Alert archive / Tennessee / Flash Flood Warnings in 1990

Flash Flood Warning 7, NWS Atlanta, GA

February 16, 1990Hamilton County, Tennessee

NWS Atlanta, GA issued this flash flood warning at Feb 16, 1990, 2:23 AM EST for Hamilton County, Tennessee. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued
Feb 16, 1990, 2:23 AM EST (07:23 UTC)
Expired
Feb 16, 1990, 5:30 AM EST
In force
3 hr
Issued by
NWS Atlanta, GA
Area
Whole counties

County Hamilton 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, 7.4 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 1990-02-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 7 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 1990-02-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 380 square meters per square second.1939587897117Sfc1 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
7 J/kg
Mixed-layer CIN
-101 J/kg
Mixed-layer LCL
801 m above ground
0-6 km bulk shear
64 kt
0-1 km storm-relative helicity
380 m²/s²
0-3 km storm-relative helicity
393 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 160725
FFWCHA
TNC065-161030-
 
BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE CHATTANOOGA TENNESSEE
223 AM EST FRI FEB 16 1990
 
THE NATIONAL WEATHER SERVICE IN CHATTANOOGA TENNESSEE HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL  530 AM EST
FOR PEOPLE IN THE FOLLOWING LOCATIONS
 
IN SOUTHEAST TENNESSEE
 
   ...HAMILTON COUNTY
 
AT 220 AM EST THE CHATTANOOGA WEATHER RADAR WAS INDICATING A LINE OF
THUNDERSTORMS MOVING INTO THE WESTERN SECTIONS OF HAMILTON COUNTY.
 
SINCE THE GROUND IS ALREADY SATURATED...FLASH FLOODING IS LIKELY WITH
THESE THUNDERSTORMS.
 
 
A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT.  IT'S
IMPORTANT TO KNOW WHERE YOU ARE vRELATIVE 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 Atlanta, GA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Feb 16, 7:49 AM ESTFlash Flood WarningFFCPolk3 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.