Alert archive / Tennessee / Flash Flood Warnings in 2021

Flash Flood Warning 45, NWS Nashville, TN

August 13, 2021Hickman County, Humphreys County, Perry County, Tennessee

NWS Nashville, TN issued this flash flood warning at Aug 13, 2021, 3:28 PM CDT for Hickman County, Humphreys County, Perry County, Tennessee. It was in force for 2 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: Aug 13, 2021, 3:28 PM CDT (20:28 UTC)
Expired: Aug 13, 2021, 5:30 PM CDT
In force: 2 hr
Issued by: NWS Nashville, TN
Area: Storm-based polygon
Flood severity: None

Counties Hickman County, TN, Humphreys County, TN, Perry County, TN

The radar

The Ft Campbell radar (KHPX), 121 km from the middle of the area, began a volume at 20:31 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 12:00Z, 8.5 hours before the alert went out and 125 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: 1072 J/kg
Mixed-layer CIN: -119 J/kg
Mixed-layer LCL: 1013 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: 43 m²/s²
0-3 km storm-relative helicity: 54 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

137 
WGUS54 KOHX 132028
FFWOHX
TNC081-085-135-132230-
/O.NEW.KOHX.FF.W.0045.210813T2028Z-210813T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Nashville TN
328 PM CDT Fri Aug 13 2021

The National Weather Service in Nashville has issued a

* Flash Flood Warning for...
  Western Hickman County in middle Tennessee...
  Southern Humphreys County in middle Tennessee...
  Northern Perry County in middle Tennessee...

* Until 530 PM CDT.

* At 328 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...
  Lobelville, Bucksnort, Pleasantville, I-40 Near The Tennessee 
  River, Pinewood and Mousetail Landing State Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3588 8794 3594 8793 3597 8752 3569 8754
      3560 8803 3562 8804 3568 8802 3570 8803
      3572 8803 3576 8799 3578 8798 3583 8797

FLASH FLOOD...RADAR INDICATED

$$

13

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 13, 12:16 PM CDT	Special Weather Statement	OHX	Marshall	44 min
Aug 13, 12:37 PM CDT	Special Weather Statement	OHX	Giles	53 min
Aug 13, 12:57 PM CDT	Special Weather Statement	OHX	Rutherford	48 min
Aug 13, 1:05 PM CDT	Severe Thunderstorm Warning	OHX	Rutherford	25 min
Aug 13, 1:20 PM CDT	Special Weather Statement	OHX	Williamson	25 min
Aug 13, 1:31 PM CDT	Special Weather Statement	OHX	Wilson	29 min
Aug 13, 1:40 PM CDT	Special Weather Statement	OHX	Williamson	50 min
Aug 13, 2:03 PM CDT	Areal Flood Advisory	OHX	Williamson	117 min
Aug 13, 2:38 PM CDT	Areal Flood Advisory	OHX	Lawrence, Wayne	2 hr
Aug 13, 2:47 PM CDT	Areal Flood Advisory	OHX	Davidson	118 min
Aug 13, 2:51 PM CDT	Severe Thunderstorm Warning	OHX	Cheatham, Dickson, Hickman, Williamson	39 min
Aug 13, 2:53 PM CDT	Areal Flood Advisory	OHX	Hickman, Humphreys, Perry	2 hr
Aug 13, 2:56 PM CDT	Areal Flood Advisory	OHX	Dickson, Hickman, Williamson	2 hr
Aug 13, 3:24 PM CDT	Special Weather Statement	OHX	Hickman, Lewis, Perry	51 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.