Alert archive / Missouri / Jefferson County

Weather alerts in Jefferson County, Missouri, 2008

221 weather alerts in 2008, 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 2008. Tap one for its archive.

Alerts: 221
Warnings: 87
Watches: 50
Advisories: 28
Busiest month: June35 alerts
Busiest day: June 6, 200811 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 8 tornado warnings covering Jefferson County in 2008 had a tornado report inside them.

Jefferson County, 2008

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	8	2	75%	0
Severe thunderstorm warnings	36	19	47%	11	82%	21 min
Flash flood warnings	8	4	50%	1	0%

Each office's whole area, 2008

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS St. Louis, MO: tornado warnings	98	15	85%	34	65%	23 min
NWS St. Louis, MO: severe thunderstorm warnings	467	151	68%	450	74%	23 min
NWS St. Louis, MO: flash flood warnings	100	35	65%	145	77%	155 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, 4:34 PM CST	Mesoscale Discussion	SPC	86 min
Jan 7, 6:57 PM CST	Mesoscale Discussion	SPC	93 min
Jan 7, 7:48 PM CST	Tornado Watch PDS	SPC	9 hr
Jan 8, 1:10 AM CST	Severe Thunderstorm Warning	LSX	50 min
Jan 21, 4:12 PM CST	Winter Weather Advisory	LSX	12 hr
Jan 27, 2:59 PM CST	Wind Advisory	LSX	29 hr
Jan 28, 8:10 PM CST	Wind Advisory	LSX	25 hr
Jan 29, 11:32 AM CST	Tornado Watch	SPC	7 hr
Jan 30, 4:18 AM CST	Winter Storm Watch	LSX	24 hr
Jan 31, 4:21 AM CST	Winter Storm Warning	LSX	32 hr
Jan 31, 6:23 PM CST	Mesoscale Discussion	SPC	3 hr
Feb 3, 8:50 PM CST	Dense Fog Advisory	LSX	15 hr
Feb 4, 3:32 PM CST	Flash Flood Watch	LSX	31 hr
Feb 4, 6:20 PM CST	Mesoscale Discussion	SPC	85 min
Feb 4, 7:14 PM CST	Severe Thunderstorm Watch	SPC	6 hr
Feb 5, 4:30 PM CST	Severe Thunderstorm Warning	LSX	29 min
Feb 5, 4:46 PM CST	Mesoscale Discussion	SPC	119 min
Feb 5, 6:13 PM CST	Flash Flood Warning	LSX	5 hr
Feb 10, 4:09 AM CST	Winter Storm Watch	LSX	24 hr
Feb 10, 9:55 PM CST	Winter Storm Warning	LSX	32 hr
Feb 11, 4:37 AM CST	Winter Weather Advisory	LSX	18 hr
Feb 11, 1:10 PM CST	Mesoscale Discussion	SPC	6 hr
Feb 15, 3:10 PM CST	Flash Flood Watch	LSX	45 hr
Feb 17, 11:54 AM CST	Wind Advisory	LSX	6 hr
Feb 19, 3:48 PM CST	Winter Storm Watch	LSX	30 hr
Feb 20, 4:31 PM CST	Winter Storm Warning	LSX	47 hr
Feb 21, 6:15 AM CST	Mesoscale Discussion	SPC	6 hr
Feb 21, 12:04 PM CST	Mesoscale Discussion	SPC	4 hr
Feb 23, 8:11 PM CST	Winter Weather Advisory	LSX	10 hr
Feb 25, 3:21 PM CST	Snow and Blowing Snow Advisory	LSX	13 hr
Mar 2, 4:06 AM CST	Flood Watch	LSX	35 hr
Mar 2, 4:30 AM CST	Winter Storm Watch	LSX	24 hr
Mar 3, 4:21 AM CST	Winter Storm Warning	LSX	38 hr
