Alert archive / Tennessee / Williamson County

Weather alerts in Williamson County, Tennessee, 2013

167 weather alerts in 2013, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Williamson County and its neighbors

Each county as a circle sized by its count in 2013. Tap one for its archive.

Alerts: 167
Warnings: 42
Watches: 15
Advisories: 49
Busiest month: January29 alerts
Busiest day: January 30, 201312 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 9 tornado warnings covering Williamson County in 2013 had a tornado report inside them; 2 of 3 tornado reports fell inside a warning, on average 26 minutes after it went out.

Williamson County, 2013

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	9	3	67%	3	67%	26 min
Severe thunderstorm warnings	22	17	23%	35	86%	18 min
Flash flood warnings	5	4	20%	4	100%	71 min

Each office's whole area, 2013

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Nashville, TN: tornado warnings	50	16	68%	40	83%	17 min
NWS Nashville, TN: severe thunderstorm warnings	157	91	42%	346	70%	20 min
NWS Nashville, TN: flash flood warnings	35	19	46%	97	77%	160 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 12, 3:59 AM CST	Flash Flood Watch	OHX	42 hr
Jan 13, 5:14 AM CST	Flash Flood Warning	OHX	6 hr
Jan 13, 10:11 AM CST	Mesoscale Discussion	SPC	94 min
Jan 13, 10:45 AM CST	Special Weather Statement	OHX	60 min
Jan 13, 10:50 AM CST	Flash Flood Warning	OHX	4 hr
Jan 13, 10:55 AM CST	Flash Flood Warning	OHX	4 hr
Jan 13, 1:16 PM CST	Special Weather Statement	OHX	44 min
Jan 13, 2:46 PM CST	Mesoscale Discussion	SPC	119 min
Jan 13, 3:01 PM CST	Special Weather Statement	OHX	44 min
Jan 13, 3:21 PM CST	Tornado Warning	OHX	24 min
Jan 13, 3:38 PM CST	Areal Flood Warning	OHX	6 hr
Jan 13, 4:07 PM CST	Areal Flood Warning	OHX	3 hr
Jan 14, 10:44 AM CST	Winter Weather Advisory	OHX	44 hr
Jan 14, 5:12 PM CST	Mesoscale Discussion	SPC	5 hr
Jan 15, 10:05 AM CST	Ice Storm Warning	OHX	20 hr
Jan 24, 5:13 AM CST	Winter Weather Advisory	OHX	33 hr
Jan 29, 3:57 AM CST	Wind Advisory	OHX	41 hr
Jan 29, 9:49 PM CST	Mesoscale Discussion	SPC	116 min
Jan 29, 10:07 PM CST	Tornado Watch	SPC	6 hr
Jan 30, 2:40 AM CST	Severe Thunderstorm Warning	OHX	35 min
Jan 30, 2:46 AM CST	Severe Thunderstorm Warning	OHX	44 min
Jan 30, 2:51 AM CST	Tornado Warning	OHX	39 min
Jan 30, 3:01 AM CST	Severe Thunderstorm Warning	OHX	59 min
Jan 30, 3:03 AM CST	Mesoscale Discussion	SPC	57 min
Jan 30, 3:16 AM CST	Tornado Warning	OHX	44 min
Jan 30, 3:26 AM CST	Severe Thunderstorm Warning	OHX	64 min
Jan 30, 3:27 AM CST	Tornado Warning	OHX	33 min
Jan 30, 3:46 AM CST	Tornado Warning	OHX	29 min
