Alert archive / Alabama / Shelby County
Weather alerts in Shelby County, Alabama, 2019
142 weather alerts in 2019, 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 2019. Tap one for its archive.
- Alerts
- 142
- Warnings
- 21
- Watches
- 16
- Advisories
- 44
- Busiest month
- April20 alerts
- Busiest day
- April 14, 20198 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
3 of 3 tornado warnings covering Shelby County in 2019 had a tornado report inside them; 8 of 9 tornado reports fell inside a warning, on average 4 minutes after it went out.
Shelby County, 2019
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 3 | 3 | 0% | 9 | 89% | 4 min |
| Severe thunderstorm warnings | 4 | 4 | 0% | 36 | 28% | 22 min |
| Flash flood warnings | 1 | 1 | 0% | 2 | 100% | 43 min |
Each office's whole area, 2019
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Birmingham, AL: tornado warnings | 66 | 33 | 50% | 99 | 75% | 19 min |
| NWS Birmingham, AL: severe thunderstorm warnings | 164 | 111 | 32% | 527 | 58% | 22 min |
| NWS Birmingham, AL: flash flood warnings | 6 | 3 | 50% | 9 | 100% | 46 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 17, 9:37 PM CST | Dense Fog Advisory | BMX | 12 hr |
| Jan 19, 3:25 AM CST | Wind Advisory | BMX | 33 hr |
| Jan 19, 9:43 AM CST | Tornado Watch | SPC | 7 hr |
| Jan 19, 11:37 AM CST | Mesoscale Discussion | SPC | 83 min |
| Jan 23, 4:19 AM CST | Wind Advisory | BMX | 16 hr |
| Jan 23, 4:33 PM CST | Areal Flood Advisory | BMX | 3 hr |
| Jan 23, 5:00 PM CST | Areal Flood Advisory | BMX | 6 hr |
| Jan 23, 8:09 PM CST | River Flood Warning | BMX | 38 hr |
| Jan 27, 3:14 PM CST | Winter Storm Watch | BMX | 13 hr |
| Jan 28, 3:52 AM CST | Winter Storm Warning | BMX | 25 hr |
| Jan 28, 3:52 AM CST | Winter Weather Advisory | BMX | 29 hr |
| Feb 3, 10:34 PM CST | Dense Fog Advisory | BMX | 11 hr |
| Feb 5, 7:36 AM CST | Dense Fog Advisory | BMX | 2 hr |
| Feb 12, 9:38 AM CST | Mesoscale Discussion | SPC | 2 hr |
| Feb 18, 3:22 PM CST | Flood Watch | BMX | 6 days |
| Feb 19, 8:26 AM CST | River Flood Warning | BMX | 23 hr |
| Feb 20, 10:24 PM CST | Dense Fog Advisory | BMX | 11 hr |
| Feb 21, 10:10 AM CST | River Flood Warning | BMX | 12 days |
| Feb 21, 10:10 AM CST | River Flood Warning | BMX | 21 days |
| Feb 21, 5:49 PM CST | Special Weather Statement | BMX | 26 min |
| Feb 21, 6:24 PM CST | Special Weather Statement | BMX | 36 min |
| Feb 21, 7:48 PM CST | River Flood Warning | BMX | 15 days |
| Feb 22, 8:05 AM CST | Areal Flood Advisory | BMX | 3 hr |
| Feb 23, 3:01 PM CST | Tornado Watch | SPC | 6 hr |
| Feb 23, 7:51 PM CST | Mesoscale Discussion | SPC | 114 min |
| Mar 3, 12:24 PM CST | Areal Flood Advisory | BMX | 4 hr |
| Mar 3, 5:03 PM CST | Freeze Warning | BMX | 17 hr |
| Mar 4, 4:19 AM CST | Freeze Warning | BMX | 3 days |
| Mar 13, 9:46 PM CDT | Wind Advisory | BMX | 20 hr |
| Mar 14, 12:11 PM CDT | Tornado Watch | SPC | 7 hr |
| Mar 14, 5:39 PM CDT | Mesoscale Discussion | SPC | 96 min |
| Mar 14, 6:41 PM CDT | Tornado Watch | SPC | 5 hr |
| Mar 14, 8:57 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Mar 25, 2:49 PM CDT | Mesoscale Discussion | SPC | 116 min |
| Mar 25, 3:50 PM CDT | Special Weather Statement | BMX | 25 min |
| Mar 25, 4:09 PM CDT | Special Weather Statement | BMX | 36 min |
| Mar 25, 4:43 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Apr 6, 7:09 PM CDT | Mesoscale Discussion | SPC | 96 min |
| Apr 6, 8:46 PM CDT | Special Weather Statement | BMX | 29 min |
| Apr 6, 8:55 PM CDT | Areal Flood Advisory | BMX | 2 hr |
