Weather alerts in Dallas County, Alabama, 2011

228 weather alerts in 2011, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Dallas County and its neighbors

Each county as a circle sized by its count in 2011. Tap one for its archive.

Alerts: 228
Warnings: 62
Watches: 34
Advisories: 49
Busiest month: April52 alerts
Busiest day: April 16, 20119 alerts

Over time

By month

Warning verification

How often warnings here had a storm report inside them, and how much warning the reports had.

7 of 13 tornado warnings covering Dallas County in 2011 had a tornado report inside them; 5 of 7 tornado reports fell inside a warning, on average 53 minutes after it went out.

Dallas County, 2011

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	13	7	46%	7	71%	53 min
Severe thunderstorm warnings	25	13	48%	19	47%	20 min
Flash flood warnings	2	2	0%	0

Each office's whole area, 2011

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Birmingham, AL: tornado warnings	175	71	59%	152	88%	29 min
NWS Birmingham, AL: severe thunderstorm warnings	421	273	35%	898	76%	23 min
NWS Birmingham, AL: flash flood warnings	67	43	36%	94	90%	129 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 1, 12:28 AM CST	Wind Advisory	BMX	9 hr
Jan 1, 3:10 AM CST	Tornado Watch	SPC	7 hr
Jan 1, 6:06 AM CST	Mesoscale Discussion	SPC	114 min
Jan 1, 9:04 AM CST	Mesoscale Discussion	SPC	56 min
Jan 2, 11:24 AM CST	Fire Weather Watch	BMX	4 hr
Jan 2, 2:54 PM CST	Red Flag Warning	BMX	26 hr
Jan 7, 4:12 AM CST	Wind Advisory	BMX	14 hr
Jan 7, 2:55 PM CST	Winter Storm Watch	BMX	31 hr
Jan 8, 12:33 PM CST	Wind Advisory	BMX	5 hr
Jan 8, 9:30 PM CST	Winter Storm Warning	BMX	32 hr
Jan 9, 5:09 AM CST	Ice Storm Warning	BMX	24 hr
Jan 9, 3:06 PM CST	Mesoscale Discussion	SPC	4 hr
Jan 9, 8:27 PM CST	Mesoscale Discussion	SPC	5 hr
Jan 10, 1:17 AM CST	Freezing Rain Advisory	BMX	12 hr
Jan 11, 5:13 PM CST	Hard Freeze Watch	BMX	10 hr
Jan 11, 5:13 PM CST	Hard Freeze Watch	BMX	35 hr
Jan 12, 3:13 AM CST	Hard Freeze Warning	BMX	30 hr
Jan 13, 3:50 AM CST	Hard Freeze Warning	BMX	29 hr
Jan 13, 5:27 AM CST	Fire Weather Watch	BMX	10 hr
Jan 20, 7:17 AM CST	Dense Fog Advisory	BMX	3 hr
Jan 21, 6:39 AM CST	Fire Weather Watch	BMX	9 hr
Jan 21, 3:14 PM CST	Red Flag Warning	BMX	27 hr
Jan 31, 3:08 PM CST	Wind Advisory	BMX	37 hr
Feb 3, 5:47 AM CST	Freezing Rain Advisory	BMX	8 hr
Feb 3, 1:51 PM CST	Winter Weather Advisory	BMX	22 hr
Feb 7, 5:19 PM CST	Wind Advisory	BMX	6 hr
Feb 8, 5:12 AM CST	Winter Storm Watch	BMX	25 hr
Feb 9, 6:00 AM CST	Winter Storm Warning	BMX	21 hr
Feb 13, 3:25 AM CST	Red Flag Warning	BMX	15 hr
Feb 15, 1:06 PM CST	Red Flag Warning	BMX	5 hr
Feb 18, 8:29 AM CST	Dense Fog Advisory	BMX	91 min
