Alert archive / Tennessee / Flash Flood Warnings in 2021

Flash Flood Warning 66, NWS Nashville, TN

September 21, 2021Cheatham County, Davidson County, Dickson County, Tennessee

NWS Nashville, TN issued this flash flood warning at Sep 21, 2021, 9:42 PM CDT for Cheatham County, Davidson County, Dickson County, Tennessee. It was in force for 60 min. 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: Sep 21, 2021, 9:42 PM CDT (02:42 UTC)
Expired: Sep 21, 2021, 10:42 PM CDT
In force: 60 min
Issued by: NWS Nashville, TN
Area: Storm-based polygon
Flood severity: None

Counties Cheatham County, TN, Davidson County, TN, Dickson County, TN

The radar

The Nashville radar (KOHX), 45 km from the middle of the area, began a volume at 02:46 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
Sep 21, 9:45 PM CDT	FLASH FLOOD	West Nashville, TN	SEVERAL ROADS FLOODED IN WEST NASHVILLE INCLUDING CHARLOTTE PIKE...21ST AVENUE...AND THE I-440 EXIT RAMP AT WEST END AVENUE

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

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 00:00Z, 2.7 hours before the alert went out and 38 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: 626 J/kg
Mixed-layer CIN: -26 J/kg
Mixed-layer LCL: 997 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 21 m²/s²
0-3 km storm-relative helicity: 10 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

560 
WGUS54 KOHX 220242
FFWOHX
TNC021-037-043-220445-
/O.NEW.KOHX.FF.W.0066.210922T0242Z-210922T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Nashville TN
942 PM CDT Tue Sep 21 2021

The National Weather Service in Nashville has issued a

* Flash Flood Warning for...
  Southeastern Cheatham County in middle Tennessee...
  Central Davidson County in middle Tennessee...
  East Central Dickson County in middle Tennessee...

* Until 1145 PM CDT.

* At 942 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 2.5 inches of 
  rain have fallen. 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...
  Ashland City, Nashville, Forest Hills, Oak Hill, White Bluff, 
  Belle Meade, Kingston Springs, Lakewood, Pegram, Bellevue, 
  Antioch, Hermitage, Berry Hill, Bells Bend and Green Hill.

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 3605 8718 3603 8719 3603 8720 3624 8719
      3624 8659 3606 8662 3605 8693 3604 8705
      3605 8705

FLASH FLOOD...RADAR INDICATED

$$

Barnwell

1 follow-up statement

697 
WGUS74 KOHX 220342
FFSOHX

Flash Flood Statement
National Weather Service Nashville TN
1042 PM CDT Tue Sep 21 2021

TNC021-037-043-220352-
/O.CAN.KOHX.FF.W.0066.000000T0000Z-210922T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Cheatham TN-Davidson TN-Dickson TN-
1042 PM CDT Tue Sep 21 2021

...FLASH FLOOD WARNING IS CANCELLED FOR SOUTHEASTERN CHEATHAM, 
CENTRAL DAVIDSON AND EAST CENTRAL DICKSON COUNTIES...

The heavy rain has ended. Minor flooding will remain possible as 
showers continue to weaken. Please continue to heed remaining road 
closures.

LAT...LON 3605 8718 3603 8719 3603 8720 3624 8719
      3624 8659 3606 8662 3605 8693 3604 8705
      3605 8705

$$

Barnwell

The office that day

Everything else NWS Nashville, TN issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 21, 8:02 PM CDT	River Flood Advisory	OHX	Perry	26 hr
Sep 21, 8:31 PM CDT	Areal Flood Advisory	OHX	Cheatham, Dickson	3 hr
Sep 21, 9:08 PM CDT	Areal Flood Advisory	OHX	Davidson	3 hr
Sep 21, 9:42 PM CDT	River Flood Warning	OHX	Humphreys	70 hr

Nearby

Flash Flood Warnings in Tennessee, 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.