Alert archive / Alabama / Shelby County
Weather alerts in Shelby County, Alabama, 2018
155 weather alerts in 2018, 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 2018. Tap one for its archive.
- Alerts
- 155
- Warnings
- 23
- Watches
- 20
- Advisories
- 64
- Busiest month
- June27 alerts
- Busiest day
- April 14, 20185 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Shelby County, 2018
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 7 | 5 | 29% | 16 | 63% | 35 min |
| Flash flood warnings | 1 | 0 | 100% | 0 |
Each office's whole area, 2018
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Birmingham, AL: tornado warnings | 24 | 6 | 75% | 29 | 45% | 18 min |
| NWS Birmingham, AL: severe thunderstorm warnings | 119 | 75 | 37% | 363 | 54% | 24 min |
| NWS Birmingham, AL: flash flood warnings | 40 | 22 | 45% | 61 | 92% | 97 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 9, 9:21 PM CST | Dense Fog Advisory | BMX | 8 hr |
| Jan 12, 2:57 AM CST | Wind Advisory | BMX | 11 hr |
| Jan 15, 3:29 AM CST | Winter Storm Watch | BMX | 10 hr |
| Jan 15, 3:40 AM CST | Hard Freeze Watch | BMX | 32 hr |
| Jan 15, 1:45 PM CST | Winter Weather Advisory | BMX | 42 hr |
| Jan 16, 2:36 AM CST | Wind Chill Advisory | BMX | 33 hr |
| Jan 16, 11:12 AM CST | Hard Freeze Warning | BMX | 46 hr |
| Feb 7, 4:44 AM CST | Special Weather Statement | BMX | 46 min |
| Feb 7, 6:07 AM CST | Areal Flood Advisory | BMX | 113 min |
| Feb 9, 1:45 PM CST | Flood Watch | BMX | 52 hr |
| Feb 10, 7:02 AM CST | Dense Fog Advisory | BMX | 118 min |
| Feb 11, 5:01 PM CST | Areal Flood Advisory | BMX | 119 min |
| Feb 11, 7:14 PM CST | Areal Flood Advisory | BMX | 2 hr |
| Mar 1, 2:47 AM CST | Wind Advisory | BMX | 14 hr |
| Mar 1, 8:13 AM CST | Special Weather Statement | BMX | 47 min |
| Mar 1, 8:54 AM CST | Special Weather Statement | BMX | 36 min |
| Mar 7, 3:48 AM CST | Freeze Watch | BMX | 24 hr |
| Mar 7, 3:48 AM CST | Freeze Warning | BMX | 28 hr |
| Mar 8, 4:11 AM CST | Freeze Warning | BMX | 28 hr |
| Mar 12, 3:19 AM CDT | Freeze Watch | BMX | 24 hr |
| Mar 12, 3:19 AM CDT | Freeze Warning | BMX | 30 hr |
| Mar 12, 3:19 AM CDT | Wind Advisory | BMX | 16 hr |
| Mar 13, 3:33 AM CDT | Freeze Watch | BMX | 24 hr |
| Mar 13, 3:33 AM CDT | Freeze Warning | BMX | 30 hr |
| Mar 14, 3:23 AM CDT | Freeze Warning | BMX | 30 hr |
| Mar 19, 5:07 AM CDT | Dense Fog Advisory | BMX | 4 hr |
| Mar 19, 3:28 PM CDT | Tornado Watch | SPC | 9 hr |
| Mar 20, 3:06 AM CDT | Wind Advisory | BMX | 19 hr |
| Mar 21, 2:54 AM CDT | Freeze Warning | BMX | 29 hr |
| Mar 21, 12:57 PM CDT | Wind Advisory | BMX | 6 hr |
| Apr 3, 9:47 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Apr 3, 11:09 PM CDT | Mesoscale Discussion | SPC | 66 min |
| Apr 4, 12:03 AM CDT | Special Weather Statement | BMX | 57 min |
| Apr 4, 3:14 AM CDT | Freeze Warning | BMX | 29 hr |
| Apr 6, 3:06 AM CDT | Freeze Watch | BMX | 23 hr |
| Apr 7, 2:30 AM CDT | Freeze Warning | BMX | 31 hr |
| Apr 7, 2:30 AM CDT | Wind Advisory | BMX | 24 hr |
| Apr 13, 4:40 PM CDT | Flash Flood Watch | BMX | 36 hr |
| Apr 14, 9:40 AM CDT | Mesoscale Discussion | SPC | 95 min |
| Apr 14, 10:36 AM CDT | Tornado Watch | SPC | 8 hr |
| Apr 14, 12:41 PM CDT | Mesoscale Discussion | SPC | 94 min |
| Apr 14, 2:35 PM CDT | Areal Flood Advisory | BMX | 4 hr |
| Apr 14, 2:56 PM CDT | Mesoscale Discussion | SPC | 94 min |
| Apr 14, 7:49 PM CDT | Areal Flood Advisory | BMX | 3 hr |
