Alert archive / Tennessee / Flash Flood Warnings in 2021

Flash Flood Warning 32, NWS Nashville, TN

June 12, 2021Marshall County, Maury County, Williamson County, Tennessee

NWS Nashville, TN issued this flash flood warning at Jun 12, 2021, 5:41 PM CDT for Marshall County, Maury County, Williamson County, Tennessee. It was in force for 3 hr. 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: Jun 12, 2021, 5:41 PM CDT (22:41 UTC)
Expired: Jun 12, 2021, 8:45 PM CDT
In force: 3 hr
Issued by: NWS Nashville, TN
Area: Storm-based polygon
Flood severity: None

Counties Marshall County, TN, Maury County, TN, Williamson County, TN

The radar

The Nashville radar (KOHX), 68 km from the middle of the area, began a volume at 22:42 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
Jun 12, 6:00 PM CDT	FLASH FLOOD	4 S Lewisburg, TN	WATER FLOWING OVER A PORTION OF COOSIE BRANCH RD. NEAR THE 700 BLOCK.

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, 10.7 hours before the alert went out and 54 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: 1463 J/kg
Mixed-layer CIN: -47 J/kg
Mixed-layer LCL: 1034 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 97 m²/s²
0-3 km storm-relative helicity: 131 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.5

Open this sounding in Storm Lab

The text

As transmitted.

358 
WGUS54 KOHX 122241
FFWOHX
TNC117-119-187-130145-
/O.NEW.KOHX.FF.W.0032.210612T2241Z-210613T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Nashville TN
541 PM CDT Sat Jun 12 2021

The National Weather Service in Nashville has issued a

* Flash Flood Warning for...
  Central Marshall County in middle Tennessee...
  Southeastern Maury County in middle Tennessee...
  South Central Williamson County in middle Tennessee...

* Until 845 PM CDT.

* At 541 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...Doppler radar.

  IMPACT...Flooding of small creeks and streams, urban areas,
           highways, streets and underpasses as well as other
           drainage and low lying areas.

* Some locations that will experience flash flooding include...
  Lewisburg, Chapel Hill, Cornersville and Farmington.

Additional rainfall amounts of 1 to 2 inches are possible in the 
warned area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

A Flash Flood Warning means that flooding is imminent or occurring. 
If you are in the warned area move to higher ground immediately. 
Residents living along streams and creeks should take immediate 
precautions to protect life and property.

&&

LAT...LON 3575 8685 3575 8668 3574 8670 3572 8670
      3572 8669 3571 8669 3571 8668 3535 8671
      3536 8691

FLASH FLOOD...RADAR INDICATED

$$

Barnwell

1 follow-up statement

098 
WGUS74 KOHX 130036
FFSOHX

Flash Flood Statement
National Weather Service Nashville TN
736 PM CDT Sat Jun 12 2021

TNC119-187-130046-
/O.CAN.KOHX.FF.W.0032.000000T0000Z-210613T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Maury TN-Williamson TN-
736 PM CDT Sat Jun 12 2021

...FLASH FLOOD WARNING IS CANCELLED FOR SOUTHEASTERN MAURY AND SOUTH 
CENTRAL WILLIAMSON COUNTIES...

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

LAT...LON 3571 8668 3535 8671 3536 8691 3547 8689
      3552 8688 3550 8687 3554 8684 3557 8684
      3558 8683 3558 8684 3559 8684 3561 8682
      3570 8681 3569 8680 3571 8678 3571 8676
      3570 8675 3571 8674 3570 8674 3571 8673

$$

TNC117-130145-
/O.CON.KOHX.FF.W.0032.000000T0000Z-210613T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Marshall TN-
736 PM CDT Sat Jun 12 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 845 PM CDT THIS 
EVENING FOR CENTRAL MARSHALL COUNTY...

At 736 PM 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...Doppler radar.

IMPACT...Flooding of small creeks and streams, urban areas,
         highways, streets and underpasses as well as other
         drainage and low lying areas.

Some locations that will experience flash flooding include...
  Lewisburg, Chapel Hill, Cornersville and Farmington.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

A Flash Flood Warning means that flooding is imminent or occurring. 
If you are in the warned area move to higher ground immediately. 
Residents living along streams and creeks should take immediate 
precautions to protect life and property.

&&

LAT...LON 3571 8668 3535 8671 3536 8691 3547 8689
      3552 8688 3550 8687 3554 8684 3557 8684
      3558 8683 3558 8684 3559 8684 3561 8682
      3570 8681 3569 8680 3571 8678 3571 8676
      3570 8675 3571 8674 3570 8674 3571 8673

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
Jun 11, 7:08 PM CDT	Flash Flood Warning	OHX	Rutherford	112 min
Jun 11, 7:55 PM CDT	Special Weather Statement	OHX	Hickman	50 min
Jun 11, 8:39 PM CDT	Areal Flood Advisory	OHX	Clay, Fentress, Jackson, Overton, Pickett, Putnam	3 hr
Jun 11, 8:43 PM CDT	Special Weather Statement	OHX	Fentress, Overton, Pickett	62 min
Jun 11, 10:15 PM CDT	Special Weather Statement	OHX	Sumner, Trousdale	45 min
Jun 12, 12:26 PM CDT	Special Weather Statement	OHX	Bedford	19 min
Jun 12, 2:41 PM CDT	Special Weather Statement	OHX	Giles	49 min
Jun 12, 2:50 PM CDT	Severe Thunderstorm Warning	OHX	Giles, Marshall	25 min
Jun 12, 3:02 PM CDT	Special Weather Statement	OHX	Humphreys	43 min
Jun 12, 3:10 PM CDT	Areal Flood Advisory	OHX	Giles, Marshall	2 hr
Jun 12, 3:15 PM CDT	Special Weather Statement	OHX	Giles	60 min
Jun 12, 3:27 PM CDT	Special Weather Statement	OHX	Marshall	48 min
Jun 12, 3:29 PM CDT	Special Weather Statement	OHX	Wayne	46 min
Jun 12, 4:14 PM CDT	Special Weather Statement	OHX	Wayne	61 min
Jun 12, 4:15 PM CDT	Special Weather Statement	OHX	Giles, Marshall	60 min
Jun 12, 4:17 PM CDT	Areal Flood Advisory	OHX	Giles, Marshall, Maury, Williamson	3 hr
Jun 12, 4:42 PM CDT	Special Weather Statement	OHX	Giles, Lawrence	33 min
Jun 12, 5:08 PM CDT	Special Weather Statement	OHX	Fentress, Pickett	52 min
Jun 12, 5:12 PM CDT	Special Weather Statement	OHX	Giles	48 min
Jun 12, 5:12 PM CDT	Special Weather Statement	OHX	Wayne	63 min
Jun 12, 5:42 PM CDT	Special Weather Statement	OHX	Marshall	48 min
Jun 12, 5:54 PM CDT	Special Weather Statement	OHX	Cumberland, Fentress	66 min
Jun 12, 6:41 PM CDT	Special Weather Statement	OHX	Dickson	49 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.