Alert archive / Missouri / Saint Charles County

Weather alerts in Saint Charles County, Missouri, 2019

200 weather alerts in 2019, 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 2019. Tap one for its archive.

Alerts: 200
Warnings: 78
Watches: 28
Advisories: 38
Busiest month: May38 alerts
Busiest day: May 21, 201910 alerts

Over time

By month

Warning verification

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

1 of 6 tornado warnings covering Saint Charles County in 2019 had a tornado report inside them; 2 of 2 tornado reports fell inside a warning, on average 28 minutes after it went out.

Saint Charles County, 2019

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	6	1	83%	2	100%	28 min
Severe thunderstorm warnings	36	28	22%	44	84%	24 min
Flash flood warnings	6	5	17%	3	67%	72 min

Each office's whole area, 2019

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS St. Louis, MO: tornado warnings	49	9	82%	29	59%	23 min
NWS St. Louis, MO: severe thunderstorm warnings	241	129	46%	389	76%	24 min
NWS St. Louis, MO: flash flood warnings	55	31	44%	127	94%	128 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
Dec 31, 7:50 PM CST	River Flood Warning	LSX	35 hr
Jan 1, 11:12 AM CST	River Flood Warning	LSX	24 hr
Jan 1, 11:12 AM CST	River Flood Warning	LSX	71 hr
Jan 10, 3:33 AM CST	Winter Storm Watch	LSX	12 hr
Jan 10, 3:31 PM CST	Winter Storm Warning	LSX	62 hr
Jan 11, 2:00 PM CST	Mesoscale Discussion	SPC	6 hr
Jan 11, 6:15 PM CST	Mesoscale Discussion	SPC	4 hr
Jan 15, 3:12 PM CST	Winter Weather Advisory	LSX	19 hr
Jan 17, 4:10 AM CST	Dense Fog Advisory	LSX	8 hr
Jan 18, 2:45 AM CST	Winter Weather Advisory	LSX	41 hr
Jan 28, 3:00 AM CST	Wind Chill Watch	LSX	13 hr
Jan 28, 3:49 PM CST	Wind Chill Warning	LSX	47 hr
Jan 28, 3:49 PM CST	Wind Chill Advisory	LSX	44 hr
Jan 30, 3:47 AM CST	Winter Weather Advisory	LSX	19 hr
Feb 2, 3:34 AM CST	Dense Fog Advisory	LSX	8 hr
Feb 6, 8:50 PM CST	Dense Fog Advisory	LSX	9 hr
Feb 7, 5:16 AM CST	Areal Flood Advisory	LSX	6 hr
Feb 9, 3:17 AM CST	Winter Weather Advisory	LSX	35 hr
Feb 10, 5:41 AM CST	Mesoscale Discussion	SPC	4 hr
Feb 14, 3:01 PM CST	Winter Weather Advisory	LSX	32 hr
Feb 16, 3:25 AM CST	Winter Weather Advisory	LSX	39 hr
Feb 18, 3:20 PM CST	Winter Weather Advisory	LSX	44 hr
Feb 20, 9:09 AM CST	Dense Fog Advisory	LSX	3 hr
Feb 22, 3:45 PM CST	Wind Advisory	LSX	50 hr
Feb 27, 3:16 AM CST	Winter Weather Advisory	LSX	39 hr
Mar 1, 3:36 AM CST	Winter Storm Watch	LSX	24 hr
Mar 2, 3:37 AM CST	Winter Weather Advisory	LSX	35 hr
