Alert archive / Tennessee / Flash Flood Warnings in 2017

Flash Flood Warning 9, NWS Nashville, TN

April 22, 2017Hickman County, Williamson County, Tennessee

NWS Nashville, TN issued this flash flood warning at Apr 22, 2017, 3:48 PM CDT for Hickman County, Williamson County, Tennessee. It was in force for 3 hr. 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: Apr 22, 2017, 3:48 PM CDT (20:48 UTC)
Expired: Apr 22, 2017, 6:45 PM CDT
In force: 3 hr
Issued by: NWS Nashville, TN
Area: Storm-based polygon
Flood severity: None

Counties Hickman County, TN, Williamson County, TN

The radar

The Nashville radar (KOHX), 70 km from the middle of the area, began a volume at 20:51 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, 6:23 PM CDT	FLASH FLOOD	Franklin, TN	AERIAL IMAGERY OF EXTENSIVE FLOODING NEAR THE CARNTON PLANTATION.

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, 8.8 hours before the alert went out and 61 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.

787 
WGUS54 KOHX 222048
FFWOHX
TNC081-187-222345-
/O.NEW.KOHX.FF.W.0009.170422T2048Z-170422T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

The National Weather Service in Nashville has issued a

* Flash Flood Warning for...
  Williamson County in Middle Tennessee...
  Northern Hickman County in Middle Tennessee...

* Until 645 PM CDT

* At 347 PM CDT, Williamson County Emergency Management reported 
  several roads covered with water and water continuing to rise. Up 
  to three inches of rain have already fallen and an additional one 
  inch of rain is possible.

* Some locations that will experience flooding include...
  Franklin, Brentwood, Nolensville, Thompson's Station, Fairview, Bon
  Aqua, Primm Springs, Lyles, Natchez Trace At Highway 96, Bucksnort,
  Triune, Pinewood, Leipers Fork and Nunnelly.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3591 8770 3595 8761 3595 8756 3599 8753
      3596 8720 3605 8718 3604 8706 3599 8704
      3605 8693 3603 8678 3597 8662 3591 8663
      3585 8660 3582 8712 3585 8721 3581 8722
      3581 8730 3587 8729 3583 8772 3584 8772

$$

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, 3:15 PM CDT	Flash Flood Warning	OHX	Giles, Hickman, Lawrence, Lewis, Marshall, Maury and 1 more	3 hr
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, 3:52 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.