Alert archive / Tennessee / Flash Flood Warnings in 2018

Flash Flood Warning 3, NWS Nashville, TN

March 1, 20184 counties in Tennessee

NWS Nashville, TN issued this flash flood warning at Mar 1, 2018, 7:23 AM CST for 4 counties in Tennessee. It was in force for 3 hr. 4 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: Mar 1, 2018, 7:23 AM CST (13:23 UTC)
Expired: Mar 1, 2018, 10:15 AM CST
In force: 3 hr
Issued by: NWS Nashville, TN
Area: Storm-based polygon
Flood severity: None

Counties Bedford County, TN, Marshall County, TN, Rutherford County, TN, Williamson County, TN

The radar

The Nashville radar (KOHX), 64 km from the middle of the area, began a volume at 13:24 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
Mar 1, 8:30 AM CST	FLASH FLOOD	Lewisburg, TN	SR 271 NEAR MILE MARKER 7 AND SR 272 AT VERONA CANEY RD ARE CLOSED DUE TO HIGH WATER.
Mar 1, 8:41 AM CST	FLASH FLOOD	Murfreesboro, TN	NUMEROUS ROADS CLOSED ACROSS RUTHERFORD COUNTY DUE TO HIGH WATER.
Mar 1, 8:50 AM CST	FLASH FLOOD	Wartrace, TN	NUMEROUS ROADS CLOSED IN BEDFORD COUNTY ESPECIALLY AROUND WARTRACE.
Mar 1, 9:30 AM CST	FLASH FLOOD	Franklin, TN	NUMEROUS ROADS CLOSED IN WILLIAMSON COUNTY DUE TO HIGH WATER.

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, 1.4 hours before the alert went out and 50 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: 1018 m above ground
0-6 km bulk shear: 78 kt
0-1 km storm-relative helicity: 0 m²/s²
0-3 km storm-relative helicity: -57 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

841 
WGUS54 KOHX 011323
FFWOHX
TNC003-117-149-187-011615-
/O.NEW.KOHX.FF.W.0003.180301T1323Z-180301T1615Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Nashville TN
723 AM CST THU MAR 1 2018

The National Weather Service in Nashville has issued a

* Flash Flood Warning for...
  Marshall County in Middle Tennessee...
  Rutherford County in Middle Tennessee...
  Williamson County in Middle Tennessee...
  Bedford County in Middle Tennessee...

* Until 1015 AM CST

* At 722 AM CST, Doppler radar indicated heavy rain will move into 
  the warned area. Three to four inches of rain have already fallen 
  and another one to two and half inches is possible over the next 
  hour or two. Flash flooding is expected to begin shortly.

* Some locations that will experience flooding include...
  Murfreesboro, Franklin, Shelbyville, Lewisburg, Smyrna, Brentwood,
  La Vergne, Spring Hill, Nolensville, Thompson's Station, Fairview,
  Walterhill, Rural Hill, Chapel Hill, Cornersville, Wartrace,
  Eagleville, Bell Buckle, Normandy and Raus.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Stay away or be swept away. River banks and culverts can become
unstable and unsafe.

&&

LAT...LON 3532 8685 3532 8691 3545 8695 3553 8685
      3571 8678 3585 8721 3605 8718 3604 8706
      3599 8704 3605 8692 3597 8662 3610 8651
      3598 8631 3596 8616 3571 8621 3569 8625
      3541 8625 3532 8642 3537 8659 3525 8675

$$

27

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 28, 6:28 PM CST	Areal Flood Advisory	OHX	Bedford, Giles, Hickman, Lawrence, Lewis, Marshall and 3 more	3 hr
Feb 28, 9:13 PM CST	Areal Flood Advisory	OHX	Bedford, Coffee, Giles, Grundy, Hickman, Lawrence and 7 more	12 hr
Feb 28, 9:17 PM CST	River Flood Advisory	OHX	Perry, Wayne	16 hr
Feb 28, 10:45 PM CST	Areal Flood Advisory	OHX	Cheatham, Davidson, Dickson, Hickman, Humphreys, Maury and 2 more	6 hr
Feb 28, 10:52 PM CST	Areal Flood Advisory	OHX	Cannon, Coffee, Davidson, DeKalb, Rutherford, Smith and 4 more	6 hr
Mar 1, 1:29 AM CST	River Flood Advisory	OHX	Bedford	12 hr
Mar 1, 4:42 AM CST	Areal Flood Advisory	OHX	Cheatham, Davidson, Dickson, Hickman, Humphreys, Maury and 2 more	4 hr
Mar 1, 4:44 AM CST	Areal Flood Advisory	OHX	Cannon, Coffee, Davidson, DeKalb, Rutherford, Smith and 4 more	4 hr
Mar 1, 4:47 AM CST	River Flood Advisory	OHX	Coffee	16 hr
Mar 1, 4:49 AM CST	River Flood Advisory	OHX	Bedford	3 hr
Mar 1, 5:20 AM CST	River Flood Advisory	OHX	Marshall	11 hr
Mar 1, 7:03 AM CST	River Flood Advisory	OHX	Grundy	14 hr
Mar 1, 7:06 AM CST	Flash Flood Warning	OHX	Giles, Lawrence, Wayne	3 hr
Mar 1, 7:15 AM CST	Flash Flood Warning	OHX	Hickman, Lewis, Maury, Perry	3 hr
Mar 1, 7:24 AM CST	Flash Flood Warning	OHX	Cannon, Coffee, Grundy, Warren	6 hr
Mar 1, 8:09 AM CST	River Flood Warning	OHX	Bedford	24 hr
Mar 1, 8:09 AM CST	River Flood Warning	OHX	Bedford, Marshall	24 hr
Mar 1, 8:11 AM CST	Areal Flood Advisory	OHX	Cumberland, DeKalb, Putnam, Van Buren, White	4 hr
Mar 1, 8:41 AM CST	River Flood Warning	OHX	Stewart	24 hr
Mar 1, 10:15 AM CST	Flash Flood Warning	OHX	Giles, Lawrence, Wayne	3 hr
Mar 1, 10:17 AM CST	Flash Flood Warning	OHX	Hickman, Lewis, Maury, Perry	3 hr
Mar 1, 10:19 AM CST	Flash Flood Warning	OHX	Bedford, Marshall, Rutherford, Williamson	3 hr
Mar 1, 1:19 PM CST	River Flood Warning	OHX	Perry, Wayne	47 hr
Mar 1, 1:49 PM CST	River Flood Advisory	OHX	Davidson, Williamson	19 hr
Mar 1, 4:17 PM CST	River Flood Warning	OHX	Marshall	38 hr

Nearby

Flash Flood Warnings in Tennessee, 2018 Every flash flood warning in 2018

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.