Alert archive / Texas / Galveston County

Weather alerts in Galveston County, Texas, 2009

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

Galveston County and its neighbors

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

Alerts: 148
Warnings: 49
Watches: 29
Advisories: 43
Busiest month: April50 alerts
Busiest day: April 18, 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.

1 of 3 tornado warnings covering Galveston County in 2009 had a tornado report inside them; 3 of 5 tornado reports fell inside a warning, on average 1 minutes after it went out.

Galveston County, 2009

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	3	1	67%	5	60%	1 min
Severe thunderstorm warnings	17	7	59%	5	60%	12 min
Flash flood warnings	10	4	60%	9	100%	97 min

Each office's whole area, 2009

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Houston/Galveston, TX: tornado warnings	46	5	89%	16	56%	7 min
NWS Houston/Galveston, TX: severe thunderstorm warnings	221	57	74%	129	76%	19 min
NWS Houston/Galveston, TX: flash flood warnings	41	16	61%	56	86%	74 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, 4:04 AM CST	Dense Fog Advisory	HGX	8 hr
Jan 4, 4:17 AM CST	Dense Fog Advisory	HGX	5 hr
Jan 13, 9:35 AM CST	Red Flag Warning	HGX	8 hr
Jan 13, 8:56 PM CST	Freeze Warning	HGX	11 hr
Jan 18, 3:42 PM CST	Fire Weather Watch	HGX	6 hr
Jan 18, 9:20 PM CST	Red Flag Warning	HGX	21 hr
Jan 19, 7:04 AM CST	Fire Weather Watch	HGX	22 hr
Jan 20, 5:27 AM CST	Red Flag Warning	HGX	13 hr
Feb 1, 2:24 PM CST	Severe Thunderstorm Warning	HGX	42 min
Feb 1, 3:12 PM CST	Red Flag Warning	HGX	24 hr
Feb 1, 11:55 PM CST	Dense Fog Advisory	HGX	3 hr
Feb 10, 4:22 AM CST	Fire Weather Watch	HGX	24 hr
Feb 10, 9:57 PM CST	Severe Thunderstorm Watch	SPC	5 hr
Feb 18, 3:09 PM CST	Fire Weather Watch	HGX	15 hr
Feb 22, 7:31 AM CST	Red Flag Warning	HGX	11 hr
Feb 27, 2:59 PM CST	Red Flag Warning	HGX	27 hr
Feb 27, 8:11 PM CST	Wind Advisory	HGX	25 hr
Feb 28, 2:57 PM CST	Red Flag Warning	HGX	27 hr
Mar 16, 8:10 PM CDT	Dense Fog Advisory	HGX	14 hr
Mar 17, 8:04 PM CDT	Dense Fog Advisory	HGX	14 hr
Mar 18, 8:31 PM CDT	Dense Fog Advisory	HGX	14 hr
Mar 19, 9:20 PM CDT	Dense Fog Advisory	HGX	9 hr
Mar 25, 7:12 PM CDT	Tornado Watch	SPC	6 hr
Mar 26, 12:57 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Mar 26, 3:51 PM CDT	Mesoscale Discussion	SPC	54 min
Mar 27, 4:49 PM CDT	Tornado Watch	SPC	3 hr
Mar 28, 1:10 AM CDT	Wind Advisory	HGX	4 hr
Apr 1, 3:13 PM CDT	Fire Weather Watch	HGX	17 hr
Apr 2, 1:49 AM CDT	Severe Thunderstorm Watch	SPC	7 hr
Apr 2, 7:47 AM CDT	Red Flag Warning	HGX	11 hr
Apr 2, 11:19 AM CDT	Wind Advisory	HGX	8 hr
Apr 5, 5:55 AM CDT	Wind Advisory	HGX	13 hr
Apr 5, 7:16 PM CDT	Fire Weather Watch	HGX	17 hr
Apr 6, 3:16 PM CDT	Fire Weather Watch	HGX	15 hr
Apr 7, 6:17 AM CDT	Red Flag Warning	HGX	13 hr
Apr 12, 7:39 AM CDT	Mesoscale Discussion	SPC	66 min
Apr 12, 7:58 AM CDT	Tornado Watch	SPC	8 hr
Apr 12, 10:53 AM CDT	Mesoscale Discussion	SPC	2 hr
Apr 13, 6:54 AM CDT	Dense Fog Advisory	HGX	2 hr
Apr 17, 9:56 AM CDT	Mesoscale Discussion	SPC	94 min
