Alert archive / Tennessee / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 116, NWS Morristown, TN

October 31, 2019Claiborne County, Hancock County, Union County, Tennessee; Lee County, Virginia

NWS Morristown, TN issued this severe thunderstorm warning at Oct 31, 2019, 11:33 AM EDT for Claiborne County, Hancock County, Union County, Tennessee; Lee County, Virginia. 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 counties it named.

The facts

Issued
Oct 31, 2019, 11:33 AM EDT (15:33 UTC)
Expired
Oct 31, 2019, 12:15 PM EDT
In force
42 min
Issued by
NWS Morristown, TN
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Claiborne County, TN, Hancock County, TN, Union County, TN, Lee County, VA

The radar

The Knoxville radar (KMRX), 37 km from the middle of the area, began a volume at 15:33 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, 3.6 hours before the alert went out and 284 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 2019-10-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCLEL10008507005003002001001 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 2019-10-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -110 square meters per square second.1939587897117Sfc1 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
580 m above ground
0-6 km bulk shear
64 kt
0-1 km storm-relative helicity
-110 m²/s²
0-3 km storm-relative helicity
260 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 Oct 31, 11:22 AM EDT, 11 minutes earlier.

Area forecast discussion, Oct 31, 11:22 AM EDT, 11 minutes before
Area Forecast Discussion
National Weather Service Morristown TN
1122 AM EDT Thu Oct 31 2019

.DISCUSSION...
Cold front is moving rapidly east across the western part of the
forecast area late this morning. A line of showers has
intensified out ahead of the front across the central valley with
high winds with these showers just ahead of the front. Some
clearing has occurred out ahead of the front allowing increased
instability and temperatures to reach into the mid 70s. The
northeast part of the area may see damaging winds as strong winds
aloft are brought down to the surface. In the higher elevations
south to southwest winds are still strong at aroung 40 to 60 mph.
Will keep the advisory going and will extend it if front is not
past the mountains by 18Z. Heaviest rain has occurred across the
southern part of the area so will continue flood watch through 00Z
tonight. Updated grids for temperatures and rain chances. Updated
forecast sent.

&&

.PRELIMINARY POINT TEMPS/POPS...
Chattanooga Airport, TN             69  32  54  34 /  90   0   0   0
Knoxville McGhee Tyson Airport, TN  74  31  52  33 /  90  10   0   0
Oak Ridge, TN                       71  30  52  33 /  90  10   0   0
Tri Cities Airport, TN              72  30  51  31 /  80  20   0   0

&&

.MRX WATCHES/WARNINGS/ADVISORIES...
NC...Flood Watch until 8 PM EDT this evening for Cherokee-Clay.

     Freeze Warning from 2 AM to 10 AM EDT Friday for Cherokee-Clay.

TN...Flood Watch until 8 PM EDT this evening for Blount Smoky
     Mountains-Cocke Smoky Mountains-East Polk-Sevier Smoky
     Mountains-Southeast Monroe.

     Freeze Warning from 2 AM EDT /1 AM CDT/ to 10 AM EDT /9 AM CDT/
     Friday for Anderson-Bledsoe-Blount Smoky Mountains-Bradley-
     Campbell-Claiborne-Cocke Smoky Mountains-East Polk-Grainger-
     Hamblen-Hamilton-Hancock-Hawkins-Jefferson-Johnson-Knox-
     Loudon-Marion-McMinn-Meigs-Morgan-North Sevier-Northwest
     Blount-Northwest Carter-Northwest Cocke-Northwest Greene-
     Northwest Monroe-Rhea-Roane-Scott-Sequatchie-Sevier Smoky
     Mountains-Southeast Carter-Southeast Greene-Southeast
     Monroe-Sullivan-Unicoi-Union-Washington-West Polk.

     Wind Advisory until 2 PM EDT this afternoon for Blount Smoky
     Mountains-Cocke Smoky Mountains-Johnson-Sevier Smoky
     Mountains-Southeast Carter-Southeast Greene-Southeast
     Monroe-Unicoi.

VA...Freeze Warning from 2 AM to 10 AM EDT Friday for Lee-Russell-
     Scott-Washington-Wise.

&&

TD
Hazardous weather outlook, Oct 31, 3:28 AM EDT, 8 hours 5 minutes before
Hazardous Weather Outlook
National Weather Service Morristown TN
328 AM EDT Thu Oct 31 2019

NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002-
005-006-008-010730-
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-
328 AM EDT Thu Oct 31 2019 /228 AM CDT Thu Oct 31 2019/

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

.DAY ONE...Today and Tonight

Severe storms will be possible early Thursday morning into early
Thursday afternoon ahead of a cold front with strong winds being
the primary hazard. A brief weak isolated tornado or two will also
be possible. Best chances for severe storms will be to the north
and east of Knoxville during the morning and early afternoon
hours.

