Alert archive / Alabama / Flash Flood Watches in 2020
Flash Flood Watch 12, NWS Birmingham, AL
NWS Birmingham, AL issued this flash flood watch at Aug 28, 2020, 11:10 AM CDT for 19 counties in Alabama. It was in force for 7 hr.
The area
The counties it named.
The facts
- Issued
- Aug 28, 2020, 11:10 AM CDT (16:10 UTC)
- Expired
- Aug 28, 2020, 5:47 PM CDT
- In force
- 7 hr
- Issued by
- NWS Birmingham, AL
- Flood severity
- None
Counties Bibb County, AL, Blount County, AL, Calhoun County, AL, Cherokee County, AL, Chilton County, AL, Clay County, AL, Cleburne County, AL, Coosa County, AL, Etowah County, AL, Greene County, AL, Hale County, AL, Jefferson County, AL, Marengo County, AL, Perry County, AL, Shelby County, AL, St. Clair County, AL, Sumter County, AL, Talladega County, AL, Tuscaloosa County, AL
The radar
The Birmingham radar (KBMX), 11 km from the middle of the area, began a volume at 16:13 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Birmingham, AL (KBMX), launched 12:00Z, 4.2 hours before the alert went out and 10 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 981 J/kg
- Mixed-layer CIN
- -6 J/kg
- Mixed-layer LCL
- 576 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 78 m²/s²
- 0-3 km storm-relative helicity
- 71 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.3
What forecasters said that day
The local office's own words before this flash flood watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Birmingham, AL wrote its last area forecast discussion before this flash flood watch went out at Aug 28, 10:38 AM CDT, 32 minutes earlier.
Area forecast discussion, Aug 28, 10:38 AM CDT, 32 minutes before
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</html>Hazardous weather outlook, Aug 28, 4:56 AM CDT, 6 hours 14 minutes before
Hazardous Weather Outlook National Weather Service Birmingham AL 456 AM CDT Fri Aug 28 2020 ALZ011>015-017>050-291300- Marion-Lamar-Fayette-Winston-Walker-Blount-Etowah-Calhoun-Cherokee- Cleburne-Pickens-Tuscaloosa-Jefferson-Shelby-St. Clair-Talladega- Clay-Randolph-Sumter-Greene-Hale-Perry-Bibb-Chilton-Coosa-Tallapoosa- Chambers-Marengo-Dallas-Autauga-Lowndes-Elmore-Montgomery-Macon- Bullock-Lee-Russell-Pike-Barbour- 456 AM CDT Fri Aug 28 2020 This Hazardous Weather Outlook is for the counties served by the National Weather Service office in Birmingham. .DAY ONE...Outlook through Tonight. The remnants of Laura may bring a threat for damaging winds and a brief tornado between Noon and 10 PM. Areas with greatest potential will be along and northwest of an Aliceville to Warrior line, with a marginal risk along and north of a Livingston to Anniston line. .DAYS TWO THROUGH SEVEN...Saturday through Thursday. No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Activation of storm spotters and emergency management may be needed on through tonight. Please follow all local, state, and CDC guidelines in regards to travel.
The office that day
Everything else NWS Birmingham, AL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 28, 7:24 AM CDT | Areal Flood Advisory | BMX | Greene, Hale, Sumter | 5 hr |
| Aug 28, 8:13 AM CDT | Areal Flood Advisory | BMX | Bibb, Greene, Hale, Tuscaloosa | 3 hr |
| Aug 28, 10:21 AM CDT | Flash Flood Watch | BMX | Bibb, Blount, Calhoun, Cherokee, Chilton, Clay and 13 more | 49 min |
| Aug 28, 12:37 PM CDT | Special Weather Statement | BMX | Talladega | 53 min |
| Aug 28, 12:39 PM CDT | Special Weather Statement | BMX | Marengo | 51 min |
| Aug 28, 1:15 PM CDT | Special Weather Statement | BMX | Clay, Talladega | 45 min |
| Aug 28, 2:28 PM CDT | Special Weather Statement | BMX | Marion | 47 min |
| Aug 28, 3:26 PM CDT | Special Weather Statement | BMX | Winston | 49 min |
| Aug 28, 3:36 PM CDT | Severe Thunderstorm Warning | BMX | Marion | 39 min |
| Aug 28, 4:09 PM CDT | Special Weather Statement | BMX | Elmore | 36 min |
| Aug 28, 4:15 PM CDT | Special Weather Statement | BMX | Marion, Winston | 45 min |
| Aug 28, 4:32 PM CDT | Severe Thunderstorm Warning | BMX | Fayette, Lamar, Marion | 43 min |
| Aug 28, 4:36 PM CDT | Tornado Warning | BMX | Winston | 39 min |
| Aug 28, 5:10 PM CDT | Areal Flood Advisory | BMX | Lamar, Marion, Winston | 2 hr |
| Aug 28, 5:14 PM CDT | Special Weather Statement | BMX | Lee | 46 min |
| Aug 28, 5:15 PM CDT | Severe Thunderstorm Warning | BMX | Winston | 15 min |
| Aug 28, 5:16 PM CDT | Special Weather Statement | BMX | Fayette, Lamar, Winston | 44 min |
| Aug 28, 5:21 PM CDT | Severe Thunderstorm Warning | BMX | Marion, Walker, Winston | 54 min |
| Aug 28, 5:27 PM CDT | Severe Thunderstorm Warning | BMX | Fayette, Lamar, Walker | 43 min |
Nearby
Flash Flood Watches in Alabama, 2020Every flash flood watch in 2020
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.