Alert archive / Tennessee / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 67, NWS Morristown, TN

June 21, 2021Campbell County, Morgan County, Scott County, Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Jun 21, 2021, 5:05 PM EDT for Campbell County, Morgan County, Scott County, Tennessee. It was in force for 40 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: Jun 21, 2021, 5:05 PM EDT (21:05 UTC)
Expired: Jun 21, 2021, 5:45 PM EDT
In force: 40 min
Issued by: NWS Morristown, TN
Area: Storm-based polygon
Hail: 0.88 in
Wind: 70.0 mph

Counties Campbell County, TN, Morgan County, TN, Scott County, TN

The radar

The Knoxville radar (KMRX), 113 km from the middle of the area, began a volume at 21:08 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
Jun 21, 5:28 PM EDT	TSTM WND DMG	5 W Huntsville, TN	SEVERAL TREES DOWN ACROSS THE SOUTH END OF THE COUNTY.

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 12:00Z, 9.1 hours before the alert went out and 178 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: 1530 J/kg
Mixed-layer CIN: -42 J/kg
Mixed-layer LCL: 919 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 211 m²/s²
0-3 km storm-relative helicity: 228 m²/s²
Significant tornado parameter: 1.3
Supercell composite: 9.6

Open this sounding in Storm Lab

The text

As transmitted.

634 
WUUS54 KMRX 212105
SVRMRX
TNC013-129-151-212145-
/O.NEW.KMRX.SV.W.0067.210621T2105Z-210621T2145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Morristown TN
505 PM EDT Mon Jun 21 2021

The National Weather Service in Morristown has issued a

* Severe Thunderstorm Warning for...
  Northwestern Morgan County in east Tennessee...
  West central Campbell County in east Tennessee...
  Central Scott County in east Tennessee...

* Until 545 PM EDT.

* At 504 PM EDT, a severe thunderstorm was located 10 miles southwest
  of Helenwood, or 13 miles southeast of Jamestown, moving east at 45
  mph.

  HAZARD...70 mph wind gusts and nickel size hail.

  SOURCE...Radar indicated.

  IMPACT...Expect considerable tree damage. Damage is likely to 
           mobile homes, roofs, and outbuildings.

* Locations impacted include...
  Oneida, Huntsville, Helenwood, Rugby, Elk Valley, Rugby State Park,
  Honey Creek State Park, Royal Blue, Norma and Elgin.

This includes Interstate 75 in Tennessee between mile markers 143 and
151.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3647 8415 3628 8441 3626 8485 3629 8485
      3630 8480 3633 8477 3633 8476 3634 8474
      3635 8474 3635 8473 3637 8472 3637 8470
      3640 8466 3644 8469 3650 8472 3651 8444
TIME...MOT...LOC 2104Z 268DEG 38KT 3636 8471 

HAIL...0.88IN
WIND...70MPH
 
$$

Garuckas

1 follow-up statement

854 
WWUS54 KMRX 212123
SVSMRX

Severe Weather Statement
National Weather Service Morristown TN
523 PM EDT Mon Jun 21 2021

TNC129-212132-
/O.CAN.KMRX.SV.W.0067.000000T0000Z-210621T2145Z/
Morgan TN-
523 PM EDT Mon Jun 21 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN MORGAN COUNTY IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

LAT...LON 3647 8415 3628 8441 3627 8459 3628 8459
      3627 8461 3629 8463 3630 8463 3651 8459
      3651 8443
TIME...MOT...LOC 2122Z 262DEG 38KT 3642 8448 

$$

TNC013-151-212145-
/O.CON.KMRX.SV.W.0067.000000T0000Z-210621T2145Z/
Campbell TN-Scott TN-
523 PM EDT Mon Jun 21 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM EDT
FOR WEST CENTRAL CAMPBELL AND CENTRAL SCOTT COUNTIES...

At 522 PM EDT, a severe thunderstorm was located over Huntsville, or
7 miles south of Oneida, moving east at 45 mph.

HAZARD...70 mph wind gusts and nickel size hail.

SOURCE...Radar indicated.

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings.

Locations impacted include...
Oneida, Huntsville, Helenwood, Elk Valley, Royal Blue, Norma, Elgin,
Robbins and Slick Rock.

This includes Interstate 75 in Tennessee between mile markers 143 and
151.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3647 8415 3628 8441 3627 8459 3628 8459
      3627 8461 3629 8463 3630 8463 3651 8459
      3651 8443
TIME...MOT...LOC 2122Z 262DEG 38KT 3642 8448 

HAIL...0.88IN
WIND...70MPH
 
$$

Garuckas

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 21, 4:21 PM EDT	Special Weather Statement	MRX	Morgan	39 min
Jun 21, 4:29 PM EDT	Severe Thunderstorm Warning	MRX	Campbell, Morgan	46 min
Jun 21, 4:40 PM EDT	Special Weather Statement	MRX	Grainger	50 min
Jun 21, 4:48 PM EDT	Special Weather Statement	MRX	Union	42 min
Jun 21, 4:55 PM EDT	Severe Thunderstorm Warning	MRX	Anderson, Campbell, Morgan, Roane, Scott	65 min
Jun 21, 5:01 PM EDT	Special Weather Statement	MRX	Claiborne	44 min
Jun 21, 5:08 PM EDT	Severe Thunderstorm Warning	MRX	Grainger, Hancock, Hawkins	67 min
Jun 21, 5:12 PM EDT	Severe Thunderstorm Warning	MRX	Campbell, Claiborne, Union	48 min
Jun 21, 5:29 PM EDT	Severe Thunderstorm Warning	MRX	Campbell, Grainger, Knox, Union	46 min
Jun 21, 5:34 PM EDT	Special Weather Statement	MRX	Bradley, Hamilton, Marion, Sequatchie	41 min
Jun 21, 5:36 PM EDT	Severe Thunderstorm Warning	MRX	Grainger, Jefferson, Knox	39 min
Jun 21, 5:42 PM EDT	Severe Thunderstorm Warning	MRX	Campbell, Claiborne	48 min
Jun 21, 5:46 PM EDT	Special Weather Statement	MRX	Loudon	44 min
Jun 21, 5:53 PM EDT	Severe Thunderstorm Warning	MRX	Hancock	41 min
Jun 21, 5:57 PM EDT	Severe Thunderstorm Warning	MRX	Claiborne, Grainger, Hancock	48 min
Jun 21, 6:02 PM EDT	Severe Thunderstorm Warning	MRX	Blount, Loudon, McMinn, Monroe, Roane	43 min
Jun 21, 6:02 PM EDT	Severe Thunderstorm Warning	MRX	Claiborne, Cocke, Grainger, Greene, Hamblen, Hawkins and 1 more	58 min
Jun 21, 6:05 PM EDT	Special Weather Statement	MRX	McMinn	40 min
Jun 21, 6:25 PM EDT	Special Weather Statement	MRX	Bradley, McMinn	65 min
Jun 21, 6:33 PM EDT	Special Weather Statement	MRX	Anderson	57 min
Jun 21, 6:50 PM EDT	Severe Thunderstorm Warning	MRX	Blount, Monroe	40 min
Jun 21, 6:54 PM EDT	Severe Thunderstorm Warning	MRX	Blount, Knox, Sevier	51 min
Jun 21, 7:19 PM EDT	Severe Thunderstorm Warning	MRX	Morgan, Rhea, Roane	56 min
Jun 21, 7:41 PM EDT	Severe Thunderstorm Warning	MRX	Anderson, Blount, Knox, Loudon, Morgan, Roane	49 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.