Alert archive / Tennessee / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 73, NWS Morristown, TN

June 15, 2020Sevier County, Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Jun 15, 2020, 1:25 PM EDT for Sevier County, Tennessee. It was in force for 50 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jun 15, 2020, 1:25 PM EDT (17:25 UTC)
Expired
Jun 15, 2020, 2:15 PM EDT
In force
50 min
Issued by
NWS Morristown, TN
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

County Sevier County, TN

The radar

The Knoxville radar (KMRX), 44 km from the middle of the area, began a volume at 17:27 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

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 5.4 hours before the alert went out and 283 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, Peachtre/Fal Fld, GA at 12:00Z on 2020-06-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 31 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, Peachtre/Fal Fld, GA at 12:00Z on 2020-06-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 37 square meters per square second.1939587897Sfc1 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
31 J/kg
Mixed-layer CIN
-197 J/kg
Mixed-layer LCL
1314 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
37 m²/s²
0-3 km storm-relative helicity
107 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Morristown, TN wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 15, 10:13 AM EDT, 3 hours 12 minutes earlier.

Area forecast discussion, Jun 15, 10:13 AM EDT, 3 hours 12 minutes before
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Hazardous weather outlook, Jun 15, 2:52 AM EDT, 10 hours 33 minutes before
Hazardous Weather Outlook
National Weather Service Morristown TN
252 AM EDT Mon Jun 15 2020

NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002-
005-006-008-160700-
Cherokee-Clay-Scott-Campbell-Claiborne-Hancock-Hawkins-Sullivan-
Johnson-Morgan-Anderson-Union-Grainger-Hamblen-Northwest Cocke-
Cocke Smoky Mountains-Northwest Greene-Southeast Greene-
Washington-Unicoi-Northwest Carter-Southeast Carter-Roane-Loudon-
Knox-Jefferson-Northwest Blount-Blount Smoky Mountains-
North Sevier-Sevier Smoky Mountains-Sequatchie-Bledsoe-Rhea-Meigs-
McMinn-Northwest Monroe-Southeast Monroe-Marion-Hamilton-Bradley-
West Polk-East Polk-Lee-Wise-Russell-
252 AM EDT Mon Jun 15 2020 /152 AM CDT Mon Jun 15 2020/

This Hazardous Weather Outlook is for portions of southwest North
Carolina...east Tennessee and southwest Virginia.

.DAY ONE...Today and Tonight

Scattered thunderstorms will develop this afternoon. Some of
these storms could be strong and produce small hail and gusty
winds. The area with the greatest risk for strong storms will be
along the Southern Appalachian Mountains this afternoon.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not anticipated at this time.

In the hours before

Special weather statement, Jun 15, 11:23 AM EDT, 2 hours 2 minutes before
Special Weather Statement
National Weather Service Morristown TN
1123 AM EDT Mon Jun 15 2020

TNZ073-074-151615-
Sevier Smoky Mountains TN-North Sevier TN-
1123 AM EDT Mon Jun 15 2020

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN SEVIER COUNTY UNTIL
1215 PM EDT...

At 1122 AM EDT, Doppler radar was tracking a strong thunderstorm near
Gatlinburg, moving northeast at 10 mph.

Half inch hail and winds in excess of 35 mph will be possible with
this storm.

Locations impacted include...
Sevierville, Gatlinburg, Pigeon Forge, Smoky Mountains-Newfound Gap,
Smoky Mountains-Clingmans Dome, Smoky Mountains-Balsam Mountain,
Pittman Center, Harrisburg, Elkmont and Great Smoky Mountains
National Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

Persons in campgrounds should consider seeking sturdy shelter until
this storm passes.

&&

LAT...LON 3564 8365 3589 8348 3576 8328 3572 8327
      3571 8325 3569 8326 3565 8331 3566 8333
      3566 8335 3562 8340 3561 8342 3561 8344
      3557 8349 3556 8353
TIME...MOT...LOC 1522Z 218DEG 9KT 3565 8351

DH
Special weather statement, Jun 15, 12:17 PM EDT, 1 hour 8 minutes before
Special Weather Statement
National Weather Service Morristown TN
1217 PM EDT Mon Jun 15 2020

TNZ067-068-086-151700-
Northwest Monroe TN-Roane TN-Loudon TN-
1217 PM EDT Mon Jun 15 2020

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL LOUDON AND CENTRAL ROANE
COUNTIES UNTIL 100 PM EDT...

At 1216 PM EDT, Doppler radar was tracking a strong thunderstorm near
Kingston, moving southwest at 10 mph.

Half inch hail and winds in excess of 35 mph will be possible with
this storm.

Locations impacted include...
Oak Ridge, Lenoir City, Kingston, Sweetwater, Loudon, Fairview,
Midtown, Harriman, Philadelphia and Paint Rock.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3567 8463 3569 8463 3569 8462 3571 8462
      3573 8464 3570 8467 3571 8467 3572 8468
      3595 8451 3588 8430 3559 8440
TIME...MOT...LOC 1616Z 023DEG 10KT 3585 8445

DH
Special weather statement, Jun 15, 12:19 PM EDT, 1 hour 6 minutes before
Special Weather Statement
National Weather Service Morristown TN
1219 PM EDT Mon Jun 15 2020

TNZ072>074-151700-
Blount Smoky Mountains TN-Sevier Smoky Mountains TN-North Sevier TN-
1219 PM EDT Mon Jun 15 2020

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN SEVIER COUNTY UNTIL
100 PM EDT...

