Alert archive / Tennessee / Flash Flood Warnings in 1991

Flash Flood Warning 9, NWS Atlanta, GA

April 15, 1991Hamilton County, Tennessee

NWS Atlanta, GA issued this flash flood warning at Apr 15, 1991, 3:00 AM EDT for Hamilton County, Tennessee. It was in force for 2 hr.

The area

The counties it named.

The facts

Issued
Apr 15, 1991, 3:00 AM EDT (07:00 UTC)
Expired
Apr 15, 1991, 5:00 AM EDT
In force
2 hr
Issued by
NWS Atlanta, GA
Area
Whole counties

County Hamilton County, TN

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 00:00Z, 7.0 hours before the alert went out and 167 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 1991-04-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 39 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 1991-04-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 83 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
39 J/kg
Mixed-layer CIN
-123 J/kg
Mixed-layer LCL
1234 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
83 m²/s²
0-3 km storm-relative helicity
93 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 150702
FFWCHA
TNC065-150900-
 
BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE CHATTANOOGA TENNESSEE
300 AM EDT MON APR 15 1991
 
THE NATIONAL WEATHER SERVICE IN CHATTANOOGA TENNESSEE HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL  500 AM EDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS
 
IN SOUTHEAST TENNESSEE
 
   ...HAMILTON COUNTY
 
AT 255 AM EDT...THE CHATTANOOGA WEATHER RADAR INDICATED THUNDERSTORMS
WITH VERY HEAVY RAIN OVER THE CHATTANOOGA AREA.
 
THESE THUNDERSTORMS HAVE PRODUCED RAINFALL AMOUNTS IN EXCESS OF 1/2
INCH DURING THE PAST FEW MINUTES AT THE CHATTANOOGA AIRPORT AND
FLASH FLOODING WILL LIKELY OCCUR IN SECTIONS OF CHATTANOOGA AND
HAMILTON COUNTY.
 
BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE
THE DANGERS OF FLOODS AND FLASH FLOODS.  IF FLASH FLOODING IS
OBSERVED...ACT QUICKLY.  MOVE UP TO ESCAPE FLOOD WATERS.  DO
NOT STAY IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING.
 (

Nearby

Flash Flood Warnings in Tennessee, 1991Every flash flood warning in 1991

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.