Alert archive / Tennessee / Flash Flood Warnings in 2017

Flash Flood Warning 35, NWS Nashville, TN

December 23, 20174 counties in Tennessee

NWS Nashville, TN issued this flash flood warning at Dec 23, 2017, 3:58 AM CST for 4 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: Dec 23, 2017, 3:58 AM CST (09:58 UTC)
Expired: Dec 23, 2017, 7:00 AM CST
In force: 3 hr
Issued by: NWS Nashville, TN
Area: Storm-based polygon
Flood severity: None

Counties Houston County, TN, Montgomery County, TN, Robertson County, TN, Stewart County, TN

The radar

The Ft Campbell radar (KHPX), 36 km from the middle of the area, began a volume at 09:59 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
Dec 23, 4:00 AM CST	FLASH FLOOD	Cedar Hill, TN	MULTIPLE ROADS CLOSED DUE TO FLOODING IN NORTHWEST AND MIDDLE PARTS OF ROBERTSON COUNTY
Dec 23, 5:10 AM CST	FLASH FLOOD	Clarksville, TN	SEVERAL ROADS REMAIN FLOODED ACROSS MONTGOMERY COUNTY PER ROBERTSON COUNTY FIRE AND RESCUE.
Dec 23, 5:38 AM CST	FLASH FLOOD	6 Ne Clarksville, TN	FLOOD WATERS 3 TO 4 FEET DEEP ON INTERNATIONAL BLVD AT HIGHWAY 79 WITH ROAD CLOSED

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 00:00Z, 10.0 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 715 m above ground
0-6 km bulk shear: 66 kt
0-1 km storm-relative helicity: -13 m²/s²
0-3 km storm-relative helicity: 20 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

883 
WGUS54 KOHX 230958
FFWOHX
TNC083-125-147-161-231300-
/O.NEW.KOHX.FF.W.0035.171223T0958Z-171223T1300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Nashville TN
358 AM CST SAT DEC 23 2017

The National Weather Service in Nashville has issued a

* Flash Flood Warning for...
  Montgomery County in Middle Tennessee...
  Stewart County in Middle Tennessee...
  Houston County in Middle Tennessee...
  Robertson County in Middle Tennessee...

* Until 700 AM CST

* At 356 AM CST, emergency management reported flash flooding 
  continues due to moderate to heavy rain across the warned area 
  with several roads closed due to flooding. Radar estimates and 
  rainfall gauge measurements indicate 2 to 5 inches of rain has 
  fallen across the warned area. Flash flooding is expected to 
  continue for a few more hours.

* Some locations that will experience flooding include...
  Clarksville, Springfield, Dover, Erin, White House, Greenbrier,
  Coopertown, Cross Plains, Tennessee Ridge, Big Rock, Orlinda,
  Adams, Cedar Hill, Cumberland City, Palmyra, Woodlawn, Houston
  County Airport, Land Between The Lakes, Indian Mound and
  Cunningham.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flash Flood Warning means that flooding is imminent or occurring.
If you are in the warned area move to higher ground immediately.
Residents living along streams and creeks should take immediate
precautions to protect life and property.

&&

LAT...LON 3666 8785 3663 8785 3665 8659 3663 8656
      3644 8668 3645 8712 3634 8751 3624 8773
      3624 8794 3631 8796 3645 8806 3656 8803
      3668 8807

$$

Shamburger

1 follow-up statement

256 
WGUS74 KOHX 231215
FFSOHX

Flash Flood Statement
National Weather Service Nashville TN
615 AM CST SAT DEC 23 2017

TNC083-125-147-161-231300-
/O.CON.KOHX.FF.W.0035.000000T0000Z-171223T1300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Montgomery TN-Stewart TN-Houston TN-Robertson TN-
615 AM CST SAT DEC 23 2017

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 700 AM CST FOR
MONTGOMERY...STEWART...HOUSTON AND ROBERTSON COUNTIES...

At 611 AM CST, Doppler radar indicated heavy rain across the warned 
area is ending. However, radar estimates and rain gauge reports 
indicate 3 to 5 inches of rain fell across the area in the past 24 
hours. Several roadways remain flooded and closed, including Highway 
79 at International Boulevard in Clarksville. With rainfall now 
ending, flood waters will gradually recede across the warned area 
this morning.


