Alert archive / Alabama / Flash Flood Warnings in 2021

Flash Flood Warning 61, NWS Birmingham, AL

October 5, 2021Blount County, Walker County, Alabama

NWS Birmingham, AL issued this flash flood warning at Oct 5, 2021, 8:43 PM CDT for Blount County, Walker County, Alabama. It was in force for 6 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: Oct 5, 2021, 8:43 PM CDT (01:43 UTC)
Expired: Oct 6, 2021, 2:45 AM CDT
In force: 6 hr
Issued by: NWS Birmingham, AL
Area: Storm-based polygon
Flood severity: None

Counties Blount County, AL, Walker County, AL

The radar

The Birmingham radar (KBMX), 76 km from the middle of the area, began a volume at 01:45 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 00:00Z, 1.7 hours before the alert went out and 75 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: 734 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 449 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 90 m²/s²
0-3 km storm-relative helicity: 188 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

599 
WGUS54 KBMX 060143
FFWBMX
ALC009-127-060745-
/O.NEW.KBMX.FF.W.0061.211006T0143Z-211006T0745Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Birmingham AL
843 PM CDT Tue Oct 5 2021

The National Weather Service in Birmingham has issued a

* Flash Flood Warning for...
  Southwestern Blount County in central Alabama...
  East Central Walker County in central Alabama...

* Until 245 AM CDT Wednesday.

* At 843 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 2 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...
  Sumiton, Dora, Arkadelphia, Empire, Rickwood Caverns and Smoke 
  Rise.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

&&

LAT...LON 3379 8701 3377 8701 3377 8702 3375 8702
      3373 8704 3374 8707 3389 8704 3389 8701
      3387 8701 3386 8699 3386 8695 3387 8695
      3387 8692 3391 8692 3392 8689 3394 8688
      3384 8682 3384 8688 3382 8695 3379 8697

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
Oct 5, 7:02 PM CDT	Flash Flood Warning	BMX	Jefferson	6 hr
Oct 5, 8:00 PM CDT	Special Weather Statement	BMX	Lamar, Pickens	45 min
Oct 5, 8:19 PM CDT	Areal Flood Advisory	BMX	Blount, Walker	6 hr
Oct 5, 8:45 PM CDT	Special Weather Statement	BMX	Lamar, Pickens	45 min
Oct 5, 9:19 PM CDT	Areal Flood Advisory	BMX	Lamar	4 hr
Oct 5, 10:29 PM CDT	Special Weather Statement	BMX	Marion	31 min
Oct 5, 10:42 PM CDT	Areal Flood Advisory	BMX	Fayette, Marion	3 hr
Oct 6, 2:24 AM CDT	Areal Flood Advisory	BMX	Winston	3 hr
Oct 6, 4:35 PM CDT	Special Weather Statement	BMX	Walker	25 min
Oct 6, 6:16 PM CDT	Areal Flood Advisory	BMX	Blount	3 hr
Oct 6, 6:43 PM CDT	Areal Flood Advisory	BMX	Jefferson	3 hr
Oct 6, 6:57 PM CDT	Flash Flood Warning	BMX	Blount	2 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.