Alert archive / Texas / Nacogdoches County

Weather alerts in Nacogdoches County, Texas, 2009

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

Nacogdoches County and its neighbors

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

Alerts: 182
Warnings: 55
Watches: 33
Advisories: 52
Busiest month: April38 alerts
Busiest day: December 24, 200914 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 6 tornado warnings covering Nacogdoches County in 2009 had a tornado report inside them; 4 of 4 tornado reports fell inside a warning, on average 23 minutes after it went out.

Nacogdoches County, 2009

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	6	2	67%	4	100%	23 min
Severe thunderstorm warnings	24	11	54%	7	100%	27 min
Flash flood warnings	5	5	0%	2	100%	42 min

Each office's whole area, 2009

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Shreveport, LA: tornado warnings	131	51	61%	134	60%	18 min
NWS Shreveport, LA: severe thunderstorm warnings	390	173	56%	463	76%	24 min
NWS Shreveport, LA: flash flood warnings	126	102	19%	356	92%	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
Jan 10, 4:00 AM CST	Lake Wind Advisory	SHV	14 hr
Jan 19, 3:03 AM CST	Lake Wind Advisory	SHV	13 hr
Jan 20, 3:48 AM CST	Lake Wind Advisory	SHV	12 hr
Jan 23, 11:16 AM CST	Lake Wind Advisory	SHV	5 hr
Jan 27, 3:59 AM CST	Ice Storm Warning	SHV	25 hr
Jan 27, 8:55 PM CST	Winter Weather Advisory	SHV	10 hr
Feb 1, 10:30 PM CST	Mesoscale Discussion	SPC	90 min
Feb 6, 4:49 AM CST	Lake Wind Advisory	SHV	13 hr
Feb 8, 9:38 PM CST	Lake Wind Advisory	SHV	20 hr
Feb 10, 3:50 PM CST	Lake Wind Advisory	SHV	14 hr
Feb 10, 9:30 PM CST	Tornado Watch	SPC	7 hr
Feb 10, 11:49 PM CST	Severe Thunderstorm Warning	SHV	56 min
Feb 11, 12:40 AM CST	Severe Thunderstorm Warning	SHV	65 min
Feb 11, 12:42 AM CST	Severe Thunderstorm Warning	SHV	48 min
Feb 11, 10:55 AM CST	Lake Wind Advisory	SHV	5 hr
Feb 21, 4:55 AM CST	Lake Wind Advisory	SHV	11 hr
Feb 26, 3:34 AM CST	Lake Wind Advisory	SHV	12 hr
Feb 28, 5:11 AM CST	Lake Wind Advisory	SHV	16 hr
Mar 4, 3:36 PM CST	Lake Wind Advisory	SHV	26 hr
Mar 6, 5:55 AM CST	Lake Wind Advisory	SHV	12 hr
Mar 7, 4:40 AM CST	Lake Wind Advisory	SHV	13 hr
Mar 14, 6:34 AM CDT	River Flood Warning	SHV	3 days
Mar 21, 10:56 AM CDT	River Flood Warning	SHV	19 days
Mar 22, 9:38 PM CDT	Lake Wind Advisory	SHV	23 hr
Mar 23, 9:53 PM CDT	Lake Wind Advisory	SHV	21 hr
Mar 24, 7:30 PM CDT	Mesoscale Discussion	SPC	2 hr
Mar 25, 5:29 PM CDT	Mesoscale Discussion	SPC	91 min
Mar 25, 5:40 PM CDT	Tornado Watch	SPC	6 hr
Mar 25, 6:34 PM CDT	Severe Thunderstorm Warning	SHV	26 min
Mar 25, 7:07 PM CDT	Tornado Warning	SHV	23 min
Mar 26, 4:40 AM CDT	Dense Fog Advisory	SHV	5 hr
Mar 26, 10:27 AM CDT	River Flood Warning	SHV	23 hr
