Weather alerts in Shelby County, Alabama, 2012

205 weather alerts in 2012, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Shelby County and its neighbors

Each county as a circle sized by its count in 2012. Tap one for its archive.

Alerts: 205
Warnings: 60
Watches: 25
Advisories: 43
Busiest month: July39 alerts
Busiest day: July 31, 201214 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 1 tornado warnings covering Shelby County in 2012 had a tornado report inside them.

Shelby County, 2012

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	1	1	0%	0
Severe thunderstorm warnings	31	23	26%	39	79%	23 min
Flash flood warnings	6	6	0%	15	100%	33 min

Each office's whole area, 2012

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Birmingham, AL: tornado warnings	44	21	52%	51	76%	21 min
NWS Birmingham, AL: severe thunderstorm warnings	317	242	24%	613	72%	20 min
NWS Birmingham, AL: flash flood warnings	40	33	18%	60	95%	54 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, 4:46 AM CST	Fire Weather Watch	BMX	34 hr
Jan 1, 2:55 PM CST	Fire Weather Watch	BMX	15 hr
Jan 2, 3:39 AM CST	Wind Advisory	BMX	14 hr
Jan 2, 4:51 AM CST	Red Flag Warning	BMX	12 hr
Jan 2, 2:35 PM CST	Red Flag Warning	BMX	26 hr
Jan 2, 6:05 PM CST	Wind Advisory	BMX	5 hr
Jan 8, 5:56 PM CST	Dense Fog Advisory	BMX	15 hr
Jan 12, 4:17 AM CST	Wind Advisory	BMX	14 hr
Jan 17, 7:02 PM CST	Special Weather Statement	BMX	58 min
Jan 17, 7:54 PM CST	Special Weather Statement	BMX	66 min
Jan 21, 1:52 AM CST	Mesoscale Discussion	SPC	113 min
Jan 21, 4:20 AM CST	Mesoscale Discussion	SPC	55 min
Jan 21, 4:55 AM CST	Tornado Watch	SPC	7 hr
Jan 21, 7:22 AM CST	Mesoscale Discussion	SPC	83 min
Jan 21, 8:37 AM CST	Areal Flood Advisory	BMX	113 min
Jan 21, 8:58 AM CST	Special Weather Statement	BMX	32 min
Jan 21, 10:01 AM CST	Mesoscale Discussion	SPC	59 min
Jan 21, 11:35 PM CST	Dense Fog Advisory	BMX	9 hr
Jan 23, 1:25 AM CST	Mesoscale Discussion	SPC	2 hr
Jan 23, 2:44 AM CST	Tornado Watch	SPC	9 hr
Jan 23, 4:02 AM CST	Mesoscale Discussion	SPC	118 min
Jan 23, 5:24 AM CST	Tornado Warning	BMX	26 min
Jan 26, 9:55 AM CST	Tornado Watch	SPC	7 hr
Jan 28, 5:45 AM CST	Fire Weather Watch	BMX	9 hr
Jan 28, 2:55 PM CST	Red Flag Warning	BMX	27 hr
Jan 29, 5:58 AM CST	Fire Weather Watch	BMX	21 hr
Jan 30, 3:12 AM CST	Red Flag Warning	BMX	14 hr
Feb 1, 5:37 PM CST	Dense Fog Advisory	BMX	14 hr
Feb 10, 3:33 PM CST	Hard Freeze Watch	BMX	24 hr
Feb 10, 3:38 PM CST	Fire Weather Watch	BMX	14 hr
