Alert archive / Tennessee / Flash Flood Warnings in 2021

Flash Flood Warning 63, NWS Nashville, TN

September 20, 20216 counties in Tennessee

NWS Nashville, TN issued this flash flood warning at Sep 20, 2021, 3:25 PM CDT for 6 counties in Tennessee. It was in force for 5 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: Sep 20, 2021, 3:25 PM CDT (20:25 UTC)
Expired: Sep 20, 2021, 8:30 PM CDT
In force: 5 hr
Issued by: NWS Nashville, TN
Area: Storm-based polygon
Flood severity: None

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

The radar

The Nashville radar (KOHX), 71 km from the middle of the area, began a volume at 20:29 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 20, 4:27 PM CDT	FLASH FLOOD	4 E Santa Fe, TN	JACOBS ROAD FLOODED AND IMPASSABLE
Sep 20, 4:30 PM CDT	FLASH FLOOD	6 N Columbia, TN	CARTERS CREEK AT HARLAN RD. IMPASSABLE DUE TO HIGH WATER .
Sep 20, 7:30 PM CDT	FLASH FLOOD	Santa Fe, TN	SEVERAL ROADWAYS IN NORTHERN MAURY COUNTY DAMAGED AND CLOSED DUE TO FLOODING

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, 8.4 hours before the alert went out and 61 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: 323 J/kg
Mixed-layer CIN: -36 J/kg
Mixed-layer LCL: 758 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 149 m²/s²
0-3 km storm-relative helicity: 142 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

501 
WGUS54 KOHX 202025
FFWOHX
TNC021-043-081-101-119-187-202330-
/O.NEW.KOHX.FF.W.0063.210920T2025Z-210920T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Nashville TN
325 PM CDT Mon Sep 20 2021

The National Weather Service in Nashville has issued a

* Flash Flood Warning for...
  South Central Cheatham County in middle Tennessee...
  Southeastern Dickson County in middle Tennessee...
  Eastern Hickman County in middle Tennessee...
  Northeastern Lewis County in middle Tennessee...
  Northwestern Maury County in middle Tennessee...
  Western Williamson County in middle Tennessee...

* Until 630 PM CDT.

* At 325 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 2 and 3.5 inches of 
  rain have fallen. 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...
  Columbia, Hohenwald, Centerville, Mount Pleasant, Kingston 
  Springs, Pegram, Fairview, Primm Springs, Williamsport, Santa Fe, 
  Hampshire, Lyles, Bon Aqua, Gordonsburg, Leipers Fork, Natchez 
  Trace At Highway 96 and Kimmins.

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.

In hilly terrain there are hundreds of low water crossings which are 
potentially dangerous in heavy rain. Do not attempt to cross flooded 
roads. Find an alternate route.

&&

LAT...LON 3581 8747 3597 8736 3611 8709 3606 8704
      3604 8704 3605 8705 3599 8704 3599 8703
      3602 8699 3599 8696 3557 8703 3551 8730
      3551 8755 3557 8757

FLASH FLOOD...RADAR INDICATED

$$

Whitehead

3 follow-up statements

304 
WGUS74 KOHX 202318
FFSOHX

Flash Flood Statement
National Weather Service Nashville TN
618 PM CDT Mon Sep 20 2021

TNC021-043-202328-
/O.CAN.KOHX.FF.W.0063.000000T0000Z-210920T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Cheatham TN-Dickson TN-
618 PM CDT Mon Sep 20 2021

...FLASH FLOOD WARNING IS CANCELLED FOR SOUTH CENTRAL CHEATHAM AND 
SOUTHEASTERN DICKSON 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 for a portion 
of Middle Tennessee.

LAT...LON 3577 8742 3591 8730 3596 8723 3596 8721
      3597 8721 3598 8719 3599 8720 3602 8715
      3604 8709 3605 8705 3599 8704 3602 8699
      3599 8696 3557 8703 3551 8730 3551 8755
      3557 8757

$$

TNC081-101-119-187-202330-
/O.CON.KOHX.FF.W.0063.000000T0000Z-210920T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Hickman TN-Lewis TN-Maury TN-Williamson TN-
618 PM CDT Mon Sep 20 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 630 PM CDT THIS 
EVENING FOR SOUTHEASTERN HICKMAN, NORTHEASTERN LEWIS, NORTHWESTERN 
MAURY AND WESTERN WILLIAMSON COUNTIES...

At 618 PM CDT, Doppler radar indicated thunderstorms producing heavy 
rain across the warned area. Between 2 and 3.5 inches of rain have 
fallen. 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...
  Columbia, Hohenwald, Mount Pleasant, Fairview, Williamsport, Primm 
  Springs, Santa Fe, Hampshire, Gordonsburg, Leipers Fork and 
  Natchez Trace At Highway 96.

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.

In hilly terrain there are hundreds of low water crossings which are 
potentially dangerous in heavy rain. Do not attempt to cross flooded 
roads. Find an alternate route.

