Alert archive / Tennessee / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 113, NWS Morristown, TN

August 11, 2021McMinn County, Monroe County, Polk County, Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Aug 11, 2021, 5:28 PM EDT for McMinn County, Monroe County, Polk County, Tennessee. It was in force for 47 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 11, 2021, 5:28 PM EDT (21:28 UTC)
Expired: Aug 11, 2021, 6:15 PM EDT
In force: 47 min
Issued by: NWS Morristown, TN
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties McMinn County, TN, Monroe County, TN, Polk County, TN

The radar

The Northeast Alabama radar (KHTX), 144 km from the middle of the area, began a volume at 21:31 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 11, 5:50 PM EDT	TSTM WND DMG	3 Wsw Archville, TN	REPORTS OF TREES DOWN ACROSS THE PARKSVILLE CAMPGROUND AREA.

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

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 9.5 hours before the alert went out and 207 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: 1000 J/kg
Mixed-layer CIN: -72 J/kg
Mixed-layer LCL: 1034 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: -16 m²/s²
0-3 km storm-relative helicity: 17 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

123 
WUUS54 KMRX 112128
SVRMRX
TNC107-123-139-112215-
/O.NEW.KMRX.SV.W.0113.210811T2128Z-210811T2215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Morristown TN
528 PM EDT Wed Aug 11 2021

The National Weather Service in Morristown has issued a

* Severe Thunderstorm Warning for...
  Northeastern Polk County in east Tennessee...
  Southeastern McMinn County in east Tennessee...
  Southwestern Monroe County in east Tennessee...

* Until 615 PM EDT.

* At 527 PM EDT, a severe thunderstorm was located near Benton, and
  is nearly stationary.

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

  SOURCE...Law enforcement. Multiple trees down were reported in and 
           near Charleston. 

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Benton, Etowah, Englewood, Bullet Creek, Reliance, Archville,
  Hiwassee Ocoee State Park and Dentville.

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 3511 8462 3533 8472 3545 8444 3516 8430
TIME...MOT...LOC 2127Z 250DEG 4KT 3518 8458 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

BW

2 follow-up statements

208 
WWUS54 KMRX 112152
SVSMRX

Severe Weather Statement
National Weather Service Morristown TN
552 PM EDT Wed Aug 11 2021

TNC107-123-112202-
/O.CAN.KMRX.SV.W.0113.000000T0000Z-210811T2215Z/
McMinn TN-Monroe TN-
552 PM EDT Wed Aug 11 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN MCMINN AND
SOUTHWESTERN MONROE COUNTIES IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

LAT...LON 3525 8468 3527 8467 3527 8452 3528 8450
      3528 8449 3526 8442 3515 8437 3511 8462
TIME...MOT...LOC 2152Z 250DEG 4KT 3519 8455 

$$

TNC139-112215-
/O.CON.KMRX.SV.W.0113.000000T0000Z-210811T2215Z/
Polk TN-
552 PM EDT Wed Aug 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM EDT
FOR NORTHEASTERN POLK COUNTY...

At 552 PM EDT, a severe thunderstorm was located near Benton, and is
nearly stationary.

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

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
Benton, Reliance, Archville and Hiwassee Ocoee State Park. 

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 3525 8468 3527 8467 3527 8452 3528 8450
      3528 8449 3526 8442 3515 8437 3511 8462
TIME...MOT...LOC 2152Z 250DEG 4KT 3519 8455 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

BW

271 
WWUS54 KMRX 112213
SVSMRX

Severe Weather Statement
National Weather Service Morristown TN
613 PM EDT Wed Aug 11 2021

TNC139-112223-
/O.EXP.KMRX.SV.W.0113.000000T0000Z-210811T2215Z/
Polk TN-
613 PM EDT Wed Aug 11 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN POLK COUNTY WILL
EXPIRE AT 615 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.  However small hail
and gusty winds are still possible with this thunderstorm.

Remember, a Severe Thunderstorm Warning still remains in effect for
south central Polk County until 630 PM EDT. 

LAT...LON 3525 8468 3527 8467 3527 8452 3528 8450
      3528 8449 3526 8442 3515 8437 3511 8462
TIME...MOT...LOC 2213Z 250DEG 4KT 3520 8453 

$$

BW

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 11, 8:20 AM EDT	Special Weather Statement	MRX	Bradley	25 min
Aug 11, 2:44 PM EDT	Special Weather Statement	MRX	Loudon	46 min
Aug 11, 2:46 PM EDT	Special Weather Statement	MRX	Union	44 min
Aug 11, 2:49 PM EDT	Special Weather Statement	MRX	Marion	41 min
Aug 11, 3:14 PM EDT	Special Weather Statement	MRX	McMinn	31 min
Aug 11, 3:44 PM EDT	Special Weather Statement	MRX	McMinn	31 min
Aug 11, 3:59 PM EDT	Special Weather Statement	MRX	Morgan	31 min
Aug 11, 4:09 PM EDT	Special Weather Statement	MRX	Hamilton	36 min
Aug 11, 4:11 PM EDT	Special Weather Statement	MRX	Roane	34 min
Aug 11, 4:19 PM EDT	Special Weather Statement	MRX	McMinn	26 min
Aug 11, 4:30 PM EDT	Special Weather Statement	MRX	Bradley	30 min
Aug 11, 4:32 PM EDT	Special Weather Statement	MRX	Morgan	28 min
Aug 11, 4:41 PM EDT	Severe Thunderstorm Warning	MRX	Bradley, McMinn, Polk	49 min
Aug 11, 5:03 PM EDT	Special Weather Statement	MRX	McMinn	27 min
Aug 11, 5:23 PM EDT	Special Weather Statement	MRX	Polk	37 min
Aug 11, 5:50 PM EDT	Severe Thunderstorm Warning	MRX	Polk	40 min
Aug 11, 6:11 PM EDT	Special Weather Statement	MRX	Jefferson	34 min
Aug 11, 6:17 PM EDT	Areal Flood Advisory	MRX	Polk	118 min
Aug 11, 6:20 PM EDT	Special Weather Statement	MRX	Sevier	25 min
Aug 11, 6:27 PM EDT	Severe Thunderstorm Warning	MRX	Sevier	25 min
Aug 11, 6:48 PM EDT	Special Weather Statement	MRX	Jefferson	42 min
Aug 11, 7:07 PM EDT	Special Weather Statement	MRX	Sullivan	23 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.