Alert archive / Alabama / Flash Flood Warnings in 2021

Flash Flood Warning 10, NWS Birmingham, AL

March 31, 20215 counties in Alabama

NWS Birmingham, AL issued this flash flood warning at Mar 31, 2021, 4:38 AM CDT for 5 counties in Alabama. It was in force for 4 hr. 3 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
Mar 31, 2021, 4:38 AM CDT (09:38 UTC)
Expired
Mar 31, 2021, 8:45 AM CDT
In force
4 hr
Issued by
NWS Birmingham, AL
Area
Storm-based polygon
Flood severity
None

Counties Fayette County, AL, Lamar County, AL, Marion County, AL, Walker County, AL, Winston County, AL

The radar

The Columbus AFB radar (KGWX), 43 km from the middle of the area, began a volume at 09:42 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
Mar 31, 6:31 AM CDTFLASH FLOODGuin, ALAT LEAST SIX INCHES OF FLOWING WATER REPORTED IN GUIN IN SOME PLACES. REPORT VIA SOCIAL MEDIA.
Mar 31, 7:19 AM CDTFLASH FLOODNauvoo, ALREPORTS OF A WATER RESCUE DUE TO FLASH FLOODING IN NAUVOO. CREEKS ARE OUT OF THEIR BANKS.
Mar 31, 7:52 AM CDTFLASH FLOODGuin, ALGUIN PD REPORTS A SECTION OF 15TH. AVE HAS WASHED AWAY NEAR THE SOFTBALL FIELD. CREEKS PASSING UNDER HWY. 43 ARE CONTINUING TO RISE & COULD POSSIBLY BEGIN TO SPILL OUT INTO THE ROAD SOON. 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 00:00Z, 9.6 hours before the alert went out and 137 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 00:00Z on 2021-03-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 127 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Birmingham, AL at 00:00Z on 2021-03-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 74 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
127 J/kg
Mixed-layer CIN
-12 J/kg
Mixed-layer LCL
1179 m above ground
0-6 km bulk shear
42 kt
0-1 km storm-relative helicity
74 m²/s²
0-3 km storm-relative helicity
179 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

Open this sounding in Storm Lab

The text

As transmitted.

375 
WGUS54 KBMX 310938
FFWBMX
ALC057-075-093-127-133-311245-
/O.NEW.KBMX.FF.W.0010.210331T0938Z-210331T1245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Birmingham AL
438 AM CDT Wed Mar 31 2021

The National Weather Service in Birmingham has issued a

* Flash Flood Warning for...
  Northwestern Walker County in central Alabama...
  Southern Marion County in northwestern Alabama...
  Southwestern Winston County in northwestern Alabama...
  Northwestern Fayette County in west central Alabama...
  Northern Lamar County in west central Alabama...

* Until 745 AM CDT.

* At 438 AM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 2 and 4 inches of rain 
  have fallen. 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...
  Winfield, Carbon Hill, Sulligent, Lynn, Guin, Brilliant, Glen 
  Allen, Detroit, Kansas, Nauvoo, Beaverton, Gu-Win, Eldridge, 
  Crews, Lamar County Airport, Ashbank, Poplar Springs, Twin, 
  Natural Bridge and Tucker.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3410 8820 3411 8739 3388 8738 3381 8824

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

$$

87/Grantham
1 follow-up statement
607 
WGUS54 KBMX 311143
FFWBMX
ALC057-075-093-127-133-311345-
/O.EXT.KBMX.FF.W.0010.000000T0000Z-210331T1345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Birmingham AL
643 AM CDT Wed Mar 31 2021

The National Weather Service in Birmingham has extended the

* Flash Flood Warning for...
  Northwestern Walker County in central Alabama...
  Southern Marion County in northwestern Alabama...
  Southwestern Winston County in northwestern Alabama...
  Northwestern Fayette County in west central Alabama...
  Northern Lamar County in west central Alabama...

* Until 845 AM CDT.

* At 643 AM CDT, Thunderstorms producing heavy rain continues across 
  the warned area. Between 2 and 4 inches of rain have already 
  fallen. Flash flooding is ongoing or expected to begin shortly. 
  Reports of flooding have already come in from Guin.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Public.

  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...
  Winfield, Carbon Hill, Sulligent, Lynn, Guin, Brilliant, Glen 
  Allen, Detroit, Kansas, Nauvoo, Beaverton, Gu-Win, Eldridge, 
  Crews, Lamar County Airport, Ashbank, Poplar Springs, Twin, 
  Natural Bridge and Tucker.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3410 8820 3411 8739 3388 8738 3381 8824

FLASH FLOOD...OBSERVED
EXPECTED RAINFALL...1-2 INCHES IN 2 HOURS 

$$

56

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 30, 8:53 PM CDTRiver Flood WarningBMXGreene, Marengo, Sumter3 days
Mar 31, 2:10 AM CDTTornado WarningBMXLamar, Marion15 min
Mar 31, 5:56 AM CDTSpecial Weather StatementBMXFayette, Lamar, Marion64 min
Mar 31, 6:54 AM CDTSpecial Weather StatementBMXWinston51 min
Mar 31, 7:06 AM CDTSpecial Weather StatementBMXWalker54 min
Mar 31, 7:11 AM CDTFlash Flood WarningBMXBlount, Walker, Winston6 hr
Mar 31, 7:51 AM CDTSpecial Weather StatementBMXBlount54 min
Mar 31, 8:42 AM CDTFlash Flood WarningBMXJefferson, Pickens, Tuscaloosa3 hr
Mar 31, 9:32 AM CDTFlash Flood WarningBMXBibb, Shelby3 hr
Mar 31, 9:38 AM CDTSpecial Weather StatementBMXCleburne52 min
Mar 31, 9:41 AM CDTSpecial Weather StatementBMXTuscaloosa49 min
Mar 31, 10:12 AM CDTAreal Flood AdvisoryBMXEtowah2 hr
Mar 31, 10:22 AM CDTSpecial Weather StatementBMXBibb38 min
Mar 31, 10:53 AM CDTSpecial Weather StatementBMXSumter37 min
Mar 31, 10:56 AM CDTFlash Flood WarningBMXEtowah3 hr
Mar 31, 11:02 AM CDTSevere Thunderstorm WarningBMXSumter43 min
Mar 31, 11:23 AM CDTSevere Thunderstorm WarningBMXGreene15 min
Mar 31, 11:49 AM CDTAreal Flood AdvisoryBMXJefferson, St. Clair, Tuscaloosa3 hr
Mar 31, 12:09 PM CDTAreal Flood AdvisoryBMXBibb, Shelby111 min
Mar 31, 12:56 PM CDTSpecial Weather StatementBMXMarengo49 min
Mar 31, 12:57 PM CDTAreal Flood WarningBMXCherokee24 hr
Mar 31, 1:07 PM CDTRiver Flood WarningBMXCalhoun, Cherokee, Etowah, St. Clair67 hr
Mar 31, 1:13 PM CDTSevere Thunderstorm WarningBMXMarengo14 min
Mar 31, 1:33 PM CDTSevere Thunderstorm WarningBMXMarengo57 min
Mar 31, 1:38 PM CDTAreal Flood WarningBMXBlount, Walker, Winston6 hr
Mar 31, 1:55 PM CDTSpecial Weather StatementBMXMontgomery35 min
Mar 31, 2:01 PM CDTAreal Flood AdvisoryBMXEtowah4 hr
Mar 31, 2:33 PM CDTSpecial Weather StatementBMXLowndes27 min
Mar 31, 2:40 PM CDTFreeze WatchBMXAutauga, Barbour, Bibb, Blount, Bullock, Calhoun and 33 more13 hr
Mar 31, 2:58 PM CDTRiver Flood WarningBMXJefferson, Tuscaloosa, Walker42 hr
Mar 31, 4:01 PM CDTSpecial Weather StatementBMXPike44 min
Mar 31, 4:11 PM CDTAreal Flood AdvisoryBMXPike2 hr
Mar 31, 6:04 PM CDTWind AdvisoryBMXAutauga, Barbour, Bibb, Blount, Bullock, Calhoun and 33 more24 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.