Alert archive / Alabama / Flash Flood Warnings in 2021

Flash Flood Warning 34, NWS Birmingham, AL

June 22, 2021Blount County, Jefferson County, St. Clair County, Alabama

NWS Birmingham, AL issued this flash flood warning at Jun 22, 2021, 1:13 AM CDT for Blount County, Jefferson County, St. Clair 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: Jun 22, 2021, 1:13 AM CDT (06:13 UTC)
Expired: Jun 22, 2021, 4:00 AM CDT
In force: 3 hr
Issued by: NWS Birmingham, AL
Area: Storm-based polygon
Flood severity: None

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

The radar

The Birmingham radar (KBMX), 85 km from the middle of the area, began a volume at 06:14 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
Jun 22, 3:10 AM CDT	FLASH FLOOD	Ashville, AL	USGS GUAGE AT BIG CANOE CREEK IS REPORTING WATER LEVELS RISING ABOVE FLOOD STAGE NEAR ASHVILLE.

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, 6.2 hours before the alert went out and 85 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: 1191 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 1003 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 119 m²/s²
0-3 km storm-relative helicity: 126 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 4.2

Open this sounding in Storm Lab

The text

As transmitted.

205 
WGUS54 KBMX 220613
FFWBMX
ALC009-073-115-220900-
/O.NEW.KBMX.FF.W.0034.210622T0613Z-210622T0900Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Birmingham AL
113 AM CDT Tue Jun 22 2021

The National Weather Service in Birmingham has issued a

* Flash Flood Warning for...
  Blount County in central Alabama...
  Northeastern Jefferson County in central Alabama...
  Northern St. Clair County in central Alabama...

* Until 400 AM CDT.

* At 113 AM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 3 inches of rain 
  have fallen. The expected rainfall rate is 1 to 3 inches an hour. 
  Additional rainfall amounts of 2 to 3 inches are possible across 
  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...
  Gardendale, Rainbow City, Oneonta, Springville, Sumiton, 
  Blountsville, Cleveland, Dallas, Clay, Pinson, Argo, Warrior, 
  Kimberly, Ashville, Morris, Ragland, Locust Fork, Ohatchee, Steele 
  and Altoona.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

&&

LAT...LON 3387 8696 3387 8692 3391 8692 3397 8677
      3405 8668 3408 8670 3414 8649 3410 8631
      3394 8637 3394 8633 3399 8628 3397 8625
      3399 8620 3390 8614 3386 8606 3377 8604
      3373 8611 3370 8704 3377 8702 3380 8695

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

$$

40/Sizemore

1 follow-up statement

628 
WGUS74 KBMX 220725
FFSBMX

Flash Flood Statement
National Weather Service Birmingham AL
225 AM CDT Tue Jun 22 2021

ALC009-073-115-220900-
/O.CON.KBMX.FF.W.0034.000000T0000Z-210622T0900Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Blount AL-Jefferson AL-St. Clair AL-
225 AM CDT Tue Jun 22 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 4 AM CDT EARLY THIS 
MORNING FOR BLOUNT, NORTHEASTERN JEFFERSON AND NORTHERN ST. CLAIR 
COUNTIES...

At 225 AM CDT, Doppler radar indicated thunderstorms producing heavy 
rain across the warned area. Between 2 and 4 inches of rain have 
fallen. The expected rainfall rate is 1 to 2 inches in 1 hour. 
Additional rainfall amounts up to 1 inch 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...
  Gardendale, Rainbow City, Oneonta, Springville, Sumiton, 
  Blountsville, Cleveland, Dallas, Clay, Pinson, Argo, Warrior, 
  Kimberly, Ashville, Morris, Ragland, Locust Fork, Ohatchee, Steele 
  and Altoona.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

&&

LAT...LON 3387 8696 3387 8692 3391 8692 3397 8677
      3405 8668 3408 8670 3414 8649 3410 8631
      3394 8637 3394 8633 3399 8628 3397 8625
      3399 8620 3390 8614 3386 8606 3377 8604
      3373 8611 3370 8704 3377 8702 3380 8695

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

$$

40/Sizemore

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 21, 10:19 PM CDT	Areal Flood Advisory	BMX	Blount, Calhoun, Etowah, Jefferson, St. Clair, Walker	3 hr
Jun 21, 10:40 PM CDT	Areal Flood Advisory	BMX	Marion, Winston	3 hr
Jun 22, 2:52 AM CDT	Areal Flood Advisory	BMX	Calhoun, Cherokee, Etowah	3 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.