Mar 8, 3:03 PM CST	Wind Advisory	LSX	33 hr
Mar 9, 2:55 PM CST	Severe Thunderstorm Warning	LSX	50 min
Mar 9, 3:17 PM CST	Mesoscale Discussion	SPC	118 min
Mar 9, 3:37 PM CST	Severe Thunderstorm Warning	LSX	38 min
Mar 10, 12:11 PM CDT	River Flood Warning	LSX	138 days
Mar 12, 11:58 AM CDT	River Flood Warning	LSX	136 days
Mar 12, 3:30 PM CDT	Wind Advisory	LSX	28 hr
Mar 13, 3:42 AM CDT	High Wind Watch	LSX	24 hr
Mar 13, 10:31 AM CDT	River Flood Warning	LSX	26 days
Mar 14, 3:33 AM CDT	High Wind Warning	LSX	18 hr
Mar 24, 1:53 PM CDT	Mesoscale Discussion	SPC	3 hr
Mar 24, 2:52 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Mar 24, 5:11 PM CDT	Mesoscale Discussion	SPC	2 hr
Mar 24, 6:28 PM CDT	Special Weather Statement	LSX	47 min
Mar 24, 6:31 PM CDT	Severe Thunderstorm Warning	LSX	43 min
Mar 24, 7:22 PM CDT	Special Weather Statement	LSX	53 min
Mar 24, 8:01 PM CDT	Mesoscale Discussion	SPC	119 min
Mar 28, 5:35 PM CDT	Special Weather Statement	LSX	40 min
Mar 28, 5:42 PM CDT	Severe Thunderstorm Warning	LSX	36 min
Mar 30, 3:26 PM CDT	River Flood Warning	LSX	15 hr
Apr 7, 3:14 PM CDT	Mesoscale Discussion	SPC	3 hr
Apr 10, 3:37 PM CDT	Wind Advisory	LSX	27 hr
Apr 14, 3:30 AM CDT	Frost Advisory	LSX	30 hr
Apr 18, 2:16 AM CDT	Mesoscale Discussion	SPC	119 min
Apr 25, 1:33 AM CDT	Dense Fog Advisory	LSX	8 hr
Apr 29, 3:28 PM CDT	Flash Flood Watch	LSX	3 days
Apr 30, 10:33 AM CDT	River Flood Warning	LSX	96 days
Apr 30, 12:39 PM CDT	Mesoscale Discussion	SPC	2 hr
Apr 30, 1:00 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Apr 30, 4:35 PM CDT	Mesoscale Discussion	SPC	55 min
Apr 30, 7:32 PM CDT	Areal Flood Advisory	LSX	3 hr
Apr 30, 10:01 PM CDT	Areal Flood Warning	LSX	24 hr
Apr 30, 10:13 PM CDT	Mesoscale Discussion	SPC	92 min
Apr 30, 11:23 PM CDT	River Flood Warning	LSX	32 hr
May 2, 12:52 PM CDT	Areal Flood Advisory	LSX	3 hr
May 2, 3:54 PM CDT	River Flood Warning	LSX	16 hr
May 6, 10:02 AM CDT	Flash Flood Warning	LSX	3 hr
May 6, 12:59 PM CDT	Areal Flood Warning	LSX	48 hr
May 8, 12:13 AM CDT	Special Weather Statement	LSX	47 min
May 18, 4:40 PM CDT	Severe Thunderstorm Watch	SPC	4 hr
May 18, 7:02 PM CDT	Special Weather Statement	LSX	58 min
May 18, 7:19 PM CDT	Mesoscale Discussion	SPC	116 min
May 21, 1:32 AM CDT	Special Weather Statement	LSX	43 min
May 21, 3:40 AM CDT	Flash Flood Watch	LSX	20 hr
May 21, 3:10 PM CDT	Tornado Watch	SPC	8 hr
May 21, 5:22 PM CDT	Severe Thunderstorm Warning	LSX	38 min
May 21, 5:40 PM CDT	Tornado Warning	LSX	50 min
