Alert archive / Tennessee / Flash Flood Warnings in 2021

Flash Flood Warning 43, NWS Nashville, TN

July 31, 2021Cheatham County, Davidson County, Williamson County, Tennessee

NWS Nashville, TN issued this flash flood warning at Jul 31, 2021, 10:24 PM CDT for Cheatham County, Davidson County, Williamson County, Tennessee. It was in force for 4 hr. 3 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: Jul 31, 2021, 10:24 PM CDT (03:24 UTC)
Expired: Aug 1, 2021, 2:30 AM CDT
In force: 4 hr
Issued by: NWS Nashville, TN
Area: Storm-based polygon
Flood severity: None

Counties Cheatham County, TN, Davidson County, TN, Williamson County, TN

The radar

The Nashville radar (KOHX), 40 km from the middle of the area, began a volume at 03:24 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
Jul 31, 10:26 PM CDT	FLASH FLOOD	Nashville, TN	2 FEET OF WATER AT THE INTERSECTION OF 3RD AVENUE AND CRUTCHER IN EAST NASHVILLE.
Jul 31, 11:37 PM CDT	FLASH FLOOD	3 Nnw Belle Meade, TN	CHARLOTTE PIKE AT AMERICAN ROAD FLOODED AND IMPASSABLE
Jul 31, 11:50 PM CDT	FLASH FLOOD	Belle Meade, TN	RICHLAND CREEK IN BELLE MEADE AT HARDING PLACE REACHED MODERATE FLOOD STAGE AND BROWNS CREEK REACHED FLOOD STAGE. TIME GOTTEN OFF HYDROGRAPHS.

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, 3.4 hours before the alert went out and 33 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: 1106 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 1447 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 91 m²/s²
0-3 km storm-relative helicity: 251 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 5.3

Open this sounding in Storm Lab

The text

As transmitted.

178 
WGUS54 KOHX 010324
FFWOHX
TNC021-037-187-010530-
/O.NEW.KOHX.FF.W.0043.210801T0324Z-210801T0530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Nashville TN
1024 PM CDT Sat Jul 31 2021

The National Weather Service in Nashville has issued a

* Flash Flood Warning for...
  Southeastern Cheatham County in middle Tennessee...
  Davidson County in middle Tennessee...
  Northern Williamson County in middle Tennessee...

* Until 1230 AM CDT.

* At 1024 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 3 inches of rain 
  have already fallen this evening. Additional rainfall amounts of 1 
  to 2 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...
  Franklin, Ashland City, Nashville, Brentwood, La Vergne, 
  Nolensville, Forest Hills, Oak Hill, Belle Meade, Kingston 
  Springs, Pegram, Bellevue, Antioch, Berry Hill, Bells Bend and 
  Percy Priest Lake.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3602 8718 3607 8717 3617 8716 3617 8715
      3618 8715 3629 8714 3617 8657 3609 8655
      3601 8661 3594 8663 3600 8704

FLASH FLOOD...RADAR INDICATED

$$

Shamburger

1 follow-up statement

126 
WGUS54 KOHX 010507
FFWOHX
TNC021-037-187-010730-
/O.EXT.KOHX.FF.W.0043.000000T0000Z-210801T0730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Nashville TN
1207 AM CDT Sun Aug 1 2021

The National Weather Service in Nashville has extended the

* Flash Flood Warning for...
  Southeastern Cheatham County in middle Tennessee...
  Davidson County in middle Tennessee...
  Northern Williamson County in middle Tennessee...

* Until 230 AM CDT.

* At 1207 AM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 3 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...
  Franklin, Ashland City, Nashville, Brentwood, La Vergne, 
  Nolensville, Forest Hills, Oak Hill, Belle Meade, Kingston 
  Springs, Pegram, Bellevue, Antioch, Berry Hill, Bells Bend and 
  Percy Priest Lake.

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 3602 8718 3607 8717 3617 8716 3617 8715
      3618 8715 3629 8714 3617 8657 3609 8655
      3601 8661 3594 8663 3600 8704

FLASH FLOOD...RADAR INDICATED

$$

Barnwell

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 31, 7:03 PM CDT	Severe Thunderstorm Warning	OHX	Robertson	27 min
Jul 31, 7:07 PM CDT	Special Weather Statement	OHX	Robertson	23 min
Jul 31, 7:27 PM CDT	Severe Thunderstorm Warning	OHX	Cheatham, Dickson, Montgomery	20 min
Jul 31, 7:31 PM CDT	Special Weather Statement	OHX	Davidson, Robertson	44 min
Jul 31, 7:41 PM CDT	Special Weather Statement	OHX	Robertson	34 min
Jul 31, 7:51 PM CDT	Special Weather Statement	OHX	Cheatham, Davidson	39 min
Jul 31, 7:58 PM CDT	Severe Thunderstorm Warning	OHX	Davidson, Wilson	47 min
Jul 31, 8:05 PM CDT	Special Weather Statement	OHX	Sumner, Trousdale	40 min
Jul 31, 8:24 PM CDT	Severe Thunderstorm Warning	OHX	Davidson, Williamson	36 min
Jul 31, 8:47 PM CDT	Areal Flood Advisory	OHX	Robertson	4 hr
Jul 31, 8:57 PM CDT	Severe Thunderstorm Warning	OHX	Davidson, Rutherford, Williamson	33 min
Jul 31, 9:10 PM CDT	Severe Thunderstorm Warning	OHX	Houston, Montgomery, Stewart	50 min
Jul 31, 9:16 PM CDT	Special Weather Statement	OHX	Davidson	59 min
Jul 31, 9:48 PM CDT	Special Weather Statement	OHX	Cheatham, Dickson	27 min
Jul 31, 9:53 PM CDT	Areal Flood Advisory	OHX	Cheatham, Davidson, Robertson, Sumner	3 hr
Jul 31, 9:57 PM CDT	Severe Thunderstorm Warning	OHX	Cheatham, Dickson, Hickman, Montgomery, Williamson	33 min
Jul 31, 10:19 PM CDT	Severe Thunderstorm Warning	OHX	Cheatham, Davidson, Marshall, Maury, Williamson	41 min
Jul 31, 10:52 PM CDT	Severe Thunderstorm Warning	OHX	Bedford, Marshall, Maury, Rutherford, Williamson	38 min
Jul 31, 10:55 PM CDT	Areal Flood Advisory	OHX	Davidson, Rutherford, Wilson	16 min
Jul 31, 11:10 PM CDT	Flash Flood Warning	OHX	Davidson, Rutherford, Wilson	3 hr
Jul 31, 11:24 PM CDT	Severe Thunderstorm Warning	OHX	Lewis, Perry, Wayne	36 min
Jul 31, 11:26 PM CDT	Severe Thunderstorm Warning	OHX	Bedford, Cannon, Coffee, Marshall, Rutherford, Warren	34 min
Jul 31, 11:36 PM CDT	River Flood Warning	OHX	Davidson	3 hr
Jul 31, 11:41 PM CDT	River Flood Advisory	OHX	Davidson	3 hr
Jul 31, 11:55 PM CDT	Severe Thunderstorm Warning	OHX	Bedford, Cannon, Coffee, Grundy, Rutherford, Van Buren and 1 more	53 min
Aug 1, 2:40 AM CDT	Special Weather Statement	OHX	Wayne	50 min
Aug 1, 3:43 AM CDT	Special Weather Statement	OHX	Wayne	47 min
Aug 1, 4:29 AM CDT	Special Weather Statement	OHX	Lawrence, Wayne	46 min
Aug 1, 6:47 AM CDT	Special Weather Statement	OHX	Giles, Lawrence	43 min

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.