Alert archive / Tennessee / Flash Flood Warnings in 2020

Flash Flood Warning 9, NWS Nashville, TN

March 24, 20206 counties in Tennessee

NWS Nashville, TN issued this flash flood warning at Mar 24, 2020, 6:14 PM CDT for 6 counties in Tennessee. It was in force for 91 min. 2 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: Mar 24, 2020, 6:14 PM CDT (23:14 UTC)
Expired: Mar 24, 2020, 7:45 PM CDT
In force: 91 min
Issued by: NWS Nashville, TN
Area: Storm-based polygon
Flood severity: None

Counties Davidson County, TN, Macon County, TN, Smith County, TN, Sumner County, TN, Trousdale County, TN, Wilson County, TN

The radar

The Nashville radar (KOHX), 41 km from the middle of the area, began a volume at 23:14 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
Mar 24, 6:45 PM CDT	FLASH FLOOD	7 Ssw Hartsville, TN	BEASLEYS BEND ROAD WAS FLOODED
Mar 24, 7:00 PM CDT	FLASH FLOOD	7 N Carthage, TN	TRUCK WASHED OFF PLEASANT SHADE HIGHWAY INTO TREES ALONG PEYTON CREEK

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, 11.2 hours before the alert went out and 51 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 862 m above ground
0-6 km bulk shear: 60 kt
0-1 km storm-relative helicity: 14 m²/s²
0-3 km storm-relative helicity: 86 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

377 
WGUS54 KOHX 242314
FFWOHX
TNC037-111-159-165-169-189-250045-
/O.NEW.KOHX.FF.W.0009.200324T2314Z-200325T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Nashville TN
614 PM CDT Tue Mar 24 2020

The National Weather Service in Nashville has issued a

* Flash Flood Warning for...
  Northwestern Smith County in Middle Tennessee...
  Northeastern Davidson County in Middle Tennessee...
  Southern Sumner County in Middle Tennessee...
  Northern Wilson County in Middle Tennessee...
  Macon County in Middle Tennessee...
  Trousdale County in Middle Tennessee...

* Until 745 PM CDT.

* At 614 PM CDT, Doppler radar indicated thunderstorms producing
  heavy rain across the warned area. Up to two inches of rain have
  already fallen. Flash flooding is ongoing or expected to begin
  shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar indicated.

  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 flooding include...
  Gallatin, Lebanon, Lafayette, Hartsville, Hendersonville, Mount
  Juliet, Goodlettsville, Lakewood, Westmoreland, Hermitage, Belinda
  City, and Old Hickory.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3662 8588 3633 8590 3609 8669 3636 8670
      3663 8603

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
Mar 24, 3:12 AM CDT	Flash Flood Watch	OHX	Bedford, Coffee, Giles, Grundy, Lawrence, Lewis and 5 more	19 hr
Mar 24, 7:24 AM CDT	River Flood Advisory	OHX	Decatur, Hardin, Perry, Wayne	24 hr
Mar 24, 7:33 AM CDT	River Flood Advisory	OHX	Giles	65 hr
Mar 24, 8:37 AM CDT	Areal Flood Advisory	OHX	Giles, Lawrence, Wayne	3 hr
Mar 24, 9:14 AM CDT	River Flood Advisory	OHX	Perry	67 hr
Mar 24, 3:21 PM CDT	River Flood Advisory	OHX	Davidson	4 days
Mar 24, 3:26 PM CDT	River Flood Advisory	OHX	Hickman	22 hr
Mar 24, 4:50 PM CDT	Special Weather Statement	OHX	Lewis, Wayne	25 min
Mar 24, 4:57 PM CDT	Severe Thunderstorm Warning	OHX	Lawrence, Lewis, Wayne	33 min
Mar 24, 5:27 PM CDT	Tornado Warning	OHX	Giles, Lawrence	33 min
Mar 24, 5:39 PM CDT	Areal Flood Advisory	OHX	Clay, Jackson, Macon, Overton, Pickett, Smith and 3 more	3 hr
Mar 24, 5:42 PM CDT	Areal Flood Advisory	OHX	Bedford, Giles, Lawrence, Lewis, Marshall, Maury and 1 more	3 hr
Mar 24, 5:49 PM CDT	Areal Flood Advisory	OHX	Davidson, Rutherford, Sumner, Williamson, Wilson	3 hr
Mar 24, 5:52 PM CDT	Flash Flood Warning	OHX	Giles, Lawrence, Marshall, Maury	83 min
Mar 24, 6:00 PM CDT	Severe Thunderstorm Warning	OHX	Giles, Marshall	30 min

Nearby

Flash Flood Warnings in Tennessee, 2020 Every flash flood warning in 2020

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.