Alert archive / Tennessee / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 9, NWS Morristown, TN

February 22, 20127 counties in Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Feb 22, 2012, 7:52 PM EST for 7 counties in Tennessee. It was in force for 38 min. 2 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 22, 2012, 7:52 PM EST (00:52 UTC)
Expired: Feb 22, 2012, 8:30 PM EST
In force: 38 min
Issued by: NWS Morristown, TN
Area: Storm-based polygon

Counties Anderson County, TN, Cocke County, TN, Grainger County, TN, Hamblen County, TN, Jefferson County, TN, Knox County, TN, Union County, TN

The radar

The Knoxville radar (KMRX), 21 km from the middle of the area, began a volume at 00:52 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 22, 8:18 PM EST	TSTM WND DMG	Blaine, TN	TREES DOWN NEAR BLAINE...REPORTED BY HIGHWAY DEPARTMENT.
Feb 22, 8:20 PM EST	HAIL 0.25	Rutledge, TN	PEA SIZED HAIL...REPORTED BY PUBLIC.

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

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 00:00Z, 0.9 hours before the alert went out and 266 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: 365 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 561 m above ground
0-6 km bulk shear: 72 kt
0-1 km storm-relative helicity: 146 m²/s²
0-3 km storm-relative helicity: 193 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 1.6

Open this sounding in Storm Lab

The text

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

447 
WUUS54 KMRX 230052
SVRMRX
TNC001-029-057-063-089-093-173-230130-
/O.NEW.KMRX.SV.W.0009.120223T0052Z-120223T0130Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MORRISTOWN TN
752 PM EST WED FEB 22 2012

THE NATIONAL WEATHER SERVICE IN MORRISTOWN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  ANDERSON COUNTY IN EAST TENNESSEE...
  COCKE COUNTY IN EAST TENNESSEE...
  GRAINGER COUNTY IN EAST TENNESSEE...
  HAMBLEN COUNTY IN EAST TENNESSEE...
  JEFFERSON COUNTY IN EAST TENNESSEE...
  KNOX COUNTY IN EAST TENNESSEE...
  UNION COUNTY IN EAST TENNESSEE...

* UNTIL 830 PM EST

* AT 748 PM EST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING PING PONG BALL SIZE
  HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
  LOCATED 5 MILES NORTHEAST OF CLINTON...AND MOVING EAST AT 45 MPH.

* LOCATIONS IN THE WARNING INCLUDE...
  MAYNARDVILLE...RUTLEDGE...JEFFERSON CITY...DANDRIDGE...
  MORRISTOWN...NEW MARKET...WHITE PINE...RUSSELLVILLE...
  PARROTTSVILLE...HALLS...NORRIS LAKE...PAULETTE...MALONEYVILLE...
  ROSE HILL...MASCOT...LUTTRELL...BLAINE...STRAWBERRY PLAINS...JOPPA
  AND BUFFALO SPRINGS.

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 3624 8308 3615 8317 3603 8299 3599 8299
      3601 8359 3604 8364 3603 8368 3601 8367
      3603 8430 3620 8427 3618 8424 3624 8422
      3623 8407 3630 8403 3627 8400 3630 8397
      3634 8326 3628 8324 3635 8316
TIME...MOT...LOC 0052Z 273DEG 50KT 3615 8401

$$

DH

1 follow-up statement

793 
WWUS54 KMRX 230110
SVSMRX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MORRISTOWN TN
810 PM EST WED FEB 22 2012

TNC001-029-057-063-089-093-173-230130-
/O.CON.KMRX.SV.W.0009.000000T0000Z-120223T0130Z/
UNION TN-ANDERSON TN-GRAINGER TN-HAMBLEN TN-JEFFERSON TN-KNOX TN-
COCKE TN-
810 PM EST WED FEB 22 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 830 PM EST
FOR COCKE...KNOX...JEFFERSON...HAMBLEN...GRAINGER...ANDERSON AND
UNION COUNTIES...

AT 806 PM EST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED NEAR BLAINE...OR 8 MILES SOUTH OF MAYNARDVILLE...MOVING EAST
AT 50 MPH.

LOCATIONS IN THE WARNING INCLUDE...
  RUTLEDGE...JEFFERSON CITY...DANDRIDGE...MORRISTOWN...NEW MARKET...
  WHITE PINE...RUSSELLVILLE...PARROTTSVILLE...STRAWBERRY PLAINS...
  JOPPA...BUFFALO SPRINGS...PIEDMONT...ALPHA...LOWLAND AND BYBEE.

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 3624 8308 3615 8317 3603 8299 3599 8299
      3601 8359 3604 8364 3603 8368 3601 8367
      3603 8430 3620 8427 3618 8424 3624 8422
      3623 8407 3630 8403 3627 8400 3630 8397
      3634 8326 3628 8324 3635 8316
TIME...MOT...LOC 0110Z 273DEG 50KT 3613 8370

$$

DH

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 22, 7:08 PM EST	Severe Thunderstorm Warning	MRX	Campbell, Claiborne, Union	37 min
Feb 22, 7:28 PM EST	Severe Thunderstorm Warning	MRX	Anderson, Campbell, Morgan, Scott	32 min
Feb 22, 7:34 PM EST	Severe Thunderstorm Warning	MRX	Anderson, Blount, Bradley, Hamilton, Knox, Loudon and 6 more	26 min
Feb 22, 7:44 PM EST	Severe Thunderstorm Warning	MRX	Claiborne, Grainger, Greene, Hancock, Hawkins	46 min
Feb 22, 8:07 PM EST	Severe Thunderstorm Warning	MRX	Cocke, Greene, Hawkins, Unicoi, Washington	38 min
Feb 22, 8:09 PM EST	Severe Thunderstorm Warning	MRX	Bledsoe, Meigs, Rhea, Roane	36 min
Feb 22, 8:20 PM EST	Severe Thunderstorm Warning	MRX	Bradley, Hamilton, McMinn, Meigs, Monroe, Polk and 1 more	40 min
Feb 22, 9:11 PM EST	Severe Thunderstorm Warning	MRX	Bradley, Hamilton, McMinn, Polk	34 min
Feb 23, 3:37 PM EST	Wind Advisory	MRX	Anderson, Bledsoe, Blount, Bradley, Campbell, Carter and 27 more	27 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.