Feb 11, 4:39 AM CST	Wind Advisory	BMX	13 hr
Feb 11, 5:41 AM CST	Red Flag Warning	BMX	36 hr
Feb 11, 3:35 PM CST	Hard Freeze Warning	BMX	17 hr
Feb 12, 5:28 AM CST	Fire Weather Watch	BMX	24 hr
Feb 15, 3:33 AM CST	Dense Fog Advisory	BMX	4 hr
Feb 22, 2:08 PM CST	Mesoscale Discussion	SPC	2 hr
Feb 23, 10:59 AM CST	Wind Advisory	BMX	12 hr
Feb 24, 5:56 AM CST	Mesoscale Discussion	SPC	94 min
Feb 24, 2:44 PM CST	Fire Weather Watch	BMX	14 hr
Feb 25, 5:06 AM CST	Red Flag Warning	BMX	13 hr
Feb 26, 11:31 AM CST	Red Flag Warning	BMX	5 hr
Mar 1, 3:00 AM CST	Mesoscale Discussion	SPC	90 min
Mar 2, 4:53 AM CST	Wind Advisory	BMX	13 hr
Mar 2, 4:37 PM CST	Tornado Watch	SPC	7 hr
Mar 2, 5:41 PM CST	Mesoscale Discussion	SPC	2 hr
Mar 2, 6:44 PM CST	Severe Thunderstorm Warning	BMX	46 min
Mar 2, 10:07 PM CST	Mesoscale Discussion	SPC	113 min
Mar 2, 10:52 PM CST	Severe Thunderstorm Warning	BMX	23 min
Mar 2, 10:56 PM CST	Tornado Watch	SPC	6 hr
Mar 2, 11:15 PM CST	Areal Flood Advisory	BMX	3 hr
Mar 3, 4:27 AM CST	Areal Flood Advisory	BMX	3 hr
Mar 4, 5:23 AM CST	Red Flag Warning	BMX	12 hr
Mar 5, 12:07 PM CST	Red Flag Warning	BMX	6 hr
Mar 6, 3:53 AM CST	Red Flag Warning	BMX	14 hr
Mar 14, 3:35 AM CDT	Dense Fog Advisory	BMX	7 hr
Mar 15, 2:33 AM CDT	Dense Fog Advisory	BMX	7 hr
Mar 16, 12:40 PM CDT	Mesoscale Discussion	SPC	2 hr
Mar 22, 1:00 PM CDT	Mesoscale Discussion	SPC	60 min
Mar 23, 10:55 AM CDT	Areal Flood Advisory	BMX	2 hr
Mar 31, 5:00 PM CDT	Mesoscale Discussion	SPC	30 min
Mar 31, 5:04 PM CDT	Severe Thunderstorm Watch	SPC	3 hr
Mar 31, 7:27 PM CDT	Mesoscale Discussion	SPC	63 min
Mar 31, 8:14 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Mar 31, 8:21 PM CDT	Special Weather Statement	BMX	24 min
Mar 31, 8:36 PM CDT	Severe Thunderstorm Warning	BMX	39 min
Mar 31, 8:44 PM CDT	Areal Flood Advisory	BMX	106 min
Apr 5, 9:14 AM CDT	Severe Thunderstorm Watch	SPC	8 hr
Apr 5, 10:41 AM CDT	Mesoscale Discussion	SPC	94 min
Apr 5, 12:03 PM CDT	Special Weather Statement	BMX	57 min
Apr 5, 6:14 PM CDT	Severe Thunderstorm Watch	SPC	3 hr
Apr 5, 6:15 PM CDT	Mesoscale Discussion	SPC	45 min
Apr 5, 6:28 PM CDT	Special Weather Statement	BMX	47 min
Apr 5, 6:33 PM CDT	Severe Thunderstorm Warning	BMX	42 min
Apr 5, 6:43 PM CDT	Severe Thunderstorm Warning	BMX	47 min
Apr 5, 7:14 PM CDT	Severe Thunderstorm Warning	BMX	32 min
Apr 5, 7:20 PM CDT	Severe Thunderstorm Warning	BMX	40 min
Apr 11, 4:26 AM CDT	Red Flag Warning	BMX	14 hr
Apr 12, 4:01 AM CDT	Red Flag Warning	BMX	15 hr
