Alert archive / Mississippi / Walthall County

Weather alerts in Walthall County, Mississippi, 2017

137 weather alerts in 2017, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Walthall County and its neighbors

Each county as a circle sized by its count in 2017. Tap one for its archive.

Alerts: 137
Warnings: 29
Watches: 20
Advisories: 33
Busiest month: January33 alerts
Busiest day: January 21, 201710 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 7 tornado warnings covering Walthall County in 2017 had a tornado report inside them; 2 of 6 tornado reports fell inside a warning, on average 11 minutes after it went out.

Walthall County, 2017

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	7	1	86%	6	33%	11 min
Severe thunderstorm warnings	11	6	45%	3	67%	21 min
Flash flood warnings	0			0

Each office's whole area, 2017

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS New Orleans, LA: tornado warnings	119	15	87%	48	50%	14 min
NWS New Orleans, LA: severe thunderstorm warnings	143	34	76%	106	59%	18 min
NWS New Orleans, LA: flash flood warnings	45	15	67%	32	75%	68 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 2, 10:17 AM CST	Mesoscale Discussion	SPC	118 min
Jan 2, 11:22 AM CST	Tornado Watch	SPC	9 hr
Jan 2, 1:20 PM CST	Severe Thunderstorm Warning	LIX	55 min
Jan 2, 1:33 PM CST	Tornado Warning	LIX	12 min
Jan 2, 1:52 PM CST	Severe Thunderstorm Warning	LIX	53 min
Jan 2, 2:03 PM CST	Mesoscale Discussion	SPC	117 min
Jan 2, 2:35 PM CST	Severe Thunderstorm Warning	LIX	55 min
Jan 2, 9:27 PM CST	Dense Fog Advisory	LIX	11 hr
Jan 5, 2:12 PM CST	Winter Weather Advisory	LIX	32 hr
Jan 6, 3:51 AM CST	Hard Freeze Warning	LIX	31 hr
Jan 6, 9:49 AM CST	Wind Chill Advisory	LIX	24 hr
Jan 6, 10:13 AM CST	Winter Storm Warning	LIX	12 hr
Jan 7, 9:47 AM CST	Hard Freeze Warning	LIX	50 min
Jan 7, 10:37 AM CST	Hard Freeze Warning	LIX	22 hr
Jan 13, 3:40 AM CST	Dense Fog Advisory	LIX	5 hr
Jan 13, 3:37 PM CST	Dense Fog Advisory	LIX	20 hr
Jan 14, 3:41 PM CST	Dense Fog Advisory	LIX	18 hr
Jan 17, 7:20 PM CST	Dense Fog Advisory	LIX	15 hr
Jan 19, 9:03 AM CST	Flash Flood Watch	LIX	9 hr
Jan 20, 3:59 AM CST	Dense Fog Advisory	LIX	4 hr
Jan 20, 10:44 PM CST	Mesoscale Discussion	SPC	61 min
Jan 20, 11:00 PM CST	Tornado Watch	SPC	8 hr
Jan 21, 2:28 AM CST	Severe Thunderstorm Warning	LIX	32 min
Jan 21, 2:55 AM CST	Mesoscale Discussion	SPC	2 hr
Jan 21, 2:57 AM CST	Severe Thunderstorm Warning	LIX	33 min
Jan 21, 2:57 AM CST	Severe Thunderstorm Warning	LIX	48 min
Jan 21, 3:02 AM CST	Tornado Warning	LIX	13 min
Jan 21, 3:04 AM CST	Tornado Warning	LIX	15 min
Jan 21, 2:34 PM CST	Mesoscale Discussion	SPC	2 hr
Jan 21, 3:29 PM CST	Tornado Watch	SPC	6 hr
Jan 21, 6:05 PM CST	Mesoscale Discussion	SPC	85 min
Jan 21, 8:43 PM CST	Special Weather Statement	LIX	32 min
Jan 22, 4:13 AM CST	Wind Advisory	LIX	20 hr
Feb 2, 4:33 AM CST	Dense Fog Advisory	LIX	4 hr
