Weather alerts in Shelby County, Alabama, 2017

164 weather alerts in 2017, 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 2017. Tap one for its archive.

Alerts: 164
Warnings: 33
Watches: 20
Advisories: 60
Busiest month: April25 alerts
Busiest day: April 5, 201715 alerts

Over time

By month

Warning verification

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

0 of 2 tornado warnings covering Shelby County in 2017 had a tornado report inside them; 0 of 1 tornado reports fell inside a warning.

Shelby County, 2017

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	2	0	100%	1	0%
Severe thunderstorm warnings	15	13	13%	20	80%	31 min
Flash flood warnings	4	3	25%	1	100%	8 min

Each office's whole area, 2017

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Birmingham, AL: tornado warnings	59	22	63%	63	73%	14 min
NWS Birmingham, AL: severe thunderstorm warnings	170	108	36%	708	57%	21 min
NWS Birmingham, AL: flash flood warnings	36	29	19%	145	89%	77 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, 7:11 PM CST	Dense Fog Advisory	BMX	14 hr
Jan 2, 9:48 AM CST	Areal Flood Warning	BMX	117 min
Jan 2, 10:35 AM CST	Special Weather Statement	BMX	40 min
Jan 2, 11:45 AM CST	Areal Flood Advisory	BMX	2 hr
Jan 4, 3:10 PM CST	Winter Storm Watch	BMX	24 hr
Jan 5, 3:07 PM CST	Winter Storm Warning	BMX	42 hr
Jan 6, 4:15 PM CST	Mesoscale Discussion	SPC	4 hr
Jan 7, 11:55 AM CST	Hard Freeze Warning	BMX	22 hr
Jan 19, 3:10 PM CST	Mesoscale Discussion	SPC	2 hr
Jan 21, 3:00 AM CST	Mesoscale Discussion	SPC	90 min
Jan 21, 3:56 AM CST	Tornado Watch	SPC	8 hr
Jan 21, 6:51 PM CST	Tornado Watch PDS	SPC	8 hr
Jan 21, 8:30 PM CST	Mesoscale Discussion	SPC	90 min
Jan 21, 10:21 PM CST	Severe Thunderstorm Warning	BMX	19 min
Jan 22, 1:04 AM CST	Severe Thunderstorm Warning	BMX	41 min
Jan 22, 9:06 AM CST	Wind Advisory	BMX	33 hr
Jan 22, 1:02 PM CST	Areal Flood Advisory	BMX	3 hr
Jan 22, 1:24 PM CST	Areal Flood Advisory	BMX	3 hr
Feb 6, 9:51 PM CST	Dense Fog Advisory	BMX	8 hr
Feb 8, 1:29 AM CST	Dense Fog Advisory	BMX	7 hr
Feb 19, 12:39 AM CST	Dense Fog Advisory	BMX	8 hr
Feb 27, 10:25 PM CST	Dense Fog Advisory	BMX	11 hr
Mar 1, 3:43 PM CST	Severe Thunderstorm Watch	SPC	4 hr
Mar 1, 4:31 PM CST	Special Weather Statement	BMX	29 min
Mar 7, 1:40 PM CST	Mesoscale Discussion	SPC	65 min
Mar 7, 2:46 PM CST	Severe Thunderstorm Warning	BMX	36 min
Mar 10, 2:36 AM CST	Severe Thunderstorm Warning	BMX	54 min
Mar 10, 3:09 AM CST	Mesoscale Discussion	SPC	96 min
Mar 13, 3:19 PM CDT	Freeze Warning	BMX	43 hr