Mar 3, 2:04 PM CST	Mesoscale Discussion	SPC	5 hr
Mar 4, 9:26 PM CST	River Flood Warning	LSX	60 hr
Mar 16, 3:10 PM CDT	Flood Watch	LSX	64 hr
Mar 17, 9:02 AM CDT	Severe Thunderstorm Warning	LSX	32 min
Mar 17, 11:36 PM CDT	Flash Flood Warning	LSX	6 hr
Mar 18, 5:20 AM CDT	River Flood Warning	LSX	5 days
Mar 18, 11:31 AM CDT	River Flood Warning	LSX	5 days
Mar 18, 11:31 AM CDT	River Flood Warning	LSX	6 days
Mar 18, 11:31 AM CDT	River Flood Warning	LSX	6 days
Mar 18, 11:31 AM CDT	River Flood Warning	LSX	8 days
Mar 18, 11:54 AM CDT	Mesoscale Discussion	SPC	3 hr
Mar 26, 10:04 AM CDT	Mesoscale Discussion	SPC	116 min
Mar 26, 1:48 PM CDT	Mesoscale Discussion	SPC	2 hr
Mar 26, 2:41 PM CDT	Severe Thunderstorm Warning	LSX	49 min
Mar 26, 4:18 PM CDT	Severe Thunderstorm Warning	LSX	42 min
Mar 27, 4:39 AM CDT	Mesoscale Discussion	SPC	96 min
Mar 27, 12:29 PM CDT	Mesoscale Discussion	SPC	2 hr
Mar 27, 6:47 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Mar 27, 7:32 PM CDT	Mesoscale Discussion	SPC	88 min
Mar 27, 9:31 PM CDT	Mesoscale Discussion	SPC	89 min
Mar 30, 4:07 PM CDT	Flash Flood Watch	LSX	31 hr
Mar 31, 11:29 AM CDT	River Flood Warning	LSX	4 days
Mar 31, 11:29 AM CDT	River Flood Warning	LSX	5 days
Mar 31, 11:29 AM CDT	River Flood Warning	LSX	6 days
Mar 31, 11:29 AM CDT	River Flood Warning	LSX	6 days
Mar 31, 12:11 PM CDT	River Flood Warning	LSX	4 days
Mar 31, 1:10 PM CDT	Mesoscale Discussion	SPC	35 min
Mar 31, 1:45 PM CDT	Tornado Watch	SPC	6 hr
Mar 31, 4:25 PM CDT	Severe Thunderstorm Warning	LSX	50 min
Mar 31, 4:43 PM CDT	Severe Thunderstorm Warning	LSX	32 min
Apr 1, 4:17 PM CDT	Flash Flood Watch	LSX	60 hr
Apr 7, 3:03 PM CDT	Flash Flood Watch	LSX	24 hr
Apr 8, 5:03 PM CDT	Mesoscale Discussion	SPC	57 min
Apr 9, 4:15 AM CDT	Flash Flood Watch	LSX	41 hr
Apr 9, 9:43 PM CDT	River Flood Warning	LSX	4 days
Apr 9, 9:43 PM CDT	River Flood Warning	LSX	5 days
Apr 9, 9:43 PM CDT	River Flood Warning	LSX	6 days
Apr 9, 9:43 PM CDT	River Flood Warning	LSX	41 days
Apr 9, 9:49 PM CDT	River Flood Warning	LSX	3 days
Apr 10, 5:10 AM CDT	Flash Flood Warning	LSX	6 hr
Apr 11, 9:32 AM CDT	Wind Advisory	LSX	4 hr
Apr 11, 2:22 PM CDT	Wind Advisory	LSX	5 hr
Apr 22, 8:55 AM CDT	Severe Thunderstorm Warning	LSX	50 min
Apr 25, 1:27 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Apr 25, 6:34 PM CDT	Severe Thunderstorm Warning	LSX	41 min
Apr 25, 6:57 PM CDT	Severe Thunderstorm Warning	LSX	48 min
Apr 28, 3:16 AM CDT	Frost Advisory	LSX	29 hr
May 2, 5:00 AM CDT	Severe Thunderstorm Watch	SPC	5 hr
May 7, 5:12 AM CDT	Flash Flood Watch	LSX	23 hr
May 7, 9:24 PM CDT	Areal Flood Advisory	LSX	6 hr