Mar 26, 3:57 PM CDT	Tornado Watch	SPC	7 hr
Mar 26, 6:56 PM CDT	Mesoscale Discussion	SPC	94 min
Mar 26, 9:13 PM CDT	Mesoscale Discussion	SPC	92 min
Mar 27, 10:24 AM CDT	Mesoscale Discussion	SPC	96 min
Mar 27, 12:58 PM CDT	Tornado Watch	SPC	7 hr
Mar 27, 3:34 PM CDT	Mesoscale Discussion	SPC	56 min
Mar 27, 6:35 PM CDT	Tornado Watch	SPC	7 hr
Mar 27, 9:21 PM CDT	Lake Wind Advisory	SHV	22 hr
Mar 28, 9:06 PM CDT	River Flood Warning	SHV	7 days
Mar 29, 3:28 PM CDT	Lake Wind Advisory	SHV	28 hr
Mar 31, 3:57 AM CDT	Severe Thunderstorm Warning	SHV	48 min
Mar 31, 6:26 AM CDT	Severe Thunderstorm Warning	SHV	49 min
Apr 1, 2:54 PM CDT	Lake Wind Advisory	SHV	31 hr
Apr 2, 1:32 AM CDT	Mesoscale Discussion	SPC	58 min
Apr 2, 4:43 AM CDT	Severe Thunderstorm Watch	SPC	6 hr
Apr 2, 7:36 AM CDT	Mesoscale Discussion	SPC	54 min
Apr 5, 3:22 AM CDT	Lake Wind Advisory	SHV	16 hr
Apr 6, 3:49 AM CDT	Freeze Warning	SHV	29 hr
Apr 6, 3:49 AM CDT	Lake Wind Advisory	SHV	18 hr
Apr 8, 3:46 PM CDT	Lake Wind Advisory	SHV	28 hr
Apr 12, 9:13 AM CDT	Severe Thunderstorm Warning	SHV	47 min
Apr 12, 9:19 AM CDT	Mesoscale Discussion	SPC	56 min
Apr 12, 9:30 AM CDT	Severe Thunderstorm Watch	SPC	7 hr
Apr 12, 9:47 AM CDT	Severe Thunderstorm Warning	SHV	43 min
Apr 12, 11:03 AM CDT	Severe Thunderstorm Warning	SHV	42 min
Apr 12, 11:21 AM CDT	Tornado Warning	SHV	24 min
Apr 12, 2:08 PM CDT	Severe Thunderstorm Warning	SHV	37 min
Apr 13, 4:04 AM CDT	Dense Fog Advisory	SHV	4 hr
Apr 16, 3:35 PM CDT	Flash Flood Watch	SHV	54 hr
Apr 16, 7:43 PM CDT	Mesoscale Discussion	SPC	62 min
Apr 17, 12:10 PM CDT	Mesoscale Discussion	SPC	3 hr
Apr 18, 9:47 AM CDT	Mesoscale Discussion	SPC	28 min
Apr 18, 9:53 AM CDT	Tornado Watch	SPC	6 hr
Apr 18, 11:25 AM CDT	River Flood Warning	SHV	69 hr
Apr 18, 11:25 AM CDT	River Flood Warning	SHV	46 hr
Apr 18, 11:26 AM CDT	Mesoscale Discussion	SPC	2 hr
Apr 18, 12:35 PM CDT	Areal Flood Advisory	SHV	3 hr
Apr 18, 1:43 PM CDT	Mesoscale Discussion	SPC	92 min
Apr 18, 10:51 PM CDT	River Flood Warning	SHV	7 days
Apr 23, 3:21 AM CDT	Lake Wind Advisory	SHV	15 hr
Apr 24, 3:26 AM CDT	Lake Wind Advisory	SHV	16 hr
Apr 25, 3:48 AM CDT	Lake Wind Advisory	SHV	11 hr
Apr 25, 3:15 PM CDT	Lake Wind Advisory	SHV	28 hr
Apr 27, 8:59 AM CDT	Mesoscale Discussion	SPC	91 min
Apr 27, 9:28 AM CDT	Severe Thunderstorm Watch	SPC	12 hr
Apr 27, 1:14 PM CDT	Mesoscale Discussion	SPC	91 min
Apr 27, 2:24 PM CDT	Mesoscale Discussion	SPC	66 min
Apr 27, 7:19 PM CDT	Areal Flood Advisory	SHV	3 hr
Apr 27, 8:12 PM CDT	Flash Flood Warning	SHV	3 hr
Apr 28, 9:17 PM CDT	River Flood Warning	SHV	36 hr
May 2, 5:27 AM CDT	Flash Flood Watch	SHV	34 hr
May 2, 3:04 PM CDT	Mesoscale Discussion	SPC	26 min
May 3, 2:39 AM CDT	Mesoscale Discussion	SPC	2 hr