Feb 7, 5:59 AM CST	Mesoscale Discussion	SPC	2 hr
Feb 7, 7:54 AM CST	Special Weather Statement	LIX	36 min
Feb 7, 7:54 AM CST	Tornado Watch	SPC	11 hr
Feb 7, 9:20 AM CST	Tornado Warning	LIX	25 min
Feb 7, 9:43 AM CST	Tornado Warning	LIX	47 min
Feb 7, 10:18 AM CST	Mesoscale Discussion	SPC	117 min
Feb 7, 12:56 PM CST	Mesoscale Discussion	SPC	64 min
Feb 18, 3:40 PM CST	Dense Fog Advisory	LIX	17 hr
Feb 19, 9:55 PM CST	Dense Fog Advisory	LIX	11 hr
Feb 20, 9:04 PM CST	Special Weather Statement	LIX	56 min
Feb 20, 10:36 PM CST	Special Weather Statement	LIX	54 min
Mar 1, 1:32 PM CST	Mesoscale Discussion	SPC	2 hr
Mar 1, 4:42 PM CST	Special Weather Statement	LIX	33 min
Mar 7, 3:50 PM CST	Special Weather Statement	LIX	55 min
Mar 20, 4:07 AM CDT	Dense Fog Advisory	LIX	5 hr
Mar 20, 9:33 PM CDT	Dense Fog Advisory	LIX	12 hr
Mar 24, 9:06 AM CDT	Wind Advisory	LIX	10 hr
Mar 25, 6:42 AM CDT	Special Weather Statement	LIX	63 min
Mar 25, 7:17 AM CDT	Special Weather Statement	LIX	43 min
Mar 30, 1:34 AM CDT	Mesoscale Discussion	SPC	86 min
Mar 30, 4:39 AM CDT	Special Weather Statement	LIX	36 min
Apr 1, 3:01 PM CDT	Flash Flood Watch	LIX	42 hr
Apr 2, 3:08 PM CDT	Mesoscale Discussion	SPC	3 hr
Apr 2, 4:52 PM CDT	Tornado Watch	SPC	9 hr
Apr 2, 9:09 PM CDT	Mesoscale Discussion	SPC	2 hr
Apr 2, 11:37 PM CDT	Mesoscale Discussion	SPC	83 min
Apr 3, 1:48 AM CDT	Tornado Watch	SPC	10 hr
Apr 3, 2:39 AM CDT	Tornado Warning	LIX	17 min
Apr 3, 3:13 AM CDT	Severe Thunderstorm Warning	LIX	32 min
Apr 3, 3:40 AM CDT	Severe Thunderstorm Warning	LIX	50 min
Apr 3, 3:59 AM CDT	Mesoscale Discussion	SPC	2 hr
Apr 3, 9:54 AM CDT	River Flood Warning	LIX	47 hr
Apr 20, 6:31 AM CDT	Dense Fog Advisory	LIX	68 min
Apr 28, 3:28 PM CDT	Wind Advisory	LIX	31 hr
Apr 29, 11:32 PM CDT	Wind Advisory	LIX	16 hr
Apr 30, 6:59 AM CDT	Mesoscale Discussion	SPC	2 hr
Apr 30, 7:32 AM CDT	Tornado Watch	SPC	7 hr
Apr 30, 8:57 AM CDT	Severe Thunderstorm Warning	LIX	33 min
Apr 30, 9:28 AM CDT	Tornado Warning	LIX	32 min
Apr 30, 9:31 AM CDT	Severe Thunderstorm Warning	LIX	44 min
May 2, 3:50 PM CDT	Flash Flood Watch	LIX	35 hr
May 12, 1:43 PM CDT	Mesoscale Discussion	SPC	3 hr
May 20, 1:11 PM CDT	Areal Flood Advisory	LIX	2 hr
May 20, 2:12 PM CDT	Mesoscale Discussion	SPC	93 min
May 20, 3:29 PM CDT	Flash Flood Watch	LIX	6 hr
May 21, 3:48 AM CDT	Flash Flood Watch	LIX	56 hr
May 21, 6:44 AM CDT	Special Weather Statement	LIX	46 min
May 21, 7:01 AM CDT	Severe Thunderstorm Warning	LIX	29 min
May 21, 2:22 PM CDT	Mesoscale Discussion	SPC	113 min
Jun 11, 1:52 PM CDT	Special Weather Statement	LIX	38 min
Jun 16, 12:05 PM CDT	Mesoscale Discussion	SPC	2 hr
Jun 16, 3:40 PM CDT	Mesoscale Discussion	SPC	2 hr
Jun 16, 6:19 PM CDT	Mesoscale Discussion	SPC	56 min
Jun 16, 9:53 PM CDT	Special Weather Statement	LIX	37 min
Jun 17, 1:21 PM CDT	Mesoscale Discussion	SPC	2 hr
Jun 19, 3:52 PM CDT	Flash Flood Watch	LIX	3 days
Jun 21, 10:01 AM CDT	Tornado Watch	SPC	9 hr
