Alert archive / Tennessee / Flash Flood Warnings in 2017

Flash Flood Warning 8, NWS Nashville, TN

April 22, 20177 counties in Tennessee

NWS Nashville, TN issued this flash flood warning at Apr 22, 2017, 3:15 PM CDT for 7 counties in Tennessee. It was in force for 3 hr. 3 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: Apr 22, 2017, 3:15 PM CDT (20:15 UTC)
Expired: Apr 22, 2017, 6:15 PM CDT
In force: 3 hr
Issued by: NWS Nashville, TN
Area: Storm-based polygon
Flood severity: None

Counties Giles County, TN, Hickman County, TN, Lawrence County, TN, Lewis County, TN, Marshall County, TN, Maury County, TN, Williamson County, TN

The radar

The Nashville radar (KOHX), 84 km from the middle of the area, began a volume at 20:15 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
Apr 22, 5:42 PM CDT	FLOOD	2 N Chapel Hill, TN	MANY BACK ROADS IN NORTHERN MARSHALL COUNTY ARE COVERED BY WATER.
Apr 22, 5:42 PM CDT	FLASH FLOOD	Chapel Hill, TN	SEVERAL SECONDARY ROADS FLOODED ACROSS NORTHERN MARSHALL COUNTY
Apr 22, 5:45 PM CDT	FLASH FLOOD	4 Ne Lewisburg, TN	FLOOD WATERS SURROUNDED HOMES ON OLD FARMINGTON ROAD NEAR LEWISBURG

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, 8.3 hours before the alert went out and 71 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: 878 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 51 m²/s²
0-3 km storm-relative helicity: 96 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

085 
WGUS54 KOHX 222015
FFWOHX
TNC055-081-099-101-117-119-187-222315-
/O.NEW.KOHX.FF.W.0008.170422T2015Z-170422T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Nashville TN
315 PM CDT SAT APR 22 2017

The National Weather Service in Nashville has issued a

* Flash Flood Warning for...
  East central Lewis County in Middle Tennessee...
  Marshall County in Middle Tennessee...
  Maury County in Middle Tennessee...
  Northeastern Lawrence County in Middle Tennessee...
  Southern Williamson County in Middle Tennessee...
  Giles County in Middle Tennessee...
  East central Hickman County in Middle Tennessee...

* Until 615 PM CDT

* At 313 PM CDT, Doppler radar indicated thunderstorms producing
  heavy rain across the warned area. Up to three inches of rain have 
  already fallen and an additional one two inches of rain are 
  expected. Flash flooding is expected to begin shortly.

* Some locations that will experience flooding include...
  Columbia, Lewisburg, Lawrenceburg, Pulaski, Spring Hill, Mount
  Pleasant, Thompson's Station, Summertown, and Chapel Hill.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3513 8741 3582 8728 3587 8662 3579 8661
      3579 8666 3577 8666 3575 8670 3572 8670
      3569 8664 3558 8666 3558 8663 3557 8665
      3546 8667 3538 8663 3536 8660 3533 8660
      3531 8668 3525 8675 3526 8683 3514 8683

$$

Jackson

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 21, 8:20 PM CDT	Flash Flood Watch	OHX	Bedford, Cannon, Cheatham, Clay, Coffee, Cumberland and 32 more	31 hr
Apr 22, 2:30 AM CDT	Areal Flood Advisory	OHX	Hickman, Humphreys, Perry	3 hr
Apr 22, 3:54 AM CDT	Areal Flood Advisory	OHX	Cheatham, Dickson, Hickman, Williamson	3 hr
Apr 22, 4:09 AM CDT	Areal Flood Advisory	OHX	Cheatham, Davidson, Williamson	4 hr
Apr 22, 5:06 AM CDT	Areal Flood Advisory	OHX	Hickman, Lewis, Maury, Williamson	114 min
Apr 22, 5:19 AM CDT	River Flood Advisory	OHX	Davidson	12 hr
Apr 22, 5:26 AM CDT	Areal Flood Advisory	OHX	Hickman, Humphreys, Perry	2 hr
Apr 22, 5:36 AM CDT	River Flood Advisory	OHX	Davidson	5 hr
Apr 22, 5:58 AM CDT	Areal Flood Advisory	OHX	Davidson, Rutherford, Williamson, Wilson	2 hr
Apr 22, 6:30 AM CDT	River Flood Advisory	OHX	Davidson	6 hr
Apr 22, 6:48 AM CDT	Areal Flood Advisory	OHX	Cumberland, Fentress, Overton, Putnam, White	117 min
Apr 22, 6:52 AM CDT	River Flood Advisory	OHX	Davidson	10 hr
Apr 22, 7:15 AM CDT	River Flood Warning	OHX	Davidson	24 hr
Apr 22, 8:35 AM CDT	River Flood Warning	OHX	Hickman	4 days
Apr 22, 8:49 AM CDT	River Flood Advisory	OHX	Maury	12 hr
Apr 22, 9:01 AM CDT	Areal Flood Advisory	OHX	Davidson, Williamson	119 min
Apr 22, 9:51 AM CDT	Areal Flood Advisory	OHX	Cumberland, Fentress	3 hr
Apr 22, 10:09 AM CDT	River Flood Warning	OHX	Cheatham	37 hr
Apr 22, 10:17 AM CDT	River Flood Advisory	OHX	Hickman	18 hr
Apr 22, 10:17 AM CDT	River Flood Advisory	OHX	Bedford	18 hr
Apr 22, 10:22 AM CDT	River Flood Advisory	OHX	Davidson	10 hr
Apr 22, 10:22 AM CDT	River Flood Advisory	OHX	Davidson	7 hr
Apr 22, 10:29 AM CDT	River Flood Advisory	OHX	Davidson, Williamson	40 hr
Apr 22, 10:29 AM CDT	River Flood Advisory	OHX	Williamson	26 hr
Apr 22, 10:29 AM CDT	River Flood Advisory	OHX	Williamson	26 hr
Apr 22, 12:58 PM CDT	River Flood Advisory	OHX	Perry	9 hr
Apr 22, 1:53 PM CDT	Areal Flood Advisory	OHX	Davidson, Rutherford, Sumner, Williamson, Wilson	3 hr
Apr 22, 2:05 PM CDT	Flash Flood Warning	OHX	Hickman, Perry	3 hr
Apr 22, 2:40 PM CDT	Flash Flood Warning	OHX	Wilson	3 hr
Apr 22, 2:51 PM CDT	Special Weather Statement	OHX	Wayne	39 min
Apr 22, 3:01 PM CDT	Severe Thunderstorm Warning	OHX	Lawrence, Lewis, Wayne	44 min
Apr 22, 3:21 PM CDT	Tornado Warning	OHX	Lawrence, Wayne	24 min
Apr 22, 3:40 PM CDT	Severe Thunderstorm Warning	OHX	Giles, Lawrence	35 min
Apr 22, 3:48 PM CDT	Flash Flood Warning	OHX	Hickman, Williamson	3 hr
Apr 22, 3:52 PM CDT	Tornado Warning	OHX	Giles, Lawrence	23 min
Apr 22, 4:11 PM CDT	Tornado Warning Tornado observed	OHX	Giles	34 min
Apr 22, 4:25 PM CDT	Special Weather Statement	OHX	Davidson	50 min
Apr 22, 4:43 PM CDT	Special Weather Statement	OHX	Grundy	47 min
Apr 22, 6:02 PM CDT	Areal Flood Advisory	OHX	Coffee, Cumberland, DeKalb, Fentress, Grundy, Overton and 5 more	118 min

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.