Jan 30, 4:28 AM CST	Severe Thunderstorm Warning	OHX	62 min
Feb 1, 3:24 PM CST	Winter Weather Advisory	OHX	43 hr
Feb 9, 3:21 PM CST	Wind Advisory	OHX	24 hr
Feb 18, 3:42 AM CST	Wind Advisory	OHX	20 hr
Feb 25, 3:33 AM CST	Wind Advisory	OHX	19 hr
Feb 26, 1:32 AM CST	Special Weather Statement	OHX	58 min
Mar 5, 3:49 AM CST	Wind Advisory	OHX	20 hr
Mar 5, 9:25 AM CST	Special Weather Statement	OHX	50 min
Mar 9, 5:42 PM CST	Wind Advisory	OHX	26 hr
Mar 11, 1:12 AM CDT	Wind Advisory	OHX	6 hr
Mar 18, 7:40 AM CDT	Mesoscale Discussion	SPC	2 hr
Mar 18, 8:09 AM CDT	Severe Thunderstorm Watch	SPC	7 hr
Mar 18, 8:15 AM CDT	Severe Thunderstorm Warning	OHX	45 min
Mar 18, 9:00 AM CDT	Special Weather Statement	OHX	45 min
Mar 24, 2:24 AM CDT	Wind Advisory	OHX	35 hr
Mar 24, 11:48 AM CDT	Mesoscale Discussion	SPC	117 min
Mar 24, 12:14 PM CDT	Special Weather Statement	OHX	2 hr
Mar 30, 3:37 AM CDT	Dense Fog Advisory	OHX	5 hr
Mar 31, 9:53 PM CDT	Dense Fog Advisory	OHX	11 hr
Apr 5, 2:02 AM CDT	Dense Fog Advisory	OHX	7 hr
Apr 11, 11:55 AM CDT	Severe Thunderstorm Warning	OHX	35 min
Apr 11, 2:59 PM CDT	Mesoscale Discussion	SPC	91 min
Apr 12, 2:02 PM CDT	Frost Advisory	OHX	18 hr
Apr 17, 9:30 AM CDT	Mesoscale Discussion	SPC	2 hr
Apr 17, 12:39 PM CDT	Severe Thunderstorm Watch	SPC	5 hr
Apr 17, 3:53 PM CDT	Mesoscale Discussion	SPC	67 min
Apr 18, 2:49 AM CDT	Wind Advisory	OHX	27 hr
Apr 18, 11:43 PM CDT	Special Weather Statement	OHX	2 hr
Apr 19, 12:39 AM CDT	Special Weather Statement	OHX	66 min
Apr 19, 12:55 AM CDT	Severe Thunderstorm Warning	OHX	35 min
Apr 19, 1:37 PM CDT	Frost Advisory	OHX	18 hr
Apr 24, 8:30 AM CDT	Special Weather Statement	OHX	30 min
Apr 24, 3:16 PM CDT	Frost Advisory	OHX	16 hr
Apr 27, 1:13 PM CDT	Flash Flood Warning	OHX	3 hr
Apr 27, 3:06 PM CDT	Flash Flood Watch	OHX	19 hr
Apr 27, 10:51 PM CDT	Areal Flood Advisory	OHX	3 hr
Apr 27, 11:19 PM CDT	Flash Flood Warning	OHX	4 hr
Apr 28, 1:01 AM CDT	River Flood Advisory	OHX	42 hr
Apr 28, 3:01 AM CDT	Areal Flood Warning	OHX	10 hr
Apr 28, 6:43 AM CDT	River Flood Advisory	OHX	6 hr
Apr 28, 6:43 AM CDT	River Flood Advisory	OHX	6 hr
Apr 28, 1:07 PM CDT	River Flood Advisory	OHX	14 hr
Apr 28, 1:07 PM CDT	River Flood Advisory	OHX	24 hr
May 3, 3:45 AM CDT	Flood Watch	OHX	56 hr
May 3, 9:47 AM CDT	Wind Advisory	OHX	12 hr
May 7, 12:46 AM CDT	Dense Fog Advisory	OHX	7 hr
May 12, 3:07 AM CDT	Frost Advisory	OHX	29 hr
May 21, 11:27 AM CDT	Mesoscale Discussion	SPC	63 min
May 21, 12:31 PM CDT	Severe Thunderstorm Warning	OHX	44 min
May 21, 9:24 PM CDT	Special Weather Statement	OHX	21 min
May 21, 9:42 PM CDT	Special Weather Statement	OHX	48 min