Apr 16, 12:56 PM CDT	Mesoscale Discussion	SPC	2 hr
Apr 17, 1:34 PM CDT	Mesoscale Discussion	SPC	116 min
Apr 17, 2:21 PM CDT	Special Weather Statement	BMX	39 min
Apr 17, 3:06 PM CDT	Special Weather Statement	BMX	39 min
Apr 22, 3:43 AM CDT	Wind Advisory	BMX	15 hr
Apr 22, 2:57 PM CDT	Fire Weather Watch	BMX	12 hr
Apr 23, 3:18 AM CDT	Wind Advisory	BMX	16 hr
May 6, 8:33 AM CDT	Special Weather Statement	BMX	42 min
May 6, 5:24 PM CDT	Special Weather Statement	BMX	51 min
May 6, 5:26 PM CDT	Special Weather Statement	BMX	49 min
May 6, 8:30 PM CDT	Special Weather Statement	BMX	45 min
May 7, 3:15 PM CDT	Special Weather Statement	BMX	45 min
May 7, 4:29 PM CDT	Special Weather Statement	BMX	46 min
May 8, 1:06 AM CDT	Dense Fog Advisory	BMX	8 hr
May 8, 9:03 PM CDT	Special Weather Statement	BMX	42 min
May 8, 9:55 PM CDT	Special Weather Statement	BMX	65 min
May 15, 5:39 AM CDT	Dense Fog Advisory	BMX	2 hr
May 18, 5:29 PM CDT	Special Weather Statement	BMX	46 min
May 22, 1:13 AM CDT	Special Weather Statement	BMX	47 min
May 29, 10:42 PM CDT	Special Weather Statement	BMX	48 min
May 29, 11:11 PM CDT	Severe Thunderstorm Warning	BMX	49 min
Jun 3, 1:11 PM CDT	Mesoscale Discussion	SPC	64 min
Jun 3, 1:26 PM CDT	Severe Thunderstorm Watch	SPC	5 hr
Jun 3, 3:47 PM CDT	Mesoscale Discussion	SPC	88 min
Jun 3, 4:07 PM CDT	Severe Thunderstorm Warning	BMX	38 min
Jun 3, 4:33 PM CDT	Severe Thunderstorm Warning	BMX	42 min
Jun 3, 4:53 PM CDT	Severe Thunderstorm Warning	BMX	37 min
Jun 4, 5:33 AM CDT	Mesoscale Discussion	SPC	87 min
Jun 4, 7:12 AM CDT	Special Weather Statement	BMX	48 min
Jun 11, 5:17 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 11, 7:17 PM CDT	Severe Thunderstorm Warning	BMX	43 min
Jun 11, 7:56 PM CDT	Special Weather Statement	BMX	49 min
Jun 11, 7:59 PM CDT	Severe Thunderstorm Warning	BMX	46 min
Jun 11, 8:06 PM CDT	Severe Thunderstorm Warning	BMX	54 min
Jun 11, 8:18 PM CDT	Flash Flood Warning	BMX	3 hr
Jun 11, 8:53 PM CDT	Severe Thunderstorm Warning	BMX	52 min
Jun 28, 3:52 AM CDT	Heat Advisory	BMX	55 hr
Jun 30, 11:21 AM CDT	Excessive Heat Warning	BMX	34 hr
Jul 1, 1:08 PM CDT	Mesoscale Discussion	SPC	3 hr
Jul 1, 3:08 PM CDT	Special Weather Statement	BMX	52 min
Jul 1, 3:42 PM CDT	Heat Advisory	BMX	23 hr
Jul 3, 10:57 AM CDT	Heat Advisory	BMX	8 hr
Jul 5, 6:20 PM CDT	Mesoscale Discussion	SPC	115 min
Jul 5, 6:40 PM CDT	Severe Thunderstorm Warning	BMX	35 min
Jul 5, 6:55 PM CDT	Severe Thunderstorm Warning	BMX	35 min
