Alert archive / Missouri / Washington County

Weather alerts in Washington County, Missouri, 2011

193 weather alerts in 2011, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Washington County and its neighbors

Each county as a circle sized by its count in 2011. Tap one for its archive.

Alerts: 193
Warnings: 78
Watches: 44
Advisories: 21
Busiest month: June54 alerts
Busiest day: June 26, 201118 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 10 tornado warnings covering Washington County in 2011 had a tornado report inside them.

Washington County, 2011

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	10	1	90%	0
Severe thunderstorm warnings	40	22	45%	23	61%	14 min
Flash flood warnings	13	8	38%	2	100%	111 min

Each office's whole area, 2011

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS St. Louis, MO: tornado warnings	135	21	84%	56	80%	23 min
NWS St. Louis, MO: severe thunderstorm warnings	511	237	54%	1,031	66%	23 min
NWS St. Louis, MO: flash flood warnings	80	34	57%	84	83%	150 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 10, 3:27 AM CST	Winter Weather Advisory	LSX	39 hr
Jan 18, 3:33 PM CST	Winter Weather Advisory	LSX	48 hr
Jan 22, 4:11 AM CST	Winter Weather Advisory	LSX	34 hr
Jan 23, 10:21 PM CST	Winter Weather Advisory	LSX	11 hr
Jan 29, 8:30 PM CST	Winter Storm Watch	LSX	19 hr
Jan 30, 3:56 PM CST	Winter Storm Warning	LSX	60 hr
Feb 1, 6:54 AM CST	Mesoscale Discussion	SPC	5 hr
Feb 1, 11:42 AM CST	Mesoscale Discussion	SPC	5 hr
Feb 4, 3:55 PM CST	Winter Weather Advisory	LSX	19 hr
Feb 24, 7:36 PM CST	Areal Flood Warning	LSX	12 hr
Feb 27, 4:57 PM CST	Mesoscale Discussion	SPC	2 hr
Feb 27, 9:40 PM CST	Tornado Watch	SPC	6 hr
Feb 27, 10:41 PM CST	Mesoscale Discussion	SPC	94 min
Feb 28, 12:06 AM CST	Severe Thunderstorm Warning	LSX	39 min
Mar 3, 3:42 PM CST	Flash Flood Watch	LSX	36 hr
Mar 4, 1:33 PM CST	Severe Thunderstorm Watch	SPC	5 hr
Mar 4, 4:54 PM CST	Tornado Watch	SPC	118 min
Mar 4, 6:22 PM CST	Mesoscale Discussion	SPC	53 min
Mar 4, 6:50 PM CST	Severe Thunderstorm Watch	SPC	7 hr
Mar 25, 3:26 PM CDT	Winter Weather Advisory	LSX	31 hr
Mar 27, 4:27 AM CDT	Freeze Warning	LSX	24 hr
Apr 2, 4:05 AM CDT	Wind Advisory	LSX	40 hr
Apr 4, 1:29 AM CDT	Mesoscale Discussion	SPC	91 min
Apr 4, 3:58 PM CDT	Freeze Warning	LSX	16 hr
Apr 6, 5:34 AM CDT	Red Flag Warning	LSX	13 hr
Apr 10, 7:28 PM CDT	Tornado Watch	SPC	8 hr
Apr 15, 12:29 PM CDT	Mesoscale Discussion	SPC	61 min
Apr 15, 12:47 PM CDT	Tornado Watch	SPC	9 hr
Apr 19, 3:11 AM CDT	Severe Thunderstorm Watch	SPC	7 hr
Apr 19, 4:58 AM CDT	Severe Thunderstorm Warning	LSX	32 min
Apr 19, 5:23 AM CDT	Severe Thunderstorm Warning	LSX	37 min
Apr 19, 5:43 AM CDT	Severe Thunderstorm Warning	LSX	47 min
Apr 19, 1:00 PM CDT	Tornado Watch	SPC	10 hr
Apr 19, 5:47 PM CDT	Mesoscale Discussion	SPC	88 min
Apr 19, 6:37 PM CDT	Severe Thunderstorm Warning	LSX	53 min
Apr 19, 7:03 PM CDT	Severe Thunderstorm Warning	LSX	42 min
Apr 19, 7:39 PM CDT	Tornado Warning	LSX	33 min
