Alert archive / Tennessee / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 147, NWS Morristown, TN

December 11, 2021Campbell County, Claiborne County, Scott County, Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Dec 11, 2021, 8:23 AM EST for Campbell County, Claiborne County, Scott County, Tennessee. It was in force for 37 min. 1 report 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: Dec 11, 2021, 8:23 AM EST (13:23 UTC)
Expired: Dec 11, 2021, 9:00 AM EST
In force: 37 min
Issued by: NWS Morristown, TN
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Campbell County, TN, Claiborne County, TN, Scott County, TN

The radar

The Knoxville radar (KMRX), 66 km from the middle of the area, began a volume at 13:27 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
Dec 11, 8:40 AM EST	TSTM WND DMG	Jellico, TN	FEW 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
Dec 11, 4:41 AM EST	Tornado Watch	SPC	6 hr

The nearest sounding before it

Cncnati-Daytn, OH (KILN), launched 12:00Z, 1.4 hours before the alert went out and 322 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: 7 J/kg
Mixed-layer CIN: -56 J/kg
Mixed-layer LCL: 761 m above ground
0-6 km bulk shear: 70 kt
0-1 km storm-relative helicity: 205 m²/s²
0-3 km storm-relative helicity: 205 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

257 
WUUS54 KMRX 111323 RRA
SVRMRX
TNC013-025-151-111400-
/O.NEW.KMRX.SV.W.0147.211211T1323Z-211211T1400Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Morristown TN
823 AM EST Sat Dec 11 2021

The National Weather Service in Morristown has issued a

* Severe Thunderstorm Warning for...
  Northwestern Claiborne County in east Tennessee...
  Northern Campbell County in east Tennessee...
  Northeastern Scott County in east Tennessee...

* Until 900 AM EST.

* At 823 AM EST, severe thunderstorms were located along a line
  extending from Zion Hill to near Huntsville, moving northeast at 65
  mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Locations impacted include...
  Huntsville, Jellico, Elk Valley, Ketchen, Indian Mountain State
  Park, Clairfield and White Oak.

This includes Interstate 75 in Tennessee between mile markers 146 and
161.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until noon EST for east Tennessee.

For your protection move to an interior room on the lowest floor of a
building.

A Tornado Watch remains in effect until noon EST for east Tennessee.

&&

LAT...LON 3658 8369 3636 8453 3659 8430 3659 8368
TIME...MOT...LOC 1323Z 246DEG 57KT 3661 8425 3641 8444 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

DGS

2 follow-up statements

528 
WWUS54 KMRX 111335
SVSMRX

Severe Weather Statement
National Weather Service Morristown TN
835 AM EST Sat Dec 11 2021

TNC151-111344-
/O.CAN.KMRX.SV.W.0147.000000T0000Z-211211T1400Z/
Scott TN-
835 AM EST Sat Dec 11 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN SCOTT COUNTY IS
CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

A Tornado Watch remains in effect until noon EST for east Tennessee.

LAT...LON 3659 8368 3658 8369 3645 8435 3651 8433
      3650 8428 3651 8426 3653 8425 3659 8426
TIME...MOT...LOC 1334Z 246DEG 57KT 3668 8406 3648 8425 

$$

TNC013-025-111400-
/O.CON.KMRX.SV.W.0147.000000T0000Z-211211T1400Z/
Claiborne TN-Campbell TN-
835 AM EST Sat Dec 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 AM EST
FOR NORTHWESTERN CLAIBORNE AND NORTHERN CAMPBELL COUNTIES...

At 834 AM EST, severe thunderstorms were located along a line
extending from Packard to 9 miles south of Zion Hill, moving
northeast at 65 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Jellico, White Oak, Elk Valley, Indian Mountain State Park and
Clairfield.

This includes Interstate 75 in Tennessee between mile markers 151 and
161.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of 
a building.