May 3, 5:12 AM CDT	Severe Thunderstorm Watch	SPC	7 hr
May 3, 6:13 AM CDT	Severe Thunderstorm Warning	SHV	62 min
May 3, 6:52 AM CDT	Severe Thunderstorm Warning	SHV	53 min
May 3, 6:54 AM CDT	Mesoscale Discussion	SPC	2 hr
May 6, 5:29 AM CDT	Severe Thunderstorm Watch	SPC	8 hr
May 8, 3:45 AM CDT	Lake Wind Advisory	SHV	15 hr
May 11, 1:05 PM CDT	Mesoscale Discussion	SPC	85 min
May 13, 4:30 AM CDT	Lake Wind Advisory	SHV	15 hr
May 26, 1:46 PM CDT	Severe Thunderstorm Warning	SHV	44 min
Jun 3, 1:20 PM CDT	Mesoscale Discussion	SPC	55 min
Jun 3, 3:37 PM CDT	Severe Thunderstorm Warning	SHV	38 min
Jun 10, 10:25 PM CDT	Severe Thunderstorm Warning	SHV	65 min
Jun 10, 11:07 PM CDT	Mesoscale Discussion	SPC	83 min
Jun 10, 11:49 PM CDT	Severe Thunderstorm Watch	SPC	5 hr
Jun 11, 3:11 AM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 11, 5:22 AM CDT	Mesoscale Discussion	SPC	53 min
Jun 11, 10:10 AM CDT	Severe Thunderstorm Watch	SPC	8 hr
Jun 11, 1:10 PM CDT	Mesoscale Discussion	SPC	65 min
Jun 24, 3:43 AM CDT	Heat Advisory	SHV	15 hr
Jun 25, 4:38 AM CDT	Heat Advisory	SHV	14 hr
Jun 26, 9:58 PM CDT	Heat Advisory	SHV	21 hr
Jul 2, 4:11 PM CDT	Heat Advisory	SHV	53 hr
Jul 5, 4:34 PM CDT	Mesoscale Discussion	SPC	26 min
Jul 5, 4:57 PM CDT	Severe Thunderstorm Watch	SPC	5 hr
Jul 5, 6:19 PM CDT	Severe Thunderstorm Warning	SHV	26 min
Jul 5, 6:46 PM CDT	Severe Thunderstorm Warning	SHV	59 min
Jul 5, 7:22 PM CDT	Mesoscale Discussion	SPC	53 min
Jul 9, 5:10 AM CDT	Heat Advisory	SHV	8 days
Jul 18, 12:21 PM CDT	Severe Thunderstorm Warning	SHV	39 min
Jul 19, 2:36 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jul 21, 9:33 PM CDT	Severe Thunderstorm Warning	SHV	31 min
Jul 26, 9:45 AM CDT	Mesoscale Discussion	SPC	2 hr
Jul 27, 3:36 PM CDT	Flash Flood Watch	SHV	29 hr
Jul 29, 4:32 PM CDT	Flash Flood Watch	SHV	32 hr
Jul 30, 6:40 AM CDT	Mesoscale Discussion	SPC	95 min
Aug 1, 9:08 PM CDT	Areal Flood Advisory	SHV	3 hr
Aug 6, 12:49 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Aug 26, 10:07 AM CDT	Mesoscale Discussion	SPC	83 min
Aug 26, 5:47 PM CDT	Severe Thunderstorm Warning	SHV	43 min
Sep 11, 3:25 PM CDT	Flash Flood Watch	SHV	43 hr
Oct 1, 6:29 PM CDT	Severe Thunderstorm Watch	SPC	8 hr
Oct 7, 9:29 PM CDT	Lake Wind Advisory	SHV	20 hr
Oct 9, 6:59 AM CDT	Mesoscale Discussion	SPC	3 hr
Oct 13, 3:39 PM CDT	Areal Flood Advisory	SHV	111 min
Oct 13, 5:56 PM CDT	Areal Flood Advisory	SHV	3 hr
Oct 14, 2:40 AM CDT	River Flood Warning	SHV	19 hr
Oct 15, 5:55 AM CDT	Flash Flood Watch	SHV	10 hr
Oct 21, 3:51 PM CDT	Flash Flood Watch	SHV	24 hr
Oct 22, 5:55 AM CDT	Tornado Watch	SPC	6 hr
Oct 22, 7:48 AM CDT	Mesoscale Discussion	SPC	117 min
Oct 22, 8:24 AM CDT	Areal Flood Advisory	SHV	4 hr
Oct 23, 9:04 PM CDT	River Flood Warning	SHV	17 days
