Alert archive / Tennessee / Severe Thunderstorm Warnings in 1989

Severe Thunderstorm Warning 16, NWS Atlanta, GA

April 4, 1989Grundy County, Tennessee

NWS Atlanta, GA issued this severe thunderstorm warning at Apr 4, 1989, 2:44 AM CDT for Grundy County, Tennessee. It was in force for 31 min.

The area

The counties it named.

The facts

Issued
Apr 4, 1989, 2:44 AM CDT (07:44 UTC)
Expired
Apr 4, 1989, 3:15 AM CDT
In force
31 min
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 00:00Z, 7.7 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 00:00Z on 1989-04-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 119 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 1989-04-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 337 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
119 J/kg
Mixed-layer CIN
-120 J/kg
Mixed-layer LCL
735 m above ground
0-6 km bulk shear
56 kt
0-1 km storm-relative helicity
337 m²/s²
0-3 km storm-relative helicity
419 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KCHA 040748
SVRCHA
TNC061-040815-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE CHATTANOOGA TN
344 AM EDT (244 AM CDT) TUE APR 4 1989
 
THE NATIONAL WEATHER SERVICE IN CHATTANOOGA HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  415 AM EDT (315 AM CDT)
FOR PEOPLE IN THE FOLLOWING COUNTY...
 
IN SOUTHEAST TENNESSEE
          ...GRUNDY
 
WEATHER RADAR INDICATES A POSSIBLY SEVERE THUNDERSTORM MOVING INTO
WESTERN GRUNDY COUNTY. THE THUNDERSTORM IS MOVING TOWARD THE
EAST AT AROUND 45 MPH.
 
A TORNADO WATCH IS ALSO IN EFFECT FOR THE WARNED AREA.  REMEMBER
SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES
WITH LITTLE OR NO ADVANCE %WARNING.  REMAIN CALM BUT BE ALERT TO
RAPIDLY CHANGING WEATHER CONDITIONS.

Nearby

Severe Thunderstorm Warnings in Tennessee, 1989Every severe thunderstorm warning in 1989

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.