Alert archive / Tennessee / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 78, NWS Morristown, TN

June 24, 20184 counties in Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Jun 24, 2018, 4:13 PM EDT for 4 counties in Tennessee. It was in force for 47 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 24, 2018, 4:13 PM EDT (20:13 UTC)
Expired: Jun 24, 2018, 5:00 PM EDT
In force: 47 min
Issued by: NWS Morristown, TN
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Cocke County, TN, Grainger County, TN, Hamblen County, TN, Jefferson County, TN

The radar

The Knoxville radar (KMRX), 8 km from the middle of the area, began a volume at 20:16 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, 8.2 hours before the alert went out and 293 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: 782 J/kg
Mixed-layer CIN: -57 J/kg
Mixed-layer LCL: 948 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 90 m²/s²
0-3 km storm-relative helicity: 112 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.8

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 24, 3:08 PM EDT, 1 hour 5 minutes earlier.

Area forecast discussion, Jun 24, 3:08 PM EDT, 1 hour 5 minutes before

Area Forecast Discussion
National Weather Service Morristown TN
308 PM EDT Sun Jun 24 2018

.SHORT TERM...(Tonight and Monday)...After ongoing convection
diminishes later early this evening expect a bit of a lull in the
action, but a mid level short wave is forecast to be moving into
the area late tonight into Monday. This is expected to bring
another round of numerous showers and thunderstorms for the latter
part of the night into Monday. Some of these storms may be strong
to severe with damaging winds the primary threat, so will keep
mention of this in the HWO. With the expected increase in precip
and cloud cover Monday especially north/central, will keep high
temperatures lower than today.

.LONG TERM...(Monday night through Sunday)...Afternoon convection
will linger into at least the first half of the Monday night
period. Should ease from west to east as the evening progresses.
Tuesday the upper ridge remains weak over the forecast area but
should suppress convection over the majority of the Tennessee
Valley while higher terrain and Plateau areas could see scattered
afternoon storms.

The focus shifts to the upper low/trough over the Mississippi River
Valley on Tuesday night. The atmosphere will remain rather moist and
unsettled over our area during this time period. However, by
Wednesday afternoon, the models have been consistent in having the
southern portion of that trough rather active. More widespread
showers and thunderstorms will likely occur on Wednesday into
the first part of Thursday. Expect diminishing rain chances later
Thursday afternoon.

By Friday the upper ridge should suppress the majority of
convection with the exception of along the frontal boundary which
may get hung up across the far southern third of the forecast area.
Under the influence of the upper high, daytime temperatures will be
summer-like in the upper 80s to lower 90s. Overnight temperatures
will generally be in the 70s.

&&

.PRELIMINARY POINT TEMPS/POPS...
Chattanooga Airport, TN             73  90  72  91 /  30  50  30  20
Knoxville McGhee Tyson Airport, TN  71  86  70  89 /  60  70  40  20
Oak Ridge, TN                       72  86  70  90 /  70  70  40  30
Tri Cities Airport, TN              69  82  66  85 /  60  70  50  30

&&

.MRX WATCHES/WARNINGS/ADVISORIES...
NC...None.
TN...None.
VA...None.
&&

LW/AC

Hazardous weather outlook, Jun 24, 2:59 PM EDT, 1 hour 14 minutes before

Hazardous Weather Outlook
National Weather Service Morristown TN
259 PM EDT Sun Jun 24 2018

NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002-
005-006-008-251900-
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-
259 PM EDT Sun Jun 24 2018 /159 PM CDT Sun Jun 24 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 will be possible late this afternoon into
tonight. Damaging winds will be the main threat with these
storms. Hail up to quarter size and localized flash flooding will
also be possible.

.DAYS TWO THROUGH SEVEN...Monday through Saturday

A few strong to severe storms will also be possible Monday.
Damaging winds will be the main threat with these storms. Hail up
to quarter size will also be possible. Heavy rainfall will also
lead to localized flash flooding especially in areas of poor
drainage.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed at some point today through
Monday.

In the hours before

Special weather statement, Jun 24, 2:12 PM EDT, 2 hours 1 minute before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

Special weather statement, Jun 24, 3:11 PM EDT, 1 hour 2 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

Special weather statement, Jun 24, 3:47 PM EDT, 26 minutes before

Special Weather Statement
National Weather Service Morristown TN
347 PM EDT SUN JUN 24 2018

TNZ039-040-042-070-242030-
Jefferson TN-Hamblen TN-Northwest Greene TN-Northwest Cocke TN-
347 PM EDT SUN JUN 24 2018

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN JEFFERSON...NORTHERN
COCKE...SOUTHWESTERN GREENE AND SOUTHERN HAMBLEN COUNTIES UNTIL 430
PM EDT...

At 347 PM EDT, Doppler radar was tracking a strong thunderstorm near
Jefferson City, moving east at 20 mph.

Half inch hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Morristown, Jefferson City, Dandridge, White Pine, Baneberry,
Parrottsville, Mosheim, Caney Branch, Bybee, Alpha, Lowland and
Mohawk.

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 3605 8349 3617 8347 3619 8347 3622 8296
      3598 8299 3595 8300
TIME...MOT...LOC 1947Z 274DEG 19KT 3612 8339

DH

Special weather statement, Jun 24, 3:55 PM EDT, 18 minutes before

Special Weather Statement
National Weather Service Morristown TN
355 PM EDT SUN JUN 24 2018

TNZ040-041-043-045-242045-
Cocke Smoky Mountains TN-Northwest Cocke TN-Southeast Greene TN-
Unicoi TN-
355 PM EDT SUN JUN 24 2018

...SIGNIFICANT WEATHER ADVISORY FOR EAST CENTRAL COCKE...SOUTHEASTERN
GREENE AND SOUTHWESTERN UNICOI COUNTIES UNTIL 445 PM EDT...

