Alert archive / Tennessee / Shelby County

Weather alerts in Shelby County, Tennessee, 2012

196 weather alerts in 2012, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Shelby County and its neighbors

Each county as a circle sized by its count in 2012. Tap one for its archive.

Alerts: 196
Warnings: 54
Watches: 21
Advisories: 54
Busiest month: September34 alerts
Busiest day: June 4, 201210 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 7 tornado warnings covering Shelby County in 2012 had a tornado report inside them.

Shelby County, 2012

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	7	2	71%	0
Severe thunderstorm warnings	35	18	49%	47	66%	22 min
Flash flood warnings	7	4	43%	11	82%	29 min

Each office's whole area, 2012

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Memphis, TN: tornado warnings	76	11	86%	22	68%	14 min
NWS Memphis, TN: severe thunderstorm warnings	482	201	58%	468	72%	22 min
NWS Memphis, TN: flash flood warnings	64	16	75%	39	82%	48 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, 3:16 AM CST	Wind Advisory	MEG	14 hr
Jan 11, 2:47 AM CST	Dense Fog Advisory	MEG	7 hr
Jan 12, 3:42 AM CST	Wind Advisory	MEG	13 hr
Jan 14, 3:07 AM CST	Wind Advisory	MEG	9 hr
Jan 14, 2:03 PM CST	Red Flag Warning	MEG	2 hr
Jan 16, 10:05 AM CST	Wind Advisory	MEG	8 hr
Jan 16, 11:34 PM CST	Wind Advisory	MEG	12 hr
Jan 20, 10:02 PM CST	Mesoscale Discussion	SPC	88 min
Jan 20, 10:35 PM CST	Tornado Watch	SPC	8 hr
Jan 22, 1:12 PM CST	Wind Advisory	MEG	14 hr
Jan 22, 2:26 PM CST	Mesoscale Discussion	SPC	2 hr
Jan 22, 5:16 PM CST	Tornado Watch PDS	SPC	6 hr
Jan 22, 8:37 PM CST	Mesoscale Discussion	SPC	83 min
Jan 22, 9:20 PM CST	Severe Thunderstorm Warning	MEG	55 min
Jan 22, 9:47 PM CST	Mesoscale Discussion	SPC	58 min
Jan 22, 9:55 PM CST	Tornado Warning	MEG	22 min
Jan 22, 10:10 PM CST	Tornado Warning	MEG	35 min
Jan 22, 10:14 PM CST	Severe Thunderstorm Warning	MEG	46 min
Jan 22, 10:27 PM CST	Tornado Warning	MEG	48 min
Feb 1, 2:58 PM CST	Mesoscale Discussion	SPC	2 hr
Feb 1, 3:45 PM CST	Severe Thunderstorm Watch	SPC	3 hr
Feb 13, 3:44 AM CST	Winter Weather Advisory	MEG	17 hr
Feb 18, 3:32 PM CST	Wind Advisory	MEG	12 hr
Feb 22, 4:13 AM CST	Special Weather Statement	MEG	62 min
Feb 23, 4:11 AM CST	Wind Advisory	MEG	14 hr
Feb 29, 12:34 AM CST	Wind Advisory	MEG	10 hr
Feb 29, 12:49 AM CST	Mesoscale Discussion	SPC	56 min
Feb 29, 11:11 AM CST	Mesoscale Discussion	SPC	2 hr
Feb 29, 11:31 AM CST	Tornado Watch	SPC	8 hr
Mar 2, 2:50 AM CST	Wind Advisory	MEG	15 hr
Mar 2, 9:22 AM CST	Mesoscale Discussion	SPC	113 min
Mar 2, 10:28 AM CST	Mesoscale Discussion	SPC	62 min
Mar 2, 1:28 PM CST	Red Flag Warning	MEG	5 hr
Mar 3, 8:49 PM CST	Fire Weather Watch	MEG	60 min
Mar 3, 9:53 PM CST	Fire Weather Watch	MEG	5 hr
Mar 4, 3:07 AM CST	Red Flag Warning	MEG	15 hr
Mar 7, 3:36 AM CST	Wind Advisory	MEG	14 hr
Mar 8, 5:10 PM CST	Wind Advisory	MEG	5 hr
Mar 12, 4:02 PM CDT	Mesoscale Discussion	SPC	58 min