Some locations that will experience flooding include...
Clarksville, Springfield, Dover, Erin, White House, Greenbrier,
Coopertown, Cross Plains, Tennessee Ridge, Big Rock, Orlinda, Adams,
Cedar Hill, Cumberland City, Palmyra, Woodlawn, Houston County
Airport, Land Between The Lakes, Indian Mound and Cunningham.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Please report flooding to your local law enforcement agency when you
can do so safely.

&&

LAT...LON 3666 8785 3663 8785 3665 8659 3663 8656
      3644 8668 3645 8712 3634 8751 3624 8773
      3624 8794 3631 8796 3645 8806 3656 8803
      3668 8807

$$

Shamburger

The office that day

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

Issued	Product	Office	Counties	Lasted
Dec 23, 12:09 AM CST	River Flood Advisory	OHX	Giles	41 hr
Dec 23, 12:19 AM CST	River Flood Advisory	OHX	Lawrence	9 hr
Dec 23, 12:51 AM CST	River Flood Warning	OHX	Hickman	3 days
Dec 23, 1:04 AM CST	Flash Flood Warning	OHX	Houston, Montgomery, Robertson, Stewart	3 hr
Dec 23, 3:11 AM CST	Special Weather Statement	OHX	Davidson, Williamson	49 min
Dec 23, 3:41 AM CST	Special Weather Statement	OHX	Clay, Macon, Smith, Trousdale, Wilson	49 min
Dec 23, 3:54 AM CST	Special Weather Statement	OHX	Rutherford, Williamson	51 min
Dec 23, 4:00 AM CST	River Flood Advisory	OHX	Perry	10 hr
Dec 23, 5:10 AM CST	River Flood Advisory	OHX	Davidson	6 hr
Dec 23, 5:15 AM CST	River Flood Advisory	OHX	Davidson	3 hr
Dec 23, 5:30 AM CST	Areal Flood Advisory	OHX	Hickman, Lawrence, Lewis, Maury, Perry, Wayne	3 hr
Dec 23, 5:31 AM CST	River Flood Advisory	OHX	Davidson	3 hr
Dec 23, 5:47 AM CST	River Flood Advisory	OHX	Davidson, Williamson	32 hr
Dec 23, 5:52 AM CST	River Flood Advisory	OHX	Cheatham	11 hr
Dec 23, 5:52 AM CST	River Flood Advisory	OHX	Hickman	9 hr
Dec 23, 6:02 AM CST	River Flood Advisory	OHX	Davidson	4 hr
Dec 23, 6:08 AM CST	Special Weather Statement	OHX	Bedford, Cannon, Giles, Marshall, Rutherford	67 min
Dec 23, 6:15 AM CST	River Flood Advisory	OHX	Davidson	2 hr
Dec 23, 6:56 AM CST	Areal Flood Advisory	OHX	Houston, Montgomery, Robertson, Stewart	2 hr
Dec 23, 7:07 AM CST	River Flood Advisory	OHX	Davidson	3 hr
Dec 23, 9:10 AM CST	River Flood Advisory	OHX	Cheatham	5 hr
Dec 23, 10:09 AM CST	River Flood Advisory	OHX	Davidson	7 hr
Dec 23, 10:23 AM CST	River Flood Advisory	OHX	Bedford	7 hr
Dec 23, 1:14 PM CST	River Flood Advisory	OHX	Maury	36 hr
Dec 23, 1:21 PM CST	River Flood Warning	OHX	Montgomery, Robertson	23 hr
Dec 23, 1:37 PM CST	River Flood Warning	OHX	Perry	69 hr
Dec 23, 1:57 PM CST	River Flood Advisory	OHX	Lawrence	14 hr
Dec 23, 2:15 PM CST	River Flood Warning	OHX	Cheatham	21 hr
Dec 23, 2:23 PM CST	River Flood Warning	OHX	Hickman	24 hr
Dec 23, 4:41 PM CST	River Flood Advisory	OHX	Perry, Wayne	12 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.