Alert archive / Tennessee / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 75, NWS Morristown, TN

June 21, 20215 counties in Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Jun 21, 2021, 6:02 PM EDT for 5 counties in Tennessee. It was in force for 43 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, 6:02 PM EDT (22:02 UTC)
Expired
Jun 21, 2021, 6:45 PM EDT
In force
43 min
Issued by
NWS Morristown, TN
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Blount County, TN, Loudon County, TN, McMinn County, TN, Monroe County, TN, Roane County, TN

The radar

The Knoxville radar (KMRX), 79 km from the middle of the area, began a volume at 22:02 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

TimeReportWhereRemark
Jun 21, 6:35 PM EDTTSTM WND DMG4 Wnw Vonore, TNSEVERAL TREES DOWN ACROSS NORTHERN MONROE 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, 10.0 hours before the alert went out and 225 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-pSkew-T log-p diagram, Nashville Metro, TN at 12:00Z on 2021-06-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1530 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Nashville Metro, TN at 12:00Z on 2021-06-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 211 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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.

235 
WUUS54 KMRX 212202
SVRMRX
TNC009-105-107-123-145-212245-
/O.NEW.KMRX.SV.W.0075.210621T2202Z-210621T2245Z/

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

The National Weather Service in Morristown has issued a

* Severe Thunderstorm Warning for...
  Loudon County in east Tennessee...
  Northeastern McMinn County in east Tennessee...
  Western Blount County in east Tennessee...
  Northern Monroe County in east Tennessee...
  Southeastern Roane County in east Tennessee...

* Until 645 PM EDT.

* At 602 PM EDT, a severe thunderstorm was located over Sweetwater,
  moving east at 35 mph.

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

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Maryville, Lenoir City, Alcoa, Sweetwater, Loudon, Madisonville,
  Louisville, Rockford, Eagleton Village and Vonore.

This includes Interstate 75 in Tennessee between mile markers 56 and
80.
 
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 3551 8457 3575 8459 3584 8420 3579 8414
      3585 8414 3583 8412 3585 8408 3583 8406
      3585 8405 3584 8402 3585 8401 3587 8403
      3588 8399 3586 8398 3587 8395 3555 8379
TIME...MOT...LOC 2202Z 259DEG 29KT 3562 8448 

HAIL...0.75IN
WIND...60MPH
 
$$

Garuckas
2 follow-up statements
794 
WWUS54 KMRX 212220
SVSMRX

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

TNC107-145-212230-
/O.CAN.KMRX.SV.W.0075.000000T0000Z-210621T2245Z/
McMinn TN-Roane TN-
620 PM EDT Mon Jun 21 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN MCMINN AND
SOUTHEASTERN ROANE 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 3577 8439 3580 8438 3584 8420 3579 8414
      3585 8414 3583 8412 3585 8408 3583 8406
      3585 8405 3584 8402 3585 8401 3587 8402
      3588 8399 3586 8398 3587 8395 3555 8379
      3552 8435
TIME...MOT...LOC 2220Z 261DEG 35KT 3564 8427 

$$

TNC009-105-123-212245-
/O.CON.KMRX.SV.W.0075.000000T0000Z-210621T2245Z/
Loudon TN-Blount TN-Monroe TN-
620 PM EDT Mon Jun 21 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM EDT
FOR LOUDON...WESTERN BLOUNT AND NORTHEASTERN MONROE COUNTIES...

At 620 PM EDT, a severe thunderstorm was located 8 miles southeast of
Loudon, moving east at 40 mph.

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

SOURCE...Radar indicated.

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

Locations impacted include...
Maryville, Lenoir City, Alcoa, Loudon, Madisonville, Louisville,
Rockford, Eagleton Village, Vonore and Greenback.

This includes Interstate 75 in Tennessee between mile markers 73 and
80.
 