| Apr 6, 9:14 PM CDT | Special Weather Statement | BMX | 61 min |
| Apr 7, 5:36 PM CDT | Mesoscale Discussion | SPC | 114 min |
| Apr 9, 9:19 AM CDT | Areal Flood Advisory | BMX | 3 hr |
| Apr 10, 12:38 AM CDT | Dense Fog Advisory | BMX | 8 hr |
| Apr 13, 5:04 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 13, 7:11 PM CDT | Tornado Watch | SPC | 11 hr |
| Apr 13, 7:14 PM CDT | Special Weather Statement | BMX | 31 min |
| Apr 13, 9:13 PM CDT | Mesoscale Discussion | SPC | 92 min |
| Apr 14, 12:15 AM CDT | Wind Advisory | BMX | 21 hr |
| Apr 14, 4:04 AM CDT | Tornado Warning | BMX | 25 min |
| Apr 14, 4:14 AM CDT | Tornado Warning | BMX | 20 min |
| Apr 14, 4:20 AM CDT | Mesoscale Discussion | SPC | 115 min |
| Apr 14, 5:36 AM CDT | Mesoscale Discussion | SPC | 54 min |
| Apr 18, 3:12 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 18, 3:49 PM CDT | Tornado Watch | SPC | 7 hr |
| Apr 18, 5:58 PM CDT | Mesoscale Discussion | SPC | 92 min |
| Apr 18, 6:53 PM CDT | Severe Thunderstorm Warning | BMX | 82 min |
| May 9, 12:03 PM CDT | Mesoscale Discussion | SPC | 57 min |
| May 9, 12:09 PM CDT | Special Weather Statement | BMX | 81 min |
| May 11, 3:27 PM CDT | Mesoscale Discussion | SPC | 63 min |
| May 16, 6:00 PM CDT | Special Weather Statement | BMX | 45 min |
| May 16, 6:44 PM CDT | Special Weather Statement | BMX | 46 min |
| May 17, 5:06 PM CDT | Special Weather Statement | BMX | 24 min |
| Jun 6, 11:18 PM CDT | Areal Flood Advisory | BMX | 3 hr |
| Jun 7, 12:38 PM CDT | Special Weather Statement | BMX | 37 min |
| Jun 9, 5:19 AM CDT | Areal Flood Advisory | BMX | 116 min |
| Jun 9, 4:16 PM CDT | Areal Flood Advisory | BMX | 119 min |
| Jun 9, 5:49 PM CDT | Areal Flood Advisory | BMX | 116 min |
| Jun 19, 10:24 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 20, 2:29 AM CDT | Severe Thunderstorm Warning | BMX | 76 min |
| Jun 20, 2:34 AM CDT | Mesoscale Discussion | SPC | 56 min |
| Jun 21, 9:02 PM CDT | Mesoscale Discussion | SPC | 118 min |
| Jun 22, 1:27 PM CDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jun 22, 2:58 PM CDT | Special Weather Statement | BMX | 47 min |
| Jun 22, 3:20 PM CDT | Severe Thunderstorm Warning | BMX | 40 min |
| Jun 22, 3:48 PM CDT | Severe Thunderstorm Warning | BMX | 57 min |
| Jun 22, 4:31 PM CDT | Special Weather Statement | BMX | 29 min |
| Jun 24, 5:32 PM CDT | Special Weather Statement | BMX | 28 min |
| Jun 25, 11:39 PM CDT | Special Weather Statement | BMX | 51 min |
| Jun 26, 12:35 AM CDT | Special Weather Statement | BMX | 40 min |
| Jun 26, 5:32 PM CDT | Special Weather Statement | BMX | 43 min |
| Jun 26, 5:42 PM CDT | Special Weather Statement | BMX | 33 min |
| Jun 26, 6:18 PM CDT | Special Weather Statement | BMX | 42 min |
| Jul 7, 12:05 PM CDT | Special Weather Statement | BMX | 40 min |
| Jul 7, 12:18 PM CDT | Special Weather Statement | BMX | 42 min |
| Jul 7, 12:38 PM CDT | Special Weather Statement | BMX | 52 min |
| Jul 7, 12:48 PM CDT | Mesoscale Discussion | SPC | 117 min |
| Jul 9, 3:04 AM CDT | Heat Advisory | BMX | 16 hr |
| Jul 9, 3:02 PM CDT | Heat Advisory | BMX | 28 hr |
| Jul 14, 3:36 PM CDT | Special Weather Statement | BMX | 24 min |
| Jul 18, 4:49 PM CDT | Areal Flood Advisory | BMX | 116 min |
| Jul 19, 11:28 AM CDT | Special Weather Statement | BMX | 47 min |
| Jul 20, 1:48 PM CDT | Special Weather Statement | BMX | 27 min |
| Jul 30, 2:41 PM CDT | Special Weather Statement | BMX | 34 min |
| Jul 30, 3:27 PM CDT | Special Weather Statement | BMX | 33 min |
