Alert archive / Tennessee / Henderson County

Weather alerts in Henderson County, Tennessee, 2009

173 weather alerts in 2009, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Henderson County and its neighbors

Each county as a circle sized by its count in 2009. Tap one for its archive.

Alerts: 173
Warnings: 48
Watches: 36
Advisories: 43
Busiest month: July38 alerts
Busiest day: June 15, 200912 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 5 tornado warnings covering Henderson County in 2009 had a tornado report inside them; 3 of 4 tornado reports fell inside a warning, on average 9 minutes after it went out.

Henderson County, 2009

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	5	1	80%	4	75%	9 min
Severe thunderstorm warnings	19	15	21%	6	83%	20 min
Flash flood warnings	17	9	47%	1	100%	40 min

Each office's whole area, 2009

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Memphis, TN: tornado warnings	69	19	72%	51	65%	19 min
NWS Memphis, TN: severe thunderstorm warnings	439	207	53%	423	82%	24 min
NWS Memphis, TN: flash flood warnings	235	126	46%	204	92%	94 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 5, 8:50 AM CST	Winter Weather Advisory	MEG	7 hr
Jan 5, 3:30 PM CST	Winter Weather Advisory	MEG	20 hr
Jan 15, 4:48 AM CST	Wind Chill Advisory	MEG	28 hr
Jan 26, 4:19 AM CST	Freezing Rain Advisory	MEG	48 hr
Jan 27, 11:31 PM CST	Mesoscale Discussion	SPC	5 hr
Jan 28, 4:32 AM CST	Winter Weather Advisory	MEG	5 hr
Feb 10, 3:31 AM CST	Wind Advisory	MEG	39 hr
Feb 17, 9:45 PM CST	Mesoscale Discussion	SPC	2 hr
Feb 27, 9:33 PM CST	Winter Storm Watch	MEG	6 hr
Feb 28, 3:59 AM CST	Winter Storm Warning	MEG	28 hr
Feb 28, 3:57 PM CST	Mesoscale Discussion	SPC	4 hr
Mar 8, 3:41 AM CDT	Wind Advisory	MEG	15 hr
Mar 11, 3:53 AM CDT	Winter Storm Watch	MEG	11 hr
Mar 11, 3:53 AM CDT	Winter Weather Advisory	MEG	42 hr
Mar 12, 3:36 AM CDT	Winter Storm Warning	MEG	11 hr
Mar 15, 3:56 AM CDT	Dense Fog Advisory	MEG	6 hr
Mar 16, 9:39 PM CDT	Dense Fog Advisory	MEG	12 hr
Mar 17, 11:27 PM CDT	Dense Fog Advisory	MEG	10 hr
Mar 27, 3:11 PM CDT	Flash Flood Watch	MEG	14 hr
Mar 29, 4:41 AM CDT	Frost Advisory	MEG	28 hr
Apr 2, 2:57 PM CDT	Flash Flood Warning	MEG	3 hr
Apr 2, 3:05 PM CDT	Wind Advisory	MEG	10 hr
Apr 2, 5:36 PM CDT	Mesoscale Discussion	SPC	84 min
Apr 2, 6:21 PM CDT	Tornado Watch	SPC	3 hr
Apr 5, 4:05 AM CDT	Freeze Watch	MEG	24 hr
Apr 5, 4:05 AM CDT	Wind Advisory	MEG	24 hr
Apr 6, 3:52 AM CDT	Freeze Warning	MEG	27 hr
Apr 7, 3:58 AM CDT	Freeze Warning	MEG	27 hr
Apr 10, 12:50 AM CDT	Mesoscale Discussion	SPC	85 min
Apr 10, 1:22 AM CDT	Severe Thunderstorm Watch	SPC	4 hr
