Alert archive / Mississippi / Clarke County

Weather alerts in Clarke County, Mississippi, 2011

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

Clarke County and its neighbors

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

Alerts: 196
Warnings: 56
Watches: 36
Advisories: 21
Busiest month: April43 alerts
Busiest day: April 15, 201114 alerts

Over time

By month

Warning verification

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

3 of 11 tornado warnings covering Clarke County in 2011 had a tornado report inside them; 6 of 6 tornado reports fell inside a warning, on average 23 minutes after it went out.

Clarke County, 2011

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	11	3	73%	6	100%	23 min
Severe thunderstorm warnings	29	15	48%	28	50%	18 min
Flash flood warnings	5	3	40%	4	100%	309 min

Each office's whole area, 2011

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Jackson, MS: tornado warnings	225	65	71%	184	85%	26 min
NWS Jackson, MS: severe thunderstorm warnings	717	416	42%	1,089	75%	24 min
NWS Jackson, MS: flash flood warnings	164	99	40%	205	93%	110 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, 10:46 PM CST	Tornado Watch	SPC	5 hr
Jan 1, 3:10 AM CST	Tornado Watch	SPC	7 hr
Jan 1, 4:47 AM CST	Flash Flood Warning	JAN	3 hr
Jan 1, 6:06 AM CST	Mesoscale Discussion	SPC	114 min
Jan 5, 10:53 PM CST	Dense Fog Advisory	JAN	11 hr
Jan 7, 3:30 PM CST	Winter Storm Watch	JAN	45 hr
Jan 8, 3:01 PM CST	Winter Storm Warning	JAN	37 hr
Jan 9, 12:45 PM CST	Winter Weather Advisory	JAN	23 hr
Jan 9, 3:06 PM CST	Mesoscale Discussion	SPC	4 hr
Jan 31, 2:38 PM CST	Wind Advisory	JAN	29 hr
Feb 1, 1:03 PM CST	Tornado Watch	SPC	7 hr
Feb 1, 2:45 PM CST	Severe Thunderstorm Warning	JAN	60 min
Feb 2, 3:54 PM CST	Winter Storm Watch	JAN	25 hr
Feb 3, 4:39 AM CST	Winter Storm Warning	JAN	31 hr
Feb 3, 12:58 PM CST	Mesoscale Discussion	SPC	5 hr
Feb 9, 5:28 AM CST	Winter Weather Advisory	JAN	22 hr
Feb 9, 2:17 PM CST	Hard Freeze Warning	JAN	45 hr
Feb 24, 11:31 PM CST	Severe Thunderstorm Warning	JAN	43 min
Mar 7, 6:02 PM CST	Flash Flood Watch	JAN	41 hr
Mar 8, 3:52 PM CST	River Flood Warning	JAN	4 days
Mar 8, 7:37 PM CST	Tornado Watch	SPC	7 hr
Mar 8, 9:40 PM CST	Mesoscale Discussion	SPC	65 min
Mar 9, 12:02 AM CST	Flash Flood Warning Emergency	JAN	7 hr
Mar 9, 1:28 AM CST	Mesoscale Discussion	SPC	92 min
Mar 9, 2:39 AM CST	Tornado Watch	SPC	5 hr
Mar 9, 6:28 AM CST	Mesoscale Discussion	SPC	92 min
Mar 9, 7:01 AM CST	Areal Flood Warning	JAN	3 hr
Mar 9, 11:48 AM CST	River Flood Warning	JAN	70 hr
Mar 9, 9:38 PM CST	Areal Flood Warning	JAN	12 hr
Mar 14, 1:22 PM CDT	Severe Thunderstorm Watch	SPC	5 hr
Mar 29, 4:19 AM CDT	Flash Flood Watch	JAN	26 hr
Mar 29, 3:17 PM CDT	Tornado Watch	SPC	7 hr
Mar 29, 9:42 PM CDT	Tornado Watch	SPC	7 hr
Mar 29, 11:39 PM CDT	Mesoscale Discussion	SPC	2 hr
Apr 4, 12:05 AM CDT	Wind Advisory	JAN	22 hr
Apr 4, 10:53 AM CDT	Tornado Watch	SPC	7 hr
Apr 4, 2:52 PM CDT	Mesoscale Discussion	SPC	113 min