Jun 21, 6:29 PM CDT	Mesoscale Discussion	SPC	61 min
Jun 22, 2:24 AM CDT	Mesoscale Discussion	SPC	96 min
Jun 22, 2:57 AM CDT	Tornado Watch	SPC	10 hr
Jun 22, 11:50 AM CDT	Mesoscale Discussion	SPC	85 min
Jun 22, 1:04 PM CDT	Tornado Watch	SPC	9 hr
Jun 22, 3:48 PM CDT	Mesoscale Discussion	SPC	87 min
Jun 22, 8:57 PM CDT	Mesoscale Discussion	SPC	63 min
Jun 24, 3:51 AM CDT	Flash Flood Watch	LIX	17 hr
Jul 8, 8:45 AM CDT	Special Weather Statement	LIX	45 min
Jul 21, 5:38 PM CDT	Special Weather Statement	JAN	37 min
Jul 21, 5:58 PM CDT	Special Weather Statement	LIX	62 min
Jul 24, 7:45 AM CDT	Areal Flood Advisory	LIX	2 hr
Jul 24, 9:49 AM CDT	Flash Flood Watch	LIX	32 hr
Jul 24, 10:07 PM CDT	River Flood Warning	LIX	56 hr
Jul 25, 9:24 AM CDT	Areal Flood Advisory	LIX	2 hr
Jul 26, 1:22 AM CDT	River Flood Warning	LIX	15 hr
Jul 26, 7:43 PM CDT	River Flood Warning	LIX	32 hr
Aug 8, 2:26 PM CDT	Special Weather Statement	LIX	49 min
Aug 14, 6:12 PM CDT	Special Weather Statement	LIX	48 min
Aug 16, 3:34 PM CDT	Heat Advisory	LIX	27 hr
Aug 27, 3:55 PM CDT	Flash Flood Watch	LIX	4 days
Aug 30, 9:51 AM CDT	Mesoscale Discussion	SPC	114 min
Aug 30, 10:22 AM CDT	Tornado Watch	SPC	8 hr
Aug 30, 5:50 PM CDT	Mesoscale Discussion	SPC	55 min
Oct 22, 5:41 AM CDT	Mesoscale Discussion	SPC	2 hr
Oct 22, 11:07 AM CDT	Special Weather Statement	LIX	23 min
Nov 5, 9:43 PM CST	Dense Fog Advisory	LIX	8 hr
Nov 16, 3:13 AM CST	Dense Fog Advisory	LIX	6 hr
Nov 18, 7:29 PM CST	Special Weather Statement	LIX	46 min
Nov 23, 3:31 PM CST	Freeze Warning	LIX	16 hr
Nov 29, 9:55 PM CST	Dense Fog Advisory	LIX	11 hr
Nov 30, 7:35 PM CST	Dense Fog Advisory	LIX	13 hr
Dec 1, 9:31 PM CST	Dense Fog Advisory	LIX	11 hr
Dec 2, 4:06 PM CST	Dense Fog Advisory	LIX	17 hr
Dec 7, 4:51 AM CST	Winter Weather Advisory	LIX	37 hr
Dec 7, 9:04 PM CST	Special Weather Statement	LIX	26 min
Dec 8, 12:46 AM CST	Special Weather Statement	LIX	29 min
Dec 8, 8:32 AM CST	Winter Storm Warning	LIX	9 hr
Dec 8, 11:27 AM CST	Hard Freeze Warning	LIX	23 hr
Dec 17, 5:13 PM CST	Dense Fog Advisory	LIX	23 hr
Dec 18, 5:47 PM CST	Dense Fog Advisory	LIX	42 hr
Dec 20, 6:15 AM CST	Special Weather Statement	LIX	45 min
Dec 20, 6:18 AM CST	Mesoscale Discussion	SPC	2 hr
Dec 21, 3:14 AM CST	Dense Fog Advisory	LIX	6 hr
Dec 21, 3:51 PM CST	Dense Fog Advisory	LIX	18 hr
Dec 23, 5:13 AM CST	Special Weather Statement	LIX	62 min

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	11
Tornado Warning	7
Tornado Watch	11
Mesoscale Discussion	32
Special Weather Statement	23
Flooding
River Flood Warning	4
Flash Flood Watch	9
Areal Flood Advisory	3
Winter
Winter Storm Warning	2
Winter Weather Advisory	2
Heat
Heat Advisory	1
Cold
Freeze Warning	1
Hard Freeze Warning	4
Wind Chill Advisory	1
Wind and dust
Wind Advisory	4
Fog and smoke
Dense Fog Advisory	22

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2016 2018

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.