Alert archive / Tennessee / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 21, NWS Morristown, TN

March 27, 2021Unicoi County, Washington County, Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Mar 27, 2021, 11:11 AM EDT for Unicoi County, Washington County, Tennessee. It was in force for 35 min. 6 reports 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
Mar 27, 2021, 11:11 AM EDT (15:11 UTC)
Expired
Mar 27, 2021, 11:46 AM EDT
In force
35 min
Issued by
NWS Morristown, TN
Area
Storm-based polygon
Hail
1.5 in
Wind
50.0 mph

Counties Unicoi County, TN, Washington County, TN

The radar

The Knoxville radar (KMRX), 90 km from the middle of the area, began a volume at 15:10 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
Mar 27, 11:22 AM EDTHAIL 0.252 Se Avondale, TN
Mar 27, 11:30 AM EDTHAIL 0.88Johnson City, TN
Mar 27, 11:30 AM EDTHAIL 1.5Johnson City, TNTVA CREDIT UNION STADIUM.
Mar 27, 11:31 AM EDTHAIL 1.253 Se Avondale, TNREPORT FROM MPING: HALF DOLLAR (1.25 IN.).
Mar 27, 11:42 AM EDTHAIL 0.72 Se Avondale, TN
Mar 27, 11:43 AM EDTHAIL 1.53 Se Avondale, TNREPORT FROM MPING: PING PONG BALL (1.50 IN.).

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

The nearest sounding before it

Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 3.2 hours before the alert went out and 226 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, Greensboro/Hi Pt, NC 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.LCL10008507005003002001001 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, Greensboro/Hi Pt, NC at 12:00Z on 2021-03-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 60 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
2434 m above ground
0-6 km bulk shear
53 kt
0-1 km storm-relative helicity
60 m²/s²
0-3 km storm-relative helicity
145 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

060 
WUUS54 KMRX 271511
SVRMRX
TNC171-179-271600-
/O.NEW.KMRX.SV.W.0021.210327T1511Z-210327T1600Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Morristown TN
1111 AM EDT Sat Mar 27 2021

The National Weather Service in Morristown has issued a

* Severe Thunderstorm Warning for...
  Washington County in east Tennessee...
  Northern Unicoi County in east Tennessee...

* Until noon EDT.

* At 1110 AM EDT, a severe thunderstorm was located near Tusculum, or
  8 miles east of Greeneville, moving east at 45 mph.

  HAZARD...Ping pong ball size hail.

  SOURCE...Radar indicated.

  IMPACT...People and animals outdoors will be injured. Expect 
           damage to roofs, siding, windows, and vehicles.

* Locations impacted include...
  Johnson City, Erwin, Jonesborough, Midway, Pine Crest, Central,
  Unicoi, Watauga, Leesburg and Limestone.

This includes Interstate 26 in Tennessee between mile markers 17 and
25, and between mile markers 29 and 36.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3613 8263 3614 8264 3621 8265 3629 8264
      3640 8239 3641 8238 3639 8238 3640 8237
      3640 8230 3636 8230 3625 8234 3626 8230
      3623 8226 3621 8227 3621 8224 3618 8223
TIME...MOT...LOC 1510Z 254DEG 38KT 3619 8266 

HAIL...1.50IN
WIND...<50MPH
 
$$

Garuckas
3 follow-up statements
502 
WWUS54 KMRX 271516
SVSMRX

Severe Weather Statement
National Weather Service Morristown TN
1116 AM EDT Sat Mar 27 2021

TNC171-179-271600-
/O.CON.KMRX.SV.W.0021.000000T0000Z-210327T1600Z/
Washington TN-Unicoi TN-
1116 AM EDT Sat Mar 27 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL NOON EDT FOR
WASHINGTON AND NORTHERN UNICOI COUNTIES...

At 1116 AM EDT, a severe thunderstorm was located 8 miles southwest
of Jonesborough, or 10 miles northwest of Erwin, moving east at 45
mph.

HAZARD...Golf ball size hail.

SOURCE...Radar indicated.

IMPACT...People and animals outdoors will be injured. Expect damage 
         to roofs, siding, windows, and vehicles.

Locations impacted include...
Johnson City, Erwin, Jonesborough, Midway, Pine Crest, Central,
Unicoi, Watauga, Leesburg and Limestone.

This includes Interstate 26 in Tennessee between mile markers 17 and
25, and between mile markers 29 and 36.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3613 8263 3614 8264 3621 8265 3629 8264
      3640 8239 3641 8238 3639 8238 3640 8237
      3640 8230 3636 8230 3625 8234 3626 8230
      3623 8226 3621 8227 3621 8224 3618 8223
TIME...MOT...LOC 1516Z 254DEG 38KT 3621 8258 

HAIL...1.75IN
WIND...<50MPH
 
$$

Garuckas
633 
WWUS54 KMRX 271536
SVSMRX

Severe Weather Statement
National Weather Service Morristown TN
1136 AM EDT Sat Mar 27 2021

TNC171-271545-
/O.CAN.KMRX.SV.W.0021.000000T0000Z-210327T1600Z/
Unicoi TN-
1136 AM EDT Sat Mar 27 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN UNICOI 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 3627 8240 3636 8248 3637 8247 3640 8239
      3641 8238 3639 8238 3640 8237 3640 8230
      3636 8230 3628 8233
TIME...MOT...LOC 1535Z 248DEG 44KT 3632 8230 

$$

TNC179-271600-
/O.CON.KMRX.SV.W.0021.000000T0000Z-210327T1600Z/
Washington TN-
1136 AM EDT Sat Mar 27 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL NOON EDT FOR
NORTHEASTERN WASHINGTON COUNTY...

At 1135 AM EDT, a severe thunderstorm was located over Central, or
near Elizabethton, moving east at 50 mph.

HAZARD...Ping pong ball size hail.

SOURCE...Radar indicated.

IMPACT...People and animals outdoors will be injured. Expect damage 
         to roofs, siding, windows, and vehicles.

Locations impacted include...
Johnson City, Midway, Pine Crest, Central and Watauga. 

This includes Interstate 26 in Tennessee between mile markers 17 and
25.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3627 8240 3636 8248 3637 8247 3640 8239
      3641 8238 3639 8238 3640 8237 3640 8230
      3636 8230 3628 8233
TIME...MOT...LOC 1535Z 248DEG 44KT 3632 8230 

HAIL...1.50IN
WIND...<50MPH
 
$$

Garuckas
465 
WWUS54 KMRX 271546
SVSMRX

Severe Weather Statement
National Weather Service Morristown TN
1146 AM EDT Sat Mar 27 2021

TNC179-271556-
/O.CAN.KMRX.SV.W.0021.000000T0000Z-210327T1600Z/
Washington TN-
1146 AM EDT Sat Mar 27 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN WASHINGTON 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 3627 8240 3636 8248 3637 8247 3640 8239
      3641 8238 3639 8238 3640 8237 3640 8230
      3636 8230 3628 8233
TIME...MOT...LOC 1545Z 254DEG 38KT 3635 8216 

$$

Garuckas

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, 10:33 AM EDTSevere Thunderstorm WarningMRXCampbell, Claiborne42 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, 11:20 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.