Periods of locally heavy rainfall are possible Thursday morning
and afternoon which may cause localized flooding, especially
across the Smoky Mountains, southeast Tennessee, and southwest
North Carolina.

Strong winds will continue across the higher elevations into the
early afternoon with gusts as high as 45 mph possible.

Freeze temperatures along with patchy to widespread frost are
expected late tonight.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday

Freeze temperatures along with patchy to widespread frost will
continue into Friday morning.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed today.

In the hours before

Special weather statement, Oct 31, 8:41 AM EDT, 2 hours 52 minutes before
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Special weather statement, Oct 31, 9:42 AM EDT, 1 hour 51 minutes before
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      <h1 id="headline">This service is currently unavailable.</h1>
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        The site you requested is temporarily down for maintenance or an unexpected outage.
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Special weather statement, Oct 31, 10:32 AM EDT, 1 hour 1 minute before
Special Weather Statement
National Weather Service Morristown TN
1032 AM EDT Thu Oct 31 2019

TNZ036-067-069-311515-
Anderson TN-Roane TN-Knox TN-
1032 AM EDT Thu Oct 31 2019

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN KNOX...ANDERSON AND
EASTERN ROANE COUNTIES UNTIL 1115 AM EDT...

At 1031 AM EDT, Doppler radar was tracking a strong shower over
Kingston, moving northeast at 55 mph.

Wind gusts up to 50 mph will be possible with this storm.

Locations impacted include...
Oak Ridge, Clinton, Kingston, Fairview, Oliver Springs, Midtown,
Harriman, Rocky Top, Norris and Bradbury.

LAT...LON 3585 8463 3599 8447 3599 8444 3605 8434
      3608 8437 3624 8417 3624 8414 3606 8394
      3589 8426 3590 8428 3587 8429 3589 8433
      3584 8434 3573 8455
TIME...MOT...LOC 1431Z 229DEG 47KT 3583 8453

DGS
Local storm report, Oct 31, 11:05 AM EDT, 28 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MORRISTOWN TN
1105 AM EDT THU OCT 31 2019

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1100 AM     TSTM WND DMG     1 N BRADBURY            35.88N 84.39W
10/31/2019                   ROANE              TN   PUBLIC

            BARN ROOF RIPPED OFF. POLE BARN FLATTENED
            AND MULTIPLE TREES DOWN.

&&
Local storm report, Oct 31, 11:15 AM EDT, 18 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MORRISTOWN TN
1115 AM EDT THU OCT 31 2019

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1045 AM     TSTM WND DMG     3 ESE KINGSTON          35.86N 84.46W
10/31/2019                   ROANE              TN   PUBLIC

            NUMEROUS TREES AND POWER LINES DOWN ALONG
            LADDRIDGE RD.

&&

The office that day

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

IssuedProductOfficeCountiesLasted
Oct 31, 3:16 AM EDTFreeze WarningMRXAnderson, Bledsoe, Blount, Bradley, Campbell, Carter and 27 more31 hr
Oct 31, 8:41 AM EDTSpecial Weather StatementMRXBledsoe, Marion, Sequatchie49 min
Oct 31, 9:42 AM EDTSpecial Weather StatementMRXRhea, Roane48 min
Oct 31, 10:32 AM EDTSpecial Weather StatementMRXAnderson, Roane43 min
Oct 31, 10:58 AM EDTSevere Thunderstorm WarningMRXAnderson, Campbell, Knox, Union47 min
Oct 31, 11:24 AM EDTSevere Thunderstorm WarningMRXGrainger, Jefferson, Knox36 min
Oct 31, 11:40 AM EDTSevere Thunderstorm WarningMRXClaiborne, Grainger, Hamblen, Hancock, Hawkins50 min
Oct 31, 11:44 AM EDTSevere Thunderstorm WarningMRXCocke, Grainger, Greene, Hamblen, Jefferson, Sevier33 min
Oct 31, 11:50 AM EDTTornado WarningMRXClaiborne, Hancock40 min
Oct 31, 12:11 PM EDTSevere Thunderstorm WarningMRXHamblen, Hancock, Hawkins, Sullivan34 min
Oct 31, 12:27 PM EDTSevere Thunderstorm WarningMRXCocke, Greene, Hawkins48 min
Oct 31, 12:47 PM EDTSevere Thunderstorm WarningMRXHawkins, Sullivan43 min
Oct 31, 12:58 PM EDTSevere Thunderstorm WarningMRXCarter, Sullivan, Washington27 min
Oct 31, 1:24 PM EDTSpecial Weather StatementMRXSullivan66 min
Oct 31, 12:26 PM EDTSevere Thunderstorm WarningMRXLee, Scott, Wise, City of Norton49 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 2019Severe Thunderstorm Warnings in Virginia, 2019Every severe thunderstorm warning in 2019

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.