Apr 4, 5:28 PM CDT	Tornado Watch	SPC	7 hr
Apr 4, 6:50 PM CDT	Mesoscale Discussion	SPC	85 min
Apr 4, 6:51 PM CDT	Severe Thunderstorm Warning	JAN	39 min
Apr 4, 7:35 PM CDT	Special Weather Statement	JAN	30 min
Apr 11, 3:56 PM CDT	Mesoscale Discussion	SPC	34 min
Apr 11, 4:05 PM CDT	Tornado Watch	SPC	6 hr
Apr 11, 5:54 PM CDT	Severe Thunderstorm Warning	JAN	51 min
Apr 11, 6:35 PM CDT	Severe Thunderstorm Warning	JAN	40 min
Apr 15, 7:32 AM CDT	Tornado Watch	SPC	7 hr
Apr 15, 10:28 AM CDT	Severe Thunderstorm Warning	JAN	47 min
Apr 15, 10:28 AM CDT	Mesoscale Discussion	SPC	2 hr
Apr 15, 10:33 AM CDT	Tornado Warning	JAN	57 min
Apr 15, 11:14 AM CDT	Tornado Warning	JAN	18 min
Apr 15, 1:30 PM CDT	Mesoscale Discussion	SPC	2 hr
Apr 15, 2:41 PM CDT	Tornado Watch	SPC	7 hr
Apr 15, 3:05 PM CDT	Tornado Warning	JAN	55 min
Apr 15, 3:35 PM CDT	Mesoscale Discussion	SPC	85 min
Apr 15, 3:56 PM CDT	Tornado Warning	JAN	34 min
Apr 15, 5:21 PM CDT	Tornado Warning	JAN	54 min
Apr 15, 6:09 PM CDT	Mesoscale Discussion	SPC	96 min
Apr 15, 6:14 PM CDT	Severe Thunderstorm Warning	JAN	34 min
Apr 15, 6:30 PM CDT	Tornado Warning	JAN	18 min
Apr 15, 7:51 PM CDT	Mesoscale Discussion	SPC	54 min
Apr 20, 1:02 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Apr 21, 10:00 AM CDT	Mesoscale Discussion	SPC	90 min
Apr 26, 7:37 AM CDT	Severe Thunderstorm Warning	JAN	53 min
Apr 26, 8:29 AM CDT	Severe Thunderstorm Warning	JAN	31 min
Apr 26, 1:48 PM CDT	Wind Advisory	JAN	29 hr
Apr 27, 1:56 AM CDT	Mesoscale Discussion	SPC	64 min
Apr 27, 2:26 AM CDT	Tornado Watch	SPC	6 hr
Apr 27, 3:46 AM CDT	Severe Thunderstorm Warning	JAN	44 min
Apr 27, 10:45 AM CDT	Mesoscale Discussion	SPC	90 min
Apr 27, 11:02 AM CDT	Tornado Watch PDS	SPC	8 hr
Apr 27, 2:56 PM CDT	Mesoscale Discussion	SPC	2 hr
Apr 27, 5:01 PM CDT	Mesoscale Discussion	SPC	89 min
Apr 27, 6:22 PM CDT	Tornado Warning Emergency	JAN	53 min
Apr 27, 6:27 PM CDT	Mesoscale Discussion	SPC	33 min
Apr 27, 6:42 PM CDT	Tornado Watch	SPC	3 hr
Apr 27, 7:22 PM CDT	Severe Thunderstorm Warning	JAN	53 min
Apr 27, 7:59 PM CDT	Severe Thunderstorm Warning	JAN	46 min
May 13, 7:58 PM CDT	Mesoscale Discussion	SPC	62 min
May 13, 10:42 PM CDT	Special Weather Statement	JAN	58 min
May 13, 11:17 PM CDT	Severe Thunderstorm Warning	JAN	28 min
May 26, 12:22 PM CDT	Mesoscale Discussion	SPC	83 min
May 26, 1:50 PM CDT	Severe Thunderstorm Warning	JAN	40 min
May 26, 1:54 PM CDT	Severe Thunderstorm Warning	JAN	51 min
May 26, 2:15 PM CDT	Severe Thunderstorm Warning	JAN	45 min
Jun 2, 2:48 PM CDT	Heat Advisory	JAN	3 days
Jun 2, 5:06 PM CDT	Mesoscale Discussion	SPC	54 min
Jun 3, 5:32 PM CDT	Mesoscale Discussion	SPC	118 min
Jun 5, 6:13 PM CDT	Mesoscale Discussion	SPC	2 hr
Jun 7, 4:20 PM CDT	Severe Thunderstorm Warning	JAN	35 min
Jun 7, 6:04 PM CDT	Mesoscale Discussion	SPC	116 min
Jun 8, 2:32 PM CDT	Special Weather Statement	JAN	18 min
Jun 8, 3:11 PM CDT	Special Weather Statement	JAN	29 min
Jun 8, 3:22 PM CDT	Severe Thunderstorm Warning	JAN	53 min
