Alert archive / Alabama / Flash Flood Warnings in 2021

Flash Flood Warning 62, NWS Birmingham, AL

October 6, 2021Blount County, Alabama

NWS Birmingham, AL issued this flash flood warning at Oct 6, 2021, 6:57 PM CDT for Blount County, Alabama. It was in force for 2 hr. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Oct 6, 2021, 6:57 PM CDT (23:57 UTC)
Expired: Oct 6, 2021, 9:15 PM CDT
In force: 2 hr
Issued by: NWS Birmingham, AL
Area: Storm-based polygon
Flood severity: None

County Blount County, AL

The radar

The Northeast Alabama radar (KHTX), 95 km from the middle of the area, began a volume at 23:58 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.

What was reported inside it

Time	Report	Where	Remark
Oct 6, 7:42 PM CDT	FLASH FLOOD	2 Nw Brooksville, AL	COUNTY ROAD 48 IN SUMMIT IS FLOODED AN IMPASSABLE. A VEHICLE IS STRANDED IN THE FLOOD WATERS.
Oct 6, 8:10 PM CDT	FLASH FLOOD	Blountsville, AL	HIGHWAY 231 HAS WATER COVERING THE ROADWAY AND WAS TEMPORARILY IMPASSABLE IN BLOUNTSVILLE. WATER OVER A FOOT DEEP.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 12.0 hours before the alert went out and 111 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: 683 J/kg
Mixed-layer CIN: -31 J/kg
Mixed-layer LCL: 559 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 111 m²/s²
0-3 km storm-relative helicity: 119 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.8

Open this sounding in Storm Lab

The text

As transmitted.

553 
WGUS54 KBMX 062357
FFWBMX
ALC009-070215-
/O.NEW.KBMX.FF.W.0062.211006T2357Z-211007T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Birmingham AL
657 PM CDT Wed Oct 6 2021

The National Weather Service in Birmingham has issued a

* Flash Flood Warning for...
  Northeastern Blount County in central Alabama...

* Until 915 PM CDT.

* At 657 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 2 and 5 inches of rain 
  have fallen. Additional rainfall amounts of 1 to 3 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...
  Blountsville, Cleveland, Brooksville, Strawberry and Fowler Spring.

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.

Be aware of your surroundings and do not drive on flooded roads.

&&

LAT...LON 3402 8653 3401 8666 3411 8664 3412 8663
      3411 8661 3412 8660 3414 8659 3415 8659
      3418 8655 3419 8655 3421 8654 3422 8655
      3423 8652 3425 8651 3425 8650 3426 8649
      3426 8644 3425 8644 3420 8641 3410 8646

FLASH FLOOD...RADAR INDICATED

$$

17/KLAWS

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, 8:43 PM CDT	Flash Flood Warning	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

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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.