Alert archive / Tennessee / Flash Flood Warnings in 2017

Flash Flood Warning 22, NWS Nashville, TN

July 28, 20174 counties in Tennessee

NWS Nashville, TN issued this flash flood warning at Jul 28, 2017, 7:00 AM CDT for 4 counties in Tennessee. It was in force for 2 hr. 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: Jul 28, 2017, 7:00 AM CDT (12:00 UTC)
Expired: Jul 28, 2017, 9:00 AM CDT
In force: 2 hr
Issued by: NWS Nashville, TN
Area: Storm-based polygon
Flood severity: None

Counties Lawrence County, TN, Lewis County, TN, Perry County, TN, Wayne County, TN

The radar

The Nashville radar (KOHX), 113 km from the middle of the area, began a volume at 12:00 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 28, 7:10 AM CDT	FLASH FLOOD	8 N Lawrenceburg, TN	COUPLE OF INCHES OF WATER ON HWY 43 NEAR SUMMERTOWN. ONE LANE IMPASSABLE. OTHER DITCHES ARE AT BANKFULL.
Jul 28, 7:16 AM CDT	FLASH FLOOD	5 N Lawrenceburg, TN	1 FOOT OF WATER OVER OLD MILITARY ROAD AND HWY 43

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, 0.0 hours before the alert went out and 101 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: 452 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 622 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 84 m²/s²
0-3 km storm-relative helicity: 117 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

716 
WGUS54 KOHX 281200
FFWOHX
TNC099-101-135-181-281400-
/O.NEW.KOHX.FF.W.0022.170728T1200Z-170728T1400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Nashville TN
700 AM CDT FRI JUL 28 2017

The National Weather Service in Nashville has issued a

* Flash Flood Warning for...
  Southeastern Lewis County in Middle Tennessee...
  Northern Wayne County in Middle Tennessee...
  Northern Lawrence County in Middle Tennessee...
  Southeastern Perry County in Middle Tennessee...

* Until 900 AM CDT

* At 700 AM CDT, Doppler radar indicated thunderstorms producing
  heavy rain across the warned area. Flash flooding is expected to
  begin shortly.

* Some locations that will experience flooding include...
  Lawrenceburg, Waynesboro, Summertown, Ethridge, Flatwoods and
  Henryville.

LAT...LON 3552 8790 3547 8739 3563 8737 3562 8735
      3559 8735 3557 8732 3555 8732 3555 8729
      3551 8728 3550 8727 3550 8728 3547 8728
      3544 8729 3543 8721 3539 8722 3530 8721
      3529 8723 3537 8798

$$

27

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 28, 5:10 AM CDT	Areal Flood Advisory	OHX	Hickman, Lewis, Perry	2 hr
Jul 28, 6:07 AM CDT	Flash Flood Warning	OHX	Hickman, Lewis, Perry	3 hr
Jul 28, 8:21 AM CDT	Areal Flood Advisory	OHX	Giles, Lawrence, Marshall	3 hr
Jul 28, 8:46 AM CDT	Flash Flood Warning	OHX	Hickman, Lewis, Perry	89 min
Jul 28, 2:42 PM CDT	Areal Flood Advisory	OHX	Giles, Hickman, Lawrence, Lewis, Maury, Perry and 1 more	5 hr
Jul 28, 2:53 PM CDT	Special Weather Statement	OHX	Giles	37 min
Jul 28, 4:02 PM CDT	Special Weather Statement	OHX	Marshall, Maury	43 min
Jul 28, 4:20 PM CDT	Flash Flood Warning	OHX	Cannon, Rutherford	3 hr
Jul 28, 4:29 PM CDT	River Flood Advisory	OHX	Perry	16 hr
Jul 28, 4:29 PM CDT	River Flood Advisory	OHX	Giles	32 hr
Jul 28, 5:10 PM CDT	River Flood Advisory	OHX	Lawrence	15 hr

Nearby

Flash Flood Warnings in Tennessee, 2017 Every flash flood warning in 2017

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.