Alert archive / Tennessee / Tornado Warnings in 2006

Tornado Warning 13, NWS Morristown, TN

April 21, 2006Roane County, Tennessee

NWS Morristown, TN issued this tornado warning at Apr 21, 2006, 6:29 PM EDT for Roane County, Tennessee. It was in force for 31 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Apr 21, 2006, 6:29 PM EDT (22:29 UTC)
Expired: Apr 21, 2006, 7:00 PM EDT
In force: 31 min
Issued by: NWS Morristown, TN
Area: Counties, with a storm outline in the text

County Roane County, TN

The radar

The Knoxville radar (KMRX), 103 km from the middle of the area, began a volume at 22:29 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.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Apr 21, 4:33 PM EDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 10.5 hours before the alert went out and 191 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: 3 J/kg
Mixed-layer CIN: -311 J/kg
Mixed-layer LCL: 1339 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 98 m²/s²
0-3 km storm-relative helicity: 140 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 
WFUS54 KMRX 212230
TORMRX
TNC145-212300-
/O.NEW.KMRX.TO.W.0013.060421T2229Z-060421T2300Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE MORRISTOWN TN
629 PM EDT FRI APR 21 2006

THE NATIONAL WEATHER SERVICE IN MORRISTOWN HAS ISSUED A

* TORNADO WARNING FOR...
  ROANE COUNTY IN EAST TENNESSEE
  THIS INCLUDES THE CITY OF KINGSTON

* UNTIL 700 PM EDT

* AT 628 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR KINGSTON...
  MOVING NORTHEAST AT 30 MPH.

* THE TORNADO IS WILL BE NEAR...
  OLIVER SPRINGS BY 655 PM EDT

WHEN A TORNADO WARNING IS ISSUED BASED ON DOPPLER RADAR...IT MEANS
THAT STRONG ROTATION HAS BEEN DETECTED IN THE STORM. A TORNADO MAY
HAVE ALREADY FORMED...OR IS EXPECTED TO DEVELOP SHORTLY. IF YOU ARE
IN THE PATH OF THIS DANGEROUS STORM...MOVE INDOORS AND TO THE LOWEST
LEVEL OF THE BUILDING. STAY AWAY FROM WINDOWS. IF DRIVING...DO NOT
SEEK SHELTER UNDER A HIGHWAY OVERPASS.

THE SAFEST PLACE TO BE DURING A TORNADO IS IN A BASEMENT OR A STORM
SHELTER. GET UNDER A WORKBENCH OR OTHER PIECE OF STURDY FURNITURE. IF
NO BASEMENT IS AVAILABLE...SEEK SHELTER ON THE LOWEST FLOOR OF THE
STRUCTURE IN AN INTERIOR HALLWAY...ROOM OR CLOSET. USE BLANKETS OR
PILLOWS TO COVER YOUR BODY AND ALWAYS STAY AWAY FROM WINDOWS.

IF IN MOBILE HOMES OR VEHICLES...EVACUATE THEM AND GET INSIDE A
SUBSTANTIAL SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE
NEAREST DITCH OR OTHER LOW SPOT AND COVER YOUR HEAD.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1100 PM EDT FRIDAY EVENING
FOR SOUTHWEST NORTH CAROLINA AND EAST TENNESSEE.

LAT...LON 3592 8469 3570 8451 3592 8428 3606 8433

$$

TG

1 follow-up statement

000 
WWUS54 KMRX 212258
SVSMRX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MORRISTOWN TN
657 PM EDT FRI APR 21 2006

TNC145-212307-
/O.EXP.KMRX.TO.W.0013.000000T0000Z-060421T2300Z/
ROANE TN-
657 PM EDT FRI APR 21 2006

...THE TORNADO WARNING FOR ROANE COUNTY EXPIRES AT 700 PM EDT...

A POTENTIALLY TORNADIC STORM WAS LOCATED JUST SOUTH OF OLIVER 
SPRINGS AND WAS MOVING EAST INTO ANDERSON COUNTY. THEREFORE...THE 
WARNING FOR ROANE COUNTY WILL BE ALLOWED TO EXPIRE AT 7 PM.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1100 PM EDT FRIDAY EVENING
FOR SOUTHWEST NORTH CAROLINA AND EAST TENNESSEE.

LAT...LON 3592 8469 3570 8451 3592 8428 3606 8433

$$

DMG

The office that day

Everything else NWS Morristown, TN issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 21, 7:17 AM EDT	Severe Thunderstorm Warning	MRX	Marion	43 min
Apr 21, 7:35 AM EDT	Severe Thunderstorm Warning	MRX	McMinn	25 min
Apr 21, 7:55 AM EDT	Severe Thunderstorm Warning	MRX	Marion	35 min
Apr 21, 8:44 AM EDT	Severe Thunderstorm Warning	MRX	Hamilton	31 min
Apr 21, 9:24 AM EDT	Flood Watch	MRX	Anderson, Bledsoe, Blount, Bradley, Campbell, Carter and 27 more	21 hr
Apr 21, 4:05 PM EDT	Severe Thunderstorm Warning	MRX	Marion	40 min
Apr 21, 4:45 PM EDT	Severe Thunderstorm Warning	MRX	Marion	30 min
Apr 21, 4:55 PM EDT	Severe Thunderstorm Warning	MRX	Bledsoe	35 min
Apr 21, 5:12 PM EDT	Severe Thunderstorm Warning	MRX	Hamilton	48 min
Apr 21, 5:49 PM EDT	Severe Thunderstorm Warning	MRX	Morgan, Roane	41 min
Apr 21, 6:12 PM EDT	Severe Thunderstorm Warning	MRX	Anderson	48 min
Apr 21, 6:43 PM EDT	Tornado Warning	MRX	Anderson, Knox	47 min
Apr 21, 7:10 PM EDT	Severe Thunderstorm Warning	MRX	Union	35 min
Apr 21, 7:12 PM EDT	Severe Thunderstorm Warning	MRX	Loudon, Monroe	33 min
Apr 21, 7:44 PM EDT	Severe Thunderstorm Warning	MRX	Blount, Knox, Loudon	46 min
Apr 21, 7:54 PM EDT	Severe Thunderstorm Warning	MRX	Hamilton	36 min

Nearby

Tornado Warnings in Tennessee, 2006 Every tornado warning in 2006 Tornadoes in 2006

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.