May 8, 3:31 AM CDT	Areal Flood Advisory	LSX	6 hr
May 8, 9:42 AM CDT	Areal Flood Advisory	LSX	6 hr
May 9, 8:58 AM CDT	River Flood Warning	LSX	60 hr
May 10, 12:34 PM CDT	Mesoscale Discussion	SPC	116 min
May 10, 3:30 PM CDT	Wind Advisory	LSX	28 hr
May 10, 7:14 PM CDT	Severe Thunderstorm Watch	SPC	5 hr
May 10, 8:50 PM CDT	Mesoscale Discussion	SPC	85 min
May 13, 6:07 AM CDT	Mesoscale Discussion	SPC	83 min
May 13, 6:29 AM CDT	Severe Thunderstorm Warning	LSX	46 min
May 13, 7:16 AM CDT	Severe Thunderstorm Warning	LSX	18 min
May 13, 7:59 AM CDT	Severe Thunderstorm Warning	LSX	31 min
May 13, 7:11 PM CDT	Mesoscale Discussion	SPC	2 hr
May 13, 10:38 PM CDT	Mesoscale Discussion	SPC	97 min
May 25, 12:53 PM CDT	Mesoscale Discussion	SPC	67 min
May 25, 2:37 PM CDT	Severe Thunderstorm Warning	LSX	53 min
May 25, 3:18 PM CDT	Severe Thunderstorm Warning	LSX	42 min
May 25, 3:57 PM CDT	Flash Flood Watch	LSX	71 hr
May 25, 3:58 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
May 25, 6:39 PM CDT	Mesoscale Discussion	SPC	66 min
May 25, 7:38 PM CDT	Severe Thunderstorm Warning	LSX	52 min
May 25, 9:03 PM CDT	Severe Thunderstorm Warning	LSX	42 min
May 25, 9:30 PM CDT	Severe Thunderstorm Watch	SPC	4 hr
May 26, 5:11 PM CDT	River Flood Warning	LSX	52 hr
May 30, 1:56 PM CDT	Tornado Watch	SPC	8 hr
May 30, 9:16 PM CDT	Mesoscale Discussion	SPC	29 min
May 30, 9:49 PM CDT	Severe Thunderstorm Warning	LSX	41 min
May 30, 9:58 PM CDT	Severe Thunderstorm Watch	SPC	5 hr
May 30, 11:35 PM CDT	Mesoscale Discussion	SPC	55 min
Jun 3, 11:17 AM CDT	River Flood Warning	LSX	41 days
Jun 3, 3:35 PM CDT	Flash Flood Watch	LSX	24 hr
Jun 4, 1:29 AM CDT	Mesoscale Discussion	SPC	91 min
Jun 4, 2:06 AM CDT	Tornado Watch	SPC	5 hr
Jun 4, 2:55 AM CDT	Severe Thunderstorm Warning	LSX	50 min
Jun 6, 5:14 AM CDT	Mesoscale Discussion	SPC	61 min
Jun 6, 10:50 AM CDT	Mesoscale Discussion	SPC	85 min
Jun 6, 12:13 PM CDT	Tornado Watch	SPC	9 hr
Jun 6, 1:15 PM CDT	Severe Thunderstorm Warning	LSX	45 min
Jun 6, 1:47 PM CDT	Tornado Warning	LSX	43 min
Jun 6, 2:21 PM CDT	Tornado Warning	LSX	39 min
Jun 6, 2:27 PM CDT	Mesoscale Discussion	SPC	93 min
Jun 6, 2:30 PM CDT	Tornado Warning	LSX	45 min
Jun 6, 2:37 PM CDT	Flash Flood Warning	LSX	4 hr
Jun 6, 3:12 PM CDT	Tornado Warning	LSX	48 min
Jun 6, 3:52 PM CDT	Flash Flood Warning	LSX	4 hr
Jun 6, 7:04 PM CDT	Tornado Warning	LSX	20 min
Jun 6, 7:21 PM CDT	Flash Flood Warning	LSX	3 hr
Jun 8, 3:50 AM CDT	Flash Flood Watch	LSX	41 hr
Jun 12, 3:37 PM CDT	Flash Flood Watch	LSX	24 hr
Jun 14, 4:12 AM CDT	Dense Fog Advisory	LSX	5 hr
Jun 14, 9:26 PM CDT	River Flood Warning	LSX	5 days