Jul 5, 7:14 PM CDT	Special Weather Statement	BMX	46 min
Jul 5, 7:27 PM CDT	Severe Thunderstorm Warning	BMX	22 min
Jul 5, 7:51 PM CDT	Special Weather Statement	BMX	39 min
Jul 5, 8:01 PM CDT	Severe Thunderstorm Warning	BMX	29 min
Jul 9, 6:48 PM CDT	Special Weather Statement	BMX	42 min
Jul 9, 7:29 PM CDT	Special Weather Statement	BMX	61 min
Jul 10, 4:17 PM CDT	Severe Thunderstorm Warning	BMX	43 min
Jul 10, 4:56 PM CDT	Severe Thunderstorm Warning	BMX	49 min
Jul 10, 5:44 PM CDT	Severe Thunderstorm Warning	BMX	44 min
Jul 11, 3:04 PM CDT	Special Weather Statement	BMX	41 min
Jul 11, 3:49 PM CDT	Special Weather Statement	BMX	41 min
Jul 18, 10:41 AM CDT	Flash Flood Warning	BMX	3 hr
Jul 18, 1:29 PM CDT	Areal Flood Warning	BMX	3 hr
Jul 20, 2:17 PM CDT	Mesoscale Discussion	SPC	2 hr
Jul 23, 4:39 PM CDT	Heat Advisory	BMX	26 hr
Jul 24, 3:07 PM CDT	Heat Advisory	BMX	30 hr
Jul 27, 3:09 PM CDT	Special Weather Statement	BMX	36 min
Jul 27, 3:48 PM CDT	Special Weather Statement	BMX	27 min
Jul 30, 11:21 PM CDT	Mesoscale Discussion	SPC	114 min
Jul 31, 1:02 AM CDT	Mesoscale Discussion	SPC	88 min
Jul 31, 1:23 AM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jul 31, 1:36 AM CDT	Areal Flood Advisory	BMX	3 hr
Jul 31, 1:40 AM CDT	Severe Thunderstorm Warning	BMX	65 min
Jul 31, 2:10 AM CDT	Flash Flood Warning	BMX	3 hr
Jul 31, 4:09 AM CDT	Severe Thunderstorm Warning	BMX	71 min
Jul 31, 4:38 AM CDT	Flash Flood Warning	BMX	3 hr
Jul 31, 4:40 AM CDT	Severe Thunderstorm Warning	BMX	39 min
Jul 31, 5:48 AM CDT	Mesoscale Discussion	SPC	57 min
Jul 31, 7:28 AM CDT	Flash Flood Warning	BMX	3 hr
Jul 31, 8:44 AM CDT	Severe Thunderstorm Warning	BMX	46 min
Jul 31, 9:08 AM CDT	Severe Thunderstorm Warning	BMX	26 min
Jul 31, 10:30 AM CDT	Areal Flood Warning	BMX	6 hr
Aug 3, 12:14 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Aug 3, 3:33 PM CDT	Mesoscale Discussion	SPC	57 min
Aug 9, 11:21 AM CDT	Areal Flood Advisory	BMX	114 min
Aug 9, 11:37 AM CDT	Severe Thunderstorm Warning	BMX	38 min
Aug 9, 5:21 PM CDT	Areal Flood Advisory	BMX	114 min
Aug 9, 5:41 PM CDT	Flash Flood Warning	BMX	3 hr
Aug 10, 2:55 PM CDT	Mesoscale Discussion	SPC	95 min
Aug 10, 6:12 PM CDT	Special Weather Statement	BMX	48 min
Aug 10, 6:57 PM CDT	Special Weather Statement	BMX	48 min
Aug 13, 12:21 PM CDT	Mesoscale Discussion	SPC	24 min
Aug 13, 12:38 PM CDT	Severe Thunderstorm Watch	SPC	4 hr
Aug 14, 12:29 AM CDT	Special Weather Statement	BMX	46 min
Aug 14, 1:11 AM CDT	Special Weather Statement	BMX	49 min