Mar 16, 8:53 AM CDT	Flash Flood Warning	MEG	2 hr
Mar 16, 11:00 AM CDT	Flash Flood Warning	MEG	2 hr
Mar 20, 3:19 AM CDT	Wind Advisory	MEG	12 hr
Mar 31, 12:29 PM CDT	Mesoscale Discussion	SPC	91 min
Mar 31, 6:27 PM CDT	Severe Thunderstorm Warning	MEG	48 min
Mar 31, 7:08 PM CDT	Severe Thunderstorm Warning	MEG	52 min
Apr 5, 10:01 AM CDT	Special Weather Statement	MEG	29 min
Apr 5, 10:03 AM CDT	Severe Thunderstorm Warning	MEG	32 min
Apr 5, 12:09 PM CDT	Mesoscale Discussion	SPC	96 min
Apr 5, 12:18 PM CDT	Severe Thunderstorm Watch	SPC	5 hr
Apr 5, 2:22 PM CDT	Mesoscale Discussion	SPC	53 min
Apr 14, 7:05 PM CDT	Wind Advisory	MEG	27 hr
Apr 22, 1:16 PM CDT	Wind Advisory	MEG	6 hr
Apr 25, 4:02 AM CDT	Wind Advisory	MEG	11 hr
Apr 30, 1:55 PM CDT	Mesoscale Discussion	SPC	2 hr
May 2, 6:08 PM CDT	Mesoscale Discussion	SPC	97 min
May 6, 10:35 PM CDT	Special Weather Statement	MEG	25 min
May 14, 12:30 AM CDT	Dense Fog Advisory	MEG	7 hr
May 20, 1:33 PM CDT	Mesoscale Discussion	SPC	87 min
May 20, 5:09 PM CDT	Severe Thunderstorm Warning	MEG	51 min
May 31, 11:59 AM CDT	Mesoscale Discussion	SPC	61 min
May 31, 12:59 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
May 31, 2:02 PM CDT	Severe Thunderstorm Warning	MEG	43 min
May 31, 2:30 PM CDT	Severe Thunderstorm Warning	MEG	29 min
May 31, 2:38 PM CDT	Mesoscale Discussion	SPC	67 min
May 31, 2:39 PM CDT	Severe Thunderstorm Warning	MEG	51 min
May 31, 3:56 PM CDT	Areal Flood Advisory	MEG	94 min
Jun 3, 5:02 PM CDT	Mesoscale Discussion	SPC	88 min
Jun 3, 7:09 PM CDT	Tornado Watch	SPC	7 hr
Jun 3, 8:34 PM CDT	Mesoscale Discussion	SPC	56 min
Jun 3, 9:47 PM CDT	Severe Thunderstorm Warning	MEG	43 min
Jun 4, 3:08 AM CDT	Severe Thunderstorm Warning	MEG	52 min
Jun 4, 3:14 AM CDT	Mesoscale Discussion	SPC	91 min
Jun 4, 3:25 AM CDT	Special Weather Statement	MEG	35 min
Jun 4, 3:43 AM CDT	Special Weather Statement	MEG	47 min
Jun 4, 4:05 AM CDT	Severe Thunderstorm Warning	MEG	40 min
Jun 4, 10:19 AM CDT	Special Weather Statement	MEG	26 min
Jun 4, 10:22 AM CDT	Areal Flood Advisory	MEG	83 min
Jun 4, 9:11 PM CDT	Mesoscale Discussion	SPC	94 min
Jun 4, 9:43 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 11, 1:12 PM CDT	Mesoscale Discussion	SPC	93 min
Jun 11, 1:28 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 11, 2:38 PM CDT	Severe Thunderstorm Warning	MEG	52 min
Jun 11, 2:54 PM CDT	Severe Thunderstorm Warning	MEG	36 min
Jun 11, 3:25 PM CDT	Severe Thunderstorm Warning	MEG	50 min
Jun 11, 3:29 PM CDT	Mesoscale Discussion	SPC	2 hr
Jun 11, 4:53 PM CDT	Flash Flood Warning	MEG	87 min
Jun 11, 5:05 PM CDT	Mesoscale Discussion	SPC	55 min
Jun 28, 3:28 AM CDT	Heat Advisory	MEG	4 days
Jul 4, 3:35 AM CDT	Heat Advisory	MEG	4 days
Jul 6, 2:36 PM CDT	Mesoscale Discussion	SPC	84 min
Jul 6, 2:58 PM CDT	Severe Thunderstorm Watch	SPC	5 hr
Jul 6, 6:15 PM CDT	Mesoscale Discussion	SPC	2 hr
Jul 7, 7:24 PM CDT	Severe Thunderstorm Warning	MEG	41 min
Jul 10, 4:57 PM CDT	Flash Flood Warning	MEG	2 hr