Jun 15, 11:42 AM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 16, 5:04 AM CDT	Severe Thunderstorm Warning	LSX	41 min
Jun 21, 3:01 PM CDT	Mesoscale Discussion	SPC	89 min
Jun 21, 3:21 PM CDT	Severe Thunderstorm Warning	LSX	39 min
Jun 21, 3:54 PM CDT	Severe Thunderstorm Warning	LSX	51 min
Jun 22, 4:58 PM CDT	Severe Thunderstorm Warning	LSX	77 min
Jun 25, 8:39 PM CDT	River Flood Warning	LSX	10 days
Jun 26, 1:23 AM CDT	Mesoscale Discussion	SPC	97 min
Jun 27, 11:55 AM CDT	Mesoscale Discussion	SPC	3 hr
Jun 27, 12:30 PM CDT	Severe Thunderstorm Watch	SPC	8 hr
Jun 27, 3:04 PM CDT	Mesoscale Discussion	SPC	86 min
Jun 27, 11:26 PM CDT	Mesoscale Discussion	SPC	94 min
Jun 27, 11:42 PM CDT	Severe Thunderstorm Watch	SPC	9 hr
Jul 2, 7:15 PM CDT	Severe Thunderstorm Warning	LSX	45 min
Jul 2, 9:55 PM CDT	Flash Flood Watch	LSX	16 hr
Jul 8, 1:45 PM CDT	Flash Flood Watch	LSX	14 hr
Jul 21, 9:14 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jul 21, 10:38 PM CDT	Mesoscale Discussion	SPC	97 min
Jul 22, 4:47 AM CDT	Mesoscale Discussion	SPC	88 min
Jul 24, 11:32 PM CDT	Mesoscale Discussion	SPC	88 min
Jul 25, 6:10 PM CDT	Mesoscale Discussion	SPC	95 min
Jul 25, 6:38 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jul 27, 4:47 PM CDT	Mesoscale Discussion	SPC	88 min
Jul 27, 5:27 PM CDT	Severe Thunderstorm Watch	SPC	10 hr
Jul 27, 10:15 PM CDT	Severe Thunderstorm Warning	LSX	45 min
Jul 28, 1:23 AM CDT	Mesoscale Discussion	SPC	97 min
Jul 28, 10:28 AM CDT	River Flood Warning	LSX	8 days
Jul 29, 1:53 PM CDT	Heat Advisory	LSX	5 hr
Jul 30, 4:24 PM CDT	Tornado Warning	LSX	51 min
Jul 30, 5:21 PM CDT	Tornado Watch	SPC	5 hr
Jul 30, 7:33 PM CDT	Mesoscale Discussion	SPC	87 min
Aug 1, 3:42 AM CDT	Dense Fog Advisory	LSX	4 hr
Aug 3, 4:07 AM CDT	Excessive Heat Warning	LSX	63 hr
Aug 3, 4:07 AM CDT	Heat Advisory	LSX	63 hr
Aug 5, 2:59 PM CDT	Severe Thunderstorm Watch	SPC	9 hr
Aug 5, 6:05 PM CDT	Severe Thunderstorm Warning	LSX	55 min
Aug 5, 6:44 PM CDT	Severe Thunderstorm Warning	LSX	61 min
Aug 5, 7:31 PM CDT	Severe Thunderstorm Warning	LSX	59 min
Aug 5, 7:47 PM CDT	Severe Thunderstorm Warning	LSX	13 min
Aug 5, 7:56 PM CDT	Severe Thunderstorm Warning	LSX	64 min
Aug 5, 7:56 PM CDT	Mesoscale Discussion	SPC	2 hr
Aug 5, 8:18 PM CDT	Severe Thunderstorm Warning	LSX	42 min
Aug 5, 8:42 PM CDT	Flash Flood Warning	LSX	6 hr
Aug 14, 3:29 PM CDT	Mesoscale Discussion	SPC	91 min
Aug 28, 6:11 PM CDT	Mesoscale Discussion	SPC	2 hr
Aug 28, 7:00 PM CDT	Severe Thunderstorm Watch	SPC	5 hr
Aug 28, 10:19 PM CDT	Mesoscale Discussion	SPC	86 min
Sep 2, 3:57 PM CDT	Flash Flood Watch	LSX	46 hr
Sep 8, 1:22 PM CDT	Mesoscale Discussion	SPC	83 min
