Alert archive / Alabama / Flash Flood Warnings in 2021

Flash Flood Warning 32, NWS Birmingham, AL

June 19, 2021Cherokee County, Alabama

NWS Birmingham, AL issued this flash flood warning at Jun 19, 2021, 9:53 PM CDT for Cherokee County, Alabama. It was in force for 3 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: Jun 19, 2021, 9:53 PM CDT (02:53 UTC)
Expired: Jun 20, 2021, 1:00 AM CDT
In force: 3 hr
Issued by: NWS Birmingham, AL
Area: Storm-based polygon
Flood severity: None

County Cherokee County, AL

The radar

The Northeast Alabama radar (KHTX), 75 km from the middle of the area, began a volume at 02:57 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 19, 11:41 PM CDT	FLASH FLOOD	3 E Little River Falls, AL	ONE FOOT OF WATER FLOWING OVER ROADWAY AT BRIDGE ON COUNTY ROAD 15.
Jun 19, 11:58 PM CDT	FLASH FLOOD	Broomtown, AL	NUMEROUS ROADWAYS FLOODED IN/AROUND THE NORTHERN PART OF THE COUNTY, INCLUDING BROOMTOWN.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 00:00Z, 2.9 hours before the alert went out and 153 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: 252 J/kg
Mixed-layer CIN: -116 J/kg
Mixed-layer LCL: 651 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 340 m²/s²
0-3 km storm-relative helicity: 516 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 4.7

Open this sounding in Storm Lab

The text

As transmitted.

318 
WGUS54 KBMX 200253
FFWBMX
ALC019-200600-
/O.NEW.KBMX.FF.W.0032.210620T0253Z-210620T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Birmingham AL
953 PM CDT Sat Jun 19 2021

The National Weather Service in Birmingham has issued a

* Flash Flood Warning for...
  Central Cherokee County in northeastern Alabama...

* Until 100 AM CDT.

* At 953 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 1 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...
  Cedar Bluff, Little River Canyon National Preserve, Leesburg, Sand 
  Rock, Gaylesville, Blanche, Cornwall Furnace Park, Little River 
  Falls, Eastern Weiss Lake, Western Weiss Lake, Broomtown, 
  Fullerton, New Moon, Chesnut Bay Resort, Yellow Creek Falls and 
  Chesterfield.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3421 8545 3420 8584 3424 8584 3424 8581
      3426 8581 3426 8577 3434 8568 3436 8566
      3437 8564 3439 8562 3440 8563 3440 8561
      3444 8558 3447 8558 3447 8557 3448 8558
      3449 8556 3450 8556 3450 8555 3452 8551

FLASH FLOOD...RADAR INDICATED

$$

87/Grantham

1 follow-up statement

161 
WGUS74 KBMX 200512
FFSBMX

Flash Flood Statement
National Weather Service Birmingham AL
1212 AM CDT Sun Jun 20 2021

ALC019-200600-
/O.CON.KBMX.FF.W.0032.000000T0000Z-210620T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Cherokee AL-
1212 AM CDT Sun Jun 20 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1 AM CDT EARLY THIS 
MORNING FOR CENTRAL CHEROKEE COUNTY...

At 1212 AM CDT, Emergency Management reported thunderstorms 
producing heavy rain across the warned area. Between 2 and 3 inches 
of rain have fallen. Additional rainfall amounts of 1 to 2 inches 
are possible in the warned area. Flash flooding is already occurring.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Emergency Management reported.

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...
  Cedar Bluff, Little River Canyon National Preserve, Leesburg, Sand 
  Rock, Gaylesville, Blanche, Cornwall Furnace Park, Little River 
  Falls, Eastern Weiss Lake, Western Weiss Lake, Broomtown, 
  Fullerton, New Moon, Chesnut Bay Resort, Yellow Creek Falls and 
  Chesterfield.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

In hilly terrain there are hundreds of low water crossings which are 
potentially dangerous in heavy rain. Do not attempt to cross flooded 
roads. Find an alternate route.

&&

LAT...LON 3421 8545 3420 8584 3424 8584 3424 8581
      3426 8581 3426 8577 3434 8568 3436 8566
      3437 8564 3439 8562 3440 8563 3440 8561
      3444 8558 3447 8558 3447 8557 3448 8558
      3449 8556 3450 8556 3450 8555 3452 8551

FLASH FLOOD...OBSERVED

$$

40/Sizemore

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 19, 8:53 PM CDT	Areal Flood Advisory	BMX	Jefferson, Shelby	3 hr
Jun 19, 9:06 PM CDT	Flash Flood Warning	BMX	Jefferson	5 hr
Jun 19, 11:29 PM CDT	Special Weather Statement	BMX	Bullock, Macon, Pike	46 min
Jun 19, 11:53 PM CDT	Areal Flood Advisory	BMX	Blount	3 hr
Jun 20, 12:15 AM CDT	Special Weather Statement	BMX	Barbour, Russell	45 min
Jun 20, 1:05 AM CDT	Areal Flood Warning	BMX	Tuscaloosa	7 hr
Jun 20, 1:12 AM CDT	Areal Flood Warning	BMX	Cherokee	6 hr
Jun 20, 1:15 AM CDT	Areal Flood Advisory	BMX	Etowah	4 hr
Jun 20, 1:57 AM CDT	Areal Flood Advisory	BMX	Barbour	2 hr
Jun 20, 2:00 AM CDT	Flash Flood Warning	BMX	Jefferson	3 hr
Jun 20, 4:16 AM CDT	Areal Flood Warning	BMX	Cherokee	32 hr
Jun 20, 10:06 AM CDT	River Flood Warning	BMX	Greene, Hale, Marengo	5 days

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.