Alert archive / Tennessee / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 113, NWS Morristown, TN

April 26, 20125 counties in Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Apr 26, 2012, 7:13 AM EDT for 5 counties in Tennessee. It was in force for 62 min. 4 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 26, 2012, 7:13 AM EDT (11:13 UTC)
Expired: Apr 26, 2012, 8:15 AM EDT
In force: 62 min
Issued by: NWS Morristown, TN
Area: Storm-based polygon

Counties Cocke County, TN, Greene County, TN, Hamblen County, TN, Hawkins County, TN, Jefferson County, TN

The radar

The Knoxville radar (KMRX), 15 km from the middle of the area, began a volume at 11:16 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 26, 7:30 AM EDT	HAIL 0.88	Dandridge, TN
Apr 26, 7:40 AM EDT	HAIL 0.25	Morristown, TN
Apr 26, 7:55 AM EDT	TSTM WND DMG	Newport, TN	SEVERAL TREES DOWN.
Apr 26, 8:00 AM EDT	TSTM WND DMG	Del Rio, TN	SEVERAL TREES DOWN.

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 26, 6:22 AM EDT	Severe Thunderstorm Watch	SPC	3 hr

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 00:00Z, 11.2 hours before the alert went out and 298 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: 1411 J/kg
Mixed-layer CIN: -108 J/kg
Mixed-layer LCL: 1242 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 250 m²/s²
0-3 km storm-relative helicity: 383 m²/s²
Significant tornado parameter: 1.3
Supercell composite: 4.7

Open this sounding in Storm Lab

The text

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

052 
WUUS54 KMRX 261113
SVRMRX
TNC029-059-063-073-089-261215-
/O.NEW.KMRX.SV.W.0113.120426T1113Z-120426T1215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MORRISTOWN TN
713 AM EDT THU APR 26 2012

THE NATIONAL WEATHER SERVICE IN MORRISTOWN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  COCKE COUNTY IN EAST TENNESSEE...
  GREENE COUNTY IN EAST TENNESSEE...
  HAMBLEN COUNTY IN EAST TENNESSEE...
  HAWKINS COUNTY IN EAST TENNESSEE...
  JEFFERSON COUNTY IN EAST TENNESSEE...

* UNTIL 815 AM EDT

* AT 712 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING PING PONG BALL
  SIZE HAIL...AND DESTRUCTIVE WINDS IN EXCESS OF 70 MPH.  THESE
  STORMS WERE LOCATED ALONG A LINE EXTENDING FROM 5 MILES EAST OF
  HARROGATE-SHAWANEE TO 8 MILES WEST OF RUTLEDGE TO 8 MILES SOUTHWEST
  OF MAYNARDVILLE...AND MOVING SOUTHEAST AT 55 MPH.

* LOCATIONS IN THE WARNING INCLUDE...
  JEFFERSON CITY...MORRISTOWN...DANDRIDGE...NEWPORT...GREENEVILLE...
  NEW MARKET...WHITE PINE...RUSSELLVILLE...PARROTTSVILLE...
  TUSCULUM...STRAWBERRY PLAINS...ALPHA...PIEDMONT...LOWLAND...
  CHESTNUT HILL...BYBEE...BULLS GAP...MOHAWK...ROMEO AND COSBY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY! LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.

&&

LAT...LON 3591 8332 3593 8349 3608 8371 3608 8366
      3613 8367 3610 8364 3614 8364 3619 8356
      3616 8348 3628 8336 3626 8328 3634 8316
      3629 8310 3638 8301 3611 8263 3592 8281
      3594 8289 3579 8296 3578 8308 3571 8325
TIME...MOT...LOC 1113Z 307DEG 48KT 3657 8354 3628 8366
          3613 8385

$$

DH

2 follow-up statements

332 
WWUS54 KMRX 261152
SVSMRX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MORRISTOWN TN
752 AM EDT THU APR 26 2012

TNC029-059-063-073-089-261215-
/O.CON.KMRX.SV.W.0113.000000T0000Z-120426T1215Z/
HAMBLEN TN-HAWKINS TN-JEFFERSON TN-COCKE TN-GREENE TN-
752 AM EDT THU APR 26 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 AM EDT
FOR GREENE...COCKE...JEFFERSON...HAWKINS AND HAMBLEN COUNTIES...

