Alert archive / Tennessee / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 103, NWS Morristown, TN

August 13, 2019Blount County, Loudon County, Monroe County, Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Aug 13, 2019, 12:53 PM EDT for Blount County, Loudon County, Monroe County, Tennessee. It was in force for 26 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
Aug 13, 2019, 12:53 PM EDT (16:53 UTC)
Expired
Aug 13, 2019, 1:19 PM EDT
In force
26 min
Issued by
NWS Morristown, TN
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Blount County, TN, Loudon County, TN, Monroe County, TN

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 4.9 hours before the alert went out and 227 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 2019-08-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2485 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 2019-08-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 132 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
2485 J/kg
Mixed-layer CIN
-32 J/kg
Mixed-layer LCL
899 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
132 m²/s²
0-3 km storm-relative helicity
105 m²/s²
Significant tornado parameter
1.2
Supercell composite
6.4

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 Aug 13, 11:44 AM EDT, 1 hour 9 minutes earlier.

Area forecast discussion, Aug 13, 11:44 AM EDT, 1 hour 9 minutes before
Area Forecast Discussion...UPDATED
National Weather Service Morristown TN
1144 AM EDT Tue Aug 13 2019

.DISCUSSION...
Wanted to give everyone an update on the timing of the storms
today. Latest surface analysis shows an outflow boundary moving
into the northern Plateau. This boundary will catch up with the
developing lie of storms over the Plateau into far western
Virginia. This line of storms will be the main strong to severe
storms for southwest Virgina and east Tennessee along and north of
interstate 40 (timing between now and 2-3 pm).

Areas south of interstate 40, we expect another storm complex to
develop over middle Tennessee then move southeast into the area
from 2 pm ET to 6-7 pm ET.

The main threat remains the same being damaging winds, marginal
hail up to quarter size, frequent lightning and heavy rains that
may cause isolated flash flooding.

&&

.PRELIMINARY POINT TEMPS/POPS...
Chattanooga Airport, TN             97  75  91  71 /  50  70  20  10
Knoxville McGhee Tyson Airport, TN  94  72  88  70 /  70  70  30  10
Oak Ridge, TN                       95  72  88  68 /  70  70  20  10
Tri Cities Airport, TN              92  69  86  66 /  70  70  40  10

&&

.MRX WATCHES/WARNINGS/ADVISORIES...
NC...None.
TN...Heat Advisory until 8 PM EDT /7 PM CDT/ this evening for
     Anderson-Bledsoe-Bradley-Hamilton-Jefferson-Knox-Loudon-
     Marion-McMinn-Meigs-North Sevier-Northwest Blount-Northwest
     Cocke-Northwest Monroe-Rhea-Roane-Sequatchie-West Polk.

VA...None.
&&
Hazardous weather outlook, Aug 13, 11:48 AM EDT, 1 hour 5 minutes before
Hazardous Weather Outlook...UPDATED
National Weather Service Morristown TN
1148 AM EDT Tue Aug 13 2019

NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002-
005-006-008-141600-
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-
1148 AM EDT Tue Aug 13 2019 /1048 AM CDT Tue Aug 13 2019/

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

.DAY ONE...This Afternoon and Tonight

...Dangerous Heat Indices this afternoon...
...Severe Thunderstorm Potential this afternoon and evening...

Heat index values are expected to approach 105 degrees across the
southern and central TN valley on Tuesday, including Knoxville
and Chattanooga. If spending time outdoors, take frequent breaks
in the shade, stay hydrated, and spend time in air conditioning,
if possible. Never leave children or pets in parked vehicles which
heat up rapidly; Look before you lock!

Thunderstorms are likely this afternoon through early evening.
Some thunderstorms will become severe with damaging winds being
the primary hazard. Hail up to quarter size and frequent lightning
are also anticipated.

Timing of storms...
For southwest Virginia and east Tennessee along and north of
interstate 40, greatest threat of severe storms between now and
2-3 pm. For east Tennessee, along and south of interstate 40, and
southwest North Carolina, greatest threat for severe storms will
be from 2 pm ET to 6-7 pm ET.

Thunderstorms will produce heavy rain rates which will lead to
the potential for isolated flash flooding, especially in urban and
poor drainage areas.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed this afternoon and evening.
Spotters may also submit reports of severe weather on our website
at www.weather.gov/mrx/.

In the hours before

Special weather statement, Aug 13, 11:55 AM EDT, 58 minutes before
Special Weather Statement
National Weather Service Morristown TN
1155 AM EDT Tue Aug 13 2019

TNZ014>016-038-131645-
Claiborne TN-Hancock TN-Grainger TN-Hawkins TN-
1155 AM EDT Tue Aug 13 2019

...SIGNIFICANT WEATHER ADVISORY FOR WEST CENTRAL HAWKINS...EASTERN
CLAIBORNE...SOUTHWESTERN HANCOCK AND NORTHEASTERN GRAINGER COUNTIES
UNTIL 1245 PM EDT...