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 3577 8439 3580 8438 3584 8420 3579 8414
      3585 8414 3583 8412 3585 8408 3583 8406
      3585 8405 3584 8402 3585 8401 3587 8402
      3588 8399 3586 8398 3587 8395 3555 8379
      3552 8435
TIME...MOT...LOC 2220Z 261DEG 35KT 3564 8427 

HAIL...0.75IN
WIND...60MPH
 
$$

Garuckas
301 
WWUS54 KMRX 212242
SVSMRX

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

TNC009-105-123-212252-
/O.EXP.KMRX.SV.W.0075.000000T0000Z-210621T2245Z/
Loudon TN-Blount TN-Monroe TN-
642 PM EDT Mon Jun 21 2021

...THE SEVERE THUNDERSTORM WARNING FOR LOUDON...WESTERN BLOUNT AND
NORTHEASTERN MONROE COUNTIES WILL EXPIRE AT 645 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 3577 8439 3580 8438 3584 8420 3579 8414
      3585 8414 3583 8412 3585 8408 3583 8406
      3585 8405 3584 8402 3585 8401 3587 8402
      3588 8399 3586 8398 3587 8395 3555 8379
      3552 8435
TIME...MOT...LOC 2242Z 259DEG 29KT 3567 8409 

$$

Garuckas

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 21, 4:21 PM EDTSpecial Weather StatementMRXMorgan39 min
Jun 21, 4:29 PM EDTSevere Thunderstorm WarningMRXCampbell, Morgan46 min
Jun 21, 4:40 PM EDTSpecial Weather StatementMRXGrainger50 min
Jun 21, 4:48 PM EDTSpecial Weather StatementMRXUnion42 min
Jun 21, 4:55 PM EDTSevere Thunderstorm WarningMRXAnderson, Campbell, Morgan, Roane, Scott65 min
Jun 21, 5:01 PM EDTSpecial Weather StatementMRXClaiborne44 min
Jun 21, 5:05 PM EDTSevere Thunderstorm WarningMRXCampbell, Morgan, Scott40 min
Jun 21, 5:08 PM EDTSevere Thunderstorm WarningMRXGrainger, Hancock, Hawkins67 min
Jun 21, 5:12 PM EDTSevere Thunderstorm WarningMRXCampbell, Claiborne, Union48 min
Jun 21, 5:29 PM EDTSevere Thunderstorm WarningMRXCampbell, Grainger, Knox, Union46 min
Jun 21, 5:34 PM EDTSpecial Weather StatementMRXBradley, Hamilton, Marion, Sequatchie41 min
Jun 21, 5:36 PM EDTSevere Thunderstorm WarningMRXGrainger, Jefferson, Knox39 min
Jun 21, 5:42 PM EDTSevere Thunderstorm WarningMRXCampbell, Claiborne48 min
Jun 21, 5:46 PM EDTSpecial Weather StatementMRXLoudon44 min
Jun 21, 5:53 PM EDTSevere Thunderstorm WarningMRXHancock41 min
Jun 21, 5:57 PM EDTSevere Thunderstorm WarningMRXClaiborne, Grainger, Hancock48 min
Jun 21, 6:02 PM EDTSevere Thunderstorm WarningMRXClaiborne, Cocke, Grainger, Greene, Hamblen, Hawkins and 1 more58 min
Jun 21, 6:05 PM EDTSpecial Weather StatementMRXMcMinn40 min
Jun 21, 6:25 PM EDTSpecial Weather StatementMRXBradley, McMinn65 min
Jun 21, 6:33 PM EDTSpecial Weather StatementMRXAnderson57 min
Jun 21, 6:50 PM EDTSevere Thunderstorm WarningMRXBlount, Monroe40 min
Jun 21, 6:54 PM EDTSevere Thunderstorm WarningMRXBlount, Knox, Sevier51 min
Jun 21, 7:19 PM EDTSevere Thunderstorm WarningMRXMorgan, Rhea, Roane56 min
Jun 21, 7:41 PM EDTSevere Thunderstorm WarningMRXAnderson, Blount, Knox, Loudon, Morgan, Roane49 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 2021Every 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.