Alert archive / Tennessee / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 110, NWS Morristown, TN

June 26, 20185 counties in Tennessee; Cherokee County, Clay County, North Carolina

NWS Morristown, TN issued this severe thunderstorm warning at Jun 26, 2018, 7:17 PM EDT for 5 counties in Tennessee; Cherokee County, Clay County, North Carolina. It was in force for 58 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 26, 2018, 7:17 PM EDT (23:17 UTC)
Expired: Jun 26, 2018, 8:15 PM EDT
In force: 58 min
Issued by: NWS Morristown, TN
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Cherokee County, NC, Clay County, NC, Bradley County, TN, Hamilton County, TN, Marion County, TN, Polk County, TN, Sequatchie County, TN

The radar

The Northeast Alabama radar (KHTX), 122 km from the middle of the area, began a volume at 23:20 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, 11.3 hours before the alert went out and 197 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 2005 J/kg
Mixed-layer CIN: -19 J/kg
Mixed-layer LCL: 737 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 38 m²/s²
0-3 km storm-relative helicity: 49 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 26, 3:35 PM EDT, 3 hours 42 minutes earlier.

Area forecast discussion, Jun 26, 3:35 PM EDT, 3 hours 42 minutes before

Area Forecast Discussion
National Weather Service Morristown TN
335 PM EDT Tue Jun 26 2018

.SHORT TERM...(Tonight and Wednesday)...Convective complex moving
into our northwest areas will spread south and east this
afternoon/early evening. Damaging wind gusts still look like the
primary threat over much of the area, but across northern areas,
especially areas that are already quite wet in southwest Virginia,
there will be an enhanced risk for flooding. Will leave FFA as is
for now. Expect convection to decrease behind this complex this
evening, then another mid/upper level short wave trough will be
approaching later tonight into Wednesday. Expect numerous showers
and thunderstorms again on Wednesday. Once again some of these
storms may be strong to severe, with damaging winds the primary
threat along with the possibility of flooding especially in areas
that are already wet. Will keep mention in the HWO for this.

.LONG TERM...(Wednesday night through Tuesday)...At the beginning
of this period, the upper trough and associated short waves will
be pushing through the area, with the first short wave possibly
about through the area Wednesday evening, but another short wave
looking to pass through during Wednesday night. On Thursday a weak
upper ridge builds in that will keep the chances of showers and
storms lower through the weekend. This setup is very sluggish to
move and we will probably have a consistent gradient of precip
chances through the weekend with only a few chances in our NE
areas into SW VA, but with scattered showers and storms each day
in the CHA area during that period. Early next week, the deeper
moisture axis will be pushed over us again, (although it will not
be all that rich), so better precip chances should return to SW VA
again then.

With the weak ridge building in this week, there should be a
corresponding weak heating later in the week with max temps in the
valley in the lower 90s by Friday for most of the valley
locations.

&&

.PRELIMINARY POINT TEMPS/POPS...
Chattanooga Airport, TN             72  87  72  91 /  50  60  60  40
Knoxville McGhee Tyson Airport, TN  71  85  70  89 /  40  60  70  50
Oak Ridge, TN                       71  85  71  90 /  40  60  60  40
Tri Cities Airport, TN              67  84  68  85 /  40  60  70  30

&&

.MRX WATCHES/WARNINGS/ADVISORIES...
NC...None.
TN...None.
VA...Flash Flood Watch until 8 PM EDT this evening for Lee-Russell-
     Scott-Washington-Wise.

&&

LW/GM

Hazardous weather outlook, Jun 26, 3:31 PM EDT, 3 hours 46 minutes before

Hazardous Weather Outlook
National Weather Service Morristown TN
331 PM EDT Tue Jun 26 2018

NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002-
005-006-008-271945-
Cherokee-Clay-Scott TN-Campbell-Claiborne-Hancock-Hawkins-
Sullivan-Johnson-Morgan-Anderson-Union-Grainger-Hamblen-
Northwest Cocke-Cocke Smoky Mountains-Northwest Greene-
Southeast Greene-Washington TN-Unicoi-Northwest Carter-
Southeast Carter-Roane-Loudon-Knox-Jefferson-NW 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-Scott-Russell-Washington-
331 PM EDT Tue Jun 26 2018 /231 PM CDT Tue Jun 26 2018/

This Hazardous Weather Outlook is for portions of Southwest North
Carolina...East Tennessee and Southwest Virginia.

.DAY ONE...This Afternoon and Tonight

Strong to severe storms are expected this afternoon with damaging
winds being the primary threat. Hail up to quarter size and
localized flash flooding will also be possible.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

Scattered thunderstorms are expected to develop over the Southern
Appalachian Region Wednesday afternoon. A few of these storms may
become strong or severe, producing damaging winds, hail and heavy
rainfall with localized flash flooding possible.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be need this afternoon and again on
Wednesday afternoon.