May 21, 5:43 PM CDT	Mesoscale Discussion	SPC	62 min
May 21, 5:57 PM CDT	Severe Thunderstorm Warning	LSX	33 min
May 21, 6:12 PM CDT	Mesoscale Discussion	SPC	33 min
May 21, 6:19 PM CDT	Tornado Warning Tornado observed	LSX	41 min
May 21, 6:55 PM CDT	Tornado Warning	LSX	50 min
May 21, 7:37 PM CDT	Mesoscale Discussion	SPC	83 min
May 22, 9:43 PM CDT	Mesoscale Discussion	SPC	92 min
May 22, 10:26 PM CDT	Tornado Watch	SPC	8 hr
May 22, 11:55 PM CDT	Severe Thunderstorm Warning	LSX	35 min
May 23, 1:14 AM CDT	Tornado Warning	LSX	33 min
May 23, 1:23 AM CDT	Mesoscale Discussion	SPC	97 min
May 23, 1:39 AM CDT	Tornado Warning	LSX	33 min
May 23, 2:07 AM CDT	Severe Thunderstorm Warning	LSX	38 min
May 23, 2:54 AM CDT	Severe Thunderstorm Warning	LSX	51 min
May 27, 4:04 PM CDT	Areal Flood Warning	LSX	72 hr
May 29, 3:48 PM CDT	Mesoscale Discussion	SPC	87 min
May 29, 4:24 PM CDT	Special Weather Statement	LSX	51 min
May 29, 4:34 PM CDT	Severe Thunderstorm Watch	SPC	3 hr
May 29, 4:43 PM CDT	Severe Thunderstorm Warning	LSX	30 min
May 29, 5:55 PM CDT	Special Weather Statement	LSX	50 min
May 30, 1:52 PM CDT	Areal Flood Warning	LSX	7 days
Jun 1, 3:33 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 1, 6:07 PM CDT	Mesoscale Discussion	SPC	83 min
Jun 1, 7:12 PM CDT	Severe Thunderstorm Warning	LSX	63 min
Jun 1, 7:18 PM CDT	Mesoscale Discussion	SPC	57 min
Jun 1, 8:10 PM CDT	Severe Thunderstorm Warning	LSX	65 min
Jun 1, 10:13 PM CDT	Areal Flood Advisory	LSX	6 hr
Jun 3, 1:49 PM CDT	Areal Flood Warning	LSX	72 hr
Jun 4, 2:52 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 4, 4:57 PM CDT	Mesoscale Discussion	SPC	93 min
Jun 4, 5:42 PM CDT	Severe Thunderstorm Warning	LSX	48 min
Jun 5, 12:44 PM CDT	Mesoscale Discussion	SPC	2 hr
Jun 5, 2:21 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 5, 6:01 PM CDT	Mesoscale Discussion	SPC	89 min
Jun 5, 6:45 PM CDT	Severe Thunderstorm Warning	LSX	45 min
Jun 5, 6:50 PM CDT	Severe Thunderstorm Warning	LSX	40 min
Jun 5, 7:03 PM CDT	Severe Thunderstorm Warning	LSX	42 min
Jun 5, 7:18 PM CDT	Severe Thunderstorm Warning	LSX	21 min
Jun 5, 7:44 PM CDT	Mesoscale Discussion	SPC	91 min
Jun 12, 6:50 PM CDT	Special Weather Statement	LSX	40 min
Jun 12, 7:07 PM CDT	Special Weather Statement	LSX	38 min
Jun 17, 3:16 AM CDT	Flash Flood Watch	LSX	17 hr
Jun 21, 8:28 AM CDT	Severe Thunderstorm Watch	SPC	9 hr
Jun 21, 10:50 AM CDT	Mesoscale Discussion	SPC	85 min
Jun 21, 11:02 AM CDT	Severe Thunderstorm Warning	LSX	58 min
Jun 21, 11:54 AM CDT	Severe Thunderstorm Warning	LSX	66 min