At 1218 PM EDT, Doppler radar was tracking a strong thunderstorm 8
miles southwest of Gatlinburg, moving northeast at 5 mph.

Penny size hail and winds in excess of 35 mph will be possible with
this storm.

Locations impacted include...
Gatlinburg, Pigeon Forge, Pittman Center, Townsend, Wears Valley,
Elkmont, Great Smoky Mountains National Park and Roundtop Mountain
State Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

Persons in campgrounds should consider seeking sturdy shelter until
this storm passes.

&&

LAT...LON 3564 8376 3568 8375 3568 8367 3569 8368
      3571 8368 3571 8370 3572 8370 3574 8372
      3586 8367 3573 8338 3556 8355
TIME...MOT...LOC 1618Z 209DEG 5KT 3566 8363

DH
Special weather statement, Jun 15, 12:24 PM EDT, 1 hour 1 minute before
Special Weather Statement
National Weather Service Morristown TN
1224 PM EDT Mon Jun 15 2020

TNZ040-041-071>074-151715-
Cocke Smoky Mountains TN-Blount Smoky Mountains TN-
Sevier Smoky Mountains TN-Northwest Cocke TN-NW Blount TN-
North Sevier TN-
1224 PM EDT Mon Jun 15 2020

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN BLOUNT...
SOUTHWESTERN COCKE AND SOUTHERN SEVIER COUNTIES UNTIL 115 PM EDT...

At 1224 PM EDT, Doppler radar was tracking strong thunderstorms along
a line extending from 9 miles northeast of Smoky Mountains-Newfound
Gap to 11 miles north of Smoky Mountains-Fontana Area. Movement was
northeast at 15 mph.

Half inch hail and winds in excess of 40 mph will be possible with
these storms.

Locations impacted include...
Gatlinburg, Pigeon Forge, Smoky Mountains-Newfound Gap, Smoky
Mountains-Fontana Area, Smoky Mountains-Balsam Mountain, Pittman
Center, Townsend, Walland, Wears Valley and Cades Cove.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with these storms, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

Persons in campgrounds should consider seeking sturdy shelter until
these storms pass.

&&

LAT...LON 3552 8389 3575 8382 3589 8315 3573 8321
      3572 8325 3569 8326 3566 8330 3566 8335
      3558 8348 3557 8359 3558 8361 3557 8363
      3556 8376 3553 8381
TIME...MOT...LOC 1624Z 206DEG 12KT 3571 8331 3567 8373

DH
Special weather statement, Jun 15, 1:01 PM EDT, 24 minutes before
Special Weather Statement
National Weather Service Morristown TN
101 PM EDT Mon Jun 15 2020

TNZ040-070-073-074-151800-
Jefferson TN-Sevier Smoky Mountains TN-Northwest Cocke TN-
North Sevier TN-
101 PM EDT Mon Jun 15 2020

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN JEFFERSON...WEST
CENTRAL COCKE AND NORTHEASTERN SEVIER COUNTIES UNTIL 200 PM EDT...

At 100 PM EDT, Doppler radar was tracking a strong thunderstorm near
Gatlinburg, moving north at 15 mph.

Penny size hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Sevierville, Jefferson City, Newport, Gatlinburg, Dandridge, Pigeon
Forge, Pittman Center, Bird Crossing, Fairgarden and Chestnut Hill.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

Persons in campgrounds should consider seeking sturdy shelter until
this storm passes.

&&

LAT...LON 3568 8337 3575 8360 3609 8351 3599 8317
TIME...MOT...LOC 1700Z 200DEG 13KT 3579 8345

DH

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 15, 11:23 AM EDTSpecial Weather StatementMRXSevier52 min
Jun 15, 12:17 PM EDTSpecial Weather StatementMRXRoane43 min
Jun 15, 12:19 PM EDTSpecial Weather StatementMRXSevier41 min
Jun 15, 12:24 PM EDTSpecial Weather StatementMRXSevier51 min
Jun 15, 1:01 PM EDTSpecial Weather StatementMRXJefferson, Sevier59 min
Jun 15, 1:38 PM EDTSpecial Weather StatementMRXKnox52 min
Jun 15, 2:06 PM EDTSpecial Weather StatementMRXJefferson39 min
Jun 15, 2:37 PM EDTSpecial Weather StatementMRXCocke68 min
Jun 15, 2:41 PM EDTSpecial Weather StatementMRXBlount64 min
Jun 15, 2:48 PM EDTSpecial Weather StatementMRXJefferson42 min
Jun 15, 2:54 PM EDTSpecial Weather StatementMRXMcMinn51 min
Jun 15, 3:08 PM EDTSpecial Weather StatementMRXKnox52 min
Jun 15, 3:11 PM EDTSpecial Weather StatementMRXClaiborne49 min
Jun 15, 3:37 PM EDTSpecial Weather StatementMRXHancock53 min
Jun 15, 4:54 PM EDTSpecial Weather StatementMRXHamblen51 min
Jun 15, 7:33 PM EDTSpecial Weather StatementMRXCocke27 min
Jun 15, 2:13 PM EDTSpecial Weather StatementMRXClay47 min
Jun 15, 3:38 PM EDTSpecial Weather StatementMRXCherokee52 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 2020Every severe thunderstorm warning in 2020

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.