AT 748 AM 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 BULLS GAP TO NEWPORT TO 6
MILES SOUTHWEST OF CHESTNUT HILL...OR ALONG A LINE EXTENDING FROM 9
MILES SOUTHWEST OF ROGERSVILLE TO NEWPORT TO 11 MILES NORTHEAST OF
GATLINBURG...MOVING SOUTHEAST AT 55 MPH.

LOCATIONS IN THE WARNING INCLUDE...
  GREENEVILLE...PARROTTSVILLE...TUSCULUM...ROMEO...COSBY...MOSHEIM...
  CANEY BRANCH...HARTFORD...DEL RIO...CEDAR CREEK...ROUND MOUNTAIN
  AND CAMP CREEK.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...FREQUENT CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY! LIGHTNING IS ONE OF NATURES PRIMARY KILLERS ASSOCIATED
WITH THUNDERSTORMS. REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE
CLOSE ENOUGH TO BE STRUCK BY LIGHTNING.

&&

LAT...LON 3591 8332 3593 8349 3608 8371 3608 8366
      3613 8367 3610 8364 3614 8364 3619 8356
      3616 8348 3628 8336 3626 8328 3634 8316
      3629 8310 3638 8301 3611 8263 3592 8281
      3594 8289 3579 8296 3578 8308 3571 8325
TIME...MOT...LOC 1152Z 307DEG 48KT 3626 8303 3597 8315
          3582 8334

$$

DH

236 
WWUS54 KMRX 261200
SVSMRX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MORRISTOWN TN
800 AM EDT THU APR 26 2012

TNC063-089-261210-
/O.CAN.KMRX.SV.W.0113.000000T0000Z-120426T1215Z/
HAMBLEN TN-JEFFERSON TN-
800 AM EDT THU APR 26 2012

...THE SEVERE THUNDERSTORM WARNING FOR JEFFERSON AND HAMBLEN COUNTIES
IS CANCELLED...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 100 PM EDT
THURSDAY AFTERNOON FOR CENTRAL TENNESSEE AND SOUTHWEST VIRGINIA.

LAT...LON 3583 8327 3590 8332 3608 8326 3609 8323
      3612 8325 3615 8322 3613 8318 3617 8319
      3624 8308 3631 8315 3629 8324 3633 8318
      3634 8315 3629 8310 3638 8301 3611 8263
      3592 8281 3594 8289 3579 8296 3572 8325
TIME...MOT...LOC 1200Z 307DEG 48KT 3619 8292 3590 8305
          3576 8324

$$

TNC029-059-073-261215-
/O.CON.KMRX.SV.W.0113.000000T0000Z-120426T1215Z/
HAWKINS TN-COCKE TN-GREENE TN-
800 AM EDT THU APR 26 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 AM EDT
FOR GREENE...COCKE AND HAWKINS COUNTIES...

AT 800 AM EDT...A LINE OF SEVERE THUNDERSTORMS WAS REPORTED CAPABLE
OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60
MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM MOSHEIM
TO DEL RIO TO COSBY...OR ALONG A LINE EXTENDING FROM 6 MILES WEST OF
GREENEVILLE TO 9 MILES SOUTHEAST OF NEWPORT TO 14 MILES SOUTH OF
NEWPORT...MOVING SOUTHEAST AT 55 MPH.

LOCATIONS IN THE WARNING INCLUDE...
  GREENEVILLE...TUSCULUM...CANEY BRANCH...HARTFORD...DEL RIO...CEDAR
  CREEK...ROUND MOUNTAIN AND CAMP CREEK.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...FREQUENT CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY! LIGHTNING IS ONE OF NATURES PRIMARY KILLERS ASSOCIATED
WITH THUNDERSTORMS. REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE
CLOSE ENOUGH TO BE STRUCK BY LIGHTNING.