Jun 8, 3:43 PM CDT	Severe Thunderstorm Warning	JAN	47 min
Jun 8, 4:45 PM CDT	Special Weather Statement	JAN	30 min
Jun 10, 6:09 PM CDT	Special Weather Statement	JAN	31 min
Jun 12, 5:46 PM CDT	Severe Thunderstorm Warning	JAN	44 min
Jun 13, 1:32 PM CDT	Mesoscale Discussion	SPC	58 min
Jun 13, 2:45 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 13, 5:59 PM CDT	Mesoscale Discussion	SPC	61 min
Jun 13, 6:20 PM CDT	Severe Thunderstorm Warning	JAN	40 min
Jun 13, 6:57 PM CDT	Severe Thunderstorm Warning	JAN	48 min
Jun 16, 12:02 PM CDT	Mesoscale Discussion	SPC	58 min
Jun 16, 3:13 PM CDT	Mesoscale Discussion	SPC	62 min
Jun 16, 3:39 PM CDT	Severe Thunderstorm Watch	SPC	5 hr
Jun 16, 5:42 PM CDT	Special Weather Statement	JAN	28 min
Jun 16, 6:11 PM CDT	Special Weather Statement	JAN	29 min
Jun 16, 6:18 PM CDT	Mesoscale Discussion	SPC	87 min
Jun 17, 11:42 AM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 17, 2:45 PM CDT	Mesoscale Discussion	SPC	60 min
Jun 21, 4:07 PM CDT	Special Weather Statement	JAN	58 min
Jun 24, 5:20 PM CDT	Mesoscale Discussion	SPC	85 min
Jun 24, 6:37 PM CDT	Special Weather Statement	JAN	58 min
Jun 28, 9:52 AM CDT	Mesoscale Discussion	SPC	113 min
Jun 28, 10:26 AM CDT	Severe Thunderstorm Watch	SPC	8 hr
Jun 28, 2:22 PM CDT	Special Weather Statement	JAN	28 min
Jun 28, 2:24 PM CDT	Severe Thunderstorm Warning	JAN	39 min
Jun 28, 3:19 PM CDT	Mesoscale Discussion	SPC	116 min
Jul 3, 2:04 PM CDT	Special Weather Statement	JAN	46 min
Jul 4, 12:41 PM CDT	Special Weather Statement	JAN	39 min
Jul 5, 1:15 PM CDT	Special Weather Statement	JAN	45 min
Jul 6, 5:51 AM CDT	Dense Fog Advisory	JAN	3 hr
Jul 9, 4:39 AM CDT	Heat Advisory	JAN	6 days
Jul 10, 6:18 PM CDT	Special Weather Statement	JAN	32 min
Jul 11, 5:29 PM CDT	Special Weather Statement	JAN	31 min
Jul 11, 5:46 PM CDT	Severe Thunderstorm Warning	JAN	44 min
Jul 13, 3:44 PM CDT	Special Weather Statement	JAN	46 min
Jul 24, 9:05 AM CDT	Flash Flood Warning	JAN	115 min
Jul 25, 5:33 AM CDT	Flash Flood Watch	JAN	12 hr
Jul 31, 4:00 AM CDT	Heat Advisory	JAN	72 hr
Aug 1, 3:53 AM CDT	Excessive Heat Warning	JAN	5 days
Aug 3, 2:49 PM CDT	Heat Advisory	JAN	8 days
Aug 4, 12:09 PM CDT	Mesoscale Discussion	SPC	66 min
Aug 6, 3:41 PM CDT	Special Weather Statement	JAN	29 min
Aug 9, 1:20 PM CDT	Mesoscale Discussion	SPC	115 min
Aug 9, 2:54 PM CDT	Special Weather Statement	JAN	46 min
Aug 9, 3:30 PM CDT	Special Weather Statement	JAN	30 min
Aug 9, 3:49 PM CDT	Severe Thunderstorm Warning	JAN	41 min
Aug 9, 5:44 PM CDT	Special Weather Statement	JAN	46 min
Aug 9, 5:52 PM CDT	Severe Thunderstorm Warning	JAN	38 min
Aug 10, 5:34 PM CDT	Mesoscale Discussion	SPC	86 min
Aug 10, 7:12 PM CDT	Severe Thunderstorm Warning	JAN	36 min
Aug 12, 2:05 PM CDT	Mesoscale Discussion	SPC	115 min
Aug 13, 1:57 PM CDT	Mesoscale Discussion	SPC	2 hr
Aug 18, 1:04 PM CDT	Mesoscale Discussion	SPC	116 min
Aug 18, 4:24 PM CDT	Heat Advisory	JAN	3 days
Aug 21, 1:56 PM CDT	Special Weather Statement	JAN	39 min
Aug 23, 3:40 PM CDT	Special Weather Statement	JAN	45 min
