Alert archive / Tennessee / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 18, NWS Morristown, TN

March 27, 2021Campbell County, Claiborne County, Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Mar 27, 2021, 10:33 AM EDT for Campbell County, Claiborne County, Tennessee. It was in force for 42 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Mar 27, 2021, 10:33 AM EDT (14:33 UTC)
Expired
Mar 27, 2021, 11:15 AM EDT
In force
42 min
Issued by
NWS Morristown, TN
Area
Storm-based polygon
Hail
1.25 in
Wind
60.0 mph

Counties Campbell County, TN, Claiborne County, TN

The radar

The Knoxville radar (KMRX), 69 km from the middle of the area, began a volume at 14:33 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.

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 2.6 hours before the alert went out and 234 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 2021-03-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Nashville Metro, TN at 12:00Z on 2021-03-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 347 square meters per square second.19395878Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
710 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
347 m²/s²
0-3 km storm-relative helicity
316 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

224 
WUUS54 KMRX 271433 RRA
SVRMRX
TNC013-025-271515-
/O.NEW.KMRX.SV.W.0018.210327T1433Z-210327T1515Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Morristown TN
1033 AM EDT Sat Mar 27 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...

* Until 1115 AM EDT.

* At 1033 AM EDT, a severe thunderstorm was located near La Follette,
  moving northeast at 55 mph.

  HAZARD...60 mph wind gusts and half dollar size hail.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  La Follette, Jacksboro, Jellico, Caryville, Elk Valley, Indian
  Mountain State Park, Clairfield and White Oak.

This includes Interstate 75 in Tennessee between mile markers 141 and
161.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3659 8386 3658 8383 3634 8420 3643 8431
      3659 8414
TIME...MOT...LOC 1433Z 225DEG 48KT 3646 8417 

HAIL...1.25IN
WIND...60MPH
 
$$

Diegan
1 follow-up statement
947 
WWUS54 KMRX 271443
SVSMRX

Severe Weather Statement
National Weather Service Morristown TN
1043 AM EDT Sat Mar 27 2021

TNC013-025-271515-
/O.CON.KMRX.SV.W.0018.000000T0000Z-210327T1515Z/
Claiborne TN-Campbell TN-
1043 AM EDT Sat Mar 27 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1115 AM EDT
FOR NORTHWESTERN CLAIBORNE AND NORTHEASTERN CAMPBELL COUNTIES...

At 1042 AM EDT, a severe thunderstorm was located near Lot, or 12
miles north of La Follette, moving northeast at 55 mph.

HAZARD...60 mph wind gusts and half dollar size hail.

SOURCE...Radar indicated.

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

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

This includes Interstate 75 in Tennessee between mile markers 157 and
161.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3659 8386 3658 8383 3641 8410 3648 8418
      3659 8414
TIME...MOT...LOC 1442Z 225DEG 48KT 3655 8406 