Jul 14, 1:54 PM CDT	Areal Flood Advisory	MEG	49 min
Jul 18, 3:27 AM CDT	Heat Advisory	MEG	3 days
Jul 19, 9:47 PM CDT	Excessive Heat Watch	MEG	6 hr
Jul 20, 4:04 AM CDT	Excessive Heat Warning	MEG	15 hr
Jul 21, 3:04 PM CDT	Heat Advisory	MEG	5 days
Jul 21, 7:59 PM CDT	Special Weather Statement	MEG	31 min
Jul 26, 5:27 PM CDT	Mesoscale Discussion	SPC	33 min
Jul 26, 5:46 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jul 28, 11:18 AM CDT	Heat Advisory	MEG	8 hr
Jul 29, 3:34 PM CDT	Heat Advisory	MEG	28 hr
Jul 30, 5:19 PM CDT	Mesoscale Discussion	SPC	86 min
Jul 30, 9:00 PM CDT	Heat Advisory	MEG	67 hr
Aug 4, 3:36 AM CDT	Heat Advisory	MEG	15 hr
Aug 5, 4:14 AM CDT	Heat Advisory	MEG	13 hr
Aug 5, 2:06 PM CDT	Mesoscale Discussion	SPC	54 min
Aug 5, 4:57 PM CDT	Areal Flood Advisory	MEG	2 hr
Aug 13, 3:15 PM CDT	Mesoscale Discussion	SPC	30 min
Aug 13, 3:32 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Aug 16, 11:57 PM CDT	Special Weather Statement	MEG	33 min
Aug 17, 12:19 AM CDT	Severe Thunderstorm Warning	MEG	26 min
Aug 17, 12:59 AM CDT	Flash Flood Warning	MEG	3 hr
Aug 30, 6:16 PM CDT	Special Weather Statement	MEG	29 min
Aug 30, 7:05 PM CDT	Wind Advisory	MEG	4 hr
Aug 31, 7:14 AM CDT	Wind Advisory	MEG	11 hr
Aug 31, 8:47 PM CDT	Severe Thunderstorm Warning	MEG	43 min
Aug 31, 9:23 PM CDT	Special Weather Statement	MEG	22 min
Sep 1, 3:49 PM CDT	Tornado Watch	SPC	7 hr
Sep 1, 5:43 PM CDT	Mesoscale Discussion	SPC	92 min
Sep 1, 6:11 PM CDT	Severe Thunderstorm Warning	MEG	49 min
Sep 1, 6:28 PM CDT	Severe Thunderstorm Warning	MEG	47 min
Sep 1, 7:01 PM CDT	Severe Thunderstorm Warning	MEG	44 min
Sep 1, 7:29 PM CDT	Severe Thunderstorm Warning	MEG	31 min
Sep 1, 8:34 PM CDT	Areal Flood Advisory	MEG	86 min
Sep 1, 8:52 PM CDT	Severe Thunderstorm Warning	MEG	38 min
Sep 1, 9:45 PM CDT	Special Weather Statement	MEG	30 min
Sep 2, 3:42 PM CDT	Tornado Watch	SPC	7 hr
Sep 2, 7:13 PM CDT	Mesoscale Discussion	SPC	62 min
Sep 2, 7:22 PM CDT	Areal Flood Advisory	MEG	83 min
Sep 2, 7:37 PM CDT	Severe Thunderstorm Warning	MEG	53 min
Sep 2, 7:51 PM CDT	Tornado Warning	MEG	24 min
Sep 2, 7:55 PM CDT	Flash Flood Warning	MEG	3 hr
Sep 5, 4:53 AM CDT	Heat Advisory	MEG	14 hr
Sep 5, 5:31 PM CDT	Mesoscale Discussion	SPC	89 min
Sep 5, 7:02 PM CDT	Severe Thunderstorm Warning	MEG	28 min
Sep 5, 7:03 PM CDT	Areal Flood Advisory	MEG	87 min
Sep 6, 4:15 AM CDT	Heat Advisory	MEG	15 hr
Sep 6, 8:21 PM CDT	Special Weather Statement	MEG	24 min
Sep 6, 8:44 PM CDT	Special Weather Statement	MEG	31 min
Sep 6, 8:59 PM CDT	Areal Flood Advisory	MEG	61 min
Sep 6, 9:11 PM CDT	Special Weather Statement	MEG	34 min
Sep 6, 9:14 PM CDT	Severe Thunderstorm Warning	MEG	31 min
Sep 6, 9:47 PM CDT	Flash Flood Warning	MEG	99 min
Sep 7, 3:22 AM CDT	Heat Advisory	MEG	16 hr
Sep 7, 5:15 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Sep 7, 8:24 PM CDT	Mesoscale Discussion	SPC	96 min
Sep 7, 9:13 PM CDT	Severe Thunderstorm Warning	MEG	47 min
Sep 7, 9:34 PM CDT	Severe Thunderstorm Warning	MEG	41 min