May 21, 10:29 PM CDT	Special Weather Statement	OHX	46 min
Jun 1, 1:24 PM CDT	Mesoscale Discussion	SPC	96 min
Jun 1, 2:53 PM CDT	Special Weather Statement	OHX	67 min
Jun 1, 3:58 PM CDT	Special Weather Statement	OHX	47 min
Jun 1, 4:22 PM CDT	Severe Thunderstorm Warning	OHX	23 min
Jun 8, 12:36 AM CDT	Dense Fog Advisory	OHX	8 hr
Jun 9, 5:03 PM CDT	Mesoscale Discussion	SPC	87 min
Jun 9, 7:30 PM CDT	Mesoscale Discussion	SPC	60 min
Jun 10, 1:32 PM CDT	Mesoscale Discussion	SPC	88 min
Jun 10, 1:56 PM CDT	Tornado Watch	SPC	7 hr
Jun 10, 1:59 PM CDT	Severe Thunderstorm Warning	OHX	31 min
Jun 10, 2:30 PM CDT	Special Weather Statement	OHX	45 min
Jun 10, 2:30 PM CDT	Severe Thunderstorm Warning	OHX	45 min
Jun 10, 2:40 PM CDT	Severe Thunderstorm Warning	OHX	35 min
Jun 10, 3:02 PM CDT	Severe Thunderstorm Warning	OHX	28 min
Jun 10, 4:45 PM CDT	Tornado Warning	OHX	30 min
Jun 10, 5:05 PM CDT	Mesoscale Discussion	SPC	85 min
Jun 10, 7:28 PM CDT	Mesoscale Discussion	SPC	62 min
Jun 13, 12:19 PM CDT	Mesoscale Discussion	SPC	26 min
Jun 13, 12:40 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 20, 3:07 PM CDT	Severe Thunderstorm Warning	OHX	38 min
Jun 24, 4:11 PM CDT	Special Weather Statement	OHX	49 min
Jun 24, 4:49 PM CDT	Special Weather Statement	OHX	41 min
Jun 26, 8:56 PM CDT	Mesoscale Discussion	SPC	94 min
Jun 26, 9:55 PM CDT	Severe Thunderstorm Watch	SPC	5 hr
Jun 26, 11:21 PM CDT	Special Weather Statement	OHX	39 min
Jun 26, 11:56 PM CDT	Mesoscale Discussion	SPC	94 min
Jul 3, 2:05 PM CDT	Flash Flood Watch	OHX	4 days
Jul 4, 1:34 PM CDT	Areal Flood Advisory	OHX	6 hr
Jul 5, 1:40 PM CDT	Areal Flood Advisory	OHX	2 hr
Jul 6, 9:56 AM CDT	Areal Flood Advisory	OHX	2 hr
Jul 9, 9:01 PM CDT	Special Weather Statement	OHX	29 min
Jul 10, 7:03 PM CDT	Special Weather Statement	OHX	42 min
Jul 10, 7:10 PM CDT	Areal Flood Advisory	OHX	110 min
Jul 10, 7:16 PM CDT	Severe Thunderstorm Warning	OHX	44 min
Jul 10, 7:43 PM CDT	Severe Thunderstorm Warning	OHX	47 min
Jul 11, 3:00 PM CDT	Special Weather Statement	OHX	30 min
Jul 18, 3:33 PM CDT	Special Weather Statement	OHX	42 min
Jul 20, 8:13 PM CDT	Special Weather Statement	OHX	47 min
Jul 20, 8:51 PM CDT	Special Weather Statement	OHX	39 min
Aug 7, 10:14 AM CDT	Special Weather Statement	OHX	46 min
Aug 8, 11:30 AM CDT	Special Weather Statement	OHX	60 min
Aug 8, 12:23 PM CDT	Areal Flood Advisory	OHX	112 min
Aug 8, 12:29 PM CDT	Special Weather Statement	OHX	46 min
Aug 11, 1:36 PM CDT	Mesoscale Discussion	SPC	54 min
Aug 11, 3:09 PM CDT	Special Weather Statement	OHX	21 min
Aug 11, 3:33 PM CDT	Special Weather Statement	OHX	27 min
Aug 11, 3:39 PM CDT	Areal Flood Advisory	OHX	111 min
