Alert archive / Alabama / Flash Flood Warnings in 2021

Flash Flood Warning 22, NWS Birmingham, AL

May 4, 2021Jefferson County, Shelby County, Alabama

NWS Birmingham, AL issued this flash flood warning at May 4, 2021, 5:17 PM CDT for Jefferson County, Shelby County, Alabama. It was in force for 3 hr. 9 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
May 4, 2021, 5:17 PM CDT (22:17 UTC)
Expired
May 4, 2021, 8:15 PM CDT
In force
3 hr
Issued by
NWS Birmingham, AL
Area
Storm-based polygon
Emergency
Flash flood emergency
Damage threat
Catastrophic
Flood severity
None

Counties Jefferson County, AL, Shelby County, AL

The radar

The Birmingham radar (KBMX), 34 km from the middle of the area, began a volume at 22:15 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

TimeReportWhereRemark
May 4, 5:25 PM CDTFLASH FLOODRiverchase Galleria, ALALL LANES OF HIGHWAY 31 AT HIGHWAY 150 ARE CLOSED DUE TO FLASH FLOODING.
May 4, 5:28 PM CDTFLASH FLOODJoe Tucker Park, ALFLOODING NEAR COUNTY ROADS 52 AND 95 IN HELENA.
May 4, 5:30 PM CDTFLASH FLOOD1 Ssw Homewood, ALRESIDENTS BEING EVACUATED OUT OF THE RUE MAISON APARTMENTS DUE TO FLASH FLOODING.
May 4, 5:33 PM CDTFLASH FLOOD1 S Riverchase, ALFIRE DEPARTMENT REPORTING HOMES FLOODED ON NORRIDGE PLACE.
May 4, 5:50 PM CDTFLASH FLOOD1 N Hoover, ALPATTON CREEK OVERTOPPING THE BRIDGE AT SOUTHLAND DRIVE.
May 4, 5:54 PM CDTFLASH FLOOD2 Se Vestavia Hills, ALFLASH FLOODING IN THE 2400 BLOCK OF ACTON ROAD. LARGE ROCKS BEING WASHED INTO THE ROADWAY.
May 4, 6:00 PM CDTFLASH FLOOD2 Ese Vestavia Hills, ALHOMES FLOODED ON LESLIE ANN ROAD.
May 4, 6:45 PM CDTFLASH FLOOD1 S Lake Purdy, ALFAST MOVING AND DEEP WATER RUNNING ACROSS HIGHWAY 119 NEAR LAKE PURDY.
May 4, 7:18 PM CDTFLASH FLOODPelham, ALWATER COVERING CR 52 BETWEEN HWY 31 AND I-65.

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, 10.3 hours before the alert went out and 33 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-pSkew-T log-p diagram, Birmingham, AL at 12:00Z on 2021-05-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2158 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Birmingham, AL at 12:00Z on 2021-05-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 145 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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.

263 
WGUS54 KBMX 042217
FFWBMX
ALC073-117-050115-
/O.NEW.KBMX.FF.W.0022.210504T2217Z-210505T0115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

...FLASH FLOOD EMERGENCY FOR BIRMINGHAN METRO AREA...

The National Weather Service in Birmingham has issued a

* Flash Flood Warning for...
  Southeastern Jefferson County in central Alabama...
  Northwestern Shelby County in central Alabama...

* Until 815 PM CDT.

* At 517 PM CDT, Emergency Management reported thunderstorms 
  producing heavy rain across the warned area. Between 3 and 5 
  inches of rain have fallen. Flash flooding is already occurring.

  This is a FLASH FLOOD EMERGENCY for Birminghan Metro Area. This is 
  a PARTICULARLY DANGEROUS SITUATION. SEEK HIGHER GROUND NOW!

  HAZARD...Life threatening flash flooding. Thunderstorms
           producing flash flooding.

  SOURCE...Emergency management.

  IMPACT...This is a PARTICULARLY DANGEROUS SITUATION. SEEK
           HIGHER GROUND NOW! Life threatening flash flooding of
           low water crossings, small creeks and streams, urban
           areas, highways, streets and underpasses.

