 PM CDT	Mesoscale Discussion	SPC	2 hr
Mar 14, 4:41 AM CDT	Severe Thunderstorm Watch	SPC	7 hr
Mar 14, 7:25 AM CDT	Severe Thunderstorm Warning	LSX	50 min
Mar 14, 7:28 AM CDT	Tornado Warning	LSX	22 min
Mar 14, 7:33 AM CDT	Tornado Warning	LSX	27 min
Mar 14, 7:39 AM CDT	Mesoscale Discussion	SPC	2 hr
Mar 14, 7:47 AM CDT	Severe Thunderstorm Warning	LSX	43 min
Mar 14, 12:58 PM CDT	Mesoscale Discussion	SPC	92 min
Mar 14, 1:33 PM CDT	Tornado Watch	SPC	7 hr
Mar 14, 3:39 PM CDT	Tornado Warning	LSX	51 min
Mar 14, 3:55 PM CDT	Mesoscale Discussion	SPC	65 min
Mar 14, 4:11 PM CDT	Tornado Warning	LSX	41 min
Mar 14, 5:13 PM CDT	Severe Thunderstorm Warning	LSX	47 min
Mar 14, 5:55 PM CDT	Severe Thunderstorm Warning	LSX	50 min
Mar 14, 6:09 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LSX	51 min
Mar 14, 6:42 PM CDT	Severe Thunderstorm Warning	LSX	27 min
Mar 24, 2:18 PM CDT	Wind Advisory	LSX	29 hr
Apr 1, 12:35 PM CDT	Mesoscale Discussion	SPC	115 min
Apr 1, 3:50 PM CDT	Mesoscale Discussion	SPC	115 min
Apr 1, 4:49 PM CDT	Tornado Watch	SPC	7 hr
Apr 1, 5:49 PM CDT	Severe Thunderstorm Warning	LSX	56 min
Apr 1, 6:26 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LSX	49 min
Apr 1, 6:45 PM CDT	Mesoscale Discussion	SPC	90 min
Apr 1, 7:32 PM CDT	Severe Thunderstorm Warning	LSX	58 min
Apr 1, 8:13 PM CDT	Severe Thunderstorm Warning	LSX	22 min
Apr 1, 10:37 PM CDT	Tornado Watch	SPC	4 hr
Apr 1, 11:26 PM CDT	Mesoscale Discussion	SPC	94 min
Apr 5, 2:33 AM CDT	Frost Advisory	LSX	29 hr
Apr 16, 2:33 PM CDT	Severe Thunderstorm Warning	LSX	42 min
Apr 16, 2:45 PM CDT	Severe Thunderstorm Warning	LSX	30 min
Apr 16, 2:48 PM CDT	Wind Advisory	LSX	6 hr
Apr 16, 3:14 PM CDT	Severe Thunderstorm Warning	LSX	46 min
Apr 16, 3:21 PM CDT	Severe Thunderstorm Watch	SPC	5 hr
Apr 18, 12:08 PM CDT	Mesoscale Discussion	SPC	2 hr
Apr 18, 12:56 PM CDT	Severe Thunderstorm Watch	SPC	8 hr
Apr 18, 3:09 PM CDT	Mesoscale Discussion	SPC	2 hr
Apr 18, 4:40 PM CDT	Severe Thunderstorm Warning	LSX	50 min
Apr 18, 4:48 PM CDT	Tornado Warning	LSX	42 min
Apr 18, 4:58 PM CDT	Severe Thunderstorm Warning	LSX	47 min
Apr 18, 5:12 PM CDT	Severe Thunderstorm Warning	LSX	48 min
Apr 18, 5:39 PM CDT	Severe Thunderstorm Warning	LSX	66 min
Apr 21, 1:54 PM CDT	Frost Advisory	LSX	18 hr
Apr 27, 9:15 PM CDT	Mesoscale Discussion	SPC	60 min
Apr 27, 9:41 PM CDT	Tornado Watch	SPC	6 hr
Apr 28, 1:54 AM CDT	Mesoscale Discussion	SPC	66 min
Apr 29, 10:02 AM CDT	River Flood Warning	LSX	5 days
Apr 29, 11:46 AM CDT	River Flood Warning	LSX	5 days
Apr 29, 11:46 AM CDT	River Flood Warning	LSX	4 days
