Alert archive / Tennessee / Flash Flood Warnings in 2023

Flash Flood Warning 12, NWS Nashville, TN

July 20, 20234 counties in Tennessee

NWS Nashville, TN issued this flash flood warning at Jul 20, 2023, 2:30 PM CDT for 4 counties in 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: Jul 20, 2023, 2:30 PM CDT (19:30 UTC)
Expired: Jul 20, 2023, 5:30 PM CDT
In force: 3 hr
Issued by: NWS Nashville, TN
Area: Storm-based polygon
Flood severity: None

Counties Cannon County, TN, DeKalb County, TN, Van Buren County, TN, Warren County, TN

The radar

The Nashville radar (KOHX), 98 km from the middle of the area, began a volume at 19:31 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this flash flood warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 7.5 hours before the alert went out and 95 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: 1793 J/kg
Mixed-layer CIN: -62 J/kg
Mixed-layer LCL: 782 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 304 m²/s²
0-3 km storm-relative helicity: 309 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 11.4

Open this sounding in Storm Lab

The text

As transmitted.

064 
WGUS54 KOHX 201930
FFWOHX
TNC015-041-175-177-202230-
/O.NEW.KOHX.FF.W.0012.230720T1930Z-230720T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Nashville TN
230 PM CDT Thu Jul 20 2023

The National Weather Service in Nashville has issued a

* Flash Flood Warning for...
  East Central Cannon County in middle Tennessee...
  South Central De Kalb County in middle Tennessee...
  Van Buren County in middle Tennessee...
  Warren County in middle Tennessee...

* Until 530 PM CDT.

* At 230 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...
  McMinnville, Smithville, Spencer and Rock Island State Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3582 8597 3599 8585 3585 8569 3583 8565
      3583 8568 3582 8567 3580 8561 3579 8560
      3581 8560 3580 8559 3569 8529 3557 8542
      3555 8546 3553 8563 3560 8577

FLASH FLOOD...RADAR INDICATED

$$

LaRosa

What forecasters said that day

The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Nashville, TN wrote its last area forecast discussion before this flash flood warning went out at Jul 20, 1:46 PM CDT, 44 minutes earlier.

Area forecast discussion, Jul 20, 1:46 PM CDT, 44 minutes before

Area Forecast Discussion
National Weather Service Nashville TN
146 PM CDT Thu Jul 20 2023

...New SHORT TERM, LONG TERM...

.SHORT TERM...
(This afternoon through Friday Night)
Issued at 134 PM CDT Thu Jul 20 2023

A cluster of severe storms is currently racing across Middle
Tennessee, producing widespread wind damage and power outages,
while we're also experiencing an ongoing flooding threat.
Fortunately, once these storms exit the mid state, it will bring
an end to the worst of the days-long storms and heavy rain we have
experienced this week. Lesser storm chances will continue tonight
and tomorrow before ending altogether tomorrow night as a surface
boundary dips south of the region.

&&

.LONG TERM...
(Saturday through next Thursday)
Issued at 134 PM CDT Thu Jul 20 2023

Drier, cooler air will finally settle over Middle Tennessee to
start off the weekend, and rain chances from Saturday through next
week will be hard to come by, which will be welcome given the
volume of rain that we've received this week. Temperatures this
weekend will be several degrees cooler than normal, but look for
readings to creep back up by the start of next week. By the middle
of the week, we can look forward to highs in the low to mid 90s
most areas, but dew points won't be excessive, so for now it
doesn't appear that any sort of heat advisory will be in play.

&&

.AVIATION...
(18Z TAFS)
Issued at 1220 PM CDT Thu Jul 20 2023

A cluster of severe thunderstorms is bearing down on the Nashville
Metro Area, so the first order of business with the 18Z TAF's is
to move these storms across Middle Tennessee. These storms do
contain severe wind gusts, although the storm core(s) will likely
stay north of BNA. We do expect a cessation of the active weather
behind this line. Look for dense fog to develop overnight, along
with low stratus in a few spots.