&&

LAT...LON 3577 8742 3591 8730 3596 8723 3596 8721
      3597 8721 3598 8719 3599 8720 3602 8715
      3604 8709 3605 8705 3599 8704 3602 8699
      3599 8696 3557 8703 3551 8730 3551 8755
      3557 8757

FLASH FLOOD...RADAR INDICATED

$$

Whitehead

358 
WGUS54 KOHX 202320
FFWOHX
TNC081-101-119-187-210130-
/O.EXT.KOHX.FF.W.0063.000000T0000Z-210921T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Nashville TN
620 PM CDT Mon Sep 20 2021

The National Weather Service in Nashville has extended the

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

* Until 830 PM CDT.

* At 620 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 2 and 4.5 inches of 
  rain have fallen. Additional rainfall amounts up to 1 inch 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...
  Columbia, Hohenwald, Mount Pleasant, Fairview, Williamsport, Primm 
  Springs, Santa Fe, Hampshire, Gordonsburg, Leipers Fork and 
  Natchez Trace At Highway 96.

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.

In hilly terrain there are hundreds of low water crossings which are 
potentially dangerous in heavy rain. Do not attempt to cross flooded 
roads. Find an alternate route.

&&

LAT...LON 3577 8742 3591 8730 3596 8723 3596 8721
      3597 8721 3598 8719 3599 8720 3602 8715
      3604 8709 3605 8705 3599 8704 3602 8699
      3599 8696 3557 8703 3551 8730 3551 8755
      3557 8757

FLASH FLOOD...RADAR INDICATED

$$

Whitehead

581 
WGUS74 KOHX 210005
FFSOHX

Flash Flood Statement
National Weather Service Nashville TN
705 PM CDT Mon Sep 20 2021

TNC081-101-119-187-210130-
/O.CON.KOHX.FF.W.0063.000000T0000Z-210921T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Hickman TN-Lewis TN-Maury TN-Williamson TN-
705 PM CDT Mon Sep 20 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 830 PM CDT THIS 
EVENING FOR SOUTHEASTERN HICKMAN, NORTHEASTERN LEWIS, NORTHWESTERN 
MAURY AND SOUTHWESTERN WILLIAMSON COUNTIES...

At 705 PM CDT, Doppler radar indicated heavy rain across the warned 
area. Between 2 and 4.5 inches of rain have fallen. Flash flooding 
is ongoing or expected to begin shortly.

HAZARD...Flash flooding caused by heavy rain.

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...
  Columbia, Mount Pleasant, Williamsport, Santa Fe, Hampshire, Primm 
  Springs, Gordonsburg and Leipers Fork.

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.

In hilly terrain there are hundreds of low water crossings which are 
potentially dangerous in heavy rain. Do not attempt to cross flooded 
roads. Find an alternate route.

&&

LAT...LON 3586 8727 3587 8716 3590 8701 3590 8698
      3557 8703 3551 8730 3551 8755

FLASH FLOOD...RADAR INDICATED

$$

Whitehead

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 19, 8:09 PM CDT	River Flood Warning	OHX	Bedford, Marshall	40 hr
Sep 20, 6:25 AM CDT	Areal Flood Advisory	OHX	Dickson, Hickman, Lewis, Maury	2 hr
Sep 20, 7:08 AM CDT	Areal Flood Advisory	OHX	Dickson, Montgomery	112 min
Sep 20, 8:29 AM CDT	Areal Flood Advisory	OHX	Cheatham, Davidson, Hickman, Lewis, Marshall, Maury and 1 more	2 hr
Sep 20, 9:53 AM CDT	Areal Flood Advisory	OHX	Bedford, Davidson, Marshall, Rutherford, Williamson	112 min
Sep 20, 10:10 AM CDT	Areal Flood Advisory	OHX	Dickson, Hickman, Lewis, Maury, Williamson	2 hr
Sep 20, 10:25 AM CDT	Flash Flood Warning	OHX	Dickson, Hickman, Lewis, Maury, Williamson	5 hr
Sep 20, 10:32 AM CDT	Areal Flood Advisory	OHX	Davidson, Robertson, Rutherford, Sumner, Williamson, Wilson	118 min
Sep 20, 10:48 AM CDT	Areal Flood Advisory	OHX	Bedford, Rutherford	4 hr
Sep 20, 11:44 AM CDT	Areal Flood Advisory	OHX	Rutherford, Wilson	3 hr
Sep 20, 12:23 PM CDT	Areal Flood Advisory	OHX	Davidson, Rutherford, Sumner, Williamson, Wilson	3 hr
Sep 20, 1:02 PM CDT	Areal Flood Advisory	OHX	Macon, Sumner, Trousdale, Wilson	3 hr
Sep 20, 3:56 PM CDT	Areal Flood Advisory	OHX	Giles, Marshall, Maury, Williamson	2 hr
Sep 20, 4:10 PM CDT	Flash Flood Warning	OHX	Giles, Marshall, Maury, Williamson	3 hr
Sep 20, 4:26 PM CDT	River Flood Advisory	OHX	Hickman	4 hr
Sep 20, 4:34 PM CDT	River Flood Advisory	OHX	Bedford	11 hr
Sep 20, 5:59 PM CDT	Areal Flood Advisory	OHX	Giles, Lawrence, Lewis, Maury, Wayne	3 hr
Sep 20, 6:51 PM CDT	Flash Flood Warning	OHX	Giles, Lawrence, Lewis, Maury, Wayne	114 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.