Mar 14, 2:40 AM CDT	Freeze Warning	BMX	55 hr
Mar 27, 1:49 PM CDT	Mesoscale Discussion	SPC	56 min
Mar 27, 1:54 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Mar 27, 3:33 PM CDT	Mesoscale Discussion	SPC	87 min
Apr 3, 1:51 AM CDT	Mesoscale Discussion	SPC	114 min
Apr 3, 6:46 AM CDT	Special Weather Statement	BMX	29 min
Apr 5, 1:37 AM CDT	Severe Thunderstorm Watch	SPC	6 hr
Apr 5, 3:41 AM CDT	Mesoscale Discussion	SPC	2 hr
Apr 5, 4:45 AM CDT	Severe Thunderstorm Warning	BMX	44 min
Apr 5, 6:15 AM CDT	Mesoscale Discussion	SPC	90 min
Apr 5, 6:52 AM CDT	Severe Thunderstorm Warning	BMX	83 min
Apr 5, 6:54 AM CDT	Tornado Watch	SPC	8 hr
Apr 5, 8:43 AM CDT	Areal Flood Advisory	BMX	3 hr
Apr 5, 11:55 AM CDT	Severe Thunderstorm Warning	BMX	66 min
Apr 5, 1:50 PM CDT	Tornado Watch	SPC	8 hr
Apr 5, 3:51 PM CDT	Mesoscale Discussion	SPC	84 min
Apr 5, 4:37 PM CDT	Wind Advisory	BMX	26 hr
Apr 5, 5:30 PM CDT	Severe Thunderstorm Warning	BMX	45 min
Apr 5, 5:55 PM CDT	Severe Thunderstorm Warning	BMX	35 min
Apr 5, 6:32 PM CDT	Severe Thunderstorm Warning	BMX	27 min
Apr 5, 6:57 PM CDT	Mesoscale Discussion	SPC	48 min
Apr 22, 6:40 PM CDT	Mesoscale Discussion	SPC	65 min
Apr 26, 11:02 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Apr 27, 1:36 AM CDT	Mesoscale Discussion	SPC	114 min
Apr 29, 3:06 AM CDT	Wind Advisory	BMX	16 hr
Apr 29, 4:33 PM CDT	Wind Advisory	BMX	50 hr
Apr 30, 10:06 AM CDT	Mesoscale Discussion	SPC	84 min
Apr 30, 10:36 AM CDT	Tornado Watch	SPC	8 hr
Apr 30, 2:01 PM CDT	Special Weather Statement	BMX	74 min
May 3, 3:19 PM CDT	Wind Advisory	BMX	30 hr
May 12, 10:56 AM CDT	Mesoscale Discussion	SPC	3 hr
May 20, 2:12 PM CDT	Mesoscale Discussion	SPC	93 min
May 20, 4:12 PM CDT	Special Weather Statement	BMX	33 min
May 20, 4:44 PM CDT	Special Weather Statement	BMX	31 min
May 20, 5:31 PM CDT	Areal Flood Advisory	BMX	119 min
May 20, 6:08 PM CDT	Flash Flood Warning	BMX	97 min
May 20, 7:45 PM CDT	Flash Flood Warning	BMX	3 hr
May 22, 3:53 PM CDT	Areal Flood Advisory	BMX	2 hr
May 24, 6:41 AM CDT	Mesoscale Discussion	SPC	3 hr
May 27, 11:46 PM CDT	Mesoscale Discussion	SPC	59 min
May 28, 2:11 AM CDT	Mesoscale Discussion	SPC	2 hr
May 28, 2:53 AM CDT	Severe Thunderstorm Watch	SPC	4 hr
May 30, 4:21 PM CDT	Special Weather Statement	BMX	24 min
Jun 5, 3:29 PM CDT	Areal Flood Advisory	BMX	2 hr
Jun 5, 3:57 PM CDT	Special Weather Statement	BMX	33 min
Jun 6, 5:56 AM CDT	Areal Flood Advisory	BMX	3 hr
Jun 15, 3:04 PM CDT	Special Weather Statement	BMX	56 min
Jun 15, 3:15 PM CDT	Severe Thunderstorm Warning	BMX	60 min