| Jul 31, 12:46 PM CDT | Special Weather Statement | BMX | 29 min |
| Aug 1, 12:15 PM CDT | Special Weather Statement | BMX | 30 min |
| Aug 1, 1:12 PM CDT | Special Weather Statement | BMX | 33 min |
| Aug 3, 12:27 PM CDT | Special Weather Statement | BMX | 33 min |
| Aug 3, 1:37 PM CDT | Special Weather Statement | BMX | 23 min |
| Aug 7, 1:23 AM CDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 8, 3:53 AM CDT | Heat Advisory | BMX | 60 hr |
| Aug 10, 4:03 PM CDT | Heat Advisory | BMX | 4 days |
| Aug 10, 7:15 PM CDT | Areal Flood Advisory | BMX | 2 hr |
| Aug 12, 2:19 PM CDT | Excessive Heat Warning | BMX | 31 hr |
| Aug 13, 3:14 AM CDT | Heat Advisory | BMX | 39 hr |
| Aug 19, 4:48 AM CDT | Heat Advisory | BMX | 16 hr |
| Aug 20, 3:00 AM CDT | Heat Advisory | BMX | 18 hr |
| Aug 23, 2:54 PM CDT | Areal Flood Advisory | BMX | 2 hr |
| Aug 23, 3:12 PM CDT | Areal Flood Advisory | BMX | 2 hr |
| Aug 23, 3:15 PM CDT | Flash Flood Warning | BMX | 3 hr |
| Aug 27, 3:56 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 28, 1:44 AM CDT | Dense Fog Advisory | BMX | 6 hr |
| Sep 11, 2:08 PM CDT | Special Weather Statement | BMX | 37 min |
| Oct 3, 5:07 PM CDT | Special Weather Statement | BMX | 23 min |
| Oct 7, 8:31 AM CDT | Special Weather Statement | BMX | 44 min |
| Oct 25, 8:36 AM CDT | Areal Flood Advisory | BMX | 3 hr |
| Oct 25, 9:17 AM CDT | Areal Flood Advisory | BMX | 3 hr |
| Oct 26, 4:27 AM CDT | Wind Advisory | BMX | 14 hr |
| Oct 27, 9:53 PM CDT | Dense Fog Advisory | BMX | 13 hr |
| Oct 28, 9:42 PM CDT | Dense Fog Advisory | BMX | 11 hr |
| Oct 30, 12:12 PM CDT | Special Weather Statement | BMX | 33 min |
| Oct 30, 12:48 PM CDT | Areal Flood Advisory | BMX | 3 hr |
| Oct 30, 3:03 PM CDT | Freeze Watch | BMX | 12 hr |
| Oct 31, 3:03 AM CDT | Freeze Warning | BMX | 30 hr |
| Oct 31, 7:23 AM CDT | Special Weather Statement | BMX | 52 min |
| Nov 1, 3:59 AM CDT | Freeze Warning | BMX | 29 hr |
| Nov 2, 3:03 AM CDT | Freeze Watch | BMX | 10 hr |
| Nov 2, 1:22 PM CDT | Frost Advisory | BMX | 20 hr |
| Nov 7, 3:05 PM CST | Freeze Watch | BMX | 12 hr |
| Nov 8, 2:41 AM CST | Freeze Warning | BMX | 29 hr |
| Nov 9, 12:49 PM CST | Frost Advisory | BMX | 18 hr |
| Nov 11, 3:28 AM CST | Freeze Warning | BMX | 55 hr |
| Nov 11, 1:28 PM CST | Wind Advisory | BMX | 28 hr |
| Nov 27, 4:40 AM CST | Special Weather Statement | BMX | 35 min |
| Nov 27, 5:17 AM CST | Areal Flood Advisory | BMX | 118 min |
| Dec 7, 12:38 AM CST | Dense Fog Advisory | BMX | 5 hr |
| Dec 16, 3:47 PM CST | Tornado Watch | SPC | 10 hr |
| Dec 16, 9:47 PM CST | Tornado Watch | SPC | 6 hr |
| Dec 16, 9:59 PM CST | Tornado Warning | BMX | 31 min |
| Dec 22, 3:53 AM CST | Wind Advisory | BMX | 20 hr |
| Dec 29, 6:05 PM CST | Mesoscale Discussion | SPC | 85 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 | 4 |
| Tornado Warning | 3 |
| Severe Thunderstorm Watch | 3 |
| Tornado Watch | 8 |
| Mesoscale Discussion | 22 |
| Special Weather Statement | 39 |
| Flooding | |
| Flash Flood Warning | 1 |
| River Flood Warning | 5 |
| Flood Watch | 1 |
| Areal Flood Advisory | 18 |
| Winter | |
| Winter Storm Warning | 1 |
| Winter Storm Watch | 1 |
| Winter Weather Advisory | 1 |
| Heat | |
| Excessive Heat Warning | 1 |
| Heat Advisory | 7 |
| Cold | |
| Freeze Warning | 6 |
| Freeze Watch | 3 |
| Frost Advisory | 2 |
| Wind and dust | |
| Wind Advisory | 7 |
| Fog and smoke | |
| Dense Fog Advisory | 9 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20182020
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.