Alert archive / Alabama / Flash Flood Warnings in 2021

Flash Flood Warning 16, NWS Birmingham, AL

May 4, 2021Blount County, Etowah County, St. Clair County, Alabama

NWS Birmingham, AL issued this flash flood warning at May 4, 2021, 12:03 PM CDT for Blount County, Etowah County, St. Clair County, Alabama. It was in force for 117 min. 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: May 4, 2021, 12:03 PM CDT (17:03 UTC)
Expired: May 4, 2021, 2:00 PM CDT
In force: 117 min
Issued by: NWS Birmingham, AL
Area: Storm-based polygon
Flood severity: None

Counties Blount County, AL, Etowah County, AL, St. Clair County, AL

The radar

The Northeast Alabama radar (KHTX), 103 km from the middle of the area, began a volume at 17:07 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
May 4, 1:39 PM CDT	FLASH FLOOD	1 Wsw Big Wills Creek, AL	FLASH FLOODING IN THE CLUBVIEW SUBDIVISION OFF RAINBOW DRIVE. RELAYED VIA SOCIAL MEDIA.

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, 5.1 hours before the alert went out and 107 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: 2158 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 569 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 145 m²/s²
0-3 km storm-relative helicity: 195 m²/s²
Significant tornado parameter: 1.4
Supercell composite: 7.3

Open this sounding in Storm Lab

The text

As transmitted.

310 
WGUS54 KBMX 041703
FFWBMX
ALC009-055-115-041900-
/O.NEW.KBMX.FF.W.0016.210504T1703Z-210504T1900Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Birmingham AL
1203 PM CDT Tue May 4 2021

The National Weather Service in Birmingham has issued a

* Flash Flood Warning for...
  Southeastern Blount County in central Alabama...
  Northern St. Clair County in central Alabama...
  Etowah County in northeastern Alabama...

* Until 200 PM CDT.

* At 1203 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...Doppler radar.

  IMPACT...Flooding of small creeks and streams, urban areas,
           highways, streets and underpasses as well as other
           drainage and low lying areas.

* Some locations that will experience flash flooding include...
  Gadsden, Rainbow City, Oneonta, Attalla, Hokes Bluff, Springville, 
  Blountsville, Cleveland, Dallas, Glencoe, Ashville, Sardis City, 
  Locust Fork, Steele, Altoona, Snead, Susan Moore, Walnut Grove, 
  Reece City and Allgood.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3384 8675 3390 8671 3409 8656 3413 8634
      3410 8630 3415 8622 3420 8604 3419 8587
      3415 8584 3411 8584 3411 8583 3406 8577
      3395 8576 3395 8587 3390 8598 3389 8615
      3382 8639 3379 8659

