Alert archive / Tennessee / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 321, NWS Atlanta, GA

August 29, 1990McMinn County, Tennessee

NWS Atlanta, GA issued this severe thunderstorm warning at Aug 29, 1990, 5:17 PM EDT for McMinn County, Tennessee. It was in force for 58 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Aug 29, 1990, 5:17 PM EDT (21:17 UTC)
Expired: Aug 29, 1990, 6:15 PM EDT
In force: 58 min
Issued by: NWS Atlanta, GA
Area: Whole counties

County McMinn County, TN

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

What was reported inside it

Time	Report	Where	Remark
Aug 29, 5:30 PM EDT	Thunderstorm Wind 0	Mcminn, TN

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 9.3 hours before the alert went out and 195 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1006 J/kg
Mixed-layer CIN: -137 J/kg
Mixed-layer LCL: 1717 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 88 m²/s²
0-3 km storm-relative helicity: 93 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.0

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KCHA 292116
SVRCHA
TNC107-292215-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE CHATTANOOGA TENNESSEE
517 PM EDT WED AUG 29 1990
 
THE NATIONAL WEATHER SERVICE IN CHATTANOOGA TENNESSEE HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  615 PM EDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS
 
IN SOUTHEAST TENNESSEE
 
   ...MCMINN COUNTY
 
AT 515 PM EDT THE CHATTANOOGA WEATHER RADAR INDICATED A SEVERE
THUNDERSTORM MOVING INTO MCMINN COUNTY FROM MEIGS COUNTY.
 
THE STORM IS MOVING RAPIDLY TO THE SOUTHEAST TOWARD THE
CITY OF ATHENS.
 
THIS STORM HAS PRODUCED LARGE HAIL AND HAS BLOWN DOWN
TREES IN RHEA AND MEIGS COUNTIES SHORTLY AFTER 5 PM EDT.
 
 
THIS IS A DANGEROUS STORM.  IF YOU ARE IN ITS PATH YOU SHOULD
PREPARE FOR DAMAGING WIND IN EXCESS OF 55 MPH...LARGE HAIL...AND
DEADLY LIGHTNING.  PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT STAY AWAY FROM WINDOWS.
 g

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 29, 4:53 PM EDT	Severe Thunderstorm Warning	FFC	Meigs, Rhea	67 min
Aug 29, 5:56 PM EDT	Severe Thunderstorm Warning	FFC	Bradley, Hamilton, Polk	64 min
Aug 29, 7:00 PM EDT	Severe Thunderstorm Warning	FFC	Sequatchie	45 min
Aug 29, 7:14 PM EDT	Severe Thunderstorm Warning	FFC	Marion	46 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 1990 Every severe thunderstorm 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.