Alert archive / Alabama / Flash Flood Warnings in 2021

Flash Flood Warning 46, NWS Birmingham, AL

August 19, 2021Fayette County, Tuscaloosa County, Alabama

NWS Birmingham, AL issued this flash flood warning at Aug 19, 2021, 1:32 PM CDT for Fayette County, Tuscaloosa County, Alabama. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 19, 2021, 1:32 PM CDT (18:32 UTC)
Expired: Aug 19, 2021, 4:45 PM CDT
In force: 3 hr
Issued by: NWS Birmingham, AL
Area: Storm-based polygon
Flood severity: None

Counties Fayette County, AL, Tuscaloosa County, AL

The radar

The Columbus AFB radar (KGWX), 67 km from the middle of the area, began a volume at 18:34 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, 6.5 hours before the alert went out and 98 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 2206 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 517 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 29 m²/s²
0-3 km storm-relative helicity: 54 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

406 
WGUS54 KBMX 191832
FFWBMX
ALC057-125-192145-
/O.NEW.KBMX.FF.W.0046.210819T1832Z-210819T2145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Birmingham AL
132 PM CDT Thu Aug 19 2021

The National Weather Service in Birmingham has issued a

* Flash Flood Warning for...
  Southern Fayette County in west central Alabama...
  Northwestern Tuscaloosa County in west central Alabama...

* Until 445 PM CDT.

* At 132 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 2 and 4 inches of rain 
  have fallen. Additional rainfall amounts of 1 to 2 inches are 
  possible in the warned area. Flash flooding is ongoing or expected 
  to begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar.

  IMPACT...Flash flooding of small creeks and streams, urban
           areas, highways, streets and underpasses as well as
           other poor drainage and low-lying areas.

* Some locations that will experience flash flooding include...
  Berry, Bankston, Boley Springs, Ashcraft Corner, New Lexington, 
  Fayette County Public Lake and Stone Wall.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

&&

LAT...LON 3353 8794 3359 8779 3367 8775 3372 8763
      3369 8753 3365 8747 3360 8747 3354 8755
      3346 8760 3346 8783 3347 8784 3352 8784
      3352 8793

FLASH FLOOD...RADAR INDICATED

$$

32/Davis

The office that day

Everything else NWS Birmingham, AL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 18, 7:44 PM CDT	Special Weather Statement	BMX	Blount	31 min
Aug 18, 8:55 PM CDT	Areal Flood Advisory	BMX	Marion	2 hr
Aug 19, 11:21 AM CDT	Areal Flood Advisory	BMX	Blount	3 hr
Aug 19, 11:35 AM CDT	Areal Flood Advisory	BMX	Jefferson	3 hr
Aug 19, 11:59 AM CDT	Areal Flood Advisory	BMX	Fayette	2 hr
Aug 19, 12:20 PM CDT	Areal Flood Advisory	BMX	Jefferson, St. Clair, Shelby	115 min
Aug 19, 12:28 PM CDT	Areal Flood Advisory	BMX	Calhoun, Etowah, St. Clair	2 hr
Aug 19, 12:48 PM CDT	Areal Flood Advisory	BMX	Calhoun, Cleburne	117 min
Aug 19, 12:54 PM CDT	Areal Flood Advisory	BMX	Fayette, Tuscaloosa	3 hr
Aug 19, 1:19 PM CDT	Flash Flood Warning	BMX	Calhoun, Cleburne	3 hr
Aug 19, 1:35 PM CDT	Areal Flood Advisory	BMX	Pickens	3 hr
Aug 19, 1:56 PM CDT	Areal Flood Advisory	BMX	Clay	3 hr
Aug 19, 2:23 PM CDT	Areal Flood Advisory	BMX	Bibb, Tuscaloosa	2 hr
Aug 19, 2:54 PM CDT	Areal Flood Advisory	BMX	Pickens	3 hr
Aug 19, 3:27 PM CDT	Areal Flood Advisory	BMX	Lamar	2 hr
Aug 19, 3:30 PM CDT	Special Weather Statement	BMX	Autauga	30 min
Aug 19, 3:33 PM CDT	Areal Flood Advisory	BMX	Sumter	3 hr
Aug 19, 3:40 PM CDT	Areal Flood Advisory	BMX	Autauga, Dallas, Perry	2 hr
Aug 19, 4:46 PM CDT	Areal Flood Advisory	BMX	Marengo, Sumter	3 hr
Aug 19, 5:03 PM CDT	Special Weather Statement	BMX	Marengo	27 min
Aug 19, 5:10 PM CDT	Areal Flood Advisory	BMX	Autauga, Elmore, Montgomery	3 hr
Aug 19, 5:38 PM CDT	Areal Flood Advisory	BMX	Marion	3 hr

Nearby

Flash Flood Warnings in Alabama, 2021 Every flash flood warning in 2021

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.