* Some locations that will experience flash flooding include...
  Birmingham, Hoover, Vestavia Hills, Bessemer, Homewood, Pelham, 
  Mountain Brook, Trussville, Helena, Hueytown, Irondale, Leeds, 
  Moody, Fairfield, Chelsea, Pleasant Grove, Tarrant, Midfield, 
  Brighton and Indian Springs Village.

This includes the following streams and drainages...
  Fivemile Creek, Nabors Branch, Dry Creek, Little Shades Creek, 
  Dolly Brook, South Prong Cox Creek, Little Cahaba Creek, Coales 
  Branch, Shoal Creek, Village Creek, Stinking Creek, Lick Creek, 
  Shephard Branch, Shades Creek, Dry Brook, Bob George Branch, 
  Prairie Brook, Clear Branch, Coal Branch, Camp Branch, Hogpen 
  Branch, Rock Creek, Black Creek, Halls Creek, Peavine Creek, 
  Cahaba River, Opossum Creek, Griffin Brook, Yellowleaf Creek, 
  Pinchgut Creek, Abeg Creek, Little Creek, Watkins Brook, Hogpen 
  Creek, Big Black Creek, Lee Branch, Patton Creek, Little Cahaba 
  River, Valley Creek and Hurricane Branch.

Additional rainfall amounts of 1 to 2 inches are possible in the 
warned area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move to higher ground now! This is an extremely dangerous and 
life-threatening situation. Do not attempt to travel unless you are 
fleeing an area subject to flooding or under an evacuation order.

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

&&

LAT...LON 3345 8701 3358 8679 3361 8655 3356 8655
      3356 8654 3354 8654 3354 8652 3354 8651
      3353 8651 3346 8663 3336 8664 3328 8680
      3328 8693 3336 8702

FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CATASTROPHIC

$$

40/Sizemore
1 follow-up statement
060 
WGUS74 KBMX 050111
FFSBMX

Flash Flood Statement
National Weather Service Birmingham AL
811 PM CDT Tue May 4 2021

ALC073-117-050121-
/O.EXP.KBMX.FF.W.0022.000000T0000Z-210505T0115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Jefferson AL-Shelby AL-
811 PM CDT Tue May 4 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 815 PM CDT THIS EVENING FOR 
SOUTHEASTERN JEFFERSON AND NORTHWESTERN SHELBY COUNTIES...

The heavy rain has ended. However, widespread flooding continues 
across the Birmingham Metro area. An Areal Flood Warning remains in 
effect until 115 AM CDT. Please continue to heed remaining road 
closures and guidance from local officials.

LAT...LON 3345 8701 3358 8679 3361 8655 3356 8655
      3356 8654 3354 8654 3354 8652 3354 8651
      3353 8651 3346 8663 3336 8664 3328 8680
      3328 8693 3336 8702