Jun 21, 3:35 PM CDT	Heat Advisory	LSX	19 hr
Jun 21, 3:37 PM CDT	Flash Flood Watch	LSX	21 hr
Jun 22, 9:08 AM CDT	Areal Flood Advisory	LSX	3 hr
Jun 26, 1:06 PM CDT	Mesoscale Discussion	SPC	114 min
Jun 26, 3:17 PM CDT	Severe Thunderstorm Warning	LSX	43 min
Jun 26, 3:58 PM CDT	Severe Thunderstorm Warning	LSX	47 min
Jun 28, 11:23 AM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 28, 4:00 PM CDT	Special Weather Statement	LSX	45 min
Jun 28, 4:27 PM CDT	Severe Thunderstorm Warning	LSX	37 min
Jul 3, 4:47 PM CDT	Mesoscale Discussion	SPC	2 hr
Jul 9, 1:32 PM CDT	Heat Advisory	LSX	29 hr
Jul 10, 6:08 PM CDT	Special Weather Statement	LSX	52 min
Jul 10, 6:29 PM CDT	Severe Thunderstorm Warning	LSX	46 min
Jul 10, 7:08 PM CDT	Severe Thunderstorm Warning	LSX	52 min
Jul 10, 7:38 PM CDT	Severe Thunderstorm Warning	LSX	52 min
Jul 10, 8:10 PM CDT	Flash Flood Warning	LSX	6 hr
Jul 10, 8:27 PM CDT	Special Weather Statement	LSX	48 min
Jul 15, 4:24 PM CDT	Excessive Heat Watch	LSX	23 hr
Jul 16, 3:32 PM CDT	Excessive Heat Warning	LSX	5 days
Jul 17, 3:58 PM CDT	Mesoscale Discussion	SPC	92 min
Jul 17, 4:51 PM CDT	Severe Thunderstorm Warning	LSX	39 min
Jul 17, 5:17 PM CDT	Severe Thunderstorm Watch	SPC	4 hr
Jul 17, 5:27 PM CDT	Severe Thunderstorm Warning	LSX	48 min
Jul 17, 6:01 PM CDT	Severe Thunderstorm Warning	LSX	44 min
Jul 17, 6:17 PM CDT	Mesoscale Discussion	SPC	88 min
Jul 22, 4:24 AM CDT	Flash Flood Warning	LSX	6 hr
Jul 22, 9:58 AM CDT	Areal Flood Warning	LSX	6 hr
Aug 6, 1:08 PM CDT	Mesoscale Discussion	SPC	2 hr
Aug 6, 1:30 PM CDT	Special Weather Statement	LSX	60 min
Aug 6, 1:49 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Aug 6, 1:53 PM CDT	Severe Thunderstorm Warning	LSX	51 min
Aug 6, 3:47 PM CDT	Mesoscale Discussion	SPC	118 min
Aug 11, 3:43 AM CDT	Heat Advisory	LSX	41 hr
Aug 11, 9:17 PM CDT	Flash Flood Watch	LSX	13 hr
Aug 12, 3:15 AM CDT	Flash Flood Warning	LSX	6 hr
Aug 12, 9:10 AM CDT	Areal Flood Warning	LSX	6 hr
Aug 12, 9:25 PM CDT	Severe Thunderstorm Warning	LSX	28 min
Aug 12, 10:00 PM CDT	Mesoscale Discussion	SPC	2 hr
Aug 13, 1:19 AM CDT	Severe Thunderstorm Warning	LSX	41 min
Aug 13, 1:46 AM CDT	Severe Thunderstorm Warning	LSX	44 min
Aug 17, 6:15 AM CDT	Special Weather Statement	LSX	45 min
Aug 17, 7:01 AM CDT	Severe Thunderstorm Warning	LSX	29 min
Aug 19, 10:01 AM CDT	Heat Advisory	LSX	10 hr
Aug 20, 6:18 AM CDT	Severe Thunderstorm Watch	SPC	11 hr
Aug 20, 9:04 AM CDT	Mesoscale Discussion	SPC	86 min
Aug 20, 10:31 AM CDT	River Flood Warning	LSX	58 hr