Apr 29, 11:46 AM CDT	River Flood Warning	LSX	5 days
May 4, 3:53 PM CDT	Mesoscale Discussion	SPC	97 min
May 4, 4:38 PM CDT	Severe Thunderstorm Warning	LSX	67 min
May 5, 9:25 AM CDT	River Flood Warning	LSX	52 hr
May 6, 7:28 AM CDT	River Flood Warning	LSX	44 hr
May 7, 12:53 AM CDT	Tornado Watch	SPC	7 hr
May 7, 2:29 AM CDT	Mesoscale Discussion	SPC	2 hr
May 7, 4:16 AM CDT	Severe Thunderstorm Warning	LSX	44 min
May 7, 4:23 AM CDT	Tornado Warning	LSX	37 min
May 7, 4:42 AM CDT	Mesoscale Discussion	SPC	2 hr
May 8, 8:38 PM CDT	River Flood Warning	LSX	3 days
May 8, 10:05 PM CDT	River Flood Warning	LSX	5 days
May 15, 8:11 AM CDT	River Flood Warning	LSX	4 days
May 17, 9:16 PM CDT	River Flood Warning	LSX	70 hr
May 21, 5:56 PM CDT	Tornado Watch	SPC	6 hr
May 21, 7:35 PM CDT	Severe Thunderstorm Warning	LSX	40 min
May 21, 8:53 PM CDT	Severe Thunderstorm Warning	LSX	30 min
May 24, 11:57 AM CDT	Mesoscale Discussion	SPC	2 hr
May 24, 2:39 PM CDT	Severe Thunderstorm Watch	SPC	10 hr
May 24, 3:57 PM CDT	Mesoscale Discussion	SPC	93 min
May 24, 5:24 PM CDT	Severe Thunderstorm Warning	LSX	51 min
May 24, 6:19 PM CDT	Mesoscale Discussion	SPC	116 min
May 24, 8:25 PM CDT	Severe Thunderstorm Warning	LSX	50 min
May 24, 8:49 PM CDT	Mesoscale Discussion	SPC	86 min
May 25, 2:06 PM CDT	Flood Watch	LSX	32 hr
May 26, 4:01 PM CDT	Tornado Watch PDS	SPC	7 hr
May 26, 4:37 PM CDT	Severe Thunderstorm Warning	LSX	38 min
May 26, 4:47 PM CDT	Severe Thunderstorm Warning	LSX	43 min
May 26, 5:01 PM CDT	Areal Flood Advisory	LSX	3 hr
May 26, 5:05 PM CDT	Areal Flood Advisory	LSX	3 hr
May 26, 5:11 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LSX	38 min
May 26, 5:27 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LSX	35 min
May 26, 5:48 PM CDT	Severe Thunderstorm Warning	LSX	15 min
Jun 13, 7:48 PM CDT	Mesoscale Discussion	SPC	87 min
Jun 13, 8:12 PM CDT	Severe Thunderstorm Watch	SPC	5 hr
Jun 24, 2:59 AM CDT	Heat Advisory	LSX	40 hr
Jun 25, 5:43 PM CDT	Mesoscale Discussion	SPC	62 min
Jun 26, 1:17 AM CDT	Mesoscale Discussion	SPC	118 min
Jul 1, 12:54 PM CDT	River Flood Warning	LSX	15 days
Jul 1, 12:54 PM CDT	River Flood Warning	LSX	26 days
Jul 3, 7:29 AM CDT	Flash Flood Warning	LSX	3 hr
Jul 3, 10:33 AM CDT	River Flood Warning	LSX	21 days
Jul 3, 11:42 AM CDT	River Flood Warning	LSX	21 days
Jul 3, 2:23 PM CDT	Flood Watch	LSX	37 hr
Jul 4, 3:05 AM CDT	Areal Flood Advisory	LSX	5 hr
Jul 4, 4:16 AM CDT	Flash Flood Warning	LSX	4 hr
Jul 4, 5:18 PM CDT	River Flood Warning	LSX	11 hr
Jul 8, 2:37 AM CDT	Flood Watch	LSX	48 hr
Jul 8, 3:32 PM CDT	Severe Thunderstorm Warning	LSX	14 min
