Alert archive / Tennessee / Flash Flood Warnings in 2021

Flash Flood Warning 44, NWS Nashville, TN

July 31, 2021Davidson County, Rutherford County, Wilson County, Tennessee

NWS Nashville, TN issued this flash flood warning at Jul 31, 2021, 11:10 PM CDT for Davidson County, Rutherford County, Wilson County, Tennessee. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 31, 2021, 11:10 PM CDT (04:10 UTC)
Expired: Aug 1, 2021, 2:00 AM CDT
In force: 3 hr
Issued by: NWS Nashville, TN
Area: Storm-based polygon
Flood severity: None

Counties Davidson County, TN, Rutherford County, TN, Wilson County, TN

The radar

The Nashville radar (KOHX), 26 km from the middle of the area, began a volume at 04:13 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.

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 00:00Z, 4.2 hours before the alert went out and 15 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.

761 
WGUS54 KOHX 010410
FFWOHX
TNC037-149-189-010700-
/O.NEW.KOHX.FF.W.0044.210801T0410Z-210801T0700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Nashville TN
1110 PM CDT Sat Jul 31 2021

The National Weather Service in Nashville has issued a

* Flash Flood Warning for...
  Southeastern Davidson County in middle Tennessee...
  Northern Rutherford County in middle Tennessee...
  Southwestern Wilson County in middle Tennessee...

* Until 200 AM CDT.

* At 1110 PM 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...
  Murfreesboro, Lebanon, Smyrna, La Vergne, Mount Juliet, 
  Nolensville, Walterhill, Rural Hill, Belinda City, Gladeville, 
  Cedars Of Lebanon State Park, Lascassas, Milton and Green Hill.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3597 8662 3601 8661 3609 8655 3617 8657
      3622 8658 3622 8638 3595 8616 3583 8619
      3594 8662 3594 8661 3595 8662 3596 8662

FLASH FLOOD...RADAR INDICATED

$$

Shamburger

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, 10:24 PM CDT	Flash Flood Warning	OHX	Cheatham, Davidson, Williamson	4 hr
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, 11:24 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.