Alert archive / Tennessee / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 122, NWS Morristown, TN

August 14, 2021Claiborne County, Union County, Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Aug 14, 2021, 6:38 PM EDT for Claiborne County, Union 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: Aug 14, 2021, 6:38 PM EDT (22:38 UTC)
Expired: Aug 14, 2021, 7:15 PM EDT
In force: 37 min
Issued by: NWS Morristown, TN
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Claiborne County, TN, Union County, TN

The radar

The Knoxville radar (KMRX), 41 km from the middle of the area, began a volume at 22:39 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
Aug 14, 6:45 PM EDT	TSTM WND DMG	1 W Sandlick, TN	1 TREE DOWN IN ROADWAY.

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, 10.6 hours before the alert went out and 258 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: 250 J/kg
Mixed-layer CIN: -90 J/kg
Mixed-layer LCL: 966 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: -9 m²/s²
0-3 km storm-relative helicity: 29 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

846 
WUUS54 KMRX 142238
SVRMRX
TNC025-173-142315-
/O.NEW.KMRX.SV.W.0122.210814T2238Z-210814T2315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Morristown TN
638 PM EDT Sat Aug 14 2021

The National Weather Service in Morristown has issued a

* Severe Thunderstorm Warning for...
  South central Claiborne County in east Tennessee...
  Northeastern Union County in east Tennessee...

* Until 715 PM EDT.

* At 638 PM EDT, a severe thunderstorm was located near New Tazewell,
  or 11 miles northeast of Maynardville, and is nearly stationary.

  HAZARD...60 mph wind gusts and penny size hail.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  New Tazewell, Springdale and Sandlick. 

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 3645 8361 3637 8362 3635 8381 3639 8382
      3640 8383 3643 8382 3651 8379
TIME...MOT...LOC 2238Z 082DEG 2KT 3639 8371 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Garuckas

2 follow-up statements

822 
WWUS54 KMRX 142300
SVSMRX

Severe Weather Statement
National Weather Service Morristown TN
700 PM EDT Sat Aug 14 2021

TNC025-173-142315-
/O.CON.KMRX.SV.W.0122.000000T0000Z-210814T2315Z/
Claiborne TN-Union TN-
700 PM EDT Sat Aug 14 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM EDT
FOR SOUTH CENTRAL CLAIBORNE AND NORTHEASTERN UNION COUNTIES...

At 700 PM EDT, a severe thunderstorm was located 7 miles southwest of
New Tazewell, or 10 miles northeast of Maynardville, and is nearly
stationary.

HAZARD...60 mph wind gusts and penny size hail.

SOURCE...Radar indicated.

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

Locations impacted include...
Springdale and Sandlick. 

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 3645 8366 3638 8367 3635 8381 3639 8382
      3640 8383 3643 8382 3651 8379
TIME...MOT...LOC 2300Z 082DEG 2KT 3639 8373 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Garuckas

486 
WWUS54 KMRX 142308
SVSMRX

Severe Weather Statement
National Weather Service Morristown TN
708 PM EDT Sat Aug 14 2021

TNC025-173-142317-
/O.EXP.KMRX.SV.W.0122.000000T0000Z-210814T2315Z/
Claiborne TN-Union TN-
708 PM EDT Sat Aug 14 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL CLAIBORNE AND
NORTHEASTERN UNION COUNTIES WILL EXPIRE AT 715 PM EDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.

LAT...LON 3645 8366 3638 8367 3635 8381 3639 8382
      3640 8383 3643 8382 3651 8379
TIME...MOT...LOC 2307Z 082DEG 2KT 3639 8373 

$$

Garuckas

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 13, 8:00 PM EDT	Severe Thunderstorm Warning	MRX	Cocke, Jefferson, Sevier	45 min
Aug 13, 8:32 PM EDT	Severe Thunderstorm Warning	MRX	Cocke, Greene	29 min
Aug 13, 8:44 PM EDT	Special Weather Statement	MRX	Hawkins	46 min
Aug 13, 9:23 PM EDT	Severe Thunderstorm Warning	MRX	Hawkins, Sullivan	52 min
Aug 13, 10:19 PM EDT	Areal Flood Advisory	MRX	Hawkins, Sullivan	116 min
Aug 14, 2:44 PM EDT	Special Weather Statement	MRX	Scott	46 min
Aug 14, 3:38 PM EDT	Special Weather Statement	MRX	Campbell	37 min
Aug 14, 5:48 PM EDT	Special Weather Statement	MRX	Rhea	27 min
Aug 14, 5:57 PM EDT	Severe Thunderstorm Warning	MRX	Johnson, Sullivan	33 min
Aug 14, 6:07 PM EDT	Special Weather Statement	MRX	Sequatchie	38 min
Aug 14, 6:27 PM EDT	Special Weather Statement	MRX	Claiborne	48 min
Aug 14, 6:31 PM EDT	Special Weather Statement	MRX	Claiborne	44 min
Aug 14, 6:43 PM EDT	Special Weather Statement	MRX	Hancock	47 min
Aug 14, 6:53 PM EDT	Severe Thunderstorm Warning	MRX	Claiborne	37 min
Aug 14, 7:03 PM EDT	Special Weather Statement	MRX	Grainger	42 min
Aug 14, 7:24 PM EDT	Special Weather Statement	MRX	Knox	51 min
Aug 14, 7:33 PM EDT	Special Weather Statement	MRX	Bradley	27 min
Aug 14, 7:41 PM EDT	Special Weather Statement	MRX	Blount	49 min
Aug 14, 7:48 PM EDT	Severe Thunderstorm Warning	MRX	Monroe	27 min
Aug 14, 7:57 PM EDT	Severe Thunderstorm Warning	MRX	Knox, Sevier	33 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.