&&

LAT...LON 3659 8368 3658 8369 3645 8435 3651 8433
      3650 8428 3651 8426 3653 8425 3659 8426
TIME...MOT...LOC 1334Z 246DEG 57KT 3668 8406 3648 8425 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

DGS

696 
WWUS54 KMRX 111351
SVSMRX

Severe Weather Statement
National Weather Service Morristown TN
851 AM EST Sat Dec 11 2021

TNC013-025-111401-
/O.EXP.KMRX.SV.W.0147.000000T0000Z-211211T1400Z/
Claiborne TN-Campbell TN-
851 AM EST Sat Dec 11 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN CLAIBORNE AND
NORTHERN CAMPBELL COUNTIES WILL EXPIRE AT 900 AM EST...
    
The storms which prompted the warning have weakened below severe
limits, and have exited the warned area. Therefore, the warning will
be allowed to expire.

A Tornado Watch remains in effect until noon EST for east Tennessee.

LAT...LON 3659 8368 3658 8369 3645 8435 3651 8433
      3650 8428 3651 8426 3653 8425 3659 8426
TIME...MOT...LOC 1351Z 246DEG 57KT 3679 8376 3659 8395 

$$

DGS

The office that day

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

Issued	Product	Office	Counties	Lasted
Dec 11, 5:57 AM EST	Severe Thunderstorm Warning	MRX	Campbell, Scott	48 min
Dec 11, 6:39 AM EST	Severe Thunderstorm Warning	MRX	Campbell, Scott	51 min
Dec 11, 7:29 AM EST	Severe Thunderstorm Warning	MRX	Campbell, Scott	46 min
Dec 11, 7:43 AM EST	Flash Flood Warning	MRX	Scott	4 hr
Dec 11, 7:51 AM EST	Special Weather Statement	MRX	Campbell, Morgan	54 min
Dec 11, 8:23 AM EST	Severe Thunderstorm Warning	MRX	Marion, Sequatchie	52 min
Dec 11, 9:02 AM EST	Severe Thunderstorm Warning	MRX	Bledsoe, Bradley, Hamilton, McMinn, Meigs, Rhea and 1 more	43 min
Dec 11, 9:18 AM EST	Special Weather Statement	MRX	Hamilton	42 min
Dec 11, 9:18 AM EST	Severe Thunderstorm Warning	MRX	Bledsoe, Meigs, Rhea, Roane	42 min
Dec 11, 9:34 AM EST	Severe Thunderstorm Warning	MRX	Bradley, Hamilton, Marion	41 min
Dec 11, 9:44 AM EST	Severe Thunderstorm Warning	MRX	Bradley, Loudon, McMinn, Meigs, Monroe, Roane	46 min
Dec 11, 9:51 AM EST	Severe Thunderstorm Warning	MRX	Anderson, Blount, Knox, Loudon, Roane	39 min
Dec 11, 10:15 AM EST	Severe Thunderstorm Warning	MRX	Bradley, McMinn, Monroe, Polk	45 min
Dec 11, 10:21 AM EST	Severe Thunderstorm Warning	MRX	Blount, Grainger, Jefferson, Knox, Sevier	39 min
Dec 11, 10:25 AM EST	Severe Thunderstorm Warning	MRX	Blount, Loudon, McMinn, Monroe	50 min
Dec 11, 10:30 AM EST	Special Weather Statement	MRX	Bradley	45 min
Dec 11, 10:53 AM EST	Severe Thunderstorm Warning	MRX	Cocke, Grainger, Greene, Hamblen, Hawkins, Jefferson	35 min
Dec 11, 10:59 AM EST	Special Weather Statement	MRX	Polk	46 min
Dec 11, 10:59 AM EST	Severe Thunderstorm Warning	MRX	Blount, Cocke, Jefferson, Sevier	30 min
Dec 11, 11:28 AM EST	Special Weather Statement	MRX	Sullivan	47 min
Dec 11, 11:49 AM EST	Special Weather Statement	MRX	Carter, Johnson, Washington	41 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 2021 Every severe thunderstorm warning in 2021

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.