$$

40/Sizemore

The office that day

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

IssuedProductOfficeCountiesLasted
May 3, 7:02 PM CDTSevere Thunderstorm WarningBMXElmore, Montgomery43 min
May 3, 7:13 PM CDTSevere Thunderstorm WarningBMXBibb, Chilton, Perry32 min
May 3, 7:25 PM CDTFlash Flood WarningBMXAutauga, Elmore, Macon, Montgomery5 hr
May 3, 7:29 PM CDTAreal Flood AdvisoryBMXChambers, Lee, Macon, Tallapoosa2 hr
May 3, 7:40 PM CDTSevere Thunderstorm WarningBMXElmore, Macon, Montgomery47 min
May 3, 7:46 PM CDTSpecial Weather StatementBMXChilton44 min
May 3, 8:30 PM CDTSpecial Weather StatementBMXLee, Macon45 min
May 3, 8:36 PM CDTSpecial Weather StatementBMXChilton39 min
May 3, 8:51 PM CDTAreal Flood AdvisoryBMXBibb, Chilton, Perry3 hr
May 3, 8:59 PM CDTSpecial Weather StatementBMXRussell46 min
May 3, 9:31 PM CDTSpecial Weather StatementBMXShelby59 min
May 4, 7:27 AM CDTSpecial Weather StatementBMXMarion48 min
May 4, 7:57 AM CDTSpecial Weather StatementBMXLamar, Marion48 min
May 4, 9:07 AM CDTSevere Thunderstorm WarningBMXWinston38 min
May 4, 10:26 AM CDTSevere Thunderstorm WarningBMXBlount23 min
May 4, 10:59 AM CDTSpecial Weather StatementBMXWalker31 min
May 4, 11:00 AM CDTAreal Flood AdvisoryBMXFayette, Lamar, Walker3 hr
May 4, 11:06 AM CDTAreal Flood AdvisoryBMXBlount, Calhoun, Cherokee, Etowah, St. Clair3 hr
May 4, 11:12 AM CDTTornado WarningBMXFayette, Tuscaloosa21 min
May 4, 11:25 AM CDTSevere Thunderstorm WarningBMXJefferson, Walker50 min
May 4, 11:45 AM CDTAreal Flood AdvisoryBMXJefferson2 hr
May 4, 11:49 AM CDTSevere Thunderstorm WarningBMXBlount, Jefferson, St. Clair26 min
May 4, 12:03 PM CDTFlash Flood WarningBMXBlount, Etowah, St. Clair117 min
May 4, 12:10 PM CDTFlash Flood WarningBMXJefferson7 hr
May 4, 12:14 PM CDTSevere Thunderstorm WarningBMXCalhoun, St. Clair, Talladega46 min
May 4, 12:17 PM CDTSevere Thunderstorm WarningBMXJefferson, St. Clair, Shelby28 min
May 4, 12:35 PM CDTFlash Flood WarningBMXCalhoun, Etowah, St. Clair, Talladega3 hr
May 4, 12:56 PM CDTSevere Thunderstorm WarningBMXCalhoun, Cherokee, Cleburne, Talladega64 min
May 4, 1:15 PM CDTSevere Thunderstorm WarningBMXJefferson, Shelby30 min
May 4, 1:25 PM CDTTornado WarningBMXCleburne24 min
May 4, 1:39 PM CDTFlash Flood WarningBMXJefferson, St. Clair, Shelby5 hr
May 4, 2:07 PM CDTAreal Flood WarningBMXBlount, Calhoun, Cherokee, Etowah, St. Clair6 hr
May 4, 2:54 PM CDTAreal Flood AdvisoryBMXClay, Cleburne, Randolph, Shelby, Talladega3 hr
May 4, 3:50 PM CDTSevere Thunderstorm WarningBMXSumter55 min
May 4, 4:01 PM CDTFlash Flood WarningBMXShelby, Talladega3 hr
May 4, 4:05 PM CDTFlash Flood WarningBMXBibb, Tuscaloosa3 hr
May 4, 4:13 PM CDTSevere Thunderstorm WarningBMXTuscaloosa29 min
May 4, 4:20 PM CDTSevere Thunderstorm WarningBMXGreene55 min
May 4, 4:30 PM CDTSevere Thunderstorm WarningBMXHale, Marengo63 min
May 4, 4:45 PM CDTSpecial Weather StatementBMXWalker, Winston30 min
May 4, 5:00 PM CDTSevere Thunderstorm WarningBMXBibb, Chilton, Dallas, Perry75 min
May 4, 5:29 PM CDTSevere Thunderstorm WarningBMXAutauga, Chilton, Lowndes76 min
May 4, 5:30 PM CDTTornado WarningBMXChilton, Perry30 min
May 4, 5:38 PM CDTTornado WarningBMXShelby12 min
May 4, 5:54 PM CDTSevere Thunderstorm WarningBMXCoosa50 min
May 4, 5:59 PM CDTSevere Thunderstorm WarningBMXElmore61 min
May 4, 6:07 PM CDTSevere Thunderstorm WarningBMXMontgomery68 min
May 4, 6:19 PM CDTSevere Thunderstorm WarningBMXTallapoosa56 min
May 4, 6:24 PM CDTTornado WarningBMXElmore, Montgomery13 min
May 4, 6:37 PM CDTSevere Thunderstorm WarningBMXBullock, Macon, Pike83 min
May 4, 6:41 PM CDTSevere Thunderstorm WarningBMXChambers, Lee61 min
May 4, 6:48 PM CDTRiver Flood WarningBMXBibb, Jefferson, Shelby22 hr

Nearby

Flash Flood Warnings in Alabama, 2021Every 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.