Feb 19, 4:53 AM CST	Dense Fog Advisory	BMX	4 hr
Feb 24, 6:00 AM CST	Wind Advisory	BMX	30 hr
Feb 24, 11:38 PM CST	Severe Thunderstorm Warning	BMX	67 min
Feb 27, 3:59 PM CST	Wind Advisory	BMX	26 hr
Feb 28, 12:19 PM CST	Mesoscale Discussion	SPC	86 min
Feb 28, 12:29 PM CST	Tornado Watch	SPC	7 hr
Feb 28, 3:36 PM CST	Mesoscale Discussion	SPC	84 min
Feb 28, 4:16 PM CST	Severe Thunderstorm Warning	BMX	44 min
Feb 28, 4:22 PM CST	Severe Thunderstorm Warning	BMX	38 min
Feb 28, 4:47 PM CST	Severe Thunderstorm Warning	BMX	43 min
Feb 28, 5:15 PM CST	Severe Thunderstorm Warning	BMX	45 min
Mar 5, 6:39 AM CST	Wind Advisory	BMX	5 hr
Mar 6, 12:12 AM CST	Wind Advisory	BMX	9 hr
Mar 8, 3:55 AM CST	Flash Flood Watch	BMX	33 hr
Mar 8, 3:08 PM CST	Wind Advisory	BMX	22 hr
Mar 8, 9:49 PM CST	River Flood Warning	BMX	61 hr
Mar 8, 11:55 PM CST	Special Weather Statement	BMX	50 min
Mar 9, 1:37 AM CST	Special Weather Statement	BMX	38 min
Mar 9, 5:24 AM CST	Flash Flood Warning	BMX	6 hr
Mar 9, 5:48 AM CST	Special Weather Statement	BMX	57 min
Mar 9, 8:13 PM CST	River Flood Warning	BMX	4 days
Mar 9, 9:45 PM CST	Wind Advisory	BMX	20 hr
Mar 10, 11:16 AM CST	River Flood Warning	MOB	6 days
Mar 14, 5:37 PM CDT	Mesoscale Discussion	SPC	83 min
Mar 23, 6:40 AM CDT	Wind Advisory	BMX	12 hr
Mar 26, 11:25 AM CDT	Mesoscale Discussion	SPC	95 min
Mar 26, 12:15 PM CDT	Tornado Watch	SPC	8 hr
Mar 26, 1:36 PM CDT	Tornado Warning	BMX	39 min
Mar 26, 2:23 PM CDT	Mesoscale Discussion	SPC	97 min
Mar 26, 2:49 PM CDT	Severe Thunderstorm Warning	BMX	41 min
Mar 27, 7:33 AM CDT	Mesoscale Discussion	SPC	117 min
Mar 27, 8:55 AM CDT	Severe Thunderstorm Watch	SPC	7 hr
Mar 29, 10:32 PM CDT	Mesoscale Discussion	SPC	58 min
Apr 3, 5:02 AM CDT	Wind Advisory	BMX	14 hr
Apr 4, 4:21 AM CDT	Wind Advisory	BMX	24 hr
Apr 4, 4:28 PM CDT	Mesoscale Discussion	SPC	62 min
Apr 4, 4:55 PM CDT	Tornado Watch	SPC	6 hr
Apr 4, 6:50 PM CDT	Mesoscale Discussion	SPC	85 min
Apr 4, 8:25 PM CDT	Severe Thunderstorm Warning	BMX	65 min
Apr 4, 8:42 PM CDT	Areal Flood Advisory	BMX	3 hr
Apr 5, 3:17 PM CDT	Frost Advisory	BMX	16 hr
Apr 11, 3:52 AM CDT	Wind Advisory	BMX	20 hr
Apr 11, 3:56 PM CDT	Mesoscale Discussion	SPC	34 min
Apr 11, 4:05 PM CDT	Tornado Watch	SPC	6 hr
Apr 11, 6:48 PM CDT	Severe Thunderstorm Warning	BMX	57 min
Apr 11, 7:30 PM CDT	Severe Thunderstorm Warning	BMX	60 min
Apr 11, 7:41 PM CDT	Severe Thunderstorm Warning	BMX	64 min
Apr 11, 8:20 PM CDT	Severe Thunderstorm Warning	BMX	40 min
Apr 11, 8:53 PM CDT	Severe Thunderstorm Warning	BMX	67 min
Apr 15, 3:29 AM CDT	Wind Advisory	BMX	22 hr
Apr 15, 10:28 AM CDT	Mesoscale Discussion	SPC	2 hr
Apr 15, 11:21 AM CDT	Tornado Watch	SPC	9 hr
Apr 15, 12:59 PM CDT	Tornado Warning	BMX	46 min
Apr 15, 1:30 PM CDT	Mesoscale Discussion	SPC	2 hr