&&

.PRELIMINARY POINT TEMPS/POPS...
Nashville      74  88  66  84 /  40  30  20  10
Clarksville    73  87  64  85 /  30  30  10   0
Crossville     67  82  61  77 /  60  50  20  10
Columbia       72  88  65  83 /  50  50  30  10
Cookeville     70  84  63  79 /  60  40  10  10
Jamestown      68  81  62  77 /  60  30  10  10
Lawrenceburg   72  88  64  82 /  60  50  40  10
Murfreesboro   72  88  65  84 /  40  40  20  10
Waverly        71  86  63  83 /  40  40  30  10

&&

.OHX WATCHES/WARNINGS/ADVISORIES...
Flood Watch until 6 PM CDT this evening for Cannon-Cheatham-Clay-
Cumberland-Davidson-De Kalb-Dickson-Fentress-Houston-Humphreys-
Jackson-Macon-Montgomery-Overton-Pickett-Putnam-Robertson-
Rutherford-Smith-Stewart-Sumner-Trousdale-Van Buren-Warren-White-
Williamson-Wilson.

&&

SHORT TERM...Rose
LONG TERM....Rose
AVIATION.....Rose

In the hours before

Local storm report, Jul 20, 2:14 PM CDT, 16 minutes before

Preliminary Local Storm Report
National Weather Service Nashville TN
214 PM CDT Thu Jul 20 2023

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0133 PM     Tstm Wnd Dmg     5 WNW Readyville        35.85N 86.26W
07/20/2023                   Rutherford         TN   Trained Spotter

            Large tree down blocking Cranor Road.

&&

Shamburger

Local storm report, Jul 20, 2:16 PM CDT, 14 minutes before

Preliminary Local Storm Report
National Weather Service Nashville TN
216 PM CDT Thu Jul 20 2023

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0153 PM     Tstm Wnd Dmg     6 W Centertown          35.73N 86.03W
07/20/2023                   Cannon             TN   Public

            Trees down on Red Hill Rd.

&&

Shamburger

Local storm report, Jul 20, 2:20 PM CDT, 10 minutes before

Preliminary Local Storm Report
National Weather Service Nashville TN
220 PM CDT Thu Jul 20 2023

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0115 PM     Tstm Wnd Gst     2 E Gallatin            36.38N 86.41W
07/20/2023  M56 MPH          Sumner             TN   AWOS

            AWOS station KXNX Gallatin Airport.

&&

Shamburger

Local storm report, Jul 20, 2:22 PM CDT, 8 minutes before

Preliminary Local Storm Report
National Weather Service Nashville TN
222 PM CDT Thu Jul 20 2023

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0100 PM     Tstm Wnd Dmg     Gallatin                36.38N 86.45W
07/20/2023                   Sumner             TN   Public

            Social media photos of numerous trees down
            around Gallatin with some blocking roads.

&&

Shamburger

Local storm report, Jul 20, 2:24 PM CDT, 6 minutes before

Preliminary Local Storm Report
National Weather Service Nashville TN
224 PM CDT Thu Jul 20 2023

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0125 PM     Tstm Wnd Dmg     7 WSW Belle Meade       36.04N 86.96W
07/20/2023                   Davidson           TN   Public

            Tspotter photo of large tree down blocking
            Hwy 100 at Old Harding Pike.

&&

Shamburger

Local storm report, Jul 20, 2:29 PM CDT, 1 minute before

Preliminary Local Storm Report
National Weather Service Nashville TN
229 PM CDT Thu Jul 20 2023

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1234 PM     Tstm Wnd Dmg     Springfield             36.50N 86.88W
07/20/2023                   Robertson          TN   Newspaper

            Trees and power lines down throughout
            Robertson County with many across roads.