HAIL...1.25IN
WIND...60MPH
 
$$

Diegan

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 27, 5:03 AM EDTSpecial Weather StatementMRXMarion, Sequatchie42 min
Mar 27, 5:23 AM EDTSevere Thunderstorm WarningMRXBledsoe, Hamilton, Marion, Sequatchie39 min
Mar 27, 5:47 AM EDTSpecial Weather StatementMRXHamilton43 min
Mar 27, 6:08 AM EDTSevere Thunderstorm WarningMRXBradley, Hamilton52 min
Mar 27, 6:41 AM EDTSevere Thunderstorm WarningMRXBradley, Polk49 min
Mar 27, 7:46 AM EDTSpecial Weather StatementMRXRoane44 min
Mar 27, 7:58 AM EDTSevere Thunderstorm WarningMRXMorgan47 min
Mar 27, 8:27 AM EDTSpecial Weather StatementMRXScott48 min
Mar 27, 8:37 AM EDTSpecial Weather StatementMRXKnox38 min
Mar 27, 8:42 AM EDTSevere Thunderstorm WarningMRXScott26 min
Mar 27, 8:58 AM EDTSpecial Weather StatementMRXKnox, Loudon47 min
Mar 27, 9:18 AM EDTSevere Thunderstorm WarningMRXGrainger, Knox, Union42 min
Mar 27, 9:39 AM EDTSevere Thunderstorm WarningMRXKnox, Sevier30 min
Mar 27, 9:43 AM EDTSevere Thunderstorm WarningMRXClaiborne, Grainger, Hancock, Hawkins47 min
Mar 27, 10:00 AM EDTSevere Thunderstorm WarningMRXCocke, Hamblen, Jefferson45 min
Mar 27, 10:06 AM EDTSevere Thunderstorm WarningMRXCampbell, Scott54 min
Mar 27, 10:14 AM EDTSpecial Weather StatementMRXAnderson, Campbell, Morgan, Scott46 min
Mar 27, 10:30 AM EDTSpecial Weather StatementMRXHawkins45 min
Mar 27, 10:33 AM EDTSevere Thunderstorm WarningMRXGreene42 min
Mar 27, 10:36 AM EDTFlash Flood WarningMRXMorgan, Scott4 hr
Mar 27, 10:41 AM EDTSevere Thunderstorm WarningMRXHawkins49 min
Mar 27, 10:51 AM EDTSpecial Weather StatementMRXAnderson, Morgan39 min
Mar 27, 11:00 AM EDTSpecial Weather StatementMRXClaiborne45 min
Mar 27, 11:07 AM EDTSevere Thunderstorm WarningMRXSullivan38 min
Mar 27, 11:11 AM EDTSevere Thunderstorm WarningMRXUnicoi, Washington35 min
Mar 27, 11:20 AM EDTSpecial Weather StatementMRXGrainger, Hamblen, Union40 min
Mar 27, 11:30 AM EDTSevere Thunderstorm WarningMRXClaiborne, Hancock22 min
Mar 27, 11:32 AM EDTSevere Thunderstorm WarningMRXCarter, Johnson, Sullivan, Unicoi, Washington43 min
Mar 27, 11:45 AM EDTAreal Flood AdvisoryMRXHawkins, Sullivan3 hr
Mar 27, 11:46 AM EDTSpecial Weather StatementMRXHamblen, Jefferson44 min
Mar 27, 11:48 AM EDTAreal Flood AdvisoryMRXCampbell, Claiborne3 hr
Mar 27, 11:50 AM EDTAreal Flood AdvisoryMRXCarter, Greene, Washington3 hr
Mar 27, 11:56 AM EDTSpecial Weather StatementMRXMonroe49 min
Mar 27, 12:07 PM EDTAreal Flood AdvisoryMRXAnderson, Knox3 hr
Mar 27, 12:12 PM EDTAreal Flood AdvisoryMRXClaiborne, Hancock3 hr
Mar 27, 12:17 PM EDTSpecial Weather StatementMRXJohnson43 min
Mar 27, 12:23 PM EDTSpecial Weather StatementMRXHawkins52 min
Mar 27, 1:01 PM EDTSevere Thunderstorm WarningMRXCarter, Johnson, Sullivan, Unicoi, Washington44 min
Mar 27, 3:13 PM EDTWind AdvisoryMRXBlount, Carter, Cocke, Greene, Johnson, Monroe and 2 more23 hr
Mar 27, 3:34 PM EDTSpecial Weather StatementMRXCampbell, Morgan41 min
Mar 27, 5:05 PM EDTAreal Flood WarningMRXAnderson, Campbell, Claiborne, Morgan, Scott, Union3 hr
Mar 27, 5:38 PM EDTAreal Flood WarningMRXClaiborne, Grainger, Hancock, Hawkins, Union3 hr
Mar 27, 5:49 PM EDTSpecial Weather StatementMRXAnderson, Morgan41 min
Mar 27, 6:13 PM EDTAreal Flood WarningMRXBlount, Sevier3 hr
Mar 27, 6:59 PM EDTSpecial Weather StatementMRXMorgan, Scott46 min
Mar 27, 7:02 PM EDTSpecial Weather StatementMRXMarion, Sequatchie43 min
Mar 27, 7:15 PM EDTSevere Thunderstorm WarningMRXCampbell, Scott45 min
Mar 27, 7:34 PM EDTSpecial Weather StatementMRXHancock41 min
Mar 27, 7:36 PM EDTSpecial Weather StatementMRXMeigs39 min
Mar 27, 7:40 PM EDTSpecial Weather StatementMRXCampbell, Scott50 min
Mar 27, 7:43 PM EDTSevere Thunderstorm WarningMRXMarion47 min
Mar 27, 7:52 PM EDTSpecial Weather StatementMRXCampbell53 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.