Apr 15, 3:35 PM CDT	Mesoscale Discussion	SPC	85 min
Apr 15, 6:11 PM CDT	Tornado Warning	BMX	64 min
Apr 15, 6:15 PM CDT	Tornado Warning	BMX	60 min
Apr 15, 7:03 PM CDT	Tornado Warning	BMX	57 min
Apr 15, 7:09 PM CDT	Tornado Warning	BMX	66 min
Apr 15, 7:16 PM CDT	Mesoscale Discussion	SPC	59 min
Apr 15, 7:48 PM CDT	Tornado Watch	SPC	6 hr
Apr 15, 8:10 PM CDT	Tornado Warning	BMX	50 min
Apr 15, 9:19 PM CDT	Tornado Warning	BMX	41 min
Apr 15, 10:32 PM CDT	Severe Thunderstorm Warning	BMX	28 min
Apr 15, 10:41 PM CDT	Mesoscale Discussion	SPC	94 min
Apr 16, 4:13 AM CDT	Wind Advisory	BMX	15 hr
Apr 20, 1:16 PM CDT	Mesoscale Discussion	SPC	89 min
Apr 20, 1:33 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Apr 26, 10:05 AM CDT	Wind Advisory	BMX	38 hr
Apr 26, 10:16 AM CDT	Special Weather Statement	BMX	44 min
Apr 27, 5:44 AM CDT	Severe Thunderstorm Warning	BMX	46 min
Apr 27, 6:02 AM CDT	Special Weather Statement	BMX	43 min
Apr 27, 1:05 PM CDT	Mesoscale Discussion	SPC	85 min
Apr 27, 1:42 PM CDT	Tornado Watch PDS	SPC	8 hr
Apr 27, 2:56 PM CDT	Mesoscale Discussion	SPC	2 hr
Apr 27, 5:01 PM CDT	Mesoscale Discussion	SPC	89 min
Apr 27, 6:39 PM CDT	Mesoscale Discussion	SPC	66 min
Apr 27, 7:55 PM CDT	Mesoscale Discussion	SPC	65 min
Apr 27, 8:17 PM CDT	Tornado Warning	BMX	58 min
Apr 27, 9:03 PM CDT	Tornado Warning	BMX	57 min
Apr 27, 9:20 PM CDT	Mesoscale Discussion	SPC	25 min
Apr 27, 9:36 PM CDT	Severe Thunderstorm Warning	BMX	54 min
Apr 27, 9:42 PM CDT	Tornado Watch	SPC	4 hr
Apr 27, 9:55 PM CDT	Areal Flood Advisory	BMX	3 hr
Apr 27, 11:15 PM CDT	Severe Thunderstorm Warning	BMX	45 min
May 4, 1:31 AM CDT	Dense Fog Advisory	BMX	7 hr
May 13, 3:04 PM CDT	Special Weather Statement	BMX	41 min
May 13, 3:53 PM CDT	Special Weather Statement	BMX	52 min
May 14, 12:54 AM CDT	Mesoscale Discussion	SPC	96 min
May 25, 4:25 AM CDT	Wind Advisory	BMX	15 hr
May 26, 9:15 AM CDT	Severe Thunderstorm Watch	SPC	9 hr
May 26, 12:22 PM CDT	Mesoscale Discussion	SPC	83 min
May 26, 1:07 PM CDT	Severe Thunderstorm Warning	BMX	38 min
Jun 2, 5:06 PM CDT	Mesoscale Discussion	SPC	54 min
Jun 3, 3:39 PM CDT	Special Weather Statement	BMX	36 min
Jun 3, 4:37 PM CDT	Special Weather Statement	BMX	23 min
Jun 3, 5:32 PM CDT	Mesoscale Discussion	SPC	118 min
Jun 8, 2:57 PM CDT	Special Weather Statement	BMX	48 min
Jun 10, 2:05 PM CDT	Special Weather Statement	BMX	25 min
Jun 10, 2:29 PM CDT	Severe Thunderstorm Warning	BMX	46 min
Jun 11, 4:28 PM CDT	Special Weather Statement	BMX	47 min
Jun 11, 4:33 PM CDT	Special Weather Statement	BMX	27 min
Jun 17, 9:49 AM CDT	Mesoscale Discussion	SPC	86 min
Jun 17, 11:42 AM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 17, 12:23 PM CDT	Special Weather Statement	BMX	67 min