Jul 8, 4:08 PM CDT	Areal Flood Advisory	LSX	42 min
Jul 9, 12:03 PM CDT	Areal Flood Advisory	LSX	6 hr
Jul 13, 2:29 PM CDT	Heat Advisory	LSX	68 hr
Jul 16, 2:17 AM CDT	Flood Watch	LSX	29 hr
Jul 16, 8:45 AM CDT	Mesoscale Discussion	SPC	90 min
Jul 16, 10:51 AM CDT	Severe Thunderstorm Warning	LSX	54 min
Jul 16, 11:35 AM CDT	Flash Flood Warning	LSX	3 hr
Jul 16, 12:01 PM CDT	Flash Flood Warning	LSX	3 hr
Jul 16, 12:02 PM CDT	Mesoscale Discussion	SPC	88 min
Jul 16, 3:24 PM CDT	River Flood Warning	LSX	12 hr
Jul 16, 5:42 PM CDT	River Flood Warning	LSX	4 days
Jul 21, 9:34 PM CDT	Areal Flood Advisory	LSX	2 hr
Jul 28, 3:27 AM CDT	Excessive Heat Warning	LSX	5 days
Jul 28, 5:26 PM CDT	Severe Thunderstorm Warning	LSX	25 min
Jul 30, 1:56 PM CDT	Mesoscale Discussion	SPC	2 hr
Jul 30, 2:58 PM CDT	Severe Thunderstorm Watch	SPC	8 hr
Jul 30, 3:35 PM CDT	Severe Thunderstorm Warning	LSX	40 min
Jul 30, 4:37 PM CDT	Severe Thunderstorm Warning	LSX	26 min
Aug 1, 2:19 AM CDT	Mesoscale Discussion	SPC	86 min
Aug 5, 2:04 PM CDT	Heat Advisory	LSX	28 hr
Aug 15, 10:12 PM CDT	Severe Thunderstorm Warning	LSX	27 min
Aug 25, 2:17 PM CDT	Heat Advisory	LSX	5 days
Aug 27, 5:16 PM CDT	Mesoscale Discussion	SPC	119 min
Aug 29, 3:59 PM CDT	Severe Thunderstorm Warning	LSX	26 min
Aug 30, 3:41 PM CDT	Mesoscale Discussion	SPC	3 hr
Aug 30, 3:57 PM CDT	Severe Thunderstorm Warning	LSX	28 min
Oct 14, 2:13 PM CDT	Freeze Warning	LSX	43 hr
Oct 31, 2:15 AM CDT	Severe Thunderstorm Warning	LSX	39 min
Oct 31, 2:26 AM CDT	Tornado Warning	LSX	28 min
Nov 4, 7:43 PM CST	Flood Watch	LSX	16 hr
Nov 4, 9:38 PM CST	Severe Thunderstorm Warning	LSX	37 min
Nov 4, 9:44 PM CST	Tornado Warning Tornado observed	LSX	16 min
Nov 4, 10:03 PM CST	Severe Thunderstorm Warning	LSX	42 min
Nov 5, 12:13 AM CST	Areal Flood Advisory	LSX	3 hr
Nov 5, 12:55 AM CST	Areal Flood Advisory	LSX	3 hr
Nov 5, 3:23 AM CST	River Flood Warning	LSX	28 hr
Nov 14, 12:39 PM CST	Dense Fog Advisory	LSX	20 hr
Nov 29, 2:20 PM CST	Winter Weather Advisory	LSX	32 hr
Nov 30, 9:16 AM CST	Mesoscale Discussion	SPC	3 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	8
Severe Thunderstorm Watch	7
Tornado Watch	7
Mesoscale Discussion	31
Flooding
Flash Flood Warning	4
River Flood Warning	18
Flood Watch	5
Areal Flood Advisory	8
Winter
Winter Weather Advisory	4
Heat
Excessive Heat Warning	1
Heat Advisory	4
Cold
Freeze Warning	1
Wind Chill Warning	1
Frost Advisory	2
Wind Chill Advisory	2
Wind and dust
Wind Advisory	3
Fire
Red Flag Warning	2
Fog and smoke
Dense Fog Advisory	2

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.