&&

Shamburger

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 20, 5:44 AM CDT	Special Weather Statement	OHX	Jackson, Smith	31 min
Jul 20, 5:57 AM CDT	Areal Flood Advisory	OHX	Clay, Fentress, Jackson, Macon, Overton, Pickett and 1 more	3 hr
Jul 20, 7:10 AM CDT	Areal Flood Advisory	OHX	Fentress, Jackson, Overton, Putnam	3 hr
Jul 20, 7:58 AM CDT	Areal Flood Advisory	OHX	Cumberland, Fentress, Putnam	3 hr
Jul 20, 8:18 AM CDT	Flash Flood Warning	OHX	Clay, Fentress, Jackson, Overton, Pickett	4 hr
Jul 20, 9:25 AM CDT	Flash Flood Warning	OHX	Fentress	3 hr
Jul 20, 10:47 AM CDT	Flash Flood Warning	OHX	Cumberland, Fentress, Overton, Putnam, White	5 hr
Jul 20, 11:35 AM CDT	Special Weather Statement	OHX	Sumner	25 min
Jul 20, 11:50 AM CDT	Severe Thunderstorm Warning	OHX	Houston, Humphreys, Montgomery, Stewart	40 min
Jul 20, 12:04 PM CDT	Flash Flood Warning Considerable damage threat	OHX	Fentress, Overton, Pickett	6 hr
Jul 20, 12:11 PM CDT	Severe Thunderstorm Warning	OHX	Cheatham, Montgomery, Robertson	34 min
Jul 20, 12:36 PM CDT	Severe Thunderstorm Warning Considerable damage threat	OHX	Cheatham, Davidson, Robertson, Sumner, Wilson	39 min
Jul 20, 12:41 PM CDT	Severe Thunderstorm Warning Destructive damage threat	OHX	Davidson, Robertson, Sumner, Wilson	34 min
Jul 20, 12:51 PM CDT	Severe Thunderstorm Warning	OHX	Cheatham, Davidson, Dickson, Hickman, Montgomery, Robertson	39 min
Jul 20, 1:06 PM CDT	Areal Flood Advisory	OHX	Cheatham, Davidson, Montgomery, Robertson, Sumner	54 min
Jul 20, 1:11 PM CDT	Severe Thunderstorm Warning Destructive damage threat	OHX	Davidson, Rutherford, Smith, Sumner, Trousdale, Wilson	49 min
Jul 20, 1:29 PM CDT	Special Weather Statement	OHX	Bedford, Coffee	46 min
Jul 20, 1:35 PM CDT	Severe Thunderstorm Warning Considerable damage threat	OHX	Cannon, Coffee, DeKalb, Putnam, Rutherford, Smith and 3 more	40 min
Jul 20, 1:44 PM CDT	Severe Thunderstorm Warning	OHX	Bedford, Coffee, Grundy	31 min
Jul 20, 2:07 PM CDT	Special Weather Statement	OHX	Bedford, Williamson	38 min
Jul 20, 2:11 PM CDT	Severe Thunderstorm Warning Considerable damage threat	OHX	Coffee, Grundy, Van Buren, Warren, White	34 min
Jul 20, 2:15 PM CDT	Flash Flood Warning	OHX	DeKalb, Putnam, Van Buren, White	3 hr
Jul 20, 2:17 PM CDT	Flash Flood Warning	OHX	DeKalb, Smith, Trousdale, Wilson	3 hr
Jul 20, 2:20 PM CDT	Areal Flood Advisory	OHX	Cheatham, Davidson, Dickson, Williamson	3 hr
Jul 20, 2:23 PM CDT	Areal Flood Advisory	OHX	Maury, Williamson	3 hr
Jul 20, 2:30 PM CDT	Severe Thunderstorm Warning	OHX	Bedford, Coffee, Grundy	45 min
Jul 20, 2:32 PM CDT	Flash Flood Warning	OHX	Bedford, Cannon, Coffee, Grundy, Warren	3 hr
Jul 20, 2:34 PM CDT	Areal Flood Advisory	OHX	Bedford, Coffee, Marshall, Maury, Rutherford, Williamson	3 hr
Jul 20, 2:41 PM CDT	Special Weather Statement	OHX	Giles	34 min
Jul 20, 2:49 PM CDT	Special Weather Statement	OHX	Marshall	41 min
Jul 20, 2:52 PM CDT	Severe Thunderstorm Warning	OHX	Giles	23 min
Jul 20, 2:55 PM CDT	Severe Thunderstorm Warning	OHX	Bedford, Giles, Marshall, Maury	35 min
Jul 20, 3:16 PM CDT	Flash Flood Warning	OHX	Fentress, Pickett	3 hr
Jul 20, 3:45 PM CDT	Areal Flood Advisory	OHX	Bedford, Giles, Marshall, Maury	3 hr
Jul 20, 3:56 PM CDT	Areal Flood Advisory	OHX	Putnam	109 min

Nearby

Flash Flood Warnings in Tennessee, 2023 Every flash flood warning in 2023

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.