| Apr 14, 11:18 PM CDT | Areal Flood Advisory | BMX | 6 hr |
| Apr 15, 3:36 AM CDT | Wind Advisory | BMX | 18 hr |
| Apr 15, 8:52 AM CDT | River Flood Warning | BMX | 12 hr |
| Apr 16, 9:19 AM CDT | Wind Advisory | BMX | 11 hr |
| Apr 16, 2:33 PM CDT | Frost Advisory | BMX | 18 hr |
| Apr 22, 3:14 AM CDT | Wind Advisory | BMX | 25 hr |
| Apr 22, 3:58 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Apr 22, 7:57 PM CDT | Severe Thunderstorm Warning | BMX | 78 min |
| Apr 22, 8:01 PM CDT | Areal Flood Advisory | BMX | 119 min |
| May 6, 12:53 AM CDT | Dense Fog Advisory | BMX | 8 hr |
| May 16, 9:48 PM CDT | Areal Flood Advisory | BMX | 117 min |
| May 23, 7:03 AM CDT | Dense Fog Advisory | BMX | 117 min |
| May 24, 3:48 AM CDT | Dense Fog Advisory | BMX | 5 hr |
| May 24, 1:56 PM CDT | Special Weather Statement | BMX | 34 min |
| May 25, 2:15 PM CDT | Areal Flood Advisory | BMX | 2 hr |
| May 28, 2:38 AM CDT | Wind Advisory | BMX | 35 hr |
| May 28, 2:45 AM CDT | Flash Flood Watch | BMX | 40 hr |
| May 30, 5:11 AM CDT | Areal Flood Advisory | BMX | 3 hr |
| May 30, 5:18 AM CDT | Flash Flood Watch | BMX | 14 hr |
| Jun 1, 12:25 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 1, 1:29 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jun 1, 3:32 PM CDT | Special Weather Statement | BMX | 28 min |
| Jun 3, 2:24 PM CDT | Mesoscale Discussion | SPC | 66 min |
| Jun 9, 8:04 PM CDT | Areal Flood Advisory | BMX | 3 hr |
| Jun 9, 8:12 PM CDT | Special Weather Statement | BMX | 33 min |
| Jun 10, 8:03 PM CDT | Severe Thunderstorm Warning | BMX | 27 min |
| Jun 11, 5:03 AM CDT | Dense Fog Advisory | BMX | 3 hr |
| Jun 15, 4:58 AM CDT | Dense Fog Advisory | BMX | 4 hr |
| Jun 16, 7:17 PM CDT | Special Weather Statement | BMX | 43 min |
| Jun 16, 8:02 PM CDT | Special Weather Statement | BMX | 28 min |
| Jun 16, 8:53 PM CDT | Areal Flood Advisory | BMX | 2 hr |
| Jun 17, 2:42 PM CDT | Special Weather Statement | BMX | 33 min |
| Jun 17, 3:45 PM CDT | Areal Flood Advisory | BMX | 2 hr |
| Jun 18, 5:10 AM CDT | Dense Fog Advisory | BMX | 3 hr |
| Jun 22, 5:03 PM CDT | Special Weather Statement | BMX | 27 min |
| Jun 25, 4:40 AM CDT | Heat Advisory | BMX | 14 hr |
| Jun 25, 2:31 PM CDT | Special Weather Statement | BMX | 29 min |
| Jun 26, 3:54 PM CDT | Heat Advisory | BMX | 27 hr |
| Jun 27, 4:31 PM CDT | Special Weather Statement | BMX | 29 min |
| Jun 27, 5:18 PM CDT | Special Weather Statement | BMX | 27 min |
| Jun 27, 5:24 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 27, 7:56 PM CDT | Heat Advisory | BMX | 23 hr |
| Jun 28, 10:46 AM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 28, 1:07 PM CDT | Mesoscale Discussion | SPC | 113 min |
| Jun 28, 2:29 PM CDT | Severe Thunderstorm Warning | BMX | 61 min |
| Jun 28, 2:53 PM CDT | Severe Thunderstorm Warning | BMX | 82 min |
| Jul 4, 2:48 AM CDT | Severe Thunderstorm Warning | BMX | 42 min |
| Jul 4, 1:11 PM CDT | Special Weather Statement | BMX | 34 min |
| Jul 4, 3:02 PM CDT | Mesoscale Discussion | SPC | 58 min |
| Jul 4, 4:58 PM CDT | Special Weather Statement | BMX | 47 min |
| Jul 11, 2:58 PM CDT | Special Weather Statement | BMX | 32 min |
| Jul 11, 3:19 PM CDT | Areal Flood Advisory | BMX | 116 min |
| Jul 11, 3:22 PM CDT | Special Weather Statement | BMX | 23 min |
| Jul 13, 3:56 AM CDT | Heat Advisory | BMX | 15 hr |
| Jul 13, 3:11 PM CDT | Areal Flood Advisory | BMX | 2 hr |
| Jul 14, 3:02 AM CDT | Heat Advisory | BMX | 16 hr |
| Jul 15, 7:00 PM CDT | Areal Flood Advisory | BMX | 2 hr |