Sep 2, 3:11 PM CDT	Flash Flood Watch	JAN	3 days
Sep 3, 3:57 PM CDT	Wind Advisory	JAN	52 hr
Sep 4, 5:05 AM CDT	Tornado Watch	SPC	11 hr
Sep 4, 9:50 AM CDT	Mesoscale Discussion	SPC	85 min
Sep 4, 10:10 AM CDT	River Flood Warning	JAN	25 hr
Sep 4, 12:25 PM CDT	Tornado Warning	JAN	50 min
Sep 4, 1:13 PM CDT	Tornado Warning	JAN	47 min
Sep 4, 1:15 PM CDT	Flash Flood Warning	JAN	2 hr
Sep 4, 2:45 PM CDT	Special Weather Statement	JAN	30 min
Sep 4, 2:47 PM CDT	Mesoscale Discussion	SPC	88 min
Sep 4, 3:47 PM CDT	Tornado Watch	SPC	6 hr
Sep 4, 6:29 PM CDT	Mesoscale Discussion	SPC	2 hr
Sep 4, 9:42 PM CDT	Tornado Watch	SPC	9 hr
Sep 4, 11:35 PM CDT	Mesoscale Discussion	SPC	115 min
Sep 5, 4:26 AM CDT	Mesoscale Discussion	SPC	94 min
Sep 5, 5:35 AM CDT	Tornado Watch	SPC	10 hr
Sep 19, 12:29 PM CDT	Mesoscale Discussion	SPC	91 min
Sep 19, 8:11 PM CDT	Flash Flood Warning	JAN	2 hr
Sep 26, 3:10 PM CDT	Mesoscale Discussion	SPC	95 min
Sep 29, 3:59 AM CDT	Dense Fog Advisory	JAN	5 hr
Oct 12, 6:53 PM CDT	Special Weather Statement	JAN	62 min
Oct 12, 7:02 PM CDT	Special Weather Statement	JAN	58 min
Oct 18, 4:20 AM CDT	Dense Fog Advisory	JAN	5 hr
Oct 28, 2:46 PM CDT	Freeze Watch	JAN	27 hr
Oct 29, 3:43 AM CDT	Freeze Warning	JAN	28 hr
Nov 10, 4:08 AM CST	Freeze Warning	JAN	28 hr
Nov 16, 1:35 AM CST	Mesoscale Discussion	SPC	115 min
Nov 16, 2:20 AM CST	Tornado Watch	SPC	8 hr
Nov 16, 5:33 AM CST	Mesoscale Discussion	SPC	87 min
Nov 16, 5:47 AM CST	Tornado Warning	JAN	43 min
Nov 16, 6:32 AM CST	Tornado Warning	JAN	28 min
Nov 16, 5:34 PM CST	Special Weather Statement	JAN	46 min
Nov 20, 1:28 AM CST	Dense Fog Advisory	JAN	8 hr
Nov 20, 10:08 PM CST	Dense Fog Advisory	JAN	11 hr
Nov 21, 7:18 PM CST	Dense Fog Advisory	JAN	9 hr
Nov 22, 11:38 AM CST	Mesoscale Discussion	SPC	37 min
Nov 22, 11:58 AM CST	Tornado Watch	SPC	8 hr
Nov 22, 1:39 PM CST	Special Weather Statement	JAN	31 min
Dec 12, 2:36 PM CST	Dense Fog Advisory	JAN	12 hr
Dec 13, 7:57 PM CST	Dense Fog Advisory	JAN	13 hr
Dec 22, 3:38 AM CST	Dense Fog Advisory	JAN	5 hr
Dec 22, 4:11 AM CST	Mesoscale Discussion	SPC	34 min
Dec 22, 4:36 AM CST	Tornado Watch	SPC	7 hr
Dec 22, 7:50 AM CST	Mesoscale Discussion	SPC	55 min
Dec 22, 10:52 AM CST	Severe Thunderstorm Warning	JAN	38 min
Dec 22, 11:25 AM CST	Severe Thunderstorm Warning	JAN	31 min
Dec 22, 2:51 PM CST	Mesoscale Discussion	SPC	54 min
Dec 25, 2:43 PM CST	Flood Watch	JAN	31 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	29
Tornado Warning	11
Severe Thunderstorm Watch	6
Tornado Watch	22
Mesoscale Discussion	55
Special Weather Statement	28
Flooding
Areal Flood Warning	2
Flash Flood Warning	5
River Flood Warning	3
Flash Flood Watch	4
Flood Watch	1
Winter
Winter Storm Warning	2
Winter Storm Watch	2
Winter Weather Advisory	2
Heat
Excessive Heat Warning	1
Heat Advisory	5
Cold
Freeze Warning	2
Hard Freeze Warning	1
Freeze Watch	1
Wind and dust
Wind Advisory	4
Fog and smoke
Dense Fog Advisory	10

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.