Aug 12, 1:15 PM CDT	Flash Flood Watch	OHX	14 hr
Aug 19, 5:09 AM CDT	Dense Fog Advisory	OHX	4 hr
Aug 21, 1:26 PM CDT	Special Weather Statement	OHX	34 min
Aug 23, 5:07 PM CDT	Severe Thunderstorm Warning	OHX	38 min
Sep 26, 1:25 AM CDT	Dense Fog Advisory	OHX	8 hr
Oct 18, 12:55 AM CDT	Dense Fog Advisory	OHX	8 hr
Oct 18, 9:08 AM CDT	Dense Fog Advisory	OHX	112 min
Oct 18, 3:32 PM CDT	Frost Advisory	OHX	39 hr
Oct 20, 3:27 PM CDT	Frost Advisory	OHX	17 hr
Oct 23, 3:07 AM CDT	Freeze Watch	OHX	23 hr
Oct 24, 2:30 AM CDT	Freeze Warning	OHX	31 hr
Oct 25, 3:16 AM CDT	Freeze Warning	OHX	30 hr
Oct 28, 3:00 PM CDT	Dense Fog Advisory	OHX	18 hr
Oct 30, 8:19 PM CDT	Wind Advisory	OHX	29 hr
Oct 31, 7:39 PM CDT	Mesoscale Discussion	SPC	66 min
Oct 31, 7:54 PM CDT	Tornado Watch	SPC	5 hr
Oct 31, 10:28 PM CDT	Special Weather Statement	OHX	62 min
Oct 31, 10:45 PM CDT	Severe Thunderstorm Warning	OHX	45 min
Nov 11, 1:50 PM CST	Wind Advisory	OHX	28 hr
Nov 16, 3:29 PM CST	Wind Advisory	OHX	30 hr
Nov 17, 6:31 PM CST	Mesoscale Discussion	SPC	59 min
Nov 17, 6:58 PM CST	Severe Thunderstorm Watch	SPC	5 hr
Nov 17, 7:29 PM CST	Special Weather Statement	OHX	61 min
Nov 17, 8:02 PM CST	Special Weather Statement	OHX	58 min
Nov 26, 5:01 AM CST	Winter Weather Advisory	OHX	22 hr
Dec 5, 10:47 AM CST	Special Weather Statement	OHX	43 min
Dec 5, 10:54 AM CST	Winter Weather Advisory	OHX	34 hr
Dec 7, 3:41 AM CST	Winter Weather Advisory	OHX	29 hr
Dec 8, 1:28 AM CST	Mesoscale Discussion	SPC	4 hr
Dec 9, 2:36 PM CST	Winter Weather Advisory	OHX	15 hr
Dec 20, 3:23 PM CST	Wind Advisory	OHX	34 hr
Dec 21, 5:46 PM CST	Tornado Watch	SPC	6 hr
Dec 21, 7:40 PM CST	Mesoscale Discussion	SPC	95 min
Dec 21, 8:39 PM CST	Severe Thunderstorm Warning	OHX	36 min
Dec 21, 8:42 PM CST	Tornado Warning	OHX	33 min
Dec 21, 8:51 PM CST	Tornado Warning	OHX	24 min
Dec 21, 9:05 PM CST	Severe Thunderstorm Warning	OHX	40 min
Dec 21, 9:37 PM CST	Severe Thunderstorm Warning	OHX	38 min
Dec 21, 10:12 PM CST	Tornado Warning	OHX	33 min
Dec 21, 10:33 PM CST	Mesoscale Discussion	SPC	87 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	22
Tornado Warning	9
Severe Thunderstorm Watch	5
Tornado Watch	4
Mesoscale Discussion	26
Special Weather Statement	35
Flooding
Areal Flood Warning	3
Flash Flood Warning	5
Flash Flood Watch	4
Flood Watch	1
Areal Flood Advisory	7
River Flood Advisory	5
Winter
Ice Storm Warning	1
Winter Weather Advisory	7
Cold
Freeze Warning	2
Freeze Watch	1
Frost Advisory	6
Wind and dust
Wind Advisory	14
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 2012 2014

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.