Alert archive / Tennessee / Severe Thunderstorm Warnings in 1991

Severe Thunderstorm Warning 3, NWS Atlanta, GA

February 13, 1991Marion County, Tennessee

NWS Atlanta, GA issued this severe thunderstorm warning at Feb 13, 1991, 9:44 PM CST for Marion County, Tennessee. It was in force for 46 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, 9:44 PM CST (03:44 UTC)
Expired: Feb 13, 1991, 10:30 PM CST
In force: 46 min
Issued by: NWS Atlanta, GA
Area: Whole counties

County Marion County, TN

What was reported inside it

Time	Report	Where	Remark
Feb 13, 9:59 PM CST	Thunderstorm Wind 0	Marion, 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, 3.7 hours before the alert went out and 142 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: 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 140346
SVRCHA
TNC115-140430-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE CHATTANOOGA TENNESSEE
1044 PM EST (944 PM CST) WED FEB 13 1991
 
THE NATIONAL WEATHER SERVICE IN CHATTANOOGA TENNESSEE HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 1130 PM EST (1030 PM CST)
FOR PEOPLE IN THE FOLLOWING LOCATIONS
 
IN SOUTHEAST TENNESSEE
 
   ...MARION COUNTY
 
AT 1040 PM EDT THE CHATTANOOGA WEATHER RADAR INDICATED A SEVERE
THUNDERSTORM MOVING INTO THE NORTHWEST PART OF MARION COUNTY.
 
AT 1035 PM EDT NICKLE SIZE HAIL WAS REPORTED BY THE MONTEAGLE
POLICE DEPARTMENT IN THE SOUTHEAST SECTION OF GRUNDY COUNTY. ALSO
THE TENNESSEE HIGHWAY PATROL REPORTED WIND DAMAGE AT A GAS STATION
IN PALMER...ALSO IN GRUNDY COUNTY.
 
THE THUNDERSTORM IS MOVING TO THE SOUTHEAST AT 55 TO 60 MILES PER
HOUR.
 
 
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55
MPH...DESTRUCTIVE HAIL...DEADLY LIGHTNING...:AND VERY HEAVY RAIN.
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR
OF YOUR HOME OR BUSINESS.  HEAVY RAINS FLOOD ROADS QUICKLY SO
DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 13, 9:28 PM CST	Severe Thunderstorm Warning	FFC	Grundy	47 min
Feb 13, 9:56 PM CST	Severe Thunderstorm Warning	FFC	Sequatchie	34 min
Feb 13, 10:05 PM CST	Severe Thunderstorm Warning	FFC	Hamilton	40 min
Feb 13, 10:33 PM CST	Severe Thunderstorm Warning	FFC	Bradley	42 min
Feb 13, 10:46 PM CST	Severe Thunderstorm Warning	FFC	Polk	44 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 1991 Every 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.