Aug 21, 3:06 PM CDT	Flash Flood Watch	LSX	19 hr
Aug 21, 9:49 PM CDT	Special Weather Statement	LSX	41 min
Aug 21, 9:53 PM CDT	Flash Flood Warning	LSX	8 hr
Aug 26, 2:06 AM CDT	Mesoscale Discussion	SPC	114 min
Aug 26, 5:33 AM CDT	Areal Flood Advisory	LSX	3 hr
Aug 26, 6:21 AM CDT	Flash Flood Warning	LSX	4 hr
Aug 26, 10:48 AM CDT	River Flood Warning	LSX	10 days
Aug 30, 3:26 PM CDT	Severe Thunderstorm Warning	LSX	49 min
Aug 30, 3:44 PM CDT	Severe Thunderstorm Watch	SPC	4 hr
Aug 30, 4:37 PM CDT	Tornado Warning	LSX	38 min
Aug 30, 5:14 PM CDT	Severe Thunderstorm Warning	LSX	46 min
Sep 1, 9:41 PM CDT	Dense Fog Advisory	LSX	12 hr
Sep 8, 6:46 AM CDT	Severe Thunderstorm Warning	LSX	44 min
Sep 8, 7:28 AM CDT	Special Weather Statement	LSX	47 min
Sep 10, 3:12 AM CDT	Heat Advisory	LSX	64 hr
Sep 29, 11:03 AM CDT	River Flood Warning	LSX	17 days
Sep 29, 11:26 AM CDT	River Flood Warning	LSX	44 days
Sep 29, 11:26 AM CDT	River Flood Warning	LSX	28 days
Oct 11, 2:42 PM CDT	Frost Advisory	LSX	17 hr
Oct 27, 1:54 AM CDT	Dense Fog Advisory	LSX	8 hr
Oct 30, 3:23 AM CDT	Freeze Warning	LSX	31 hr
Oct 30, 9:49 AM CDT	River Flood Warning	LSX	4 days
Nov 10, 2:57 PM CST	Winter Weather Advisory	LSX	28 hr
Nov 26, 3:22 AM CST	Wind Advisory	LSX	33 hr
Nov 26, 1:04 PM CST	High Wind Warning	LSX	23 hr
Nov 26, 6:03 PM CST	Mesoscale Discussion	SPC	57 min
Nov 26, 6:20 PM CST	Tornado Watch	SPC	6 hr
Nov 30, 2:23 PM CST	Wind Advisory	LSX	28 hr
Dec 14, 3:54 AM CST	Winter Storm Watch	LSX	24 hr
Dec 15, 3:35 AM CST	Winter Storm Warning	LSX	44 hr
Dec 15, 10:05 AM CST	Mesoscale Discussion	SPC	4 hr
Dec 15, 2:11 PM CST	Mesoscale Discussion	SPC	4 hr
Dec 16, 10:36 AM CST	Mesoscale Discussion	SPC	4 hr
Dec 28, 4:30 AM CST	Dense Fog Advisory	LSX	7 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	36
Tornado Warning	6
Severe Thunderstorm Watch	13
Tornado Watch	3
Mesoscale Discussion	39
Special Weather Statement	17
Flooding
Areal Flood Warning	7
Flash Flood Warning	6
River Flood Warning	16
Flash Flood Watch	6
Areal Flood Advisory	6
Winter
Winter Storm Warning	2
Winter Storm Watch	3
Winter Weather Advisory	10
Heat
Excessive Heat Warning	1
Excessive Heat Watch	1
Heat Advisory	5
Cold
Freeze Warning	1
Wind Chill Warning	1
Wind Chill Watch	1
Frost Advisory	2
Wind Chill Advisory	1
Wind and dust
High Wind Warning	2
High Wind Watch	1
Wind Advisory	6
Fog and smoke
Dense Fog Advisory	8

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2018 2020

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.