Apr 10, 8:22 AM CDT	Mesoscale Discussion	SPC	83 min
Apr 10, 8:53 AM CDT	Tornado Watch	SPC	7 hr
Apr 10, 10:22 AM CDT	Severe Thunderstorm Warning	MEG	38 min
Apr 10, 10:36 AM CDT	Severe Thunderstorm Warning	MEG	54 min
Apr 10, 11:14 AM CDT	Mesoscale Discussion	SPC	76 min
Apr 10, 1:13 PM CDT	Wind Advisory	MEG	6 hr
Apr 13, 12:09 PM CDT	Mesoscale Discussion	SPC	66 min
Apr 19, 1:17 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Apr 19, 2:22 PM CDT	Mesoscale Discussion	SPC	53 min
Apr 19, 3:49 PM CDT	Mesoscale Discussion	SPC	56 min
Apr 19, 5:47 PM CDT	Mesoscale Discussion	SPC	58 min
Apr 30, 3:34 PM CDT	Mesoscale Discussion	SPC	86 min
May 1, 1:18 PM CDT	Mesoscale Discussion	SPC	87 min
May 1, 2:24 PM CDT	Flash Flood Warning	MEG	3 hr
May 1, 3:21 PM CDT	Mesoscale Discussion	SPC	54 min
May 1, 3:36 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
May 1, 3:40 PM CDT	Flash Flood Watch	MEG	55 hr
May 1, 5:23 PM CDT	Flash Flood Warning	MEG	3 hr
May 1, 6:11 PM CDT	Mesoscale Discussion	SPC	64 min
May 2, 1:44 AM CDT	Areal Flood Advisory	MEG	3 hr
May 2, 2:49 AM CDT	Flash Flood Warning	MEG	3 hr
May 3, 4:40 PM CDT	Flash Flood Warning	MEG	6 hr
May 3, 6:47 PM CDT	Flash Flood Warning	MEG	4 hr
May 5, 4:13 AM CDT	Flash Flood Watch	MEG	35 hr
May 5, 10:27 PM CDT	Severe Thunderstorm Watch	SPC	8 hr
May 6, 2:26 AM CDT	Mesoscale Discussion	SPC	2 hr
May 7, 5:18 AM CDT	Dense Fog Advisory	MEG	4 hr
May 8, 8:37 AM CDT	Mesoscale Discussion	SPC	53 min
May 8, 9:21 AM CDT	Tornado Watch	SPC	7 hr
May 8, 2:16 PM CDT	Mesoscale Discussion	SPC	89 min
May 8, 3:24 PM CDT	Mesoscale Discussion	SPC	66 min
May 8, 3:42 PM CDT	Tornado Watch	SPC	7 hr
May 8, 7:30 PM CDT	Mesoscale Discussion	SPC	90 min
May 8, 8:29 PM CDT	Flash Flood Watch	MEG	47 hr
May 9, 1:55 AM CDT	Severe Thunderstorm Warning	MEG	50 min
May 9, 2:22 AM CDT	Mesoscale Discussion	SPC	53 min
May 15, 4:03 PM CDT	Flash Flood Watch	MEG	27 hr
Jun 10, 1:12 AM CDT	Mesoscale Discussion	SPC	33 min
Jun 10, 9:04 AM CDT	Mesoscale Discussion	SPC	86 min
Jun 11, 2:38 AM CDT	Mesoscale Discussion	SPC	67 min
Jun 12, 11:35 AM CDT	Severe Thunderstorm Watch PDS	SPC	9 hr
Jun 12, 5:24 PM CDT	Mesoscale Discussion	SPC	96 min
Jun 15, 9:59 AM CDT	Mesoscale Discussion	SPC	31 min
Jun 15, 10:34 AM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 15, 1:56 PM CDT	Mesoscale Discussion	SPC	64 min
Jun 15, 2:48 PM CDT	Tornado Watch	SPC	3 hr
Jun 15, 3:21 PM CDT	Severe Thunderstorm Warning	MEG	39 min
Jun 15, 3:52 PM CDT	Mesoscale Discussion	SPC	53 min
Jun 15, 3:54 PM CDT	Severe Thunderstorm Warning	MEG	49 min
Jun 15, 4:07 PM CDT	Tornado Warning	MEG	53 min
Jun 15, 4:08 PM CDT	Flash Flood Warning	MEG	3 hr
Jun 15, 4:10 PM CDT	Tornado Warning	MEG	50 min