Oct 25, 3:22 PM CDT	Flash Flood Watch	SHV	36 hr
Oct 28, 4:38 AM CDT	Dense Fog Advisory	SHV	4 hr
Oct 28, 3:37 PM CDT	Flash Flood Watch	SHV	48 hr
Oct 29, 3:41 AM CDT	Lake Wind Advisory	SHV	15 hr
Oct 29, 10:48 AM CDT	Mesoscale Discussion	SPC	117 min
Oct 29, 1:14 PM CDT	Tornado Watch	SPC	8 hr
Oct 29, 3:03 PM CDT	Mesoscale Discussion	SPC	117 min
Oct 29, 4:10 PM CDT	Severe Thunderstorm Warning	SHV	50 min
Oct 29, 4:28 PM CDT	Tornado Warning	SHV	47 min
Oct 29, 5:14 PM CDT	Severe Thunderstorm Warning	SHV	46 min
Oct 29, 5:15 PM CDT	Flash Flood Warning	SHV	4 hr
Oct 29, 5:24 PM CDT	Mesoscale Discussion	SPC	66 min
Oct 29, 8:36 PM CDT	Flash Flood Warning	SHV	4 hr
Oct 29, 9:23 PM CDT	River Flood Warning	SHV	5 days
Oct 30, 12:31 AM CDT	Flash Flood Warning	SHV	4 hr
Oct 30, 4:32 AM CDT	Areal Flood Warning	SHV	4 hr
Dec 2, 4:34 AM CST	Freeze Warning	SHV	27 hr
Dec 2, 4:34 AM CST	Lake Wind Advisory	SHV	13 hr
Dec 3, 3:24 AM CST	Freeze Warning	SHV	24 hr
Dec 3, 10:02 PM CST	Winter Weather Advisory	SHV	22 hr
Dec 4, 11:03 AM CST	Freeze Warning	SHV	22 hr
Dec 9, 4:43 AM CST	Lake Wind Advisory	SHV	11 hr
Dec 12, 3:13 PM CST	Dense Fog Advisory	SHV	18 hr
Dec 13, 2:54 PM CST	Dense Fog Advisory	SHV	16 hr
Dec 23, 2:37 AM CST	Mesoscale Discussion	SPC	2 hr
Dec 23, 3:44 AM CST	Flash Flood Watch	SHV	29 hr
Dec 23, 1:03 PM CST	Mesoscale Discussion	SPC	57 min
Dec 23, 1:59 PM CST	Tornado Watch	SPC	7 hr
Dec 23, 2:20 PM CST	Lake Wind Advisory	SHV	38 hr
Dec 23, 5:21 PM CST	Mesoscale Discussion	SPC	114 min
Dec 23, 6:36 PM CST	Severe Thunderstorm Warning	SHV	24 min
Dec 23, 7:50 PM CST	Mesoscale Discussion	SPC	85 min
Dec 23, 8:48 PM CST	Tornado Watch	SPC	9 hr
Dec 23, 10:13 PM CST	Severe Thunderstorm Warning	SHV	47 min
Dec 23, 10:26 PM CST	Tornado Warning	SHV	49 min
Dec 23, 11:06 PM CST	Mesoscale Discussion	SPC	114 min
Dec 23, 11:09 PM CST	Tornado Warning	SHV	51 min
Dec 23, 11:51 PM CST	Tornado Warning	SHV	39 min
Dec 24, 12:15 AM CST	Flash Flood Warning	SHV	3 hr
Dec 24, 3:30 AM CST	Mesoscale Discussion	SPC	2 hr
Dec 24, 4:50 AM CST	Tornado Watch	SPC	7 hr
Dec 24, 6:42 AM CST	River Flood Warning	SHV	10 days
Dec 24, 9:44 AM CST	River Flood Warning	SHV	49 hr
Dec 24, 9:49 AM CST	River Flood Warning	SHV	25 hr
Dec 31, 4:54 AM CST	Dense Fog Advisory	SHV	5 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	24
Tornado Warning	6
Severe Thunderstorm Watch	12
Tornado Watch	11
Mesoscale Discussion	42
Flooding
Areal Flood Warning	1
Flash Flood Warning	5
River Flood Warning	14
Flash Flood Watch	10
Areal Flood Advisory	6
Winter
Ice Storm Warning	1
Winter Weather Advisory	2
Heat
Heat Advisory	5
Cold
Freeze Warning	4
Wind and dust
Lake Wind Advisory	33
Fog and smoke
Dense Fog Advisory	6

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.