Alert archive / Tennessee / Severe Thunderstorm Warnings in 1991

Severe Thunderstorm Warning 2, NWS Atlanta, GA

February 13, 1991Grundy County, Tennessee

NWS Atlanta, GA issued this severe thunderstorm warning at Feb 13, 1991, 9:28 PM CST for Grundy County, Tennessee. It was in force for 47 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
Feb 13, 1991, 9:28 PM CST (03:28 UTC)
Expired
Feb 13, 1991, 10:15 PM CST
In force
47 min
Issued by
NWS Atlanta, GA
Area
Whole counties

County Grundy County, TN

What was reported inside it

TimeReportWhereRemark
Feb 13, 9:35 PM CSTThunderstorm Wind 0Grundy, 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 00:00Z, 3.5 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 1991-02-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 258 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 1991-02-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 251 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
258 J/kg
Mixed-layer CIN
-7 J/kg
Mixed-layer LCL
592 m above ground
0-6 km bulk shear
46 kt
0-1 km storm-relative helicity
251 m²/s²
0-3 km storm-relative helicity
264 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.7

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KCHA 140330
SVRCHA
TNC061-140415-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE CHATTANOOGA TENNESSEE
1028 PM EST (928 PM CST) WED FEB 13 1991
 
THE NATIONAL WEATHER SERVICE IN CHATTANOOGA TENNESSEE HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 1115 PM EST (1015 PM CST)
FOR PEOPLE IN THE FOLLOWING LOCATIONS
 
IN SOUTHEAST TENNESSEE
 
   ...GRUNDY COUNTY
 
AT 1025 PM EDT THE CHATTANOOGA WEATHER RADAR INDICATED A SEVERE
THUNDERSTORM MOVING INTO THE WESTERN SECTIONS OF GRUNDY COUNTY.
 
THE STORM IS MOVING TO THE SOUTHEAST AT 55 TO 60 MILES PER HOUR.
 
THE TENNESSE HIGHWAY PATROL REPORTED VERY HIGH WIND AND HAIL
WITH THIS SAME STORM AS IT MOVED THROUGH COFFEE COUNTY.
 
 
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 BUILDI NG BUT STAY AWAY FROM WINDOWS.

The office that day

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

IssuedProductOfficeCountiesLasted
Feb 13, 9:44 PM CSTSevere Thunderstorm WarningFFCMarion46 min
Feb 13, 9:56 PM CSTSevere Thunderstorm WarningFFCSequatchie34 min
Feb 13, 10:05 PM CSTSevere Thunderstorm WarningFFCHamilton40 min
Feb 13, 10:33 PM CSTSevere Thunderstorm WarningFFCBradley42 min
Feb 13, 10:46 PM CSTSevere Thunderstorm WarningFFCPolk44 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 1991Every severe thunderstorm 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.