Jun 18, 6:00 PM CDT	Special Weather Statement	BMX	60 min
Jun 21, 3:26 AM CDT	Flash Flood Watch	BMX	64 hr
Jun 22, 12:49 PM CDT	Areal Flood Advisory	BMX	3 hr
Jun 22, 1:04 PM CDT	Tornado Watch	SPC	9 hr
Jun 22, 2:43 PM CDT	Tornado Warning Tornado observed	BMX	12 min
Jun 22, 3:48 PM CDT	Mesoscale Discussion	SPC	87 min
Jun 22, 3:58 PM CDT	Areal Flood Warning	BMX	3 hr
Jun 22, 8:57 PM CDT	Mesoscale Discussion	SPC	63 min
Jun 23, 10:54 AM CDT	Mesoscale Discussion	SPC	96 min
Jun 23, 3:13 PM CDT	Special Weather Statement	BMX	47 min
Jun 23, 3:17 PM CDT	Mesoscale Discussion	SPC	118 min
Jun 23, 3:23 PM CDT	Special Weather Statement	BMX	67 min
Jun 23, 3:31 PM CDT	Areal Flood Advisory	BMX	3 hr
Jun 23, 5:29 PM CDT	Areal Flood Advisory	BMX	3 hr
Jun 23, 5:32 PM CDT	Areal Flood Warning	BMX	3 hr
Jun 24, 6:02 PM CDT	Areal Flood Warning	BMX	118 min
Jul 5, 4:41 PM CDT	Severe Thunderstorm Warning	BMX	34 min
Jul 5, 5:02 PM CDT	Areal Flood Advisory	BMX	3 hr
Jul 6, 3:23 PM CDT	Special Weather Statement	BMX	52 min
Jul 6, 4:09 PM CDT	Special Weather Statement	BMX	36 min
Jul 15, 5:20 PM CDT	Special Weather Statement	BMX	25 min
Jul 15, 5:29 PM CDT	Areal Flood Advisory	BMX	2 hr
Jul 15, 5:42 PM CDT	Flash Flood Warning	BMX	2 hr
Jul 16, 8:48 AM CDT	Areal Flood Warning	BMX	3 hr
Jul 17, 3:13 PM CDT	Severe Thunderstorm Warning	BMX	32 min
Jul 17, 3:45 PM CDT	Special Weather Statement	BMX	45 min
Jul 20, 2:54 PM CDT	Special Weather Statement	BMX	36 min
Jul 21, 11:45 AM CDT	Heat Advisory	BMX	7 hr
Jul 22, 3:00 AM CDT	Heat Advisory	BMX	18 hr
Jul 23, 3:16 AM CDT	Heat Advisory	BMX	18 hr
Jul 24, 2:22 PM CDT	Special Weather Statement	BMX	23 min
Jul 26, 12:29 PM CDT	Heat Advisory	BMX	9 hr
Jul 26, 12:43 PM CDT	Special Weather Statement	BMX	32 min
Jul 26, 12:55 PM CDT	Areal Flood Advisory	BMX	3 hr
Jul 26, 1:13 PM CDT	Flash Flood Warning	BMX	3 hr
Jul 27, 3:32 PM CDT	Flash Flood Watch	BMX	27 hr
Aug 3, 4:41 PM CDT	Areal Flood Advisory	BMX	2 hr
Aug 8, 9:12 AM CDT	Areal Flood Advisory	BMX	2 hr
Aug 8, 9:54 AM CDT	Flash Flood Watch	BMX	33 hr
Aug 10, 9:38 PM CDT	Areal Flood Advisory	BMX	3 hr
Aug 11, 3:10 AM CDT	Flash Flood Watch	BMX	16 hr
Aug 11, 4:55 AM CDT	Dense Fog Advisory	BMX	3 hr
Aug 12, 4:49 AM CDT	Dense Fog Advisory	BMX	4 hr
Aug 15, 3:54 PM CDT	Special Weather Statement	BMX	36 min
Aug 31, 11:13 AM CDT	Tornado Watch	SPC	11 hr
Aug 31, 2:49 PM CDT	Wind Advisory	BMX	27 hr
Aug 31, 5:47 PM CDT	Mesoscale Discussion	SPC	88 min
Aug 31, 8:31 PM CDT	Areal Flood Advisory	BMX	119 min
Aug 31, 8:33 PM CDT	Special Weather Statement	BMX	72 min
Aug 31, 8:41 PM CDT	Severe Thunderstorm Warning	BMX	49 min