Sep 8, 7:04 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Sep 8, 7:27 PM CDT	Severe Thunderstorm Warning	LSX	48 min
Sep 8, 7:46 PM CDT	Tornado Warning	LSX	26 min
Sep 12, 12:07 PM CDT	Flash Flood Watch	LSX	47 hr
Sep 13, 11:33 AM CDT	River Flood Warning	LSX	10 days
Sep 14, 2:56 AM CDT	Wind Advisory	LSX	11 hr
Sep 14, 5:16 AM CDT	Areal Flood Warning	LSX	18 hr
Sep 14, 9:48 AM CDT	River Flood Warning	LSX	5 days
Sep 14, 9:48 AM CDT	River Flood Warning	LSX	5 days
Sep 14, 9:48 AM CDT	River Flood Warning	LSX	6 days
Sep 14, 9:57 AM CDT	River Flood Warning	LSX	42 hr
Sep 14, 9:37 PM CDT	Areal Flood Warning	LSX	12 hr
Sep 29, 3:50 PM CDT	Mesoscale Discussion	SPC	55 min
Sep 29, 5:17 PM CDT	Severe Thunderstorm Warning	LSX	43 min
Sep 29, 5:48 PM CDT	Tornado Warning	LSX	42 min
Oct 25, 3:50 PM CDT	Freeze Watch	LSX	35 hr
Oct 27, 3:16 AM CDT	Freeze Warning	LSX	30 hr
Dec 9, 6:58 PM CST	Mesoscale Discussion	SPC	3 hr
Dec 13, 3:42 AM CST	Winter Storm Watch	LSX	36 hr
Dec 14, 3:36 PM CST	Winter Weather Advisory	LSX	20 hr
Dec 14, 11:47 PM CST	Mesoscale Discussion	SPC	4 hr
Dec 15, 4:07 PM CST	Winter Weather Advisory	LSX	28 hr
Dec 17, 4:09 PM CST	Freezing Rain Advisory	LSX	32 hr
Dec 18, 4:34 AM CST	Freezing Rain Advisory	LSX	13 hr
Dec 19, 6:06 AM CST	Wind Advisory	LSX	5 hr
Dec 22, 3:57 PM CST	Freezing Rain Advisory	LSX	26 hr
Dec 23, 12:08 PM CST	Mesoscale Discussion	SPC	4 hr
Dec 25, 3:56 PM CST	Flash Flood Watch	LSX	50 hr
Dec 27, 4:05 AM CST	Wind Advisory	LSX	12 hr
Dec 27, 4:30 AM CST	Tornado Watch	SPC	8 hr
Dec 27, 8:03 AM CST	Mesoscale Discussion	SPC	117 min
Dec 27, 9:34 AM CST	Mesoscale Discussion	SPC	56 min
Dec 27, 10:26 AM CST	Mesoscale Discussion	SPC	94 min
Dec 27, 11:46 AM CST	Mesoscale Discussion	SPC	89 min
Dec 27, 12:41 PM CST	Flash Flood Warning	LSX	6 hr
Dec 27, 12:45 PM CST	Tornado Watch	SPC	5 hr
Dec 27, 12:53 PM CST	Severe Thunderstorm Warning	LSX	37 min
Dec 27, 1:06 PM CST	Severe Thunderstorm Warning	LSX	54 min
Dec 27, 4:14 PM CST	Areal Flood Advisory	LSX	4 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	8
Severe Thunderstorm Watch	17
Tornado Watch	9
Mesoscale Discussion	56
Flooding
Areal Flood Warning	2
Flash Flood Warning	8
River Flood Warning	27
Flash Flood Watch	16
Flood Watch	2
Areal Flood Advisory	4
Winter
Winter Storm Warning	4
Winter Storm Watch	5
Freezing Rain Advisory	3
Snow and Blowing Snow Advisory	1
Winter Weather Advisory	5
Heat
Excessive Heat Warning	1
Heat Advisory	2
Cold
Freeze Warning	1
Freeze Watch	1
Frost Advisory	1
Wind and dust
Wind Advisory	9
Fog and smoke
Dense Fog Advisory	3

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2007 2009

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.