Jun 17, 1:22 PM CDT	Severe Thunderstorm Warning	BMX	38 min
Jun 22, 2:25 PM CDT	Special Weather Statement	BMX	50 min
Jun 22, 3:18 PM CDT	Special Weather Statement	BMX	57 min
Jun 24, 5:20 PM CDT	Mesoscale Discussion	SPC	85 min
Jun 28, 10:26 AM CDT	Severe Thunderstorm Watch	SPC	8 hr
Jun 28, 3:19 PM CDT	Mesoscale Discussion	SPC	116 min
Jun 29, 3:56 AM CDT	Dense Fog Advisory	BMX	5 hr
Jul 1, 10:35 AM CDT	Mesoscale Discussion	SPC	115 min
Jul 3, 6:07 PM CDT	Special Weather Statement	BMX	38 min
Jul 5, 4:09 PM CDT	Special Weather Statement	BMX	51 min
Jul 7, 6:15 PM CDT	Special Weather Statement	BMX	45 min
Jul 8, 1:00 PM CDT	Mesoscale Discussion	SPC	90 min
Jul 9, 4:04 PM CDT	Heat Advisory	BMX	27 hr
Jul 10, 3:55 PM CDT	Heat Advisory	BMX	27 hr
Jul 10, 4:33 PM CDT	Special Weather Statement	BMX	57 min
Jul 10, 4:39 PM CDT	Severe Thunderstorm Warning	BMX	43 min
Jul 10, 4:51 PM CDT	Severe Thunderstorm Warning	BMX	39 min
Jul 11, 12:44 PM CDT	Special Weather Statement	BMX	46 min
Jul 11, 3:15 PM CDT	Heat Advisory	BMX	28 hr
Jul 13, 5:15 PM CDT	Special Weather Statement	BMX	30 min
Jul 14, 1:04 PM CDT	Mesoscale Discussion	SPC	116 min
Jul 31, 2:02 PM CDT	Special Weather Statement	BMX	43 min
Jul 31, 2:21 PM CDT	Severe Thunderstorm Warning	BMX	24 min
Aug 1, 3:48 PM CDT	Heat Advisory	BMX	62 hr
Aug 9, 1:20 PM CDT	Mesoscale Discussion	SPC	115 min
Aug 9, 1:49 PM CDT	Special Weather Statement	BMX	41 min
Aug 9, 2:24 PM CDT	Severe Thunderstorm Warning	BMX	39 min
Aug 10, 2:23 PM CDT	Mesoscale Discussion	SPC	67 min
Aug 10, 4:12 PM CDT	Special Weather Statement	BMX	48 min
Aug 10, 4:23 PM CDT	Severe Thunderstorm Warning	BMX	52 min
Aug 10, 5:34 PM CDT	Mesoscale Discussion	SPC	86 min
Aug 12, 2:05 PM CDT	Mesoscale Discussion	SPC	115 min
Aug 13, 1:57 PM CDT	Mesoscale Discussion	SPC	2 hr
Aug 27, 4:19 AM CDT	Red Flag Warning	BMX	15 hr
Aug 28, 11:20 AM CDT	Red Flag Warning	BMX	8 hr
Aug 29, 4:36 AM CDT	Red Flag Warning	BMX	14 hr
Sep 3, 9:16 PM CDT	Flash Flood Watch	BMX	49 hr
Sep 4, 2:47 PM CDT	Mesoscale Discussion	SPC	88 min
Sep 4, 3:47 PM CDT	Tornado Watch	SPC	6 hr
Sep 4, 6:29 PM CDT	Mesoscale Discussion	SPC	2 hr
Sep 4, 9:42 PM CDT	Tornado Watch	SPC	9 hr
Sep 5, 4:26 AM CDT	Mesoscale Discussion	SPC	94 min
Sep 5, 4:31 AM CDT	Wind Advisory	BMX	26 hr
Sep 5, 5:35 AM CDT	Tornado Watch	SPC	10 hr
Sep 5, 7:24 AM CDT	Mesoscale Discussion	SPC	66 min
Sep 5, 11:01 AM CDT	Mesoscale Discussion	SPC	29 min
Sep 5, 12:20 PM CDT	Tornado Warning	BMX	25 min
Sep 5, 12:35 PM CDT	Tornado Warning	BMX	25 min
Sep 5, 3:49 PM CDT	Tornado Watch	SPC	4 hr
Sep 20, 1:47 PM CDT	Areal Flood Advisory	BMX	3 hr
Sep 20, 2:28 PM CDT	Flash Flood Warning	BMX	3 hr
Sep 20, 2:53 PM CDT	Areal Flood Advisory	BMX	3 hr