At 355 PM EDT, Doppler radar was tracking a strong thunderstorm 7
miles southeast of Parrottsville, or 12 miles east of Newport, moving
east at 20 mph.

Half inch hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Caney Branch, Del Rio, Rocky Fork and Cedar Creek.

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 3595 8256 3597 8261 3601 8261 3603 8259
      3605 8260 3605 8267 3600 8278 3597 8277
      3592 8282 3595 8285 3595 8288 3593 8291
      3593 8292 3588 8290 3587 8292 3584 8292
      3586 8307 3605 8305 3606 8255
TIME...MOT...LOC 1955Z 274DEG 19KT 3596 8298

DH

Special weather statement, Jun 24, 4:08 PM EDT, 5 minutes before

Special Weather Statement
National Weather Service Morristown TN
408 PM EDT SUN JUN 24 2018

TNZ039-040-070-242115-
Jefferson TN-Hamblen TN-Northwest Cocke TN-
408 PM EDT SUN JUN 24 2018

...SIGNIFICANT WEATHER ADVISORY FOR JEFFERSON...NORTHWESTERN COCKE
AND SOUTHWESTERN HAMBLEN COUNTIES UNTIL 515 PM EDT...

At 408 PM EDT, Doppler radar was tracking a strong thunderstorm over
New Market, or over Jefferson City, moving east at 15 mph.

Half inch hail and wind gusts up to 50 mph will be possible with this
storm.

Locations impacted include...
Morristown, Jefferson City, Newport, Dandridge, White Pine, New
Market, Baneberry, Bybee, Alpha, Piedmont and Lowland.

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 3603 8364 3616 8360 3615 8359 3617 8358
      3617 8356 3618 8356 3618 8354 3616 8353
      3618 8352 3617 8348 3619 8347 3619 8345
      3617 8317 3616 8317 3612 8312 3611 8311
      3591 8316
TIME...MOT...LOC 2008Z 280DEG 14KT 3611 8353

DH

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 24, 4:22 AM EDT	Special Weather Statement	MRX	Grainger, Hamblen	38 min
Jun 24, 1:44 PM EDT	Severe Thunderstorm Warning	MRX	Bradley, McMinn, Meigs, Rhea	31 min
Jun 24, 2:12 PM EDT	Special Weather Statement	MRX	McMinn, Monroe, Polk	63 min
Jun 24, 3:47 PM EDT	Special Weather Statement	MRX	Jefferson	43 min
Jun 24, 4:08 PM EDT	Special Weather Statement	MRX	Jefferson	67 min
Jun 24, 4:16 PM EDT	Special Weather Statement	MRX	McMinn	44 min
Jun 24, 4:18 PM EDT	Special Weather Statement	MRX	Hamilton	42 min
Jun 24, 4:20 PM EDT	Special Weather Statement	MRX	Knox	55 min
Jun 24, 4:32 PM EDT	Severe Thunderstorm Warning	MRX	McMinn, Meigs	43 min
Jun 24, 4:36 PM EDT	Areal Flood Warning	MRX	Jefferson	3 hr
Jun 24, 4:38 PM EDT	Special Weather Statement	MRX	Marion	52 min
Jun 24, 4:40 PM EDT	Severe Thunderstorm Warning	MRX	Cocke, Greene	65 min
Jun 24, 4:47 PM EDT	Flash Flood Warning	MRX	Hamilton, Meigs, Rhea, Sequatchie	3 hr
Jun 24, 4:47 PM EDT	Special Weather Statement	MRX	Blount	58 min
Jun 24, 4:49 PM EDT	Special Weather Statement	MRX	Hamilton	41 min
Jun 24, 4:59 PM EDT	Severe Thunderstorm Warning	MRX	Hamilton, Marion, Sequatchie	42 min
Jun 24, 5:04 PM EDT	Severe Thunderstorm Warning	MRX	Bradley, Hamilton, McMinn, Meigs, Polk	56 min
Jun 24, 5:07 PM EDT	Special Weather Statement	MRX	Loudon, Roane	53 min
Jun 24, 5:14 PM EDT	Special Weather Statement	MRX	Monroe	46 min
Jun 24, 5:19 PM EDT	Severe Thunderstorm Warning	MRX	Blount, Loudon, McMinn, Meigs, Monroe, Roane	56 min
Jun 24, 5:29 PM EDT	Special Weather Statement	MRX	Bradley	46 min
Jun 24, 5:32 PM EDT	Severe Thunderstorm Warning	MRX	Monroe, Polk	47 min
Jun 24, 5:44 PM EDT	Severe Thunderstorm Warning	MRX	Bradley, Hamilton, Polk	25 min
Jun 24, 5:48 PM EDT	Special Weather Statement	MRX	Grainger, Union	57 min
Jun 24, 5:56 PM EDT	Special Weather Statement	MRX	Hamblen	64 min
Jun 24, 6:00 PM EDT	Severe Thunderstorm Warning	MRX	Claiborne, Grainger, Greene, Hamblen, Hancock, Hawkins	60 min
Jun 24, 6:16 PM EDT	Severe Thunderstorm Warning	MRX	McMinn, Meigs, Monroe, Rhea	59 min
Jun 24, 6:33 PM EDT	Special Weather Statement	MRX	Cocke, Grainger, Jefferson	42 min
Jun 24, 6:53 PM EDT	Special Weather Statement	MRX	Greene	67 min
Jun 24, 7:49 PM EDT	Special Weather Statement	MRX	Sullivan	56 min
Jun 24, 3:11 PM EDT	Special Weather Statement	MRX	Cherokee, Clay	49 min
Jun 24, 3:55 PM EDT	Special Weather Statement	MRX	Madison	50 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 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.