Alert archive / Tennessee / Tornado Warnings in 2011

Tornado Warning 78, NWS Morristown, TN

April 27, 20115 counties in Tennessee

NWS Morristown, TN issued this tornado warning at Apr 27, 2011, 10:49 PM EDT for 5 counties in Tennessee. It was in force for 26 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 27, 2011, 10:49 PM EDT (02:49 UTC)
Expired: Apr 27, 2011, 11:15 PM EDT
In force: 26 min
Issued by: NWS Morristown, TN
Area: Storm-based polygon

Counties Blount County, TN, Knox County, TN, Loudon County, TN, Monroe County, TN, Sevier County, TN

The radar

The Knoxville radar (KMRX), 81 km from the middle of the area, began a volume at 02:51 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 27, 4:36 PM EDT	Tornado Watch PDS	SPC	8 hr

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 00:00Z, 2.8 hours before the alert went out and 216 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: 308 J/kg
Mixed-layer CIN: -100 J/kg
Mixed-layer LCL: 669 m above ground
0-6 km bulk shear: 104 kt
0-1 km storm-relative helicity: 169 m²/s²
0-3 km storm-relative helicity: 247 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.3

Open this sounding in Storm Lab

The text

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

030 
WFUS54 KMRX 280249
TORMRX
TNC009-093-105-123-155-280315-
/O.NEW.KMRX.TO.W.0078.110428T0249Z-110428T0315Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE MORRISTOWN TN
1049 PM EDT WED APR 27 2011

THE NATIONAL WEATHER SERVICE IN MORRISTOWN HAS ISSUED A

* TORNADO WARNING FOR...
  BLOUNT COUNTY IN EAST TENNESSEE...
  KNOX COUNTY IN EAST TENNESSEE...
  LOUDON COUNTY IN EAST TENNESSEE...
  MONROE COUNTY IN EAST TENNESSEE...
  SEVIER COUNTY IN EAST TENNESSEE...

* UNTIL 1115 PM EDT

* AT 1042 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 6 MILES NORTH OF
  MADISONVILLE. DOPPLER RADAR SHOWED THIS TORNADO MOVING NORTHEAST AT
  50 MPH.

* THIS TORNADIC STORM WILL BE NEAR...
  MARYVILLE AND FARRAGUT AROUND 1100 PM EDT.
  ALCOA AND EAGLETON VILLAGE AROUND 1105 PM EDT.
  KNOXVILLE AROUND 1110 PM EDT.

OTHER LOCATIONS AFFECTED BY THIS TORNADIC THUNDERSTORM INCLUDE
FRIENDSVILLE...CLOVER HILL...WILDWOOD...LAKE FOREST...SEYMOUR AND
KIMBERLIN HEIGHTS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THE SAFEST PLACE TO BE DURING A TORNADO IS IN A BASEMENT. GET UNDER A
WORKBENCH OR OTHER PIECE OF STURDY FURNITURE. IF NO BASEMENT IS
AVAILABLE...SEEK SHELTER ON THE LOWEST FLOOR OF THE BUILDING IN AN
INTERIOR HALLWAY OR ROOM SUCH AS A 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 WITH YOUR HANDS.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 100 AM EDT THURSDAY MORNING 
FOR SOUTHWEST NORTH CAROLINA AND EAST TENNESSEE. A TORNADO WATCH 
ALSO REMAINS IN EFFECT UNTIL 100 AM EDT THURSDAY MORNING FOR 
SOUTHWEST VIRGINIA.

&&

LAT...LON 3574 8447 3575 8443 3577 8442 3577 8439
      3587 8434 3589 8431 3588 8428 3593 8425
      3599 8417 3603 8406 3606 8408 3617 8394
      3590 8349 3548 8421
TIME...MOT...LOC 0249Z 231DEG 59KT 3568 8422

$$

17

1 follow-up statement

339 
WWUS54 KMRX 280304
SVSMRX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MORRISTOWN TN
1104 PM EDT WED APR 27 2011

TNC009-093-105-123-155-280315-
/O.CON.KMRX.TO.W.0078.000000T0000Z-110428T0315Z/
LOUDON TN-KNOX TN-MONROE TN-SEVIER TN-BLOUNT TN-
1104 PM EDT WED APR 27 2011

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1115 PM EDT FOR
BLOUNT...SEVIER...MONROE...KNOX AND LOUDON COUNTIES...

AT 1100 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE A POSSIBLE TORNADO.  THIS TORNADO WAS LOCATED NEAR 
FRIENDSVILLE...OR 6 MILES WEST OF ALCOA...MOVING NORTHEAST AT 65 MPH.

THE TORNADO WILL BE NEAR...
  KNOXVILLE AROUND 1110 PM EDT.

OTHER LOCATIONS AFFECTED BY THIS SEVERE THUNDERSTORM INCLUDE LAKE
FOREST AND KIMBERLIN HEIGHTS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER IN A NEARBY REINFORCED
BUILDING. AS A LAST RESORT...SEEK SHELTER IN A CULVERT...DITCH OR LOW
SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

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

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

A TORNADO WATCH REMAINS IN EFFECT UNTIL 100 AM EDT THURSDAY MORNING 
FOR SOUTHWEST NORTH CAROLINA AND CENTRAL TENNESSEE.

