Alert archive / Tennessee / Flash Flood Warnings in 1990

Flash Flood Warning 71, NWS Atlanta, GA

December 22, 1990Grundy County, Tennessee

NWS Atlanta, GA issued this flash flood warning at Dec 22, 1990, 10:30 AM CST for Grundy County, Tennessee. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued
Dec 22, 1990, 10:30 AM CST (16:30 UTC)
Expired
Dec 22, 1990, 2:30 PM CST
In force
4 hr
Issued by
NWS Atlanta, GA
Area
Whole counties

County Grundy 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, 4.5 hours before the alert went out and 114 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, Nashville Metro, TN at 12:00Z on 1990-12-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 35 joules per kilogram.LCLLFCEL10008507005003002001001 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, Nashville Metro, TN at 12:00Z on 1990-12-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 177 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
35 J/kg
Mixed-layer CIN
-66 J/kg
Mixed-layer LCL
553 m above ground
0-6 km bulk shear
49 kt
0-1 km storm-relative helicity
177 m²/s²
0-3 km storm-relative helicity
182 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 KCHA 221631
FFWCHA
TNC007-061-153-175-222030-
 
BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE CHATTANOOGA TENNESSEE
1130 AM EST (1030 AM CST) SAT DEC 22 1990
 
THE NATIONAL WEATHER SERVICE IN CHATTANOOGA TENNESSEE HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL  330 PM EST (230 PM CST)
FOR PEOPLE IN THE FOLLOWING LOCATIONS
 
IN SOUTHEAST TENNESSEE
 
   ...BLEDSOE COUNTY...GRUNDY COUNTY...SEQUATCHIE COUNTY
   ...VAN BUREN COUNTY
 
REPORTS FROM AROUND THE AREA INDICATE ALL STREAMS ARE BANKFULL AND
SOME MINOR FLOODING ALREADY OCCURRING. SOME MUDSLIDES ARE OCCURRING
ALONG MOUNTAIN ROADS.  WITH OCCASIONAL HEAVY RAIN THE REST OF THE DAY
FLOODING IN THESE AREAS WILL WORSEN.
 
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.

The office that day

Everything else NWS Atlanta, GA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Dec 22, 9:27 AM CSTFlash Flood WarningFFCRhea4 hr
Dec 22, 10:30 AM CSTFlash Flood WarningFFCBledsoe, Sequatchie, Van Buren4 hr
Dec 22, 1:37 PM CSTFlash Flood WarningFFCGrundy, Marion, Sequatchie5 hr
Dec 22, 1:37 PM CSTFlash Flood WarningFFCMeigs, Rhea5 hr
Dec 22, 1:37 PM CSTFlash Flood WarningFFCBledsoe, Van Buren5 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.