Apr 19, 8:07 PM CDT	Mesoscale Discussion	SPC	83 min
Apr 21, 3:45 PM CDT	Flash Flood Watch	LSX	6 days
Apr 22, 7:28 AM CDT	Flash Flood Warning	LSX	6 hr
Apr 22, 10:09 AM CDT	Mesoscale Discussion	SPC	66 min
Apr 22, 10:44 AM CDT	Mesoscale Discussion	SPC	61 min
Apr 22, 11:00 AM CDT	Severe Thunderstorm Warning	LSX	45 min
Apr 22, 1:04 PM CDT	Mesoscale Discussion	SPC	116 min
Apr 22, 3:34 PM CDT	Tornado Watch	SPC	6 hr
Apr 22, 5:21 PM CDT	Mesoscale Discussion	SPC	114 min
Apr 22, 10:55 PM CDT	Flash Flood Warning	LSX	6 hr
Apr 23, 1:04 AM CDT	Tornado Watch	SPC	4 hr
Apr 23, 4:23 AM CDT	Flash Flood Warning	LSX	8 hr
Apr 23, 12:29 PM CDT	Flash Flood Warning	LSX	6 hr
Apr 23, 5:27 PM CDT	Severe Thunderstorm Warning	LSX	48 min
Apr 23, 5:41 PM CDT	Severe Thunderstorm Warning	LSX	33 min
Apr 23, 6:22 PM CDT	Flash Flood Warning	LSX	6 hr
Apr 23, 8:31 PM CDT	River Flood Warning	LSX	7 days
Apr 23, 10:22 PM CDT	Severe Thunderstorm Warning	LSX	43 min
Apr 24, 12:08 AM CDT	Flash Flood Warning	LSX	12 hr
Apr 24, 12:00 PM CDT	Flash Flood Warning	LSX	6 hr
Apr 24, 5:57 PM CDT	Flash Flood Warning	LSX	18 hr
Apr 25, 11:30 AM CDT	Flash Flood Warning	LSX	8 hr
Apr 25, 7:23 PM CDT	Flash Flood Warning	LSX	9 hr
Apr 26, 4:50 AM CDT	Areal Flood Warning	LSX	30 hr
Apr 27, 11:07 AM CDT	Areal Flood Warning	LSX	24 hr
Apr 28, 11:00 AM CDT	Areal Flood Warning	LSX	24 hr
Apr 28, 12:38 PM CDT	Mesoscale Discussion	SPC	97 min
Apr 29, 10:59 AM CDT	Areal Flood Warning	LSX	24 hr
May 1, 4:30 AM CDT	Flash Flood Watch	LSX	42 hr
May 1, 9:46 PM CDT	Areal Flood Advisory	LSX	12 hr
May 3, 3:36 AM CDT	Frost Advisory	LSX	28 hr
May 7, 3:40 AM CDT	Mesoscale Discussion	SPC	95 min
May 12, 5:31 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
May 12, 10:09 PM CDT	Mesoscale Discussion	SPC	66 min
May 12, 10:50 PM CDT	Severe Thunderstorm Warning	LSX	40 min
May 13, 2:04 PM CDT	Severe Thunderstorm Warning	LSX	41 min
May 13, 2:39 PM CDT	Severe Thunderstorm Warning	LSX	51 min
May 22, 12:51 PM CDT	Tornado Watch	SPC	10 hr
May 22, 7:52 PM CDT	Mesoscale Discussion	SPC	53 min
May 22, 8:26 PM CDT	Tornado Watch	SPC	8 hr
May 23, 10:34 AM CDT	Mesoscale Discussion	SPC	86 min
May 23, 10:55 AM CDT	Severe Thunderstorm Watch	SPC	7 hr
May 23, 10:56 AM CDT	Severe Thunderstorm Warning	LSX	64 min
May 23, 11:41 AM CDT	Severe Thunderstorm Warning	LSX	49 min
May 24, 3:44 PM CDT	Flash Flood Watch	LSX	32 hr
May 25, 12:48 AM CDT	Mesoscale Discussion	SPC	57 min
May 25, 1:22 AM CDT	Tornado Watch	SPC	7 hr
May 25, 4:58 AM CDT	Mesoscale Discussion	SPC	92 min
May 25, 10:18 AM CDT	Mesoscale Discussion	SPC	57 min
May 25, 11:02 AM CDT	Mesoscale Discussion	SPC	28 min
May 25, 11:09 AM CDT	Tornado Watch PDS	SPC	10 hr
May 25, 2:43 PM CDT	Tornado Warning	LSX	18 min
May 25, 3:19 PM CDT	Tornado Warning	LSX	41 min
May 25, 3:32 PM CDT	Tornado Warning	LSX	43 min
May 25, 3:41 PM CDT	Tornado Warning	LSX	37 min
May 25, 4:14 PM CDT	Tornado Warning	LSX	46 min
May 25, 4:51 PM CDT	Tornado Warning	LSX	39 min
May 28, 8:51 AM CDT	Severe Thunderstorm Warning	LSX	39 min
Jun 10, 4:57 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 10, 10:56 PM CDT	Mesoscale Discussion	SPC	94 min
Jun 13, 5:16 AM CDT	Severe Thunderstorm Watch	SPC	8 hr
Jun 13, 6:52 AM CDT	Mesoscale Discussion	SPC	83 min
Jun 13, 7:33 AM CDT	Severe Thunderstorm Warning	LSX	42 min
Jun 13, 8:27 AM CDT	Severe Thunderstorm Warning	LSX	48 min
Jun 13, 10:04 AM CDT	Mesoscale Discussion	SPC	86 min
Jun 13, 4:02 PM CDT	Flash Flood Watch	LSX	39 hr
Jun 15, 12:29 AM CDT	Mesoscale Discussion	SPC	2 hr
Jun 15, 1:09 AM CDT	Severe Thunderstorm Watch	SPC	4 hr
Jun 15, 4:24 AM CDT	Mesoscale Discussion	SPC	96 min
Jun 16, 12:28 PM CDT	Severe Thunderstorm Warning	LSX	30 min
Jun 16, 1:07 PM CDT	Severe Thunderstorm Warning	LSX	30 min
Jun 18, 2:44 AM CDT	Severe Thunderstorm Watch	SPC	5 hr
Jun 18, 5:39 AM CDT	Mesoscale Discussion	SPC	66 min
Jun 18, 3:57 PM CDT	Flash Flood Watch	LSX	15 hr
Jun 18, 7:41 PM CDT	Mesoscale Discussion	SPC	94 min
Jun 18, 8:26 PM CDT	Severe Thunderstorm Watch	SPC	8 hr
Jun 18, 11:05 PM CDT	Mesoscale Discussion	SPC	85 min
Jun 19, 1:51 AM CDT	Severe Thunderstorm Warning	LSX	39 min
Jun 19, 2:14 AM CDT	Mesoscale Discussion	SPC	61 min
Jun 19, 2:25 AM CDT	Severe Thunderstorm Warning	LSX	50 min
Jun 19, 2:28 AM CDT	Tornado Warning	LSX	47 min
Jun 21, 12:56 PM CDT	Mesoscale Discussion	SPC	64 min
Jun 21, 1:22 PM CDT	Tornado Watch	SPC	9 hr
Jun 21, 2:07 PM CDT	Severe Thunderstorm Warning	LSX	53 min
Jun 21, 3:31 PM CDT	Mesoscale Discussion	SPC	89 min
Jun 25, 3:51 AM CDT	Mesoscale Discussion	SPC	84 min
Jun 25, 11:17 AM CDT	Mesoscale Discussion	SPC	118 min
Jun 25, 1:06 PM CDT	Severe Thunderstorm Watch	SPC	3 hr
Jun 25, 2:59 PM CDT	Mesoscale Discussion	SPC	91 min
Jun 25, 7:07 PM CDT	Mesoscale Discussion	SPC	113 min
Jun 25, 7:26 PM CDT	Severe Thunderstorm Warning	LSX	49 min
Jun 25, 7:36 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 25, 7:45 PM CDT	Tornado Warning	LSX	45 min
Jun 25, 8:03 PM CDT	Severe Thunderstorm Warning	LSX	42 min
Jun 25, 8:42 PM CDT	Severe Thunderstorm Warning	LSX	48 min
Jun 25, 8:52 PM CDT	Severe Thunderstorm Warning	LSX	38 min
Jun 25, 10:01 PM CDT	Areal Flood Advisory	LSX	6 hr
Jun 25, 10:47 PM CDT	Severe Thunderstorm Warning	LSX	43 min
Jun 25, 11:00 PM CDT	Tornado Warning	LSX	45 min
Jun 25, 11:08 PM CDT	Severe Thunderstorm Warning	LSX	22 min
Jun 26, 1:58 AM CDT	Severe Thunderstorm Watch	SPC	4 hr
Jun 26, 2:24 PM CDT	Severe Thunderstorm Watch	SPC	5 hr
Jun 26, 2:43 PM CDT	Flash Flood Watch	LSX	31 hr
Jun 26, 4:16 PM CDT	Severe Thunderstorm Warning	LSX	29 min
Jun 26, 4:40 PM CDT	Severe Thunderstorm Warning	LSX	38 min
Jun 26, 4:54 PM CDT	Flash Flood Warning	LSX	6 hr
Jun 26, 6:55 PM CDT	Tornado Watch	SPC	7 hr
Jun 27, 12:58 AM CDT	Mesoscale Discussion	SPC	92 min
Jun 27, 1:32 AM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 27, 2:17 AM CDT	Severe Thunderstorm Warning	LSX	43 min
Jun 27, 3:01 AM CDT	Severe Thunderstorm Warning	LSX	29 min
