Alert archive / Alabama / Flash Flood Warnings in 2021

Flash Flood Warning 55, NWS Birmingham, AL

October 4, 2021Lowndes County, Montgomery County, Alabama

NWS Birmingham, AL issued this flash flood warning at Oct 4, 2021, 3:28 PM CDT for Lowndes County, Montgomery 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: Oct 4, 2021, 3:28 PM CDT (20:28 UTC)
Expired: Oct 4, 2021, 6:30 PM CDT
In force: 3 hr
Issued by: NWS Birmingham, AL
Area: Storm-based polygon
Flood severity: None

Counties Lowndes County, AL, Montgomery County, AL

The radar

The Maxwell AFB radar (KMXX), 55 km from the middle of the area, began a volume at 20:30 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
Oct 4, 3:55 PM CDT	FLASH FLOOD	Lowndesboro, AL	SEVERAL ROADS WERE WASHED OUT NEAR LOWNDESBORO. HIGHWAY 80 WAS TEMPORARILY IMPASSABLE IN A FEW 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, 8.5 hours before the alert went out and 97 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: 565 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 616 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 34 m²/s²
0-3 km storm-relative helicity: 69 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

As transmitted.

452 
WGUS54 KBMX 042028
FFWBMX
ALC085-101-042330-
/O.NEW.KBMX.FF.W.0055.211004T2028Z-211004T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Birmingham AL
328 PM CDT Mon Oct 4 2021

The National Weather Service in Birmingham has issued a

* Flash Flood Warning for...
  Northeastern Lowndes County in south central Alabama...
  Northern Montgomery County in south central Alabama...

* Until 630 PM CDT.

* At 328 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 2 and 3 inches of rain 
  have fallen. Additional rainfall amounts of 2 to 3 inches are 
  possible in 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...
  Montgomery, Mosses, White Hall, Lowndesboro, Dannelly Field, 
  Woodcrest, Hope Hull, Hunter, Maxwell Air Force Base, Hyundai 
  Motors Of Alabama, Montgomery Riverwalk Stadium, Alabama State 
  Capitol, Alabama State University, Montgomery Zoo, Boylston, 
  Pinedale, Gunter Air Force Base, Lagoon Park, Eastdale Mall and 
  Auburn University In Montgomery.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3234 8650 3239 8646 3243 8634 3241 8631
      3244 8632 3246 8625 3245 8619 3245 8618
      3244 8619 3242 8611 3241 8605 3242 8603
      3235 8601 3230 8614 3216 8677 3236 8675
      3236 8660 3238 8658 3237 8654 3234 8653

FLASH FLOOD...RADAR INDICATED

$$

25/Owen

1 follow-up statement

603 
WGUS74 KBMX 042324
FFSBMX

Flash Flood Statement
National Weather Service Birmingham AL
624 PM CDT Mon Oct 4 2021

ALC085-101-042334-
/O.EXP.KBMX.FF.W.0055.000000T0000Z-211004T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Lowndes AL-Montgomery AL-
624 PM CDT Mon Oct 4 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 630 PM CDT THIS EVENING FOR 
NORTHEASTERN LOWNDES AND NORTHERN MONTGOMERY COUNTIES...

The heavy rain has ended. Flooding is no longer expected to pose a 
threat. Please continue to heed remaining road closures.

A Flash Flood Watch remains in effect until 100 AM CDT Wednesday for 
a portion of central Alabama.

LAT...LON 3234 8650 3239 8646 3243 8634 3241 8631
      3244 8632 3246 8625 3245 8619 3245 8618
      3244 8619 3242 8611 3241 8605 3242 8603
      3235 8601 3230 8614 3216 8677 3236 8675
      3236 8660 3238 8658 3237 8654 3234 8653

$$

25/Owen

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 3, 8:04 PM CDT	Areal Flood Advisory	BMX	Fayette, Walker	116 min
Oct 3, 9:05 PM CDT	Flash Flood Warning	BMX	Fayette, Jefferson, Marion, Walker	3 hr
Oct 3, 10:59 PM CDT	Areal Flood Advisory	BMX	Jefferson	3 hr
Oct 4, 12:53 AM CDT	Areal Flood Advisory	BMX	Jefferson, St. Clair, Shelby	3 hr
Oct 4, 1:23 AM CDT	Dense Fog Advisory	BMX	Blount, Fayette, Lamar, Marion, Pickens, Tuscaloosa and 2 more	8 hr
Oct 4, 3:11 AM CDT	Flash Flood Watch	BMX	Autauga, Barbour, Bibb, Blount, Bullock, Calhoun and 30 more	3 days
Oct 4, 9:37 AM CDT	Areal Flood Advisory	BMX	Lee	3 hr
Oct 4, 11:51 AM CDT	Areal Flood Advisory	BMX	Russell	3 hr
Oct 4, 12:20 PM CDT	Flash Flood Warning	BMX	Lee, Russell	3 hr
Oct 4, 12:44 PM CDT	Areal Flood Advisory	BMX	Lowndes, Montgomery	3 hr
Oct 4, 1:33 PM CDT	Flash Flood Warning	BMX	Montgomery	87 min
Oct 4, 3:12 PM CDT	Special Weather Statement	BMX	Coosa	33 min
Oct 4, 3:21 PM CDT	Flash Flood Warning	BMX	Lee, Russell	3 hr
Oct 4, 4:40 PM CDT	Areal Flood Advisory	BMX	Chilton, Coosa	3 hr
Oct 4, 4:56 PM CDT	Flash Flood Warning	BMX	Chilton	3 hr
Oct 4, 5:09 PM CDT	Special Weather Statement	BMX	Bibb	36 min
Oct 4, 5:09 PM CDT	Special Weather Statement	BMX	Shelby	36 min
Oct 4, 5:16 PM CDT	Severe Thunderstorm Warning	BMX	Bibb	29 min
Oct 4, 5:22 PM CDT	Special Weather Statement	BMX	Shelby	23 min
Oct 4, 5:43 PM CDT	Severe Thunderstorm Warning	BMX	Shelby	47 min
Oct 4, 5:47 PM CDT	Severe Thunderstorm Warning	BMX	Bibb, Shelby	43 min
Oct 4, 6:02 PM CDT	Special Weather Statement	BMX	Shelby	28 min
Oct 4, 6:17 PM CDT	Special Weather Statement	BMX	Jefferson	28 min
Oct 4, 6:34 PM CDT	Special Weather Statement	BMX	Jefferson	26 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.