Alert archive / Alabama / Flash Flood Warnings in 2021

Flash Flood Warning 35, NWS Birmingham, AL

July 9, 2021Tuscaloosa County, Alabama

NWS Birmingham, AL issued this flash flood warning at Jul 9, 2021, 7:58 PM CDT for Tuscaloosa County, Alabama. It was in force for 118 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 9, 2021, 7:58 PM CDT (00:58 UTC)
Expired: Jul 9, 2021, 9:56 PM CDT
In force: 118 min
Issued by: NWS Birmingham, AL
Area: Storm-based polygon
Flood severity: None

County Tuscaloosa County, AL

The radar

The Birmingham radar (KBMX), 44 km from the middle of the area, began a volume at 01:01 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, 1.0 hours before the alert went out and 42 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: 2426 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 1021 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: 5 m²/s²
0-3 km storm-relative helicity: 87 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.1

Open this sounding in Storm Lab

The text

As transmitted.

921 
WGUS54 KBMX 100058
FFWBMX
ALC125-100400-
/O.NEW.KBMX.FF.W.0035.210710T0058Z-210710T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Birmingham AL
758 PM CDT Fri Jul 9 2021

The National Weather Service in Birmingham has issued a

* Flash Flood Warning for...
  Southeastern Tuscaloosa County in west central Alabama...

* Until 1100 PM CDT.

* At 758 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 3 inches of rain 
  have fallen. The expected rainfall rate is 1 to 2 inches in 1 
  hour. 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...
  Northeastern Tuscaloosa, Holt, Lake View, Brookwood, Coaling, 
  Vance, Lake Wildwood, Mercedes Benz Of Alabama, Deerlick Creek 
  Campgrounds, Abernant, Bull City, North Bibb, Tannehill Ironworks 
  State Park, East Brookwood, I 20 Rest Area Near Tuscaloosa, Cedar 
  Cove, Fleetwood, Peterson, Camp Horne B.S.A. and Holt Lock And Dam.

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 3312 8729 3320 8752 3331 8752 3344 8730
      3342 8725 3340 8725 3340 8723 3337 8723
      3336 8720 3331 8716 3330 8713 3329 8713
      3329 8709 3328 8707 3325 8707 3322 8710
      3324 8714 3320 8720 3313 8720 3313 8728

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...1-2 INCHES IN 1 HOUR

$$

40/Sizemore

2 follow-up statements

185 
WGUS74 KBMX 100141
FFSBMX

Flash Flood Statement
National Weather Service Birmingham AL
841 PM CDT Fri Jul 9 2021

ALC125-100400-
/O.CON.KBMX.FF.W.0035.000000T0000Z-210710T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Tuscaloosa AL-
841 PM CDT Fri Jul 9 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 11 PM CDT THIS 
EVENING FOR SOUTHEASTERN TUSCALOOSA COUNTY...

At 841 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 up to 1 inch 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...
  Northeastern Tuscaloosa, Holt, Lake View, Brookwood, Coaling, 
  Vance, Lake Wildwood, Mercedes Benz Of Alabama, Deerlick Creek 
  Campgrounds, Abernant, Bull City, North Bibb, Tannehill Ironworks 
  State Park, East Brookwood, I 20 Rest Area Near Tuscaloosa, Cedar 
  Cove, Fleetwood, Peterson, Camp Horne B.S.A. and Holt Lock And Dam.

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 3312 8729 3320 8752 3331 8752 3344 8730
      3342 8725 3340 8725 3340 8723 3337 8723
      3336 8720 3331 8716 3330 8713 3329 8713
      3329 8709 3328 8707 3325 8707 3322 8710
      3324 8714 3320 8720 3313 8720 3313 8728

FLASH FLOOD...RADAR INDICATED

$$

40/Sizemore

368 
WGUS74 KBMX 100256
FFSBMX

Flash Flood Statement
National Weather Service Birmingham AL
956 PM CDT Fri Jul 9 2021

ALC125-100306-
/O.CAN.KBMX.FF.W.0035.000000T0000Z-210710T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Tuscaloosa AL-
956 PM CDT Fri Jul 9 2021

...FLASH FLOOD WARNING IS CANCELLED FOR SOUTHEASTERN TUSCALOOSA 
COUNTY...

The heavy rain has ended. Flooding is no longer expected to pose an 
immediate threat. Please continue to heed remaining road closures.

LAT...LON 3312 8729 3320 8752 3331 8752 3344 8730
      3342 8725 3340 8725 3340 8723 3337 8723
      3336 8720 3331 8716 3330 8713 3329 8713
      3329 8709 3328 8707 3325 8707 3322 8710
      3324 8714 3320 8720 3313 8720 3313 8728

$$

40/Sizemore

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 9, 7:16 PM CDT	Special Weather Statement	BMX	Coosa, Shelby	44 min
Jul 9, 7:41 PM CDT	Severe Thunderstorm Warning	BMX	Jefferson	21 min
Jul 9, 7:55 PM CDT	Special Weather Statement	BMX	Tallapoosa	50 min
Jul 9, 8:02 PM CDT	Areal Flood Advisory	BMX	Jefferson, Shelby	114 min

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.