Alert archive / Tennessee / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 21, NWS Morristown, TN

February 18, 2009Campbell County, Scott County, Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Feb 18, 2009, 2:29 PM EST for Campbell County, Scott County, Tennessee. It was in force for 61 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 18, 2009, 2:29 PM EST (19:29 UTC)
Expired: Feb 18, 2009, 3:30 PM EST
In force: 61 min
Issued by: NWS Morristown, TN
Area: Storm-based polygon

Counties Campbell County, TN, Scott County, TN

The radar

The Knoxville radar (KMRX), 103 km from the middle of the area, began a volume at 19:30 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 18, 2:50 PM EST	HAIL 1	Big South Fork National, TN	ONE INCH HAIL AT BIG SOUTH FORK NAT. PARK. REPORTED BY PARK RANGER.
Feb 18, 3:10 PM EST	HAIL 0.75	Jellico, TN	PENNY SIZE HAIL NEAR JELLICO. REPORTED BY CAMPBALL CO. HIGHWAY DEPT.

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 18, 12:09 PM EST	Tornado Watch	SPC	6 hr

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 7.5 hours before the alert went out and 194 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 519 m above ground
0-6 km bulk shear: 78 kt
0-1 km storm-relative helicity: 599 m²/s²
0-3 km storm-relative helicity: 631 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.

000 
WUUS54 KMRX 181929
SVRMRX
TNC013-151-182030-
/O.NEW.KMRX.SV.W.0021.090218T1929Z-090218T2030Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MORRISTOWN TN
229 PM EST WED FEB 18 2009

THE NATIONAL WEATHER SERVICE IN MORRISTOWN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CAMPBELL COUNTY IN EAST TENNESSEE...
  THIS INCLUDES THE CITY OF LA FOLLETTE...
  SCOTT COUNTY IN EAST TENNESSEE...
  THIS INCLUDES THE CITY OF ONEIDA...

* UNTIL 330 PM EST

* AT 224 PM EST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING NICKEL SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 23
  MILES WEST OF ONEIDA...OR 8 MILES NORTH OF JAMESTOWN...AND MOVING
  EAST AT 50 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  ONEIDA BY 250 PM EST...

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. IF A TORNADO
IS SPOTTED... ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A STURDY
STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM.

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 PRIMARY KILLERS. REMEMBER...
IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY
LIGHTNING.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 600 PM EST WEDNESDAY EVENING 
FOR THE PLATEAU.

LAT...LON 3660 8401 3658 8400 3628 8402 3635 8468
      3638 8470 3641 8467 3645 8470 3651 8472
      3660 8479 3661 8477 3661 8468
TIME...MOT...LOC 1928Z 265DEG 48KT 3656 8486

$$

DH

1 follow-up statement

000 
WWUS54 KMRX 181957
SVSMRX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MORRISTOWN TN
257 PM EST WED FEB 18 2009

TNC013-151-182030-
/O.CON.KMRX.SV.W.0021.000000T0000Z-090218T2030Z/
CAMPBELL TN-SCOTT TN-
258 PM EST WED FEB 18 2009

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM EST
FOR SCOTT AND CAMPBELL COUNTIES...

AT 255 PM EST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING NICKEL
SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS
WERE LOCATED ALONG A LINE EXTENDING FROM WINFIELD TO BIG SOUTH FORK
NATIONAL REFUGE...OR ALONG A LINE EXTENDING FROM 7 MILES NORTHEAST OF
ONEIDA TO 13 MILES WEST OF ONEIDA...MOVING EAST AT 55 MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
  HUNTSVILLE...WINFIELD AND ONEIDA BY 310 PM EST...
  NORMA AND KETCHEN BY 315 PM EST...
  ROYAL BLUE BY 320 PM EST...
  JACKSBORO...CARYVILLE...JELLICO AND ELK VALLEY BY 325 PM EST...

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. IF A TORNADO
IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A STURDY
STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM.

LAT...LON 3660 8401 3658 8400 3628 8402 3635 8468
      3638 8470 3641 8467 3645 8470 3651 8472
      3660 8479 3661 8477 3661 8468
TIME...MOT...LOC 1956Z 269DEG 48KT 3660 8443 3656 8473

$$

DMG

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 18, 3:46 AM EST	High Wind Warning	MRX	Blount, Cocke, Greene, Sevier	14 hr
Feb 18, 2:37 PM EST	Tornado Warning	MRX	Morgan, Roane	38 min
Feb 18, 3:07 PM EST	Severe Thunderstorm Warning	MRX	Bledsoe, Loudon, Meigs, Rhea, Roane	38 min
Feb 18, 3:10 PM EST	Severe Thunderstorm Warning	MRX	Anderson, Knox, Loudon, Roane	50 min
Feb 18, 3:18 PM EST	Severe Thunderstorm Warning	MRX	Bledsoe, Hamilton, McMinn, Meigs, Monroe, Rhea	57 min
Feb 18, 3:18 PM EST	Severe Thunderstorm Warning	MRX	Campbell, Claiborne, Hancock	57 min
Feb 18, 3:25 PM EST	Severe Thunderstorm Warning	MRX	Bradley, Hamilton, Marion, Meigs, Sequatchie	65 min
Feb 18, 3:25 PM EST	Severe Thunderstorm Warning	MRX	Anderson, Campbell, Morgan, Scott	65 min
Feb 18, 4:06 PM EST	Severe Thunderstorm Warning	MRX	Cocke, Greene, Jefferson	39 min
Feb 18, 4:08 PM EST	Tornado Warning	MRX	Blount, McMinn, Monroe	37 min
Feb 18, 4:13 PM EST	Severe Thunderstorm Warning	MRX	McMinn, Monroe, Polk	32 min
Feb 18, 4:36 PM EST	Severe Thunderstorm Warning	MRX	Greene, Unicoi, Washington	39 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 2009 Every severe thunderstorm warning in 2009

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.