Alert archive / Alabama / Flash Flood Watches in 2020
Flash Flood Watch 4, NWS Birmingham, AL
NWS Birmingham, AL issued this flash flood watch at Feb 11, 2020, 3:43 PM CST for 25 counties in Alabama. It took effect at Feb 12, 2020, 4:00 PM CST. It was in force for 14 hr.
The area
The counties it named.
The facts
- Issued
- Feb 11, 2020, 3:43 PM CST (21:43 UTC)
- In effect from
- Feb 12, 2020, 4:00 PM CST
- Expired
- Feb 13, 2020, 6:00 AM CST
- In force
- 14 hr
- Issued by
- NWS Birmingham, AL
- Flood severity
- None
All 25 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, Fayette County, AL, Greene County, AL, Hale County, AL, Jefferson County, AL, Lamar County, AL, Marion County, AL, Perry County, AL, Pickens County, AL, Randolph County, AL, Shelby County, AL, St. Clair County, AL, Sumter County, AL, Talladega County, AL, Tuscaloosa County, AL, Walker County, AL, Winston County, AL
The radar
The Birmingham radar (KBMX), 31 km from the middle of the area, began a volume at 21:47 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, 9.7 hours before the alert went out and 30 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
- 169 J/kg
- Mixed-layer CIN
- -6 J/kg
- Mixed-layer LCL
- 586 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 248 m²/s²
- 0-3 km storm-relative helicity
- 332 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 1.1
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 Feb 11, 12:22 PM CST, 3 hours 21 minutes earlier.
Area forecast discussion, Feb 11, 12:22 PM CST, 3 hours 21 minutes before
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Hazardous Weather Outlook National Weather Service Birmingham AL 300 AM CST Tue Feb 11 2020 ALZ011>015-017>050-121200- 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- 300 AM CST Tue Feb 11 2020 This Hazardous Weather Outlook is for the counties served by the National Weather Service office in Birmingham. .DAY ONE...Outlook through Tonight. Periods of heavy rainfall are expected through tonight. Recent rainfall has produced saturated soil conditions, and any additional rainfall could produce flash flooding issues. Many area rivers are in or expected to rise above flood stage. Please see the latest river statements for specific details on the rises and expected crest values. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. There is a potential for severe storms Wednesday night into early Thursday morning. Damaging winds and a couple of tornadoes appear possible. Periods of heavy rainfall are expected Wednesday night through Thursday. Recent heavy rainfall has produced saturated soil conditions, and any additional rainfall could produce flash flooding issues. Many rivers will continue to rise over the next few days. Many have reached flood stage or will reach flood stage. Please see the latest river statements for specific details on the rises and expected crest values. .SPOTTER INFORMATION STATEMENT... Activation of storm spotters and emergency management may be necessary Wednesday night.
In the hours before
Local storm report, Feb 11, 1:09 PM CST, 2 hours 34 minutes before
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</html>The office that day
Everything else NWS Birmingham, AL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 10, 6:13 PM CST | Areal Flood Warning | BMX | Bibb, Greene, Jefferson, Pickens, Shelby, Sumter and 1 more | 6 hr |
| Feb 10, 8:25 PM CST | Areal Flood Warning | BMX | Calhoun, Clay, Cleburne, Coosa, Randolph, St. Clair and 1 more | 6 hr |
| Feb 10, 8:29 PM CST | Areal Flood Warning | BMX | Bibb, Chilton, Hale, Perry | 6 hr |
| Feb 10, 11:13 PM CST | Areal Flood Advisory | BMX | Fayette, Lamar, Marion, Walker, Winston | 6 hr |
| Feb 11, 12:03 AM CST | Areal Flood Advisory | BMX | Blount, Cherokee, Etowah | 6 hr |
| Feb 11, 12:19 AM CST | Areal Flood Warning | BMX | Bibb, Greene, Jefferson, Pickens, Shelby, Sumter and 1 more | 6 hr |
| Feb 11, 12:26 AM CST | Areal Flood Warning | BMX | Fayette, Lamar, Marion, Walker, Winston | 6 hr |
| Feb 11, 2:38 AM CST | Areal Flood Advisory | BMX | Calhoun, Chilton, Clay, Cleburne, Coosa, Randolph and 2 more | 4 hr |
| Feb 11, 3:03 AM CST | River Flood Warning | BMX | Dallas | 6 days |
| Feb 11, 6:13 AM CST | Flash Flood Warning | BMX | Tuscaloosa | 3 hr |
| Feb 11, 7:37 AM CST | Areal Flood Advisory | BMX | Bibb, Shelby, Talladega | 3 hr |
| Feb 11, 8:35 AM CST | River Flood Warning | BMX | Autauga, Dallas, Lowndes | 4 days |
| Feb 11, 1:58 PM CST | Special Weather Statement | BMX | Elmore | 47 min |
| Feb 11, 2:39 PM CST | River Flood Warning | BMX | Chambers, Elmore, Macon, Randolph, Tallapoosa | 29 hr |
| Feb 11, 2:46 PM CST | Special Weather Statement | BMX | Lee | 44 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.