| Jul 15, 7:33 PM CDT | Flash Flood Warning | BMX | 117 min |
| Jul 15, 7:40 PM CDT | Areal Flood Advisory | BMX | 2 hr |
| Jul 16, 10:48 PM CDT | Areal Flood Advisory | BMX | 117 min |
| Jul 18, 2:46 PM CDT | Special Weather Statement | BMX | 29 min |
| Jul 21, 9:51 PM CDT | Special Weather Statement | BMX | 24 min |
| Jul 21, 10:02 PM CDT | Special Weather Statement | BMX | 28 min |
| Jul 30, 7:48 PM CDT | Areal Flood Advisory | BMX | 3 hr |
| Jul 31, 12:51 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 31, 1:43 PM CDT | Flash Flood Watch | BMX | 37 hr |
| Jul 31, 4:19 PM CDT | Special Weather Statement | BMX | 26 min |
| Jul 31, 4:45 PM CDT | Areal Flood Advisory | BMX | 3 hr |
| Aug 1, 10:19 AM CDT | Areal Flood Advisory | BMX | 3 hr |
| Aug 1, 12:28 PM CDT | Areal Flood Advisory | BMX | 3 hr |
| Aug 3, 4:26 AM CDT | Dense Fog Advisory | BMX | 5 hr |
| Aug 8, 4:55 PM CDT | Special Weather Statement | BMX | 35 min |
| Aug 8, 5:19 PM CDT | Special Weather Statement | BMX | 26 min |
| Aug 8, 5:28 PM CDT | Special Weather Statement | BMX | 32 min |
| Aug 10, 7:22 PM CDT | Severe Thunderstorm Warning | BMX | 23 min |
| Aug 10, 7:42 PM CDT | Special Weather Statement | BMX | 33 min |
| Aug 10, 7:43 PM CDT | Severe Thunderstorm Warning | BMX | 29 min |
| Aug 12, 1:55 PM CDT | Special Weather Statement | BMX | 35 min |
| Aug 12, 2:28 PM CDT | Special Weather Statement | BMX | 32 min |
| Aug 12, 2:54 PM CDT | Special Weather Statement | BMX | 36 min |
| Sep 24, 4:57 PM CDT | Special Weather Statement | BMX | 48 min |
| Sep 26, 6:58 AM CDT | Flash Flood Watch | BMX | 35 hr |
| Sep 26, 11:51 AM CDT | Areal Flood Advisory | BMX | 3 hr |
| Nov 1, 5:27 AM CDT | Tornado Watch | SPC | 7 hr |
| Nov 1, 7:50 AM CDT | Mesoscale Discussion | SPC | 115 min |
| Nov 6, 5:10 AM CST | Special Weather Statement | BMX | 50 min |
| Nov 7, 11:32 AM CST | Special Weather Statement | BMX | 43 min |
| Nov 7, 11:54 AM CST | Special Weather Statement | BMX | 36 min |
| Nov 7, 12:13 PM CST | Special Weather Statement | BMX | 32 min |
| Nov 9, 12:50 PM CST | Freeze Watch | BMX | 20 hr |
| Nov 10, 8:52 AM CST | Freeze Warning | BMX | 23 hr |
| Nov 12, 4:29 PM CST | Areal Flood Advisory | BMX | 2 hr |
| Nov 14, 2:58 AM CST | Freeze Warning | BMX | 54 hr |
| Nov 18, 2:39 AM CST | Dense Fog Advisory | BMX | 5 hr |
| Nov 24, 7:22 PM CST | Dense Fog Advisory | BMX | 15 hr |
| Dec 1, 3:07 PM CST | Mesoscale Discussion | SPC | 113 min |
| Dec 8, 8:46 PM CST | Areal Flood Advisory | BMX | 3 hr |
| Dec 8, 10:44 PM CST | Wind Advisory | BMX | 3 hr |
| Dec 11, 2:59 AM CST | Freezing Fog Advisory | BMX | 7 hr |
| Dec 17, 2:33 AM CST | Dense Fog Advisory | BMX | 7 hr |
| Dec 18, 12:42 AM CST | Dense Fog Advisory | BMX | 9 hr |
| Dec 26, 1:54 PM CST | Wind Advisory | BMX | 34 hr |
| Dec 26, 2:07 PM CST | Flash Flood Watch | BMX | 45 hr |
| Dec 27, 1:28 PM CST | River Flood Warning | BMX | 43 hr |
| Dec 27, 2:09 PM CST | Special Weather Statement | BMX | 36 min |
| Dec 27, 8:52 PM CST | Areal Flood Advisory | BMX | 53 min |
| Dec 28, 6:24 AM CST | Areal Flood Advisory | BMX | 3 hr |
| Dec 28, 8:13 AM CST | Areal Flood Warning | BMX | 6 hr |
| Dec 28, 9:38 PM CST | Dense Fog Advisory | BMX | 10 hr |
| Dec 29, 11:34 AM CST | River Flood Warning | BMX | 22 hr |
| Dec 30, 6:08 PM CST | Dense Fog Advisory | BMX | 13 hr |
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20172019
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.