Sep 17, 10:01 PM CDT	Dense Fog Advisory	MEG	6 hr
Oct 5, 4:29 PM CDT	Mesoscale Discussion	SPC	2 hr
Oct 5, 7:15 PM CDT	Special Weather Statement	MEG	30 min
Oct 5, 7:46 PM CDT	Special Weather Statement	MEG	14 min
Oct 12, 10:31 PM CDT	Dense Fog Advisory	MEG	10 hr
Oct 14, 3:36 AM CDT	Wind Advisory	MEG	14 hr
Oct 17, 3:49 AM CDT	Wind Advisory	MEG	20 hr
Oct 17, 3:44 PM CDT	Mesoscale Discussion	SPC	61 min
Oct 17, 5:21 PM CDT	Tornado Watch	SPC	7 hr
Oct 17, 7:35 PM CDT	Severe Thunderstorm Warning	MEG	40 min
Oct 17, 7:35 PM CDT	Mesoscale Discussion	SPC	85 min
Oct 17, 7:38 PM CDT	Tornado Warning	MEG	52 min
Oct 17, 8:05 PM CDT	Tornado Warning	MEG	25 min
Oct 17, 8:25 PM CDT	Tornado Warning	MEG	35 min
Oct 17, 8:42 PM CDT	Severe Thunderstorm Warning	MEG	38 min
Oct 17, 9:28 PM CDT	Mesoscale Discussion	SPC	92 min
Oct 17, 10:17 PM CDT	Special Weather Statement	MEG	28 min
Oct 30, 3:34 PM CDT	Frost Advisory	MEG	18 hr
Oct 31, 2:53 PM CDT	Frost Advisory	MEG	18 hr
Nov 3, 4:50 PM CDT	Special Weather Statement	MEG	25 min
Nov 3, 4:54 PM CDT	Severe Thunderstorm Warning	MEG	36 min
Nov 3, 4:56 PM CDT	Severe Thunderstorm Warning	MEG	23 min
Nov 3, 5:16 PM CDT	Mesoscale Discussion	SPC	89 min
Nov 3, 5:25 PM CDT	Severe Thunderstorm Warning	MEG	22 min
Nov 3, 5:40 PM CDT	Special Weather Statement	MEG	50 min
Nov 3, 5:42 PM CDT	Severe Thunderstorm Warning	MEG	48 min
Nov 7, 3:00 PM CST	Frost Advisory	MEG	17 hr
Nov 7, 3:00 PM CST	Freeze Warning	MEG	17 hr
Nov 11, 3:02 AM CST	Wind Advisory	MEG	18 hr
Nov 22, 3:06 AM CST	Dense Fog Advisory	MEG	6 hr
Dec 9, 1:46 AM CST	Mesoscale Discussion	SPC	2 hr
Dec 9, 12:38 PM CST	Mesoscale Discussion	SPC	2 hr
Dec 9, 2:10 PM CST	Tornado Watch	SPC	9 hr
Dec 9, 5:54 PM CST	Mesoscale Discussion	SPC	96 min
Dec 9, 8:02 PM CST	Mesoscale Discussion	SPC	58 min
Dec 9, 9:27 PM CST	Special Weather Statement	MEG	33 min
Dec 19, 3:32 AM CST	Wind Advisory	MEG	41 hr
Dec 20, 12:50 AM CST	Mesoscale Discussion	SPC	55 min
Dec 20, 1:07 AM CST	Severe Thunderstorm Watch	SPC	5 hr
Dec 20, 3:30 AM CST	Special Weather Statement	MEG	45 min
Dec 20, 4:03 AM CST	Severe Thunderstorm Warning	MEG	42 min
Dec 20, 4:08 AM CST	Mesoscale Discussion	SPC	67 min
Dec 25, 4:17 AM CST	Winter Weather Advisory	MEG	29 hr
Dec 25, 4:32 AM CST	Wind Advisory	MEG	28 hr
Dec 28, 4:10 AM CST	Freezing Rain Advisory	MEG	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	35
Tornado Warning	7
Severe Thunderstorm Watch	10
Tornado Watch	8
Mesoscale Discussion	46
Special Weather Statement	21
Flooding
Flash Flood Warning	7
Areal Flood Advisory	8
Winter
Freezing Rain Advisory	1
Winter Weather Advisory	2
Heat
Excessive Heat Warning	1
Excessive Heat Watch	1
Heat Advisory	12
Cold
Freeze Warning	1
Frost Advisory	3
Wind and dust
Wind Advisory	23
Fire
Red Flag Warning	3
Fire Weather Watch	2
Fog and smoke
Dense Fog Advisory	5

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2011 2013

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.