Aug 18, 6:48 AM CDT	Severe Thunderstorm Warning	BMX	24 min
Sep 2, 5:13 PM CDT	Mesoscale Discussion	SPC	62 min
Oct 1, 5:51 AM CDT	Mesoscale Discussion	SPC	114 min
Oct 1, 12:52 PM CDT	Mesoscale Discussion	SPC	53 min
Oct 3, 4:04 AM CDT	Dense Fog Advisory	BMX	5 hr
Oct 14, 7:50 PM CDT	Mesoscale Discussion	SPC	2 hr
Oct 17, 11:10 PM CDT	Mesoscale Discussion	SPC	95 min
Oct 28, 3:15 PM CDT	Wind Advisory	BMX	28 hr
Nov 1, 6:26 AM CDT	Red Flag Warning	BMX	13 hr
Nov 7, 7:51 PM CST	Frost Advisory	BMX	12 hr
Nov 8, 4:06 AM CST	Dense Fog Advisory	BMX	4 hr
Nov 8, 3:46 PM CST	Frost Advisory	BMX	15 hr
Nov 12, 3:14 PM CST	Freeze Warning	BMX	17 hr
Nov 13, 6:02 AM CST	Freeze Warning	BMX	26 hr
Nov 15, 10:05 PM CST	Frost Advisory	BMX	9 hr
Nov 16, 3:08 PM CST	Frost Advisory	BMX	16 hr
Nov 17, 2:14 PM CST	Frost Advisory	BMX	17 hr
Nov 23, 4:00 PM CST	Fire Weather Watch	BMX	24 hr
Nov 24, 3:40 PM CST	Red Flag Warning	BMX	25 hr
Dec 8, 4:06 PM CST	Dense Fog Advisory	BMX	17 hr
Dec 16, 9:05 PM CST	Special Weather Statement	BMX	55 min
Dec 19, 9:04 PM CST	Wind Advisory	BMX	23 hr
Dec 20, 8:25 AM CST	Special Weather Statement	BMX	50 min
Dec 20, 9:09 AM CST	Special Weather Statement	BMX	51 min
Dec 21, 5:32 AM CST	Red Flag Warning	BMX	11 hr
Dec 22, 10:09 AM CST	Red Flag Warning	BMX	7 hr
Dec 24, 5:57 PM CST	Dense Fog Advisory	BMX	16 hr
Dec 25, 10:10 AM CST	Dense Fog Advisory	BMX	110 min
Dec 25, 2:22 PM CST	Wind Advisory	BMX	25 hr
Dec 25, 4:34 PM CST	Mesoscale Discussion	SPC	26 min
Dec 25, 4:38 PM CST	Severe Thunderstorm Watch	SPC	5 hr
Dec 25, 6:05 PM CST	Mesoscale Discussion	SPC	85 min
Dec 25, 6:33 PM CST	Special Weather Statement	BMX	57 min
Dec 25, 6:45 PM CST	Severe Thunderstorm Warning	BMX	30 min
Dec 25, 7:00 PM CST	Areal Flood Advisory	BMX	3 hr
Dec 25, 7:08 PM CST	Severe Thunderstorm Warning	BMX	52 min
Dec 25, 7:08 PM CST	Mesoscale Discussion	SPC	67 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	31
Tornado Warning	1
Severe Thunderstorm Watch	10
Tornado Watch	5
Mesoscale Discussion	39
Special Weather Statement	38
Flooding
Areal Flood Warning	2
Flash Flood Warning	6
Areal Flood Advisory	9
Heat
Excessive Heat Warning	1
Heat Advisory	5
Cold
Freeze Warning	2
Hard Freeze Warning	1
Hard Freeze Watch	1
Frost Advisory	5
Wind and dust
Wind Advisory	11
Fire
Red Flag Warning	16
Fire Weather Watch	9
Fog and smoke
Dense Fog Advisory	13

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2011 2013

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.