Alert archive / Tennessee / Flash Flood Warnings in 2021

Flash Flood Warning 33, NWS Nashville, TN

July 9, 2021Lawrence County, Wayne County, Tennessee

NWS Nashville, TN issued this flash flood warning at Jul 9, 2021, 10:22 AM CDT for Lawrence County, Wayne County, Tennessee. It was in force for 113 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: Jul 9, 2021, 10:22 AM CDT (15:22 UTC)
Expired: Jul 9, 2021, 12:15 PM CDT
In force: 113 min
Issued by: NWS Nashville, TN
Area: Storm-based polygon
Flood severity: None

Counties Lawrence County, TN, Wayne County, TN

The radar

The Columbus AFB radar (KGWX), 138 km from the middle of the area, began a volume at 15:24 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
Jul 9, 11:00 AM CDT	FLASH FLOOD	Iron City, TN	23 PEOPLE WERE TRAPPED ALONG SHOAL CREEK NEAR IRON CITY

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, 3.4 hours before the alert went out and 158 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: 1159 J/kg
Mixed-layer CIN: -27 J/kg
Mixed-layer LCL: 690 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 53 m²/s²
0-3 km storm-relative helicity: 69 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.4

Open this sounding in Storm Lab

The text

As transmitted.

908 
WGUS54 KOHX 091522
FFWOHX
TNC099-181-091715-
/O.NEW.KOHX.FF.W.0033.210709T1522Z-210709T1715Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Nashville TN
1022 AM CDT Fri Jul 9 2021

The National Weather Service in Nashville has issued a

* Flash Flood Warning for...
  Southwestern Lawrence County in middle Tennessee...
  Southeastern Wayne County in middle Tennessee...

* Until 1215 PM CDT.

* At 1022 AM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 3 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...
  Loretto, Collinwood, St. Joseph, Iron City, Westpoint and Cypress 
  Inn.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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 3501 8783 3515 8782 3513 8740 3501 8739
      3500 8769 3500 8771 3500 8775 3500 8776
      3500 8777 3501 8777

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
Jul 8, 7:48 PM CDT	Special Weather Statement	OHX	Rutherford	27 min
Jul 8, 11:34 PM CDT	Special Weather Statement	OHX	Hickman	41 min
Jul 9, 12:38 AM CDT	Special Weather Statement	OHX	Houston	37 min
Jul 9, 12:47 AM CDT	Special Weather Statement	OHX	Maury	28 min
Jul 9, 7:02 AM CDT	Special Weather Statement	OHX	Cumberland, DeKalb, Van Buren, Warren, White	43 min
Jul 9, 8:05 AM CDT	Special Weather Statement	OHX	Wayne	55 min
Jul 9, 9:16 AM CDT	Special Weather Statement	OHX	Lawrence	44 min
Jul 9, 9:43 AM CDT	Special Weather Statement	OHX	Giles	47 min
Jul 9, 10:09 AM CDT	Areal Flood Advisory	OHX	Lawrence, Wayne	3 hr
Jul 9, 10:17 AM CDT	Special Weather Statement	OHX	Lawrence	43 min
Jul 9, 2:45 PM CDT	Areal Flood Advisory	OHX	Hickman, Lewis, Perry	2 hr
Jul 9, 3:00 PM CDT	Special Weather Statement	OHX	Marshall	30 min
Jul 9, 3:24 PM CDT	Special Weather Statement	OHX	Marshall	36 min
Jul 9, 3:47 PM CDT	Areal Flood Advisory	OHX	Maury	118 min
Jul 9, 4:03 PM CDT	Special Weather Statement	OHX	Marshall	42 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.