Alert archive / Tennessee / Flash Flood Warnings in 1990

Flash Flood Warning 60, NWS Atlanta, GA

July 21, 1990Bradley County, Tennessee

NWS Atlanta, GA issued this flash flood warning at Jul 21, 1990, 10:31 PM EDT for Bradley County, Tennessee. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued
Jul 21, 1990, 10:31 PM EDT (02:31 UTC)
Expired
Jul 22, 1990, 1:30 AM EDT
In force
3 hr
Issued by
NWS Atlanta, GA
Area
Whole counties

County Bradley 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 00:00Z, 2.5 hours before the alert went out and 191 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 00:00Z on 1990-07-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 47 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 00:00Z on 1990-07-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 24 square meters per square second.1939Sfc1 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
47 J/kg
Mixed-layer CIN
-197 J/kg
Mixed-layer LCL
1289 m above ground
0-6 km bulk shear
19 kt
0-1 km storm-relative helicity
24 m²/s²
0-3 km storm-relative helicity
10 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 220233
FFWCHA
TNC011-220530-
 
BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE CHATTANOOGA TENNESSEE
1031 PM EDT SAT JUL 21 1990
 
THE NATIONAL WEATHER SERVICE IN CHATTANOOGA TENNESSEE HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL  130 AM EDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS
 
IN SOUTHEAST TENNESSEE
 
   ...NORTHERN BRADLEY COUNTY
 
RADAR SHOWS A STRONG THUNDERSTORM OVER NORTHERN BRADLEY COUNTY OF
SOUTHEAST TENNESSEE. CIVIL DEFENCE AND SHERIFF REPORT OVER TWO INCHES
OF RAIN HAS FALLEN IN THAT AREA AND NUMEROUS STREETS AND ROADS ARE
FLOODED. THIS STORM PRODUCING THE VERY HEAVY RAIN IS ALMOST STATIONARY
ADDITION HEAVY RAIN CAN BE EXPECTED FOR A COUPLE MORE HOURS.
 
 
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 CROSyS A FLOWING STREAM...EVEN A
SMALL ONE...ON FOOT.

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 22, 6:26 PM EDTSevere Thunderstorm WarningFFCHamilton64 min

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.