Alert archive / Alabama / Flash Flood Warnings in 2021

Flash Flood Warning 11, NWS Birmingham, AL

March 31, 2021Blount County, Walker County, Winston County, Alabama

NWS Birmingham, AL issued this flash flood warning at Mar 31, 2021, 7:11 AM CDT for Blount County, Walker County, Winston County, Alabama. It was in force for 6 hr. 2 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, 7:11 AM CDT (12:11 UTC)
Expired: Mar 31, 2021, 1:38 PM CDT
In force: 6 hr
Issued by: NWS Birmingham, AL
Area: Storm-based polygon
Flood severity: None

Counties Blount County, AL, Walker County, AL, Winston County, AL

The radar

The Birmingham radar (KBMX), 88 km from the middle of the area, began a volume at 12:14 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
Mar 31, 9:25 AM CDT	FLASH FLOOD	1 E Hayden, AL	FLOODING ALONG VALLEY TRAIL, ARMSTRONG LOOP ROAD. ONE TREE REPORTED DOWN IN THIS AREA THAT FELL ONTO A SHED. ALSO IN ONEONTA, FLOODING 1ST AVENUE EAST TO 132 AND AT HIGH ROCK ROAD NEAR HAYDEN. TIME ESTIMATED BY RADAR.
Mar 31, 9:34 AM CDT	FLASH FLOOD	1 Ene Lupton, AL	SECTION OF WINDHAM LOOP WASHED OUT BY RUSHING WATER.

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, 0.2 hours before the alert went out and 87 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: 455 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 527 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 273 m²/s²
0-3 km storm-relative helicity: 283 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 3.5

Open this sounding in Storm Lab

The text

As transmitted.

000 
WGUS54 KBMX 311211
FFWBMX
ALC009-127-133-311515-
/O.NEW.KBMX.FF.W.0011.210331T1211Z-210331T1515Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

The National Weather Service in Birmingham has issued a

* Flash Flood Warning for...
  Blount County in central Alabama...
  Northeastern Walker County in central Alabama...
  Southeastern Winston County in northwestern Alabama...

* Until 1015 AM CDT.

* At 711 AM 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...
  Jasper, Oneonta, Springville, Sumiton, Cordova, Blountsville, 
  Cleveland, Arley, Dallas, Warrior, Locust Fork, Double Springs, 
  Altoona, Snead, Susan Moore, Walnut Grove, Trafford, Allgood, 
  Fairview and Hayden.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Please report flooding to your local law enforcement agency when you 
can do so safely.

A Flash Flood Warning means that flooding is imminent or occurring. 
If you are in the warned area move to higher ground immediately. 
Residents living along streams and creeks should take immediate 
precautions to protect life and property.

&&

LAT...LON 3417 8740 3417 8711 3399 8711 3399 8715
      3389 8709 3386 8696 3393 8689 3397 8677
      3425 8652 3426 8645 3410 8630 3394 8637
      3393 8632 3382 8643 3379 8658 3377 8658
      3384 8676 3384 8688 3376 8702 3378 8738

FLASH FLOOD...RADAR INDICATED

$$

56

3 follow-up statements

695 
WGUS54 KBMX 311508
FFWBMX
ALC009-127-133-311645-
/O.EXT.KBMX.FF.W.0011.000000T0000Z-210331T1645Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Birmingham AL
1008 AM CDT Wed Mar 31 2021

The National Weather Service in Birmingham has extended the

* Flash Flood Warning for...
  Blount County in central Alabama...
  Northeastern Walker County in central Alabama...
  Southeastern Winston County in northwestern Alabama...

* Until 1145 AM CDT.

* At 1008 AM CDT, Continuous rainfall across the area has caused 
  many streams and creeks to overflow. Flash flooding is ongoing or 
  expected to begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Doppler radar and automated gauges.

  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...
  Jasper, Oneonta, Springville, Sumiton, Cordova, Blountsville, 
  Cleveland, Arley, Dallas, Warrior, Locust Fork, Double Springs, 
  Altoona, Snead, Susan Moore, Walnut Grove, Trafford, Allgood, 
  Fairview and Hayden.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Please report flooding to your local law enforcement agency when you 
can do so safely.

A Flash Flood Warning means that flooding is imminent or occurring. 
If you are in the warned area move to higher ground immediately. 
Residents living along streams and creeks should take immediate 
precautions to protect life and property.

&&

LAT...LON 3417 8740 3417 8711 3399 8711 3399 8715
      3389 8709 3386 8696 3393 8689 3397 8677
      3425 8652 3426 8645 3410 8630 3394 8637
      3393 8632 3382 8643 3379 8658 3377 8658
      3384 8676 3384 8688 3376 8702 3378 8738

FLASH FLOOD...RADAR AND GAUGE INDICATED

$$

252 
WGUS54 KBMX 311627
FFWBMX
ALC009-127-133-311845-
/O.EXT.KBMX.FF.W.0011.000000T0000Z-210331T1845Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Birmingham AL
1127 AM CDT Wed Mar 31 2021

The National Weather Service in Birmingham has extended the

* Flash Flood Warning for...
  Blount County in central Alabama...
  Northeastern Walker County in central Alabama...
  Southeastern Winston County in northwestern Alabama...

* Until 145 PM CDT.

* At 1127 AM CDT, Heavy rainfall will be possible over the area for 
  the next couple of hours. Flash flooding is ongoing or expected to 
  begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Doppler radar and automated gauges.

  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...
  Jasper, Oneonta, Springville, Sumiton, Cordova, Blountsville, 
  Cleveland, Arley, Dallas, Warrior, Locust Fork, Double Springs, 
  Altoona, Snead, Susan Moore, Walnut Grove, Trafford, Allgood, 
  Fairview and Hayden.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Please report flooding to your local law enforcement agency when you 
can do so safely.

