Alert archive / Alabama / Flash Flood Warnings in 2021

Flash Flood Warning 28, NWS Birmingham, AL

June 11, 2021Tuscaloosa County, Alabama

NWS Birmingham, AL issued this flash flood warning at Jun 11, 2021, 12:47 PM CDT for Tuscaloosa County, Alabama. It was in force for 3 hr. 1 report 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: Jun 11, 2021, 12:47 PM CDT (17:47 UTC)
Expired: Jun 11, 2021, 4:00 PM CDT
In force: 3 hr
Issued by: NWS Birmingham, AL
Area: Storm-based polygon
Flood severity: None

County Tuscaloosa County, AL

The radar

The Birmingham radar (KBMX), 63 km from the middle of the area, began a volume at 17:45 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.

What was reported inside it

Time	Report	Where	Remark
Jun 11, 12:52 PM CDT	FLASH FLOOD	3 Ne Lake Lurleen State, AL	FLOWING WATER OVER HOMEPLACE ROAD IN TWO SPOTS.

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, 5.8 hours before the alert went out and 62 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: 576 J/kg
Mixed-layer CIN: -25 J/kg
Mixed-layer LCL: 651 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 90 m²/s²
0-3 km storm-relative helicity: 110 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

875 
WGUS54 KBMX 111747
FFWBMX
ALC125-112100-
/O.NEW.KBMX.FF.W.0028.210611T1747Z-210611T2100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Birmingham AL
1247 PM CDT Fri Jun 11 2021

The National Weather Service in Birmingham has issued a

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

* Until 400 PM CDT.

* At 1247 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across 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...
  Tuscaloosa, Northport, Holt, Moundville, Brookwood, Coaling, 
  Vance, Coker, Bryant Denny Stadium, Tuscaloosa Amphitheater, 
  University Mall, Tuscaloosa Regional Airport, McFarland Mall, 
  Deerlick Creek Campgrounds, Lake Lurleen State Park, Binion Creek 
  Landing, Shelton State Community College, Samantha, Lake Wildwood 
  and Bankhead Lock And Dam.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3358 8763 3352 8752 3341 8725 3340 8725
      3340 8723 3337 8723 3336 8720 3334 8720
      3334 8718 3332 8718 3332 8716 3313 8721
      3314 8730 3301 8732 3301 8771 3302 8771
      3303 8783 3352 8784 3351 8767 3358 8767

FLASH FLOOD...RADAR INDICATED

$$

08

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 11, 9:46 AM CDT	Areal Flood Advisory	BMX	Tuscaloosa	3 hr
Jun 11, 10:47 AM CDT	Flash Flood Warning	BMX	Tuscaloosa	118 min
Jun 11, 12:10 PM CDT	Special Weather Statement	BMX	Pickens	65 min
Jun 11, 12:18 PM CDT	Special Weather Statement	BMX	Tuscaloosa	42 min
Jun 11, 12:52 PM CDT	Areal Flood Advisory	BMX	Pickens	3 hr
Jun 11, 1:37 PM CDT	Flash Flood Warning	BMX	Pickens	2 hr
Jun 11, 2:14 PM CDT	Special Weather Statement	BMX	Greene	31 min
Jun 11, 2:25 PM CDT	Areal Flood Advisory	BMX	Greene, Hale, Pickens	4 hr
Jun 11, 2:45 PM CDT	Special Weather Statement	BMX	Macon	45 min
Jun 11, 3:17 PM CDT	Special Weather Statement	BMX	Tallapoosa	28 min
Jun 11, 3:32 PM CDT	Areal Flood Advisory	BMX	Lamar	3 hr
Jun 11, 3:36 PM CDT	Special Weather Statement	BMX	Marion	39 min
Jun 11, 3:45 PM CDT	Special Weather Statement	BMX	Marion	30 min
Jun 11, 3:49 PM CDT	Special Weather Statement	BMX	Russell	26 min
Jun 11, 4:45 PM CDT	Special Weather Statement	BMX	Winston	45 min
Jun 11, 5:16 PM CDT	Special Weather Statement	BMX	Marion	44 min
Jun 11, 5:17 PM CDT	Special Weather Statement	BMX	Lamar	28 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.