Alert archive / Tennessee / Tornado Warnings in 2011

Tornado Warning 4, NWS Morristown, TN

February 28, 2011Hamilton County, Marion County, Sequatchie County, Tennessee

NWS Morristown, TN issued this tornado warning at Feb 28, 2011, 1:48 PM EST for Hamilton County, Marion County, Sequatchie County, Tennessee. It was in force for 42 min. 7 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Feb 28, 2011, 1:48 PM EST (18:48 UTC)
Expired: Feb 28, 2011, 2:30 PM EST
In force: 42 min
Issued by: NWS Morristown, TN
Area: Storm-based polygon

Counties Hamilton County, TN, Marion County, TN, Sequatchie County, TN

The radar

The Northeast Alabama radar (KHTX), 66 km from the middle of the area, began a volume at 18:51 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.

What was reported inside it

Time	Report	Where	Remark
Feb 28, 2:00 PM EST	TSTM WND DMG	1 N Jasper, TN	FEW TREES DOWN.
Feb 28, 2:00 PM EST	TORNADO	1 W South Pittsburg, TN	EF0. MAXIMUM WIND SPEED 70 MPH. PATH WIDTH 20 YARDS. PATH LENGTH 0.1 MILE. TREES DOWN.
Feb 28, 2:25 PM EST	TSTM WND DMG	Chattanooga, TN	FEW TREES DOWN NEAR INTERSECTION OF HOOKER AND WILSON ROADS.
Feb 28, 2:25 PM EST	TORNADO	Signal Mountain, TN	EF1. MAX WIND SPEED 90 MPH. PATH LENGTH 2.2 MILES. PATH WIDTH FROM 60 TO 90 YARDS. NUMEROUS TREES DOWN. ESTIMATED 25 HOMES WITH MINOR DAMAGE.
Feb 28, 2:30 PM EST	TSTM WND DMG	Red Bank, TN	FEW TREES DOWN ON A HOUSE.
Feb 28, 2:30 PM EST	TSTM WND DMG	Signal Mountain, TN	NUMEROUS TREES AND POWER LINES DOWN AND 8 HOMES WITH DAMAGE RANGING FROM MINOR TO MAJOR BETWEEN SIGNAL MOUNTAIN AND REDBANK.
Feb 28, 2:30 PM EST	TORNADO	2 N Red Bank, TN	EF1. MAX WIND SPEED 85 MPH. PATH LENGTH 2.6 MILES. AVERAGE PATH WIDTH 85 TO 100 YARDS WITH A MAXIMUM WIDTH OF 150 YARDS. NUMEROUS TREES DOWN. AT LEAST 10 HOMES WITH DAMAGE.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

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

Issued	Product	Office	Lasted
Feb 28, 1:29 PM EST	Tornado Watch	SPC	7 hr

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 6.8 hours before the alert went out and 149 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: 948 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 795 m above ground
0-6 km bulk shear: 65 kt
0-1 km storm-relative helicity: 369 m²/s²
0-3 km storm-relative helicity: 404 m²/s²
Significant tornado parameter: 2.6
Supercell composite: 9.4

Open this sounding in Storm Lab

The text

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

495 
WFUS54 KMRX 281848
TORMRX
TNC065-115-153-281930-
/O.NEW.KMRX.TO.W.0004.110228T1848Z-110228T1930Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE MORRISTOWN TN
1248 PM CST MON FEB 28 2011

THE NATIONAL WEATHER SERVICE IN MORRISTOWN HAS ISSUED A

* TORNADO WARNING FOR...
  HAMILTON COUNTY IN EAST TENNESSEE...
  MARION COUNTY IN EAST TENNESSEE...
  SEQUATCHIE COUNTY IN EAST TENNESSEE...

* UNTIL 130 PM CST/230 PM EST/

* AT 1246 PM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 13 MILES SOUTH
  OF SEWANEE...OR 15 MILES WEST OF BRIDGEPORT. DOPPLER RADAR SHOWED
  THIS TORNADO MOVING EAST AT 65 MPH.

* LOCATIONS IN THE WARNING INCLUDE...
  JASPER...CHATTANOOGA...MONTEAGLE...SOUTH PITTSBURG...WHITWELL...
  SIGNAL MOUNTAIN...SODDY-DAISY...HARRISON...ORME...HALETOWN
  (GUILD)...MARTIN SPRINGS...POWELLS CROSSROADS...CARTWRIGHT...LONE
  OAK...RED BANK...MIDDLE VALLEY...EAST BRAINERD...SHADY GROVE...
  OOLTEWAH AND COLLEGEDALE.

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 700 PM CST MONDAY EVENING/800
PM EST MONDAY EVENING/ FOR SOUTHWEST NORTH CAROLINA AND CENTRAL
TENNESSEE.

&&

LAT...LON 3522 8587 3524 8585 3525 8581 3523 8574
      3527 8570 3537 8498 3536 8496 3525 8495
      3516 8501 3504 8500 3503 8496 3499 8498
      3499 8588 3518 8588
TIME...MOT...LOC 1848Z 263DEG 63KT 3502 8592

$$

1 follow-up statement

206 
WWUS54 KMRX 281908
SVSMRX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MORRISTOWN TN
208 PM EST MON FEB 28 2011

TNC065-115-153-281930-
/O.CON.KMRX.TO.W.0004.000000T0000Z-110228T1930Z/
SEQUATCHIE TN-HAMILTON TN-MARION TN-
208 PM EST MON FEB 28 2011

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 230 PM EST/130 PM CST/
FOR MARION...HAMILTON AND SEQUATCHIE COUNTIES...

AT 104 PM CST/204 PM EST/...NATIONAL WEATHER SERVICE DOPPLER RADAR 
CONTINUED TO INDICATE A CIRCULATION THAT COULD BE A TORNADO.  THIS 
CIRCULATION WAS LOCATED NEAR JASPER...MOVING EAST AT 65 MPH.

LOCATIONS IN THE WARNING INCLUDE...
  CHATTANOOGA...WHITWELL...SIGNAL MOUNTAIN...SODDY-DAISY...
  HARRISON...MARTIN SPRINGS...HALETOWN (GUILD)...POWELLS
  CROSSROADS...CARTWRIGHT...LONE OAK...RED BANK...MIDDLE VALLEY...
  SHADY GROVE...EAST BRAINERD...OOLTEWAH...COLLEGEDALE AND BIRCHWOOD.

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.

&&

LAT...LON 3499 8584 3516 8570 3529 8556 3537 8498
      3536 8496 3526 8495 3516 8501 3504 8500
      3503 8497 3499 8498
TIME...MOT...LOC 1906Z 271DEG 58KT 3506 8557

$$

GM

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 27, 8:21 PM EST	Dense Fog Advisory	MRX	Anderson, Blount, Campbell, Carter, Claiborne, Cocke and 17 more	8 hr
Feb 28, 8:38 AM EST	Severe Thunderstorm Warning	MRX	Campbell, Scott	52 min
Feb 28, 9:28 AM EST	Severe Thunderstorm Warning	MRX	Anderson, Campbell, Claiborne, Hancock, Scott, Union	47 min
Feb 28, 10:00 AM EST	Severe Thunderstorm Warning	MRX	Anderson, Campbell, Morgan, Scott	30 min
Feb 28, 10:15 AM EST	River Flood Warning	MRX	Claiborne, Grainger, Hancock	47 hr
Feb 28, 10:15 AM EST	River Flood Warning	MRX	Sevier	17 hr
Feb 28, 10:15 AM EST	River Flood Warning	MRX	Claiborne, Hancock	27 hr
Feb 28, 10:26 AM EST	Areal Flood Advisory	MRX	Morgan, Scott	3 hr
Feb 28, 10:40 AM EST	Severe Thunderstorm Warning	MRX	Campbell, Claiborne, Hancock, Union	50 min
Feb 28, 10:56 AM EST	Areal Flood Warning	MRX	Anderson, Campbell, Claiborne, Morgan, Scott, Union	6 hr
Feb 28, 11:15 AM EST	Severe Thunderstorm Warning	MRX	Bledsoe, Rhea	45 min
Feb 28, 12:23 PM EST	Severe Thunderstorm Warning	MRX	Anderson, Knox	37 min
Feb 28, 12:48 PM EST	Tornado Warning	MRX	Anderson, Blount, Cocke, Jefferson, Knox, Sevier	42 min
Feb 28, 1:02 PM EST	Areal Flood Warning	MRX	Blount, Cocke, Grainger, Greene, Hamblen, Hancock and 8 more	12 hr
Feb 28, 1:17 PM EST	Tornado Warning	MRX	Cocke, Grainger, Greene, Hamblen, Hawkins, Jefferson and 1 more	25 min
Feb 28, 1:43 PM EST	Severe Thunderstorm Warning	MRX	Bledsoe, Hamilton, Marion, Meigs, Rhea, Sequatchie	32 min
Feb 28, 2:22 PM EST	Tornado Warning	MRX	Bradley, Hamilton	38 min
Feb 28, 2:33 PM EST	Severe Thunderstorm Warning	MRX	Bradley, Hamilton, McMinn, Meigs, Monroe, Rhea	42 min
Feb 28, 2:47 PM EST	Tornado Warning	MRX	Bradley, Monroe, Polk	43 min
Feb 28, 3:08 PM EST	Severe Thunderstorm Warning	MRX	Blount, Monroe	37 min
Feb 28, 4:42 PM EST	Areal Flood Warning	MRX	Anderson, Campbell, Claiborne, Grainger, Hancock, Knox 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.