In the hours before

Special weather statement, Jun 26, 6:07 PM EDT, 1 hour 10 minutes before

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Local storm report, Jun 26, 6:11 PM EDT, 1 hour 6 minutes before

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Local storm report, Jun 26, 6:21 PM EDT, 56 minutes before

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Local storm report, Jun 26, 6:43 PM EDT, 34 minutes before

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Special weather statement, Jun 26, 6:49 PM EDT, 28 minutes before

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Local storm report, Jun 26, 6:51 PM EDT, 26 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 26, 4:41 AM EDT	Special Weather Statement	MRX	Hamblen	49 min
Jun 26, 5:23 AM EDT	Special Weather Statement	MRX	Cocke	52 min
Jun 26, 6:07 AM EDT	Special Weather Statement	MRX	Hamblen	53 min
Jun 26, 2:45 PM EDT	Special Weather Statement	MRX	Hancock	45 min
Jun 26, 3:31 PM EDT	Special Weather Statement	MRX	Grainger	44 min
Jun 26, 3:39 PM EDT	Special Weather Statement	MRX	Scott	66 min
Jun 26, 4:02 PM EDT	Severe Thunderstorm Warning	MRX	Grainger, Hamblen, Hawkins	43 min
Jun 26, 4:08 PM EDT	Severe Thunderstorm Warning	MRX	Anderson, Campbell, Scott, Union	67 min
Jun 26, 4:21 PM EDT	Severe Thunderstorm Warning	MRX	Morgan	39 min
Jun 26, 4:26 PM EDT	Special Weather Statement	MRX	Claiborne, Hancock	49 min
Jun 26, 4:30 PM EDT	Severe Thunderstorm Warning	MRX	Cocke, Greene	60 min
Jun 26, 4:49 PM EDT	Severe Thunderstorm Warning	MRX	Claiborne, Grainger, Hamblen, Hancock, Hawkins, Jefferson and 3 more	41 min
Jun 26, 4:57 PM EDT	Severe Thunderstorm Warning	MRX	Anderson, Blount, Knox, Loudon, Morgan, Roane	48 min
Jun 26, 5:15 PM EDT	Areal Flood Advisory	MRX	Cocke, Grainger, Greene, Hamblen, Hawkins	2 hr
Jun 26, 5:27 PM EDT	Severe Thunderstorm Warning	MRX	Blount, Cocke, Greene, Hamblen, Jefferson, Knox and 1 more	78 min
Jun 26, 5:34 PM EDT	Severe Thunderstorm Warning	MRX	Bledsoe, Blount, Knox, Loudon, McMinn, Meigs and 3 more	56 min
Jun 26, 5:41 PM EDT	Special Weather Statement	MRX	Greene, Hawkins	64 min
Jun 26, 5:50 PM EDT	Areal Flood Advisory	MRX	Anderson, Blount, Knox, Loudon, Meigs, Morgan and 2 more	115 min
Jun 26, 6:07 PM EDT	Special Weather Statement	MRX	Unicoi	38 min
Jun 26, 6:25 PM EDT	Severe Thunderstorm Warning	MRX	Bledsoe, Blount, Bradley, Hamilton, McMinn, Meigs and 4 more	65 min
Jun 26, 6:43 PM EDT	Areal Flood Advisory	MRX	Bledsoe, McMinn, Meigs, Monroe, Rhea	2 hr
Jun 26, 6:49 PM EDT	Special Weather Statement	MRX	Unicoi	56 min
Jun 26, 6:52 PM EDT	Areal Flood Advisory	MRX	Greene	53 min
Jun 26, 10:58 AM EDT	Severe Thunderstorm Warning	MRX	Wise, City of Norton	47 min
Jun 26, 11:37 AM EDT	Severe Thunderstorm Warning	MRX	Russell, Scott, Washington, Wise, City of Bristol	38 min
Jun 26, 12:14 PM EDT	Special Weather Statement	MRX	Washington, City of Bristol	46 min
Jun 26, 12:52 PM EDT	Areal Flood Advisory	MRX	Russell, Washington, City of Bristol	113 min
Jun 26, 1:09 PM EDT	Flash Flood Watch	MRX	Lee, Russell, Scott, Washington, Wise, City of Bristol and 1 more	7 hr

Nearby

Severe Thunderstorm Warnings in Tennessee, 2018 Severe Thunderstorm Warnings in North Carolina, 2018 Every severe thunderstorm warning in 2018

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.