Alert archive / Tennessee / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 1, NWS Atlanta, GA

April 14, 1987Hamilton County, Marion County, Sequatchie County, Tennessee

NWS Atlanta, GA issued this severe thunderstorm warning at Apr 14, 1987, 9:02 PM EDT for Hamilton County, Marion County, Sequatchie 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: Apr 14, 1987, 9:02 PM EDT (01:02 UTC)
Expired: Apr 14, 1987, 10:00 PM EDT
In force: 58 min
Issued by: NWS Atlanta, GA
Area: Whole counties

Counties Hamilton County, TN, Marion County, TN, Sequatchie 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
Apr 14, 9:30 PM EDT	Hail 1	Hamilton, 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, 1.0 hours before the alert went out and 148 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1139 m above ground
0-6 km bulk shear: 73 kt
0-1 km storm-relative helicity: -216 m²/s²
0-3 km storm-relative helicity: -235 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 150102
SVRCHA
TNC065-115-153-150200-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE CHATTANOOGA TN
902 PM EDT TUE APR 14 1987
 
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING
EFFECTIVE UNTIL 1000 PM EDT FOR PEOPLE IN THE FOLLOWING COUNTIES...
 
IN SOUTHEAST TENNESSEE
          ...WESTERN HAMILTON...EASTERN MARION...SEQUATCHIE
 
AT 9PM EDT CHATTANOOGA WEATHER SERVICE RADAR INDICATED A VERY LARGE
SEVERE THUNDERSTORM OVER MARION COUNTY IN SOUTHEAST TENNESSEE...
PUBLIC REPORTS OF 3/4 INCH HAIL FROM THIS THUNDERSTORM HAS BEEN
RECEIVED FROM JASPER TENNESSEE.  MOVEMENT TOWARD THE NORTHE AST
AT 25 MPH.
 
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
Apr 14, 10:13 PM EDT	Severe Thunderstorm Warning	FFC	Hamilton	47 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 1987 Every severe thunderstorm warning in 1987

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.