Sep 20, 4:02 PM CDT	Special Weather Statement	BMX	43 min
Sep 21, 9:48 PM CDT	Areal Flood Advisory	BMX	3 hr
Sep 26, 3:10 PM CDT	Mesoscale Discussion	SPC	95 min
Sep 26, 10:18 PM CDT	Dense Fog Advisory	BMX	11 hr
Sep 27, 8:25 AM CDT	Special Weather Statement	BMX	65 min
Sep 28, 4:57 AM CDT	Special Weather Statement	BMX	33 min
Sep 28, 5:41 AM CDT	Special Weather Statement	BMX	49 min
Sep 28, 6:15 AM CDT	Areal Flood Advisory	BMX	2 hr
Sep 28, 6:29 AM CDT	Special Weather Statement	BMX	31 min
Sep 29, 5:30 AM CDT	Dense Fog Advisory	BMX	4 hr
Sep 29, 3:05 PM CDT	Fire Weather Watch	BMX	20 hr
Sep 30, 4:44 AM CDT	Fire Weather Watch	BMX	24 hr
Oct 1, 5:09 AM CDT	Red Flag Warning	BMX	13 hr
Oct 20, 4:23 AM CDT	Frost Advisory	BMX	29 hr
Oct 21, 3:59 AM CDT	Frost Advisory	BMX	29 hr
Oct 22, 4:52 AM CDT	Frost Advisory	BMX	28 hr
Oct 28, 3:02 PM CDT	Red Flag Warning	BMX	27 hr
Oct 29, 3:39 PM CDT	Frost Advisory	BMX	17 hr
Oct 30, 3:30 PM CDT	Frost Advisory	BMX	18 hr
Oct 31, 3:48 PM CDT	Frost Advisory	BMX	17 hr
Nov 1, 7:30 AM CDT	Red Flag Warning	BMX	11 hr
Nov 2, 11:14 AM CDT	Red Flag Warning	BMX	6 hr
Nov 10, 4:17 AM CST	Freeze Warning	BMX	29 hr
Nov 10, 3:33 PM CST	Fire Weather Watch	BMX	38 hr
Nov 10, 3:33 PM CST	Red Flag Warning	BMX	26 hr
Nov 16, 1:35 AM CST	Mesoscale Discussion	SPC	115 min
Nov 16, 2:20 AM CST	Tornado Watch	SPC	8 hr
Nov 16, 9:08 AM CST	Tornado Warning	BMX	37 min
Nov 16, 9:46 AM CST	Tornado Watch	SPC	7 hr
Nov 16, 10:20 AM CST	Severe Thunderstorm Warning	BMX	40 min
Nov 18, 4:25 AM CST	Red Flag Warning	BMX	13 hr
Nov 22, 11:38 AM CST	Mesoscale Discussion	SPC	37 min
Nov 22, 11:58 AM CST	Tornado Watch	SPC	8 hr
Nov 22, 2:40 PM CST	Mesoscale Discussion	SPC	65 min
Dec 13, 8:58 PM CST	Dense Fog Advisory	BMX	11 hr
Dec 22, 9:32 AM CST	Mesoscale Discussion	SPC	58 min
Dec 22, 10:00 AM CST	Tornado Watch	SPC	7 hr
Dec 22, 11:22 AM CST	Mesoscale Discussion	SPC	53 min
Dec 22, 2:51 PM CST	Mesoscale Discussion	SPC	54 min
Dec 30, 5:21 AM CST	Dense Fog Advisory	BMX	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	25
Tornado Warning	13
Severe Thunderstorm Watch	5
Tornado Watch	17
Mesoscale Discussion	53
Special Weather Statement	30
Flooding
Flash Flood Warning	2
River Flood Warning	3
Flash Flood Watch	2
Areal Flood Advisory	6
Winter
Ice Storm Warning	1
Winter Storm Warning	2
Winter Storm Watch	2
Freezing Rain Advisory	2
Winter Weather Advisory	1
Heat
Heat Advisory	4
Cold
Freeze Warning	1
Hard Freeze Warning	2
Hard Freeze Watch	2
Frost Advisory	7
Wind and dust
Wind Advisory	20
Fire
Red Flag Warning	13
Fire Weather Watch	6
Fog and smoke
Dense Fog Advisory	9

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2010 2012

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.