Alert archive / Tennessee / Flash Flood Warnings in 2021

Flash Flood Warning 47, NWS Nashville, TN

August 18, 2021Lawrence County, Wayne County, Tennessee

NWS Nashville, TN issued this flash flood warning at Aug 18, 2021, 5:13 PM CDT for Lawrence County, Wayne 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: Aug 18, 2021, 5:13 PM CDT (22:13 UTC)
Expired: Aug 18, 2021, 8:15 PM CDT
In force: 3 hr
Issued by: NWS Nashville, TN
Area: Storm-based polygon
Flood severity: None

Counties Lawrence County, TN, Wayne County, TN

The radar

The Columbus AFB radar (KGWX), 153 km from the middle of the area, began a volume at 22:16 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, 10.2 hours before the alert went out and 147 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: 259 J/kg
Mixed-layer CIN: -49 J/kg
Mixed-layer LCL: 919 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 70 m²/s²
0-3 km storm-relative helicity: 72 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

967 
WGUS54 KOHX 182213
FFWOHX
TNC099-181-190115-
/O.NEW.KOHX.FF.W.0047.210818T2213Z-210819T0115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Nashville TN
513 PM CDT Wed Aug 18 2021

The National Weather Service in Nashville has issued a

* Flash Flood Warning for...
  Southern Lawrence County in middle Tennessee...
  Southern Wayne County in middle Tennessee...

* Until 815 PM CDT.

* At 513 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across 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...
  Lawrenceburg, Loretto, Collinwood, St. Joseph, Westpoint, Iron 
  City, Cypress Inn, Leoma and Lutts.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3526 8798 3528 8797 3528 8723 3500 8728
      3501 8799

FLASH FLOOD...RADAR INDICATED

$$

13

1 follow-up statement

957 
WGUS74 KOHX 182325
FFSOHX

Flash Flood Statement
National Weather Service Nashville TN
625 PM CDT Wed Aug 18 2021

TNC181-182335-
/O.CAN.KOHX.FF.W.0047.000000T0000Z-210819T0115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Wayne TN-
625 PM CDT Wed Aug 18 2021

...FLASH FLOOD WARNING IS CANCELLED FOR SOUTHERN WAYNE COUNTY...

Flooding is no longer expected to pose a threat. Please continue to 
heed remaining road closures.

LAT...LON 3528 8756 3528 8723 3500 8728 3500 8737
      3500 8739 3500 8740 3500 8743 3500 8746
      3500 8754 3523 8755

$$

TNC099-190115-
/O.CON.KOHX.FF.W.0047.000000T0000Z-210819T0115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Lawrence TN-
625 PM CDT Wed Aug 18 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 815 PM CDT THIS 
EVENING FOR SOUTHERN LAWRENCE COUNTY...

At 625 PM CDT, Doppler radar indicated thunderstorms producing heavy 
rain across 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...
  Lawrenceburg, Loretto, St. Joseph, Leoma and Westpoint.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3528 8756 3528 8723 3500 8728 3500 8737
      3500 8739 3500 8740 3500 8743 3500 8746
      3500 8754 3523 8755

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 18, 12:06 PM CDT	Special Weather Statement	OHX	Wilson	39 min
Aug 18, 1:52 PM CDT	Special Weather Statement	OHX	Wilson	38 min
Aug 18, 2:24 PM CDT	Areal Flood Advisory	OHX	Davidson, Sumner, Wilson	2 hr
Aug 18, 2:33 PM CDT	Flash Flood Warning	OHX	Davidson, Sumner, Wilson	117 min
Aug 18, 2:59 PM CDT	Special Weather Statement	OHX	Sumner	31 min
Aug 18, 3:38 PM CDT	Special Weather Statement	OHX	Lewis	52 min
Aug 18, 3:40 PM CDT	Special Weather Statement	OHX	Cheatham	35 min
Aug 18, 3:57 PM CDT	Special Weather Statement	OHX	Robertson	48 min
Aug 18, 3:58 PM CDT	Special Weather Statement	OHX	Dickson	47 min
Aug 18, 4:00 PM CDT	Areal Flood Advisory	OHX	Cheatham, Davidson, Dickson, Montgomery, Robertson	3 hr
Aug 18, 4:02 PM CDT	Areal Flood Advisory	OHX	Lawrence, Lewis, Perry, Wayne	3 hr
Aug 18, 4:16 PM CDT	Special Weather Statement	OHX	Lewis	44 min
Aug 18, 4:24 PM CDT	Special Weather Statement	OHX	Montgomery, Robertson	51 min
Aug 18, 4:25 PM CDT	Special Weather Statement	OHX	Overton	50 min
Aug 18, 4:43 PM CDT	Areal Flood Advisory	OHX	Fentress, Overton, Putnam	2 hr
Aug 18, 4:52 PM CDT	Special Weather Statement	OHX	Maury	53 min
Aug 18, 5:27 PM CDT	Areal Flood Advisory	OHX	Fentress	2 hr
Aug 18, 5:41 PM CDT	Special Weather Statement	OHX	Davidson, Maury, Williamson	49 min
Aug 18, 6:08 PM CDT	Areal Flood Advisory	OHX	Bedford, Davidson, Marshall, Maury, Rutherford, Williamson	112 min
Aug 18, 6:15 PM CDT	Special Weather Statement	OHX	Giles	45 min
Aug 18, 6:17 PM CDT	Areal Flood Advisory	OHX	Giles, Lawrence, Marshall	58 min
Aug 18, 6:28 PM CDT	Severe Thunderstorm Warning	OHX	Davidson, Rutherford, Williamson	32 min
Aug 18, 6:48 PM CDT	Special Weather Statement	OHX	Wilson	42 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.