FLASH FLOOD...RADAR INDICATED

$$

88

The office that day

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

Issued	Product	Office	Counties	Lasted
May 3, 7:02 PM CDT	Severe Thunderstorm Warning	BMX	Elmore, Montgomery	43 min
May 3, 7:13 PM CDT	Severe Thunderstorm Warning	BMX	Bibb, Chilton, Perry	32 min
May 3, 7:25 PM CDT	Flash Flood Warning	BMX	Autauga, Elmore, Macon, Montgomery	5 hr
May 3, 7:29 PM CDT	Areal Flood Advisory	BMX	Chambers, Lee, Macon, Tallapoosa	2 hr
May 3, 7:40 PM CDT	Severe Thunderstorm Warning	BMX	Elmore, Macon, Montgomery	47 min
May 3, 7:46 PM CDT	Special Weather Statement	BMX	Chilton	44 min
May 3, 8:30 PM CDT	Special Weather Statement	BMX	Lee, Macon	45 min
May 3, 8:36 PM CDT	Special Weather Statement	BMX	Chilton	39 min
May 3, 8:51 PM CDT	Areal Flood Advisory	BMX	Bibb, Chilton, Perry	3 hr
May 3, 8:59 PM CDT	Special Weather Statement	BMX	Russell	46 min
May 3, 9:31 PM CDT	Special Weather Statement	BMX	Shelby	59 min
May 4, 7:27 AM CDT	Special Weather Statement	BMX	Marion	48 min
May 4, 7:57 AM CDT	Special Weather Statement	BMX	Lamar, Marion	48 min
May 4, 9:07 AM CDT	Severe Thunderstorm Warning	BMX	Winston	38 min
May 4, 10:26 AM CDT	Severe Thunderstorm Warning	BMX	Blount	23 min
May 4, 10:59 AM CDT	Special Weather Statement	BMX	Walker	31 min
May 4, 11:00 AM CDT	Areal Flood Advisory	BMX	Fayette, Lamar, Walker	3 hr
May 4, 11:06 AM CDT	Areal Flood Advisory	BMX	Blount, Calhoun, Cherokee, Etowah, St. Clair	3 hr
May 4, 11:12 AM CDT	Tornado Warning	BMX	Fayette, Tuscaloosa	21 min
May 4, 11:25 AM CDT	Severe Thunderstorm Warning	BMX	Jefferson, Walker	50 min
May 4, 11:45 AM CDT	Areal Flood Advisory	BMX	Jefferson	2 hr
May 4, 11:49 AM CDT	Severe Thunderstorm Warning	BMX	Blount, Jefferson, St. Clair	26 min
May 4, 12:10 PM CDT	Flash Flood Warning	BMX	Jefferson	7 hr
May 4, 12:14 PM CDT	Severe Thunderstorm Warning	BMX	Calhoun, St. Clair, Talladega	46 min
May 4, 12:17 PM CDT	Severe Thunderstorm Warning	BMX	Jefferson, St. Clair, Shelby	28 min
May 4, 12:35 PM CDT	Flash Flood Warning	BMX	Calhoun, Etowah, St. Clair, Talladega	3 hr
May 4, 12:56 PM CDT	Severe Thunderstorm Warning	BMX	Calhoun, Cherokee, Cleburne, Talladega	64 min
May 4, 1:15 PM CDT	Severe Thunderstorm Warning	BMX	Jefferson, Shelby	30 min
May 4, 1:25 PM CDT	Tornado Warning	BMX	Cleburne	24 min
May 4, 1:39 PM CDT	Flash Flood Warning	BMX	Jefferson, St. Clair, Shelby	5 hr
May 4, 2:07 PM CDT	Areal Flood Warning	BMX	Blount, Calhoun, Cherokee, Etowah, St. Clair	6 hr
May 4, 2:54 PM CDT	Areal Flood Advisory	BMX	Clay, Cleburne, Randolph, Shelby, Talladega	3 hr
May 4, 3:50 PM CDT	Severe Thunderstorm Warning	BMX	Sumter	55 min
May 4, 4:01 PM CDT	Flash Flood Warning	BMX	Shelby, Talladega	3 hr
May 4, 4:05 PM CDT	Flash Flood Warning	BMX	Bibb, Tuscaloosa	3 hr
May 4, 4:13 PM CDT	Severe Thunderstorm Warning	BMX	Tuscaloosa	29 min
May 4, 4:20 PM CDT	Severe Thunderstorm Warning	BMX	Greene	55 min
May 4, 4:30 PM CDT	Severe Thunderstorm Warning	BMX	Hale, Marengo	63 min
May 4, 4:45 PM CDT	Special Weather Statement	BMX	Walker, Winston	30 min
May 4, 5:00 PM CDT	Severe Thunderstorm Warning	BMX	Bibb, Chilton, Dallas, Perry	75 min
May 4, 5:17 PM CDT	Flash Flood Warning EmergencyCatastrophic damage threat	BMX	Jefferson, Shelby	3 hr
May 4, 5:29 PM CDT	Severe Thunderstorm Warning	BMX	Autauga, Chilton, Lowndes	76 min
May 4, 5:30 PM CDT	Tornado Warning	BMX	Chilton, Perry	30 min
May 4, 5:38 PM CDT	Tornado Warning	BMX	Shelby	12 min
May 4, 5:54 PM CDT	Severe Thunderstorm Warning	BMX	Coosa	50 min
May 4, 5:59 PM CDT	Severe Thunderstorm Warning	BMX	Elmore	61 min
May 4, 6:07 PM CDT	Severe Thunderstorm Warning	BMX	Montgomery	68 min
May 4, 6:19 PM CDT	Severe Thunderstorm Warning	BMX	Tallapoosa	56 min
May 4, 6:24 PM CDT	Tornado Warning	BMX	Elmore, Montgomery	13 min
May 4, 6:37 PM CDT	Severe Thunderstorm Warning	BMX	Bullock, Macon, Pike	83 min
May 4, 6:41 PM CDT	Severe Thunderstorm Warning	BMX	Chambers, Lee	61 min
May 4, 6:48 PM CDT	River Flood Warning	BMX	Bibb, Jefferson, Shelby	22 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.