Jun 15, 4:57 PM CDT	Mesoscale Discussion	SPC	63 min
Jun 15, 5:35 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 16, 9:38 AM CDT	Mesoscale Discussion	SPC	67 min
Jun 16, 10:40 AM CDT	Severe Thunderstorm Watch	SPC	5 hr
Jun 16, 1:10 PM CDT	Mesoscale Discussion	SPC	35 min
Jun 17, 3:12 PM CDT	Heat Advisory	MEG	5 days
Jun 23, 3:26 AM CDT	Heat Advisory	MEG	16 hr
Jun 26, 3:17 AM CDT	Heat Advisory	MEG	61 hr
Jun 26, 2:34 PM CDT	Mesoscale Discussion	SPC	86 min
Jun 27, 4:54 PM CDT	Severe Thunderstorm Warning	MEG	51 min
Jul 4, 5:27 PM CDT	Mesoscale Discussion	SPC	63 min
Jul 4, 8:02 PM CDT	Mesoscale Discussion	SPC	28 min
Jul 4, 11:19 PM CDT	Flash Flood Warning	MEG	4 hr
Jul 5, 12:26 AM CDT	Severe Thunderstorm Warning	MEG	49 min
Jul 5, 12:33 AM CDT	Tornado Warning	MEG	42 min
Jul 5, 1:01 AM CDT	Mesoscale Discussion	SPC	3 hr
Jul 5, 1:12 AM CDT	Severe Thunderstorm Warning	MEG	48 min
Jul 5, 2:58 AM CDT	Flash Flood Warning	MEG	63 min
Jul 5, 1:21 PM CDT	Mesoscale Discussion	SPC	54 min
Jul 5, 3:07 PM CDT	Areal Flood Advisory	MEG	113 min
Jul 12, 10:32 PM CDT	Severe Thunderstorm Warning	MEG	43 min
Jul 15, 1:36 PM CDT	Mesoscale Discussion	SPC	84 min
Jul 15, 6:03 PM CDT	Severe Thunderstorm Watch	SPC	5 hr
Jul 15, 6:14 PM CDT	Severe Thunderstorm Warning	MEG	46 min
Jul 15, 6:19 PM CDT	Flash Flood Warning	MEG	6 hr
Jul 15, 7:35 PM CDT	Severe Thunderstorm Warning	MEG	55 min
Jul 15, 7:43 PM CDT	Severe Thunderstorm Warning	MEG	43 min
Jul 15, 7:49 PM CDT	Mesoscale Discussion	SPC	56 min
Jul 15, 8:16 PM CDT	Severe Thunderstorm Warning	MEG	23 min
Jul 15, 8:25 PM CDT	Severe Thunderstorm Warning	MEG	65 min
Jul 16, 7:52 AM CDT	Areal Flood Advisory	MEG	2 hr
Jul 21, 10:06 AM CDT	Flash Flood Watch	MEG	17 hr
Jul 23, 3:17 AM CDT	Dense Fog Advisory	MEG	6 hr
Jul 26, 2:25 AM CDT	Mesoscale Discussion	SPC	95 min
Jul 26, 4:53 AM CDT	Areal Flood Advisory	MEG	58 min
Jul 28, 3:32 AM CDT	Flash Flood Watch	MEG	15 hr
Jul 28, 6:07 AM CDT	Areal Flood Advisory	MEG	3 hr
Jul 29, 3:13 PM CDT	Flash Flood Watch	MEG	37 hr
Jul 29, 6:35 PM CDT	Flash Flood Warning	MEG	3 hr
Jul 30, 4:10 PM CDT	Tornado Watch	SPC	6 hr
Jul 30, 5:01 PM CDT	Mesoscale Discussion	SPC	59 min
Jul 30, 6:12 PM CDT	Flash Flood Warning	MEG	3 hr
Jul 30, 6:29 PM CDT	Mesoscale Discussion	SPC	61 min
Jul 30, 7:05 PM CDT	Severe Thunderstorm Warning	MEG	70 min
Jul 30, 7:29 PM CDT	Severe Thunderstorm Warning	MEG	61 min
Jul 30, 7:42 PM CDT	Mesoscale Discussion	SPC	63 min
Jul 30, 7:43 PM CDT	Tornado Warning	MEG	47 min
Jul 30, 9:16 PM CDT	Flash Flood Warning	MEG	119 min
Aug 1, 7:33 AM CDT	Flash Flood Watch	MEG	14 hr
Aug 1, 1:53 PM CDT	Flash Flood Warning	MEG	3 hr