&&

LAT...LON 3583 8327 3590 8332 3608 8326 3609 8323
      3612 8325 3615 8322 3613 8318 3617 8319
      3624 8308 3631 8315 3629 8324 3633 8318
      3634 8315 3629 8310 3638 8301 3611 8263
      3592 8281 3594 8289 3579 8296 3572 8325
TIME...MOT...LOC 1200Z 307DEG 48KT 3619 8292 3590 8305
          3576 8324

$$

DH

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 26, 6:14 AM EDT	Severe Thunderstorm Warning	MRX	Anderson, Campbell, Morgan, Roane, Scott	46 min
Apr 26, 6:44 AM EDT	Severe Thunderstorm Warning	MRX	Anderson, Campbell, Claiborne, Grainger, Knox, Morgan and 2 more	46 min
Apr 26, 6:51 AM EDT	Severe Thunderstorm Warning	MRX	Hancock, Hawkins	54 min
Apr 26, 7:07 AM EDT	Severe Thunderstorm Warning	MRX	Blount, Knox, Loudon, Monroe, Roane, Sevier	53 min
Apr 26, 7:31 AM EDT	Severe Thunderstorm Warning	MRX	Grainger	14 min
Apr 26, 7:37 AM EDT	Severe Thunderstorm Warning	MRX	Bledsoe, McMinn, Meigs, Monroe, Rhea	53 min
Apr 26, 7:42 AM EDT	Severe Thunderstorm Warning	MRX	Greene, Hancock, Hawkins, Sullivan, Washington	53 min
Apr 26, 7:58 AM EDT	Severe Thunderstorm Warning	MRX	Blount, Loudon, Monroe, Roane, Sevier	47 min
Apr 26, 8:11 AM EDT	Severe Thunderstorm Warning	MRX	Carter, Johnson, Sullivan, Unicoi	46 min
Apr 26, 8:30 AM EDT	Severe Thunderstorm Warning	MRX	Bledsoe, McMinn, Meigs, Monroe, Rhea	60 min
Apr 26, 9:10 AM EDT	Severe Thunderstorm Warning	MRX	Bradley, Polk	65 min
Apr 26, 1:08 PM EDT	Severe Thunderstorm Warning	MRX	Blount, Sevier	67 min
Apr 26, 3:57 PM EDT	Severe Thunderstorm Warning	MRX	Blount	48 min
Apr 26, 4:17 PM EDT	Severe Thunderstorm Warning	MRX	Sevier	19 min
Apr 26, 4:42 PM EDT	Areal Flood Advisory	MRX	Blount, Sevier	2 hr
Apr 26, 5:06 PM EDT	Severe Thunderstorm Warning	MRX	McMinn, Monroe	54 min
Apr 26, 5:34 PM EDT	Areal Flood Advisory	MRX	McMinn, Meigs, Monroe	116 min
Apr 26, 5:54 PM EDT	Severe Thunderstorm Warning	MRX	McMinn, Monroe, Polk	66 min
Apr 26, 6:33 PM EDT	Severe Thunderstorm Warning	MRX	Bradley, Hamilton	57 min
Apr 26, 6:38 PM EDT	Severe Thunderstorm Warning	MRX	Scott	52 min
Apr 26, 7:09 PM EDT	Severe Thunderstorm Warning	MRX	Polk	42 min
Apr 26, 7:09 PM EDT	Tornado Warning	MRX	Scott	26 min
Apr 26, 7:31 PM EDT	Severe Thunderstorm Warning	MRX	Anderson, Campbell, Scott	24 min
Apr 26, 7:42 PM EDT	Areal Flood Advisory	MRX	Campbell, Scott	2 hr

Nearby

Severe Thunderstorm Warnings in Tennessee, 2012 Every severe thunderstorm warning in 2012

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.