Apr 17, 10:24 AM CDT	Tornado Watch	SPC	7 hr
Apr 17, 11:24 AM CDT	Flood Watch	HGX	33 hr
Apr 17, 1:45 PM CDT	Mesoscale Discussion	SPC	2 hr
Apr 17, 3:44 PM CDT	Tornado Watch	SPC	6 hr
Apr 17, 5:51 PM CDT	Areal Flood Advisory	HGX	54 min
Apr 17, 6:50 PM CDT	Mesoscale Discussion	SPC	85 min
Apr 18, 9:47 AM CDT	Mesoscale Discussion	SPC	28 min
Apr 18, 9:53 AM CDT	Tornado Watch	SPC	6 hr
Apr 18, 1:22 PM CDT	Flash Flood Warning	HGX	3 hr
Apr 18, 1:29 PM CDT	Severe Thunderstorm Warning	HGX	46 min
Apr 18, 1:43 PM CDT	Mesoscale Discussion	SPC	92 min
Apr 18, 2:06 PM CDT	Severe Thunderstorm Warning	HGX	24 min
Apr 18, 3:05 PM CDT	Severe Thunderstorm Warning	HGX	40 min
Apr 18, 3:20 PM CDT	Coastal Flood Statement	HGX	3 hr
Apr 18, 3:46 PM CDT	Tornado Warning	HGX	29 min
Apr 18, 4:04 PM CDT	Tornado Warning	HGX	19 min
Apr 18, 4:07 PM CDT	River Flood Warning	HGX	38 hr
Apr 18, 4:12 PM CDT	Severe Thunderstorm Warning	HGX	33 min
Apr 18, 4:15 PM CDT	Flash Flood Warning	HGX	3 hr
Apr 18, 5:37 PM CDT	River Flood Warning	HGX	27 hr
Apr 18, 11:56 PM CDT	Dense Fog Advisory	HGX	8 hr
Apr 24, 8:41 PM CDT	Flash Flood Warning	HGX	3 hr
Apr 24, 9:06 PM CDT	Severe Thunderstorm Warning	HGX	24 min
Apr 24, 9:34 PM CDT	Severe Thunderstorm Warning	HGX	41 min
Apr 24, 11:47 PM CDT	Flash Flood Warning	HGX	118 min
Apr 25, 1:22 AM CDT	River Flood Warning	HGX	6 days
Apr 25, 1:22 AM CDT	River Flood Warning	HGX	6 days
Apr 26, 11:31 AM CDT	Wind Advisory	HGX	9 hr
Apr 27, 3:47 PM CDT	Flood Watch	HGX	5 hr
Apr 27, 3:58 PM CDT	Tornado Watch	SPC	5 hr
Apr 27, 6:27 PM CDT	Severe Thunderstorm Warning	HGX	63 min
Apr 27, 6:30 PM CDT	Mesoscale Discussion	SPC	2 hr
Apr 27, 7:03 PM CDT	Flash Flood Warning	HGX	117 min
Apr 27, 7:26 PM CDT	Severe Thunderstorm Warning	HGX	64 min
Apr 28, 3:27 AM CDT	Flood Watch	HGX	12 hr
Apr 28, 6:27 AM CDT	Areal Flood Advisory	HGX	3 hr
Apr 28, 6:29 AM CDT	Flash Flood Warning	HGX	3 hr
May 11, 2:52 PM CDT	Severe Thunderstorm Watch	SPC	5 hr
May 24, 3:16 PM CDT	Severe Thunderstorm Warning	HGX	44 min
Jun 3, 1:20 PM CDT	Mesoscale Discussion	SPC	55 min
Jun 3, 2:37 PM CDT	Severe Thunderstorm Warning	HGX	38 min
Jun 24, 4:04 PM CDT	Heat Advisory	HGX	5 days
Jun 25, 4:23 PM CDT	Special Weather Statement	HGX	22 min
Jun 29, 8:06 PM CDT	Heat Advisory	HGX	17 hr
Jun 30, 5:10 PM CDT	Severe Thunderstorm Warning	HGX	53 min
Jul 4, 8:51 AM CDT	Heat Advisory	HGX	34 hr
Jul 8, 9:08 PM CDT	Heat Advisory	HGX	4 days
Jul 18, 3:40 PM CDT	Special Weather Statement	HGX	50 min
Jul 31, 3:47 AM CDT	Heat Advisory	HGX	15 hr
Aug 1, 4:12 AM CDT	Heat Advisory	HGX	15 hr
Aug 4, 7:03 PM CDT	Heat Advisory	HGX	3 days
Aug 10, 3:10 PM CDT	Heat Advisory	HGX	24 hr
Aug 12, 5:34 PM CDT	Severe Thunderstorm Warning	HGX	26 min
Aug 12, 5:55 PM CDT	Severe Thunderstorm Warning	HGX	35 min
Aug 21, 4:28 AM CDT	Heat Advisory	HGX	40 hr
Aug 21, 5:16 PM CDT	Severe Thunderstorm Warning	HGX	44 min
Aug 21, 5:57 PM CDT	Severe Thunderstorm Warning	HGX	35 min
Aug 26, 10:07 AM CDT	Mesoscale Discussion	SPC	83 min
Aug 26, 10:47 AM CDT	Severe Thunderstorm Watch	SPC	7 hr
Aug 26, 1:54 PM CDT	Mesoscale Discussion	SPC	96 min
