Alert archive / Tennessee / Flash Flood Warnings in 1986

Flash Flood Warning 2, NWS Nashville, TN

September 4, 1986Rutherford County, Williamson County, Tennessee

NWS Nashville, TN issued this flash flood warning at Sep 4, 1986, 4:00 PM CDT for Rutherford County, Williamson County, Tennessee. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued: Sep 4, 1986, 4:00 PM CDT (21:00 UTC)
Expired: Sep 4, 1986, 8:00 PM CDT
In force: 4 hr
Issued by: NWS Nashville, TN
Area: Whole counties

Counties Rutherford County, TN, Williamson County, TN

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 9.0 hours before the alert went out and 30 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: 232 J/kg
Mixed-layer CIN: -33 J/kg
Mixed-layer LCL: 542 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 78 m²/s²
0-3 km storm-relative helicity: 80 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAAOO KBNA 042100
FFWBNA
TNC149-187-050100-
 
BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE NASHVILLE TN
400 PM CDT THU SEP  4 1986
 
THE NATIONAL WEATHER SERVICE HAS ISSUED A FLASH FLOOD WARNING
EFFECTIVE UNTIL  800 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTIES:
 
IN CENTRAL TENNESSEE
          ..RUTHERFORD..WILLIAMSON...CANNON
 
RADAR INDICATES LARGE HEAVY THUNDERSTORMS IN WILLIAMSON AND
RUTHERFORD COUNTIES. THESE STORMS ARE CAPABLE OF PRODUCING MUCH RAIN
IN A FEW MINUTES. THEY ARE MOVING TOWARD THE EAST AT ABOUT 20 MILES
AND HOUR AND CAN BE EXPECTED TO MOVE INTO CANNON COUNTY SOON.

 
A FLASH FLOOD WARNING MEANS THAT FLOODING IS OCCURRING OR IS
IMMINENT.  MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES.  DO NOT
ATTEMPT TO CROSS BRIDGES, DIPS, OR LOW SPOTS IF WATER COVERS THE
ROADWAY.  NEVER TRY TO CROSS A FLOWING STREAM, EVEN A SMALL ONE,
ON FOOT.  TO ESCAPE RISING WATER MOVE UP TO HIGHER GROUND.
 
MOST DEATHS IN FLASH FLOODING OCCUR IN AUTOMOBILES.  DO NOT
ATTEMPT TO CROSS BRIDGES, DIPS, OR LOW SPOTS IF WATER COVERS THE
ROADWAY.  NEVER TRY TO CROSS A FLOWING STREAM, EVEN A SMALL ONE,
ON FOOT.

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 3, 10:55 PM CDT	Flash Flood Warning	OHX	Cannon, Rutherford, Wilson	4 hr
Sep 4, 4:00 PM CDT	Flash Flood Warning	OHX	Cannon	4 hr

Nearby

Flash Flood Warnings in Tennessee, 1986 Every flash flood warning in 1986

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive.