Alert archive / Tennessee / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 49, NWS Morristown, TN

April 4, 2011Anderson County, Campbell County, Roane County, Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Apr 4, 2011, 5:00 PM EDT for Anderson County, Campbell County, Roane County, Tennessee. It was in force for 60 min. 3 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: Apr 4, 2011, 5:00 PM EDT (21:00 UTC)
Expired: Apr 4, 2011, 6:00 PM EDT
In force: 60 min
Issued by: NWS Morristown, TN
Area: Storm-based polygon

Counties Anderson County, TN, Campbell County, TN, Roane County, TN

The radar

The Knoxville radar (KMRX), 82 km from the middle of the area, began a volume at 21:01 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 4, 5:30 PM EDT	TSTM WND DMG	Harriman, TN	NUMEROUS TREES DOWN.
Apr 4, 5:30 PM EDT	TSTM WND DMG	Rockwood, TN	SEVERAL TREES DOWN.
Apr 4, 6:00 PM EDT	TSTM WND DMG	Clinton, TN	NUMEROUS TREES DOWN COUNTY WIDE.

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
Apr 4, 3:05 PM EDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 9.0 hours before the alert went out and 205 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: 68 J/kg
Mixed-layer CIN: -640 J/kg
Mixed-layer LCL: 855 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 370 m²/s²
0-3 km storm-relative helicity: 507 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.

513 
WUUS54 KMRX 042100
SVRMRX
TNC001-013-145-042200-
/O.NEW.KMRX.SV.W.0049.110404T2100Z-110404T2200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MORRISTOWN TN
500 PM EDT MON APR 4 2011

THE NATIONAL WEATHER SERVICE IN MORRISTOWN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  ANDERSON COUNTY IN EAST TENNESSEE...
  CAMPBELL COUNTY IN EAST TENNESSEE...
  ROANE COUNTY IN EAST TENNESSEE...

* UNTIL 600 PM EDT

* AT 454 PM EDT/354 PM CDT/...NATIONAL WEATHER SERVICE DOPPLER RADAR
  INDICATED A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING
  QUARTER SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE
  STORMS WERE LOCATED ALONG A LINE EXTENDING FROM ONEIDA TO 11 MILES
  NORTH OF PIKEVILLE...AND MOVING EAST AT 70 MPH.

* LOCATIONS IN THE WARNING INCLUDE...
  ROCKWOOD...KINGSTON...LA FOLLETTE...OAK RIDGE...CLINTON...
  JACKSBORO...OLIVER SPRINGS...ELK VALLEY...JELLICO...EAGLE
  FURNACE...ROYAL BLUE...FAIRVIEW...WHITE OAK...PAINT ROCK...
  CARYVILLE...ROSEDALE...HARRIMAN...DEARMOND...FINCASTLE AND
  BRADBURY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM EDT MONDAY
EVENING FOR SOUTHWEST NORTH CAROLINA AND CENTRAL TENNESSEE AND
SOUTHWEST VIRGINIA.

&&

LAT...LON 3659 8399 3640 8390 3640 8395 3627 8401
      3622 8398 3600 8412 3594 8426 3578 8438
      3565 8461 3572 8463 3570 8467 3575 8474
      3583 8478 3591 8470 3605 8434 3615 8445
      3628 8433 3646 8435 3652 8426 3660 8426
TIME...MOT...LOC 2100Z 250DEG 60KT 3658 8433 3579 8506

$$

MJB

1 follow-up statement

402 
WWUS54 KMRX 042135
SVSMRX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MORRISTOWN TN
535 PM EDT MON APR 4 2011

TNC001-013-145-042200-
/O.CON.KMRX.SV.W.0049.000000T0000Z-110404T2200Z/
ROANE TN-ANDERSON TN-CAMPBELL TN-
535 PM EDT MON APR 4 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM EDT
FOR CAMPBELL...ANDERSON AND ROANE COUNTIES...

AT 530 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER
SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS
WERE LOCATED ALONG A LINE EXTENDING FROM WHITE OAK TO EAGLE
FURNACE...OR ALONG A LINE EXTENDING FROM 14 MILES WEST OF MIDDLESBORO
TO 8 MILES SOUTH OF ROCKWOOD...MOVING EAST AT 70 MPH.

LOCATIONS IN THE WARNING INCLUDE...
  KINGSTON...OAK RIDGE...CLINTON...OLIVER SPRINGS...FAIRVIEW...LAKE
  CITY...PAINT ROCK...BRADBURY AND NORRIS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM EDT MONDAY
EVENING FOR SOUTHWEST NORTH CAROLINA AND CENTRAL TENNESSEE AND
SOUTHWEST VIRGINIA.

&&

LAT...LON 3659 8399 3640 8390 3640 8395 3627 8401
      3622 8398 3600 8412 3594 8426 3578 8438
      3565 8461 3572 8463 3570 8467 3575 8474
      3583 8478 3591 8470 3605 8434 3615 8445
      3628 8433 3646 8435 3652 8426 3660 8426
TIME...MOT...LOC 2135Z 250DEG 60KT 3658 8385 3579 8459

$$

MJB

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 3, 9:42 PM EDT	High Wind Warning	MRX	Blount, Cocke, Greene, Sevier	26 hr
Apr 4, 3:14 PM EDT	Severe Thunderstorm Warning	MRX	Grainger, Greene, Hamblen, Hancock, Hawkins, Jefferson and 2 more	61 min
Apr 4, 4:33 PM EDT	Severe Thunderstorm Warning	MRX	Morgan, Scott	57 min
Apr 4, 4:45 PM EDT	Severe Thunderstorm Warning	MRX	Bledsoe, Hamilton, Marion, Meigs, Rhea, Roane and 1 more	60 min
Apr 4, 4:48 PM EDT	Tornado Warning	MRX	Morgan, Scott	42 min
Apr 4, 5:22 PM EDT	Severe Thunderstorm Warning	MRX	Morgan, Scott	23 min
Apr 4, 5:30 PM EDT	Severe Thunderstorm Warning	MRX	Claiborne, Union	60 min
Apr 4, 5:43 PM EDT	Severe Thunderstorm Warning	MRX	Knox, Loudon	62 min
Apr 4, 5:44 PM EDT	Severe Thunderstorm Warning	MRX	Bledsoe, Bradley, Hamilton, Loudon, McMinn, Marion and 4 more	61 min
Apr 4, 5:54 PM EDT	Severe Thunderstorm Warning	MRX	Anderson, Campbell, Roane	51 min
Apr 4, 6:03 PM EDT	Areal Flood Advisory	MRX	Anderson, Bledsoe, Blount, Bradley, Hamilton, Jefferson and 12 more	117 min
Apr 4, 6:07 PM EDT	Severe Thunderstorm Warning	MRX	Grainger, Hamblen, Hancock, Hawkins	53 min
Apr 4, 6:09 PM EDT	Tornado Warning	MRX	Bradley, Hamilton, McMinn, Meigs	36 min
Apr 4, 6:19 PM EDT	Areal Flood Advisory	MRX	Anderson, Claiborne, Cocke, Grainger, Greene, Hamblen and 7 more	3 hr
Apr 4, 6:24 PM EDT	Severe Thunderstorm Warning	MRX	Blount, Jefferson, Sevier	66 min
Apr 4, 6:33 PM EDT	Severe Thunderstorm Warning	MRX	Blount, Bradley, Hamilton, McMinn, Monroe, Polk	57 min
Apr 4, 6:37 PM EDT	Tornado Warning	MRX	Blount, McMinn, Monroe	23 min
Apr 4, 6:40 PM EDT	Severe Thunderstorm Warning	MRX	Knox, Loudon	35 min
Apr 4, 6:50 PM EDT	Severe Thunderstorm Warning	MRX	Cocke, Greene, Hamblen, Hawkins	55 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 2011 Every severe thunderstorm warning 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.