&&

LAT...LON 3574 8447 3575 8443 3577 8442 3577 8439
      3587 8434 3589 8431 3588 8428 3593 8425
      3599 8417 3603 8406 3606 8408 3617 8394
      3590 8349 3548 8421
TIME...MOT...LOC 0304Z 232DEG 59KT 3586 8402

$$

TD

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 27, 8:07 PM EDT	Tornado Warning	MRX	Anderson, Jefferson, Knox, Loudon, McMinn, Meigs and 3 more	53 min
Apr 27, 8:10 PM EDT	Severe Thunderstorm Warning	MRX	Campbell, Claiborne, Morgan, Roane, Scott, Union	65 min
Apr 27, 8:10 PM EDT	Tornado Warning	MRX	Bradley, Hamilton	65 min
Apr 27, 8:26 PM EDT	Flash Flood Warning	MRX	Anderson, Knox, Loudon, Meigs, Rhea, Roane	3 hr
Apr 27, 8:29 PM EDT	Tornado Warning	MRX	Cocke, Grainger, Greene, Hamblen, Hawkins, Jefferson and 2 more	61 min
Apr 27, 8:29 PM EDT	Tornado Warning	MRX	Marion	61 min
Apr 27, 8:42 PM EDT	Tornado Warning	MRX	McMinn, Polk	47 min
Apr 27, 8:48 PM EDT	Tornado Warning	MRX	Blount, Knox	27 min
Apr 27, 8:53 PM EDT	Tornado Warning	MRX	Bradley, McMinn	34 min
Apr 27, 8:54 PM EDT	Severe Thunderstorm Warning	MRX	Sullivan, Washington	66 min
Apr 27, 9:00 PM EDT	Severe Thunderstorm Warning	MRX	Claiborne, Grainger, Hancock, Union	45 min
Apr 27, 9:08 PM EDT	Tornado Warning	MRX	Bledsoe, Hamilton, Rhea, Sequatchie	52 min
Apr 27, 9:15 PM EDT	Severe Thunderstorm Warning	MRX	Campbell, Morgan, Scott	45 min
Apr 27, 9:17 PM EDT	Tornado Warning	MRX	Blount, Loudon, McMinn, Monroe	43 min
Apr 27, 9:18 PM EDT	Tornado Warning	MRX	Hawkins, Sullivan, Washington	42 min
Apr 27, 9:26 PM EDT	Tornado Warning	MRX	Cocke, Greene, Hamblen, Hawkins, Jefferson, Sevier and 2 more	64 min
Apr 27, 9:37 PM EDT	Severe Thunderstorm Warning	MRX	Hancock, Hawkins	53 min
Apr 27, 9:40 PM EDT	Tornado Warning	MRX	Meigs, Rhea, Roane	50 min
Apr 27, 9:50 PM EDT	Tornado Warning	MRX	Johnson, Sullivan	55 min
Apr 27, 9:53 PM EDT	Tornado Warning	MRX	Bradley, Hamilton, McMinn, Rhea	25 min
Apr 27, 9:58 PM EDT	Tornado Warning	MRX	Blount, Cocke, Jefferson, Sevier	62 min
Apr 27, 10:03 PM EDT	Areal Flood Warning	MRX	Anderson, Bledsoe, Blount, Bradley, Campbell, Hamilton and 14 more	8 hr
Apr 27, 10:05 PM EDT	Tornado Warning	MRX	Anderson, Campbell, Claiborne, Loudon, Morgan, Scott and 1 more	40 min
Apr 27, 10:14 PM EDT	Tornado Warning	MRX	Blount, Bradley, Loudon, McMinn, Meigs, Monroe and 2 more	46 min
Apr 27, 10:24 PM EDT	Tornado Warning	MRX	Knox	51 min
Apr 27, 10:41 PM EDT	Tornado Warning	MRX	Carter, Johnson, Sullivan	64 min
Apr 27, 10:46 PM EDT	Tornado Warning	MRX	Claiborne, Grainger, Hamblen, Hancock, Hawkins, Union	59 min
Apr 27, 10:50 PM EDT	Tornado Warning	MRX	Greene, Unicoi, Washington	40 min
Apr 27, 10:52 PM EDT	Tornado Warning	MRX	Blount, Loudon, McMinn, Monroe, Polk	23 min
Apr 27, 10:57 PM EDT	Tornado Warning	MRX	Blount, Cocke, Jefferson, Sevier	63 min
Apr 27, 11:10 PM EDT	Tornado Warning	MRX	Carter, Johnson	65 min
Apr 27, 11:13 PM EDT	Tornado Warning	MRX	Blount, Knox, Loudon, Monroe	47 min
Apr 27, 11:21 PM EDT	Tornado Warning	MRX	Blount, Jefferson, Knox, Sevier	24 min
Apr 27, 11:27 PM EDT	Tornado Warning	MRX	Cocke, Greene, Jefferson, Sevier	63 min
Apr 28, 12:19 AM EDT	Severe Thunderstorm Warning	MRX	Carter, Greene, Johnson, Sullivan, Unicoi, Washington	56 min
Apr 28, 12:26 AM EDT	Severe Thunderstorm Warning	MRX	Greene	49 min
Apr 28, 12:40 AM EDT	Tornado Warning	MRX	Carter, Greene, Unicoi, Washington	31 min
Apr 28, 12:51 AM EDT	Tornado Warning	MRX	Johnson, Sullivan	39 min
Apr 28, 12:59 AM EDT	River Flood Warning	MRX	Bledsoe, Marion, Sequatchie	51 hr
Apr 28, 1:29 AM EDT	Areal Flood Advisory	MRX	Carter, Cocke, Greene, Hamblen, Hancock, Hawkins and 4 more	3 hr

Nearby

Tornado Warnings in Tennessee, 2011 Every tornado warning in 2011 Tornadoes in 2011

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.