Jun 29, 4:09 PM CDT	Heat Advisory	LSX	4 days
Jul 3, 1:15 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jul 3, 1:29 PM CDT	Severe Thunderstorm Warning	LSX	46 min
Jul 3, 3:35 PM CDT	Mesoscale Discussion	SPC	55 min
Jul 3, 5:19 PM CDT	Mesoscale Discussion	SPC	26 min
Jul 6, 1:38 PM CDT	Mesoscale Discussion	SPC	97 min
Jul 7, 5:03 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 7, 5:24 PM CDT	Severe Thunderstorm Warning	LSX	24 min
Jul 7, 6:29 PM CDT	Flash Flood Warning	LSX	6 hr
Jul 7, 7:58 PM CDT	Mesoscale Discussion	SPC	92 min
Jul 8, 3:17 PM CDT	Heat Advisory	LSX	4 days
Jul 10, 11:54 AM CDT	Excessive Heat Warning	LSX	55 hr
Jul 12, 7:01 PM CDT	Severe Thunderstorm Warning	LSX	44 min
Jul 13, 1:25 AM CDT	Flash Flood Warning	LSX	8 hr
Jul 14, 3:29 PM CDT	Excessive Heat Watch	LSX	23 hr
Jul 15, 2:23 PM CDT	Excessive Heat Warning	LSX	19 days
Jul 30, 12:35 PM CDT	Mesoscale Discussion	SPC	85 min
Aug 4, 2:10 AM CDT	Mesoscale Discussion	SPC	80 min
Aug 4, 6:04 AM CDT	Mesoscale Discussion	SPC	86 min
Aug 4, 8:06 AM CDT	Severe Thunderstorm Watch	SPC	4 hr
Aug 5, 4:10 AM CDT	Heat Advisory	LSX	63 hr
Aug 7, 5:20 PM CDT	Mesoscale Discussion	SPC	115 min
Aug 7, 5:41 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Aug 7, 7:25 PM CDT	Severe Thunderstorm Warning	LSX	50 min
Aug 7, 7:54 PM CDT	Severe Thunderstorm Warning	LSX	18 min
Aug 7, 8:27 PM CDT	Mesoscale Discussion	SPC	2 hr
Aug 12, 1:44 PM CDT	Mesoscale Discussion	SPC	91 min
Aug 12, 4:44 PM CDT	Severe Thunderstorm Warning	LSX	46 min
Aug 19, 1:08 AM CDT	Severe Thunderstorm Watch	SPC	4 hr
Aug 19, 4:08 AM CDT	Mesoscale Discussion	SPC	67 min
Aug 20, 6:36 AM CDT	Severe Thunderstorm Warning	LSX	54 min
Aug 23, 3:35 AM CDT	Heat Advisory	LSX	39 hr
Sep 19, 11:52 PM CDT	Dense Fog Advisory	LSX	9 hr
Sep 22, 11:52 PM CDT	Dense Fog Advisory	LSX	10 hr
Oct 1, 2:25 PM CDT	Frost Advisory	LSX	18 hr
Oct 14, 4:05 PM CDT	Fire Weather Watch	LSX	36 hr
Oct 20, 3:48 AM CDT	Frost Advisory	LSX	29 hr
Oct 27, 3:55 AM CDT	Frost Advisory	LSX	28 hr
Nov 5, 6:12 AM CDT	Dense Fog Advisory	LSX	5 hr
Nov 8, 1:17 AM CST	Mesoscale Discussion	SPC	118 min
Nov 9, 3:03 PM CST	Freeze Warning	LSX	15 hr
Nov 10, 3:09 PM CST	Freeze Warning	LSX	17 hr
Nov 18, 4:29 AM CST	Red Flag Warning	LSX	13 hr
Nov 21, 3:22 AM CST	Flash Flood Watch	LSX	24 hr
Dec 20, 10:59 PM 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	40
Tornado Warning	10
Severe Thunderstorm Watch	20
Tornado Watch	13
Mesoscale Discussion	50
Flooding
Areal Flood Warning	5
Flash Flood Warning	13
River Flood Warning	1
Flash Flood Watch	8
Areal Flood Advisory	2
Winter
Winter Storm Warning	1
Winter Storm Watch	1
Winter Weather Advisory	6
Heat
Excessive Heat Warning	2
Excessive Heat Watch	1
Heat Advisory	4
Cold
Freeze Warning	4
Frost Advisory	4
Wind and dust
Wind Advisory	1
Fire
Red Flag Warning	2
Fire Weather Watch	1
Fog and smoke
Dense Fog Advisory	4

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2010 2012

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.