Alert archive / Tennessee / Severe Thunderstorm Warnings in 1996

Severe Thunderstorm Warning 21, NWS Morristown, TN

April 13, 1996Grainger County, Union County, Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Apr 13, 1996, 3:38 PM EDT for Grainger County, Union County, Tennessee. It was in force for 67 min. 2 reports 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 13, 1996, 3:38 PM EDT (19:38 UTC)
Expired: Apr 13, 1996, 4:45 PM EDT
In force: 67 min
Issued by: NWS Morristown, TN
Area: Whole counties

Counties Grainger County, TN, Union County, TN

The radar

The Knoxville radar (KMRX), 27 km from the middle of the area, began a volume at 19:37 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

Time	Report	Where	Remark
Apr 13, 4:05 PM EDT	Thunderstorm Wind	Rutledge, TN
Apr 13, 4:06 PM EDT	Thunderstorm Wind	South Part Of County, 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.

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 7.6 hours before the alert went out and 263 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: 982 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 75 m²/s²
0-3 km storm-relative helicity: 72 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 KMRX 131940
SVRMRX
TNC057-089-173-132045-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE KNOXVILLE TRI CITIES TN
338 PM EDT SAT APR 13 1996
 
THE NATIONAL WEATHER SERVICE IN KNOXVILLE TRI CITIES HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  445 PM EDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN EAST TENNESSEE
 
   ...GRAINGER COUNTY...JEFFERSON COUNTY...SOUTHERN UNION COUNTY
 
AT 338 PM EDT...NATIONAL WEATHER SERVICE INDICATED A LINE OF SEVERE
THUNDERSTORMS OVER KNOX COUNTY MOVING NORTHEAST AT 30 MILES AN HOUR
AND WILL MOVE INTO SOUTHERN UNION...GRAINGER...AND JEFFERSON COUNTIES.
DAMAGING WINDS AND HAIL UP TO DIME SIZE HAVE BEEN REPORTED WITH THIS
LINE OF STORMS.
 
 
 
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 Morristown, TN issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 13, 2:41 PM EDT	Severe Thunderstorm Warning	MRX	Meigs, Rhea, Roane	64 min
Apr 13, 2:52 PM EDT	Severe Thunderstorm Warning	MRX	Anderson, Knox, Loudon	68 min
Apr 13, 3:20 PM EDT	Severe Thunderstorm Warning	MRX	McMinn	55 min
Apr 13, 3:33 PM EDT	Severe Thunderstorm Warning	MRX	Monroe	57 min
Apr 13, 3:38 PM EDT	Severe Thunderstorm Warning	MRX	Jefferson	67 min
Apr 13, 3:52 PM EDT	Severe Thunderstorm Warning	MRX	Hamblen	68 min
Apr 13, 4:02 PM EDT	Severe Thunderstorm Warning	MRX	Blount	58 min
Apr 13, 4:23 PM EDT	Severe Thunderstorm Warning	MRX	Greene, Hawkins	67 min
Apr 13, 4:57 PM EDT	Severe Thunderstorm Warning	MRX	Sevier	63 min
Apr 13, 5:09 PM EDT	Severe Thunderstorm Warning	MRX	Sullivan, Washington	66 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 1996 Every severe thunderstorm warning in 1996

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; radar from the NEXRAD Level II archive.