Alert archive / Tennessee / Flash Flood Warnings in 1990

Flash Flood Warning 5, NWS Morristown, TN

December 23, 1990Blount County, Sevier County, Tennessee

NWS Morristown, TN issued this flash flood warning at Dec 23, 1990, 3:05 PM EST for Blount County, Sevier County, Tennessee. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued
Dec 23, 1990, 3:05 PM EST (20:05 UTC)
Expired
Dec 23, 1990, 6:00 PM EST
In force
3 hr
Issued by
NWS Morristown, TN
Area
Whole counties

Counties Blount County, TN, Sevier 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

Athens Municipal, GA (KAHN), launched 12:00Z, 8.1 hours before the alert went out and 202 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-pSkew-T log-p diagram, Athens Municipal, GA at 12:00Z on 1990-12-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Athens Municipal, GA at 12:00Z on 1990-12-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 365 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
624 m above ground
0-6 km bulk shear
55 kt
0-1 km storm-relative helicity
365 m²/s²
0-3 km storm-relative helicity
381 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 
TTAA00 KTYS 232007
FFWTYS
TNC009-155-232300-
 
BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE KNOXVILLE TN
305 PM EST SUN DEC 23 1990
 
THE NATIONAL WEATHER SERVICE IN KNOXVILLE HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL  600 PM EST
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN EAST CENTRAL TENNESSEE
 
   ...BLOUNT COUNTY...SEVIER COUNTY
 
AT 300 PM EST RADAR INDICATED A LARGE AREA OF HEAVY RAIN MOVING INTO
BLOUNT AND SEVIER COUNTIES. WITH MANY STREAMS AT BANKFULL ALREADY...
FLASH FLOODING IS IMMINENT IN THE AREA OF BLOUNT COUNTY EAST OF
CHILHOWEE MOUNTAIN.
 
IN SEVIER COUNTY...MOST STREAMS WERE ALSO RUNNING BANKFULL AND THE
ADDITIONAL HEAVY RAINFALL AND RUNOFF FROM THE MOUNTAINS WILL PRODUCE
FLASH FLOODING.
 
 
DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY.  THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO
CROSS SAFELY.  VEHICLES CAUGHT IN RISING WATER SHOULD BE
ABANDONED QUICKLY.  MOVE TO HIGHER GROUND.
 
A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT.  IT'S
IMPORTANT TO KNOW WHERE YOU ARE RELATIVE TO STREAMS...RIVERS...OR
CREEKS WHICH CAN BECOME KILLERS IN HEAVY RAINS.  CAMPERS SHOULD
AVOID CAMPING ALONG STREAMS OR CREEKS DURING THREATENING RAINS.

The office that day

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

IssuedProductOfficeCountiesLasted
Dec 23, 2:21 AM ESTFlash Flood WarningMRXCumberland, Morgan, Roane4 hr
Dec 23, 4:37 AM ESTFlash Flood WarningMRXClaiborne, Union3 hr
Dec 23, 5:32 AM ESTFlash Flood WarningMRXBlount, Knox3 hr
Dec 23, 10:30 AM ESTFlash Flood WarningMRXBlount, Sevier2 hr

Nearby

Flash Flood Warnings in Tennessee, 1990Every flash flood warning in 1990

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.