A Flash Flood Warning means that flooding is imminent or occurring. 
If you are in the warned area move to higher ground immediately. 
Residents living along streams and creeks should take immediate 
precautions to protect life and property.

&&

LAT...LON 3417 8740 3417 8711 3399 8711 3399 8715
      3389 8709 3386 8696 3393 8689 3397 8677
      3425 8652 3426 8645 3410 8630 3394 8637
      3393 8632 3382 8643 3379 8658 3377 8658
      3384 8676 3384 8688 3376 8702 3378 8738

FLASH FLOOD...RADAR AND GAUGE INDICATED

$$

88

554 
WGUS74 KBMX 311838
FFSBMX

Flash Flood Statement
National Weather Service Birmingham AL
138 PM CDT Wed Mar 31 2021

ALC009-127-133-311848-
/O.CAN.KBMX.FF.W.0011.000000T0000Z-210331T1845Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Blount AL-Walker AL-Winston AL-
138 PM CDT Wed Mar 31 2021

...FLASH FLOOD WARNING FOR BLOUNT, NORTHEASTERN WALKER AND 
SOUTHEASTERN WINSTON COUNTIES HAS BEEN REPLACED WITH A FLOOD 
WARNING...

The heavy rain has moved out of the warned area, however creek and 
stream levels will still remain elevated or in minor flood for 
several more hours.

LAT...LON 3417 8740 3417 8711 3399 8711 3399 8715
      3389 8709 3386 8696 3393 8689 3397 8677
      3425 8652 3426 8645 3410 8630 3394 8637
      3393 8632 3382 8643 3379 8658 3377 8658
      3384 8676 3384 8688 3376 8702 3378 8738

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 30, 8:53 PM CDT	River Flood Warning	BMX	Greene, Marengo, Sumter	3 days
Mar 31, 2:10 AM CDT	Tornado Warning	BMX	Lamar, Marion	15 min
Mar 31, 4:38 AM CDT	Flash Flood Warning	BMX	Fayette, Lamar, Marion, Walker, Winston	4 hr
Mar 31, 5:56 AM CDT	Special Weather Statement	BMX	Fayette, Lamar, Marion	64 min
Mar 31, 6:54 AM CDT	Special Weather Statement	BMX	Winston	51 min
Mar 31, 7:06 AM CDT	Special Weather Statement	BMX	Walker	54 min
Mar 31, 7:51 AM CDT	Special Weather Statement	BMX	Blount	54 min
Mar 31, 8:42 AM CDT	Flash Flood Warning	BMX	Jefferson, Pickens, Tuscaloosa	3 hr
Mar 31, 9:32 AM CDT	Flash Flood Warning	BMX	Bibb, Shelby	3 hr
Mar 31, 9:38 AM CDT	Special Weather Statement	BMX	Cleburne	52 min
Mar 31, 9:41 AM CDT	Special Weather Statement	BMX	Tuscaloosa	49 min
Mar 31, 10:12 AM CDT	Areal Flood Advisory	BMX	Etowah	2 hr
Mar 31, 10:22 AM CDT	Special Weather Statement	BMX	Bibb	38 min
Mar 31, 10:53 AM CDT	Special Weather Statement	BMX	Sumter	37 min
Mar 31, 10:56 AM CDT	Flash Flood Warning	BMX	Etowah	3 hr
Mar 31, 11:02 AM CDT	Severe Thunderstorm Warning	BMX	Sumter	43 min
Mar 31, 11:23 AM CDT	Severe Thunderstorm Warning	BMX	Greene	15 min
Mar 31, 11:49 AM CDT	Areal Flood Advisory	BMX	Jefferson, St. Clair, Tuscaloosa	3 hr
Mar 31, 12:09 PM CDT	Areal Flood Advisory	BMX	Bibb, Shelby	111 min
Mar 31, 12:56 PM CDT	Special Weather Statement	BMX	Marengo	49 min
Mar 31, 12:57 PM CDT	Areal Flood Warning	BMX	Cherokee	24 hr
Mar 31, 1:07 PM CDT	River Flood Warning	BMX	Calhoun, Cherokee, Etowah, St. Clair	67 hr
Mar 31, 1:13 PM CDT	Severe Thunderstorm Warning	BMX	Marengo	14 min
Mar 31, 1:33 PM CDT	Severe Thunderstorm Warning	BMX	Marengo	57 min
Mar 31, 1:38 PM CDT	Areal Flood Warning	BMX	Blount, Walker, Winston	6 hr
Mar 31, 1:55 PM CDT	Special Weather Statement	BMX	Montgomery	35 min
Mar 31, 2:01 PM CDT	Areal Flood Advisory	BMX	Etowah	4 hr
Mar 31, 2:33 PM CDT	Special Weather Statement	BMX	Lowndes	27 min
Mar 31, 2:40 PM CDT	Freeze Watch	BMX	Autauga, Barbour, Bibb, Blount, Bullock, Calhoun and 33 more	13 hr
Mar 31, 2:58 PM CDT	River Flood Warning	BMX	Jefferson, Tuscaloosa, Walker	42 hr
Mar 31, 4:01 PM CDT	Special Weather Statement	BMX	Pike	44 min
Mar 31, 4:11 PM CDT	Areal Flood Advisory	BMX	Pike	2 hr
Mar 31, 6:04 PM CDT	Wind Advisory	BMX	Autauga, Barbour, Bibb, Blount, Bullock, Calhoun and 33 more	24 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.