Aug 28, 8:36 PM CDT	Severe Thunderstorm Warning	HGX	39 min
Aug 30, 9:48 PM CDT	Tornado Warning	HGX	42 min
Aug 30, 10:35 PM CDT	Special Weather Statement	HGX	55 min
Aug 30, 10:46 PM CDT	Flash Flood Warning	HGX	59 min
Sep 27, 1:06 AM CDT	Dense Fog Advisory	HGX	8 hr
Oct 1, 4:09 PM CDT	Areal Flood Advisory	HGX	51 min
Oct 1, 4:15 PM CDT	Areal Flood Advisory	HGX	45 min
Oct 1, 4:25 PM CDT	Flash Flood Warning	HGX	50 min
Oct 1, 5:15 PM CDT	Flash Flood Warning	HGX	47 min
Oct 22, 12:14 AM CDT	Coastal Flood Statement	HGX	3 hr
Oct 22, 3:24 AM CDT	Coastal Flood Advisory	HGX	10 hr
Oct 22, 5:08 AM CDT	Areal Flood Advisory	HGX	112 min
Oct 22, 5:35 AM CDT	Mesoscale Discussion	SPC	85 min
Oct 22, 5:55 AM CDT	Tornado Watch	SPC	6 hr
Oct 22, 6:46 AM CDT	Flash Flood Warning	HGX	119 min
Oct 22, 7:44 AM CDT	River Flood Warning	HGX	6 hr
Oct 22, 7:48 AM CDT	Mesoscale Discussion	SPC	117 min
Oct 25, 3:43 PM CDT	Flash Flood Watch	HGX	24 hr
Oct 28, 5:15 AM CDT	Flash Flood Watch	HGX	47 hr
Oct 29, 11:19 AM CDT	Wind Advisory	HGX	9 hr
Nov 6, 3:35 AM CST	Coastal Flood Statement	HGX	3 days
Nov 6, 9:24 PM CST	Dense Fog Advisory	HGX	7 hr
Nov 7, 1:31 PM CST	Coastal Flood Watch	HGX	25 hr
Nov 8, 6:22 AM CST	Coastal Flood Warning	HGX	33 hr
Nov 9, 10:50 PM CST	Coastal Flood Advisory	HGX	13 hr
Nov 18, 1:48 PM CST	Coastal Flood Statement	HGX	32 hr
Nov 19, 3:11 PM CST	Flash Flood Watch	HGX	27 hr
Nov 19, 10:08 PM CST	Coastal Flood Warning	HGX	32 hr
Nov 22, 8:56 PM CST	Dense Fog Advisory	HGX	13 hr
Nov 29, 3:30 PM CST	Coastal Flood Statement	HGX	24 hr
Nov 30, 3:02 PM CST	Coastal Flood Advisory	HGX	30 hr
Dec 3, 4:55 AM CST	Winter Storm Watch	HGX	17 hr
Dec 3, 7:43 AM CST	Freeze Warning	HGX	49 hr
Dec 3, 10:17 PM CST	Winter Storm Warning	HGX	20 hr
Dec 7, 1:16 AM CST	Dense Fog Advisory	HGX	7 hr
Dec 8, 5:07 AM CST	Dense Fog Advisory	HGX	5 hr
Dec 8, 2:32 PM CST	Dense Fog Advisory	HGX	8 hr
Dec 11, 8:25 AM CST	Coastal Flood Statement	HGX	19 hr
Dec 12, 3:45 AM CST	Coastal Flood Statement	HGX	7 hr
Dec 12, 2:17 PM CST	Coastal Flood Statement	HGX	9 hr
Dec 12, 3:30 PM CST	Dense Fog Advisory	HGX	18 hr
Dec 13, 3:01 PM CST	Dense Fog Advisory	HGX	19 hr
Dec 14, 2:56 PM CST	Dense Fog Advisory	HGX	18 hr
Dec 23, 8:48 PM CST	Tornado Watch	SPC	9 hr
Dec 23, 9:32 PM CST	Wind Advisory	HGX	30 hr
Dec 23, 11:06 PM CST	Mesoscale Discussion	SPC	114 min
Dec 24, 3:30 AM CST	Mesoscale Discussion	SPC	2 hr
Dec 30, 11:57 PM CST	Dense Fog Advisory	HGX	12 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	17
Tornado Warning	3
Severe Thunderstorm Watch	5
Tornado Watch	9
Mesoscale Discussion	16
Special Weather Statement	3
Flooding
Flash Flood Warning	10
River Flood Warning	5
Flash Flood Watch	3
Flood Watch	3
Areal Flood Advisory	5
Winter
Winter Storm Warning	1
Winter Storm Watch	1
Heat
Heat Advisory	9
Cold
Freeze Warning	2
Wind and dust
Wind Advisory	7
Fire
Red Flag Warning	9
Fire Weather Watch	7
Fog and smoke
Dense Fog Advisory	19
Coast and beach
Coastal Flood Warning	2
Coastal Flood Watch	1
Coastal Flood Advisory	3
Coastal Flood Statement	8

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.