Alert archive / Tennessee / Flash Flood Warnings in 2021

Flash Flood Warning 59, NWS Nashville, TN

September 15, 20216 counties in Tennessee

NWS Nashville, TN issued this flash flood warning at Sep 15, 2021, 9:33 AM CDT for 6 counties in Tennessee. It was in force for 117 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 15, 2021, 9:33 AM CDT (14:33 UTC)
Expired: Sep 15, 2021, 11:30 AM CDT
In force: 117 min
Issued by: NWS Nashville, TN
Area: Storm-based polygon
Flood severity: None

Counties Dickson County, TN, Hickman County, TN, Lewis County, TN, Maury County, TN, Perry County, TN, Williamson County, TN

The radar

The Nashville radar (KOHX), 136 km from the middle of the area, began a volume at 14:36 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 15, 9:35 AM CDT	FLASH FLOOD	Linden, TN	SEVERAL ROADS WERE FLOODED IN AND AROUND LINDEN INCLUDING SOUTH MILL STREET..BRUSH CREEK ROAD..AND SPOTS ON HIGHWAY 13.

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 12:00Z, 2.6 hours before the alert went out and 127 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: 843 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 585 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: -27 m²/s²
0-3 km storm-relative helicity: 18 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

077 
WGUS54 KOHX 151433
FFWOHX
TNC043-081-101-119-135-187-151630-
/O.NEW.KOHX.FF.W.0059.210915T1433Z-210915T1630Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Nashville TN
933 AM CDT Wed Sep 15 2021

The National Weather Service in Nashville has issued a

* Flash Flood Warning for...
  Southeastern Dickson County in middle Tennessee...
  Hickman County in middle Tennessee...
  Northwestern Lewis County in middle Tennessee...
  Northwestern Maury County in middle Tennessee...
  Perry County in middle Tennessee...
  Northwestern Williamson County in middle Tennessee...

* Until 1130 AM CDT.

* At 933 AM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 3.5 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...
  Hohenwald, Centerville, Linden, Lobelville, Kimmins, 
  Pleasantville, Nunnelly, Pinewood, Lyles, Bon Aqua, Primm Springs, 
  Flatwoods and Mousetail Landing State Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be aware of your surroundings and do not drive on flooded roads.

&&

LAT...LON 3572 8803 3605 8718 3596 8711 3580 8710
      3548 8770 3549 8774 3547 8785 3548 8786
      3546 8792 3546 8797 3543 8801 3542 8801
      3543 8803 3545 8804 3547 8803 3548 8799
      3551 8797 3562 8804 3568 8802

FLASH FLOOD...RADAR INDICATED

$$

Barnwell

1 follow-up statement

869 
WGUS74 KOHX 151552
FFSOHX

Flash Flood Statement
National Weather Service Nashville TN
1052 AM CDT Wed Sep 15 2021

TNC101-119-187-151602-
/O.CAN.KOHX.FF.W.0059.000000T0000Z-210915T1630Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Lewis TN-Maury TN-Williamson TN-
1052 AM CDT Wed Sep 15 2021

...FLASH FLOOD WARNING IS CANCELLED FOR NORTHWESTERN LEWIS, 
NORTHWESTERN MAURY AND NORTHWESTERN WILLIAMSON COUNTIES...

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

A Flash Flood Watch remains in effect until 700 PM CDT Wednesday for 
a portion of Middle Tennessee.

LAT...LON 3572 8803 3605 8718 3598 8719 3597 8721
      3594 8720 3573 8723 3562 8745 3565 8759
      3561 8766 3556 8765 3555 8769 3551 8769
      3548 8772 3548 8786 3543 8803 3547 8803
      3548 8799 3551 8797 3562 8804 3568 8802

$$

TNC043-081-135-151630-
/O.CON.KOHX.FF.W.0059.000000T0000Z-210915T1630Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Dickson TN-Hickman TN-Perry TN-
1052 AM CDT Wed Sep 15 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1130 AM CDT THIS 
MORNING FOR SOUTHEASTERN DICKSON, HICKMAN AND PERRY COUNTIES...

At 1052 AM CDT, Doppler radar indicated thunderstorms producing 
heavy rain across the warned area. Between 1 and 4 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...
  Centerville, Linden, Lobelville, Pleasantville, Nunnelly, 
  Pinewood, Lyles, Bon Aqua, Primm Springs and Mousetail Landing 
  State Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be aware of your surroundings and do not drive on flooded roads.

&&

LAT...LON 3572 8803 3605 8718 3598 8719 3597 8721
      3594 8720 3573 8723 3562 8745 3565 8759
      3561 8766 3556 8765 3555 8769 3551 8769
      3548 8772 3548 8786 3543 8803 3547 8803
      3548 8799 3551 8797 3562 8804 3568 8802

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
Sep 15, 5:55 AM CDT	Flash Flood Watch	OHX	Cheatham, Clay, Davidson, Dickson, Giles, Hickman and 19 more	10 hr
Sep 15, 8:23 AM CDT	Areal Flood Advisory	OHX	Dickson, Hickman, Lewis, Maury, Perry, Williamson	4 hr
Sep 15, 10:08 AM CDT	Areal Flood Advisory	OHX	Cheatham, Davidson, Dickson, Robertson, Sumner	3 hr
Sep 15, 2:20 PM CDT	Areal Flood Advisory	OHX	Clay, Jackson, Macon, Overton, Pickett, Putnam and 2 more	3 hr
Sep 15, 2:57 PM CDT	Areal Flood Advisory	OHX	DeKalb, Jackson, Putnam, Smith, White	2 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.