Aug 31, 9:14 PM CDT	Severe Thunderstorm Warning	BMX	46 min
Sep 5, 2:36 PM CDT	Mesoscale Discussion	SPC	54 min
Sep 10, 4:07 PM CDT	Wind Advisory	BMX	36 hr
Sep 17, 3:19 AM CDT	Dense Fog Advisory	BMX	6 hr
Sep 18, 12:31 AM CDT	Dense Fog Advisory	BMX	8 hr
Sep 19, 3:00 PM CDT	Special Weather Statement	BMX	45 min
Sep 19, 10:58 PM CDT	Dense Fog Advisory	BMX	11 hr
Oct 6, 4:14 PM CDT	Tropical Storm Watch	BMX	42 hr
Oct 7, 2:51 AM CDT	Flash Flood Watch	BMX	35 hr
Oct 7, 4:27 AM CDT	Tropical Storm Warning	BMX	30 hr
Oct 7, 12:25 PM CDT	Wind Advisory	BMX	31 hr
Oct 7, 8:57 PM CDT	Tornado Warning	BMX	33 min
Oct 7, 9:59 PM CDT	Areal Flood Advisory	BMX	3 hr
Oct 10, 10:14 PM CDT	Dense Fog Advisory	BMX	11 hr
Oct 29, 3:07 AM CDT	Frost Advisory	BMX	29 hr
Nov 3, 9:18 PM CDT	Dense Fog Advisory	BMX	12 hr
Nov 5, 3:36 AM CST	Dense Fog Advisory	BMX	5 hr
Nov 6, 8:26 PM CST	Dense Fog Advisory	BMX	13 hr
Nov 9, 10:06 PM CST	Dense Fog Advisory	BMX	9 hr
Nov 13, 3:28 AM CST	Dense Fog Advisory	BMX	5 hr
Nov 18, 10:04 AM CST	Wind Advisory	BMX	16 hr
Nov 18, 3:23 PM CST	Freeze Watch	BMX	11 hr
Nov 18, 7:03 PM CST	Special Weather Statement	BMX	57 min
Nov 19, 2:45 AM CST	Freeze Warning	BMX	29 hr
Nov 29, 9:27 PM CST	Dense Fog Advisory	BMX	12 hr
Nov 30, 6:07 PM CST	Dense Fog Advisory	BMX	15 hr
Dec 1, 3:00 PM CST	Dense Fog Advisory	BMX	18 hr
Dec 2, 2:24 PM CST	Dense Fog Advisory	BMX	19 hr
Dec 3, 11:39 PM CST	Dense Fog Advisory	BMX	6 hr
Dec 7, 3:34 AM CST	Winter Weather Advisory	BMX	51 hr
Dec 8, 2:13 AM CST	Winter Storm Warning	BMX	29 hr
Dec 8, 7:55 AM CST	Mesoscale Discussion	SPC	3 hr
Dec 17, 8:31 PM CST	Dense Fog Advisory	BMX	12 hr
Dec 18, 5:48 PM CST	Dense Fog Advisory	BMX	17 hr
Dec 19, 6:37 PM CST	Dense Fog Advisory	BMX	11 hr
Dec 20, 8:36 AM CST	Areal Flood Advisory	BMX	3 hr
Dec 30, 2:54 AM CST	Winter Weather Advisory	BMX	34 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	15
Tornado Warning	2
Severe Thunderstorm Watch	5
Tornado Watch	7
Mesoscale Discussion	28
Special Weather Statement	23
Flooding
Areal Flood Warning	5
Flash Flood Warning	4
Flash Flood Watch	5
Areal Flood Advisory	20
Winter
Winter Storm Warning	2
Winter Storm Watch	1
Winter Weather Advisory	2
Heat
Heat Advisory	4
Cold
Freeze Warning	3
Hard Freeze Warning	1
Freeze Watch	1
Frost Advisory	1
Wind and dust
Wind Advisory	9
Fog and smoke
Dense Fog Advisory	24
Tropical
Tropical Storm Warning	1
Tropical Storm Watch	1

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2016 2018

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.