Aug 4, 6:21 PM CDT	Mesoscale Discussion	SPC	114 min
Aug 4, 6:34 PM CDT	Severe Thunderstorm Watch	SPC	4 hr
Aug 4, 8:09 PM CDT	Severe Thunderstorm Warning	MEG	66 min
Aug 4, 8:35 PM CDT	Mesoscale Discussion	SPC	85 min
Aug 4, 9:36 PM CDT	Mesoscale Discussion	SPC	2 hr
Aug 4, 10:14 PM CDT	Tornado Warning	MEG	46 min
Aug 4, 10:39 PM CDT	Severe Thunderstorm Warning	MEG	51 min
Aug 5, 11:40 PM CDT	Dense Fog Advisory	MEG	9 hr
Aug 11, 8:04 AM CDT	Flash Flood Warning	MEG	3 hr
Aug 11, 8:23 PM CDT	Areal Flood Advisory	MEG	65 min
Aug 12, 3:32 AM CDT	Dense Fog Advisory	MEG	4 hr
Sep 3, 6:02 AM CDT	Dense Fog Advisory	MEG	3 hr
Sep 6, 6:16 PM CDT	Severe Thunderstorm Warning	MEG	44 min
Sep 8, 4:25 PM CDT	Flash Flood Warning	MEG	75 min
Sep 15, 4:15 AM CDT	Flash Flood Watch	MEG	4 days
Sep 20, 11:14 AM CDT	Flash Flood Watch	MEG	8 hr
Sep 22, 3:20 PM CDT	Areal Flood Advisory	MEG	85 min
Sep 23, 4:30 PM CDT	Areal Flood Advisory	MEG	3 hr
Sep 26, 3:30 PM CDT	Dense Fog Advisory	MEG	16 hr
Oct 7, 3:50 PM CDT	Flash Flood Watch	MEG	48 hr
Oct 9, 2:38 AM CDT	Mesoscale Discussion	SPC	52 min
Oct 15, 3:30 AM CDT	Dense Fog Advisory	MEG	3 hr
Oct 16, 8:58 PM CDT	Freeze Watch	MEG	19 hr
Oct 17, 3:40 PM CDT	Frost Advisory	MEG	17 hr
Oct 18, 3:56 AM CDT	Frost Advisory	MEG	29 hr
Oct 18, 3:33 PM CDT	Freeze Warning	MEG	17 hr
Oct 24, 3:58 AM CDT	Frost Advisory	MEG	17 hr
Oct 28, 3:48 AM CDT	Flash Flood Watch	MEG	63 hr
Nov 1, 3:25 AM CST	Frost Advisory	MEG	29 hr
Nov 2, 3:23 AM CST	Freeze Watch	MEG	36 hr
Nov 3, 3:43 PM CST	Freeze Warning	MEG	16 hr
Nov 5, 3:26 PM CST	Freeze Warning	MEG	16 hr
Dec 8, 11:00 AM CST	Areal Flood Advisory	MEG	2 hr
Dec 8, 2:34 PM CST	Flash Flood Warning	MEG	4 hr
Dec 8, 3:31 PM CST	Flash Flood Watch	MEG	8 hr
Dec 9, 5:53 AM CST	Wind Advisory	MEG	6 hr
Dec 21, 9:05 PM CST	Freezing Fog Advisory	MEG	11 hr
Dec 22, 8:19 AM CST	Freezing Fog Advisory	MEG	41 min
Dec 23, 3:32 PM CST	High Wind Watch	MEG	24 hr
Dec 23, 3:32 PM CST	Wind Advisory	MEG	44 hr
Dec 24, 6:53 PM CST	Areal Flood Advisory	MEG	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	19
Tornado Warning	5
Severe Thunderstorm Watch	10
Tornado Watch	6
Mesoscale Discussion	46
Flooding
Flash Flood Warning	17
Flash Flood Watch	14
Areal Flood Advisory	10
Winter
Winter Storm Warning	2
Winter Storm Watch	2
Freezing Rain Advisory	1
Winter Weather Advisory	4
Heat
Heat Advisory	3
Cold
Freeze Warning	5
Freeze Watch	3
Frost Advisory	5
Wind Chill Advisory	1
Wind and dust
High Wind Watch	1
Wind Advisory	7
Fog and smoke
Dense Fog Advisory	10
Freezing Fog Advisory	2

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2008 2010

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.