At 1155 AM EDT, Doppler radar was tracking a strong thunderstorm near
Tazewell, or 13 miles north of Rutledge, moving east at 25 mph.

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

Locations impacted include...
New Tazewell, Bean Station, Tazewell, Lone Mountain, Howard Quarter,
Thorn Hill, Mooresburg, Evanston and Treadway.

LAT...LON 3649 8314 3629 8325 3628 8327 3627 8327
      3628 8328 3626 8328 3628 8330 3627 8330
      3628 8332 3630 8333 3629 8333 3640 8363
      3657 8355
TIME...MOT...LOC 1555Z 291DEG 21KT 3647 8351

SR
Special weather statement, Aug 13, 12:16 PM EDT, 37 minutes before
Special Weather Statement
National Weather Service Morristown TN
1216 PM EDT Tue Aug 13 2019

TNZ015-016-VAZ001-005-131700-
Hancock TN-Hawkins TN-Scott VA-Lee VA-
1216 PM EDT Tue Aug 13 2019

...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN HAWKINS...NORTHERN
HANCOCK...SOUTHEASTERN LEE AND SOUTHWESTERN SCOTT COUNTIES UNTIL 100
PM EDT...

At 1215 PM EDT, Doppler radar was tracking strong thunderstorms along
a line extending from 7 miles southeast of Pennington Gap to near
Sneedville. Movement was east at 30 mph.

Pea size hail and winds in excess of 40 mph will be possible with
these storms.

Locations impacted include...
Rogersville, Sneedville, Surgoinsville, Weber City, Church Hill,
Mount Carmel, Clinchport, Evanston, Okolona, Kyles Ford, Pattonsville
and Klondike.

LAT...LON 3661 8256 3659 8260 3659 8262 3639 8299
      3651 8337 3674 8295
TIME...MOT...LOC 1615Z 286DEG 25KT 3668 8295 3653 8325

SR
Special weather statement, Aug 13, 12:27 PM EDT, 26 minutes before
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Special weather statement, Aug 13, 12:36 PM EDT, 17 minutes before
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Special weather statement, Aug 13, 12:46 PM EDT, 7 minutes before
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Special weather statement, Aug 13, 12:47 PM EDT, 6 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Aug 13, 11:07 AM EDTSpecial Weather StatementMRXCampbell38 min
Aug 13, 11:39 AM EDTSpecial Weather StatementMRXRoane51 min
Aug 13, 11:43 AM EDTSpecial Weather StatementMRXUnion47 min
Aug 13, 11:55 AM EDTSpecial Weather StatementMRXHancock50 min
Aug 13, 12:05 PM EDTSevere Thunderstorm WarningMRXAnderson, Blount, Knox, Loudon, Roane40 min
Aug 13, 12:16 PM EDTSpecial Weather StatementMRXHancock, Hawkins44 min
Aug 13, 12:36 PM EDTSpecial Weather StatementMRXGrainger, Hamblen, Jefferson, Knox39 min
Aug 13, 12:46 PM EDTSpecial Weather StatementMRXBlount, Loudon44 min
Aug 13, 12:47 PM EDTSpecial Weather StatementMRXHawkins, Sullivan73 min
Aug 13, 1:09 PM EDTSpecial Weather StatementMRXCocke, Jefferson, Sevier51 min
Aug 13, 1:13 PM EDTSpecial Weather StatementMRXBlount47 min
Aug 13, 1:37 PM EDTSpecial Weather StatementMRXCarter, Unicoi, Washington68 min
Aug 13, 1:43 PM EDTSevere Thunderstorm WarningMRXCarter, Johnson, Sullivan40 min
Aug 13, 1:44 PM EDTSpecial Weather StatementMRXCocke31 min
Aug 13, 3:05 PM EDTSpecial Weather StatementMRXLoudon40 min
Aug 13, 3:34 PM EDTSpecial Weather StatementMRXSequatchie41 min
Aug 13, 6:19 PM EDTSpecial Weather StatementMRXScott56 min
Aug 13, 6:30 PM EDTSpecial Weather StatementMRXBledsoe, Sequatchie45 min
Aug 13, 6:40 PM EDTSpecial Weather StatementMRXMcMinn50 min
Aug 13, 7:00 PM EDTSpecial Weather StatementMRXCampbell45 min
Aug 13, 7:17 PM EDTSpecial Weather StatementMRXClaiborne58 min
Aug 13, 7:18 PM EDTSpecial Weather StatementMRXHamilton42 min
Aug 13, 7:23 PM EDTSpecial Weather StatementMRXLoudon, McMinn, Meigs, Monroe, Roane67 min
Aug 13, 7:32 PM EDTSpecial Weather StatementMRXPolk43 min
Aug 13, 12:27 PM EDTSpecial Weather StatementMRXRussell, Washington33 min
Aug 13, 12:32 PM EDTSevere Thunderstorm WarningMRXRussell, Washington58 min
Aug 13, 1:29 PM EDTSpecial Weather StatementMRXWashington, City of Bristol76 min
Aug 13, 2:43 PM EDTSpecial Weather StatementMRXCherokee47 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 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.