Alert archive / Tennessee / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 95, NWS Morristown, TN

June 29, 2020Blount County, Knox County, Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Jun 29, 2020, 6:04 PM EDT for Blount County, Knox 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: Jun 29, 2020, 6:04 PM EDT (22:04 UTC)
Expired: Jun 29, 2020, 6:30 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, Knox County, TN

The radar

The Knoxville radar (KMRX), 60 km from the middle of the area, began a volume at 22:06 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, 10.1 hours before the alert went out and 242 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: 1465 J/kg
Mixed-layer CIN: -41 J/kg
Mixed-layer LCL: 860 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: -68 m²/s²
0-3 km storm-relative helicity: -33 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 29, 3:34 PM EDT, 2 hours 30 minutes earlier.

Area forecast discussion, Jun 29, 3:34 PM EDT, 2 hours 30 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>

Hazardous weather outlook, Jun 29, 3:38 PM EDT, 2 hours 26 minutes before

Hazardous Weather Outlook
National Weather Service Morristown TN
338 PM EDT Mon Jun 29 2020

NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002-
005-006-008-301945-
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-
338 PM EDT Mon Jun 29 2020 /238 PM CDT Mon Jun 29 2020/

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

.DAY ONE...Today and Tonight

A few storms may become strong with high winds this afternoon and
evening. An isolated flash flooding threat will exist as well,
mainly for areas of poor drainage.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

A few strong to severe storms possible Tuesday and Wednesday. Also
rounds of moderate to heavy rainfall over the upcoming week will
lead to the possibility of localized flash flooding, especially in
areas of poor drainage.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

In the hours before

Special weather statement, Jun 29, 4:44 PM EDT, 1 hour 20 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 29, 4:59 PM EDT, 1 hour 5 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 29, 5:34 PM EDT, 30 minutes before

Special Weather Statement
National Weather Service Morristown TN
534 PM EDT Mon Jun 29 2020

TNZ038-069-070-073-292215-
Jefferson TN-Grainger TN-Knox TN-North Sevier TN-
534 PM EDT Mon Jun 29 2020

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN KNOX...CENTRAL
JEFFERSON...SOUTHWESTERN GRAINGER AND NORTHWESTERN SEVIER COUNTIES
UNTIL 615 PM EDT...

At 534 PM EDT, Doppler radar was tracking a strong thunderstorm 9
miles west of New Market, or 13 miles west of Jefferson City, moving
southeast at 35 mph.

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

Locations impacted include...
Knoxville, Sevierville, Jefferson City, Dandridge, Pigeon Forge,
Plainview, New Market, Strawberry Plains, Blaine and House Mountain
State Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 3604 8393 3617 8381 3617 8372 3618 8373
      3619 8372 3605 8333 3579 8352
TIME...MOT...LOC 2134Z 296DEG 30KT 3606 8371

Diegan

Special weather statement, Jun 29, 5:37 PM EDT, 27 minutes before

Special Weather Statement
National Weather Service Morristown TN
537 PM EDT Mon Jun 29 2020

TNZ085>087-292230-
Northwest Monroe TN-Southeast Monroe TN-McMinn TN-
537 PM EDT Mon Jun 29 2020

...SIGNIFICANT WEATHER ADVISORY FOR EAST CENTRAL MCMINN AND
SOUTHWESTERN MONROE COUNTIES UNTIL 630 PM EDT...

At 537 PM EDT, Doppler radar was tracking a strong thunderstorm near
Etowah, or 8 miles southeast of Athens, moving southeast at 10 mph.

Winds in excess of 40 mph will be possible with this storm.

Locations impacted include...
Etowah, Englewood, Tellico Plains, Coker Creek and Mount Vernon.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 3522 8432 3536 8453 3548 8446 3542 8418
      3521 8431
TIME...MOT...LOC 2137Z 296DEG 10KT 3540 8446

Diegan

Special weather statement, Jun 29, 5:58 PM EDT, 6 minutes before

Special Weather Statement
National Weather Service Morristown TN
558 PM EDT Mon Jun 29 2020

TNZ069-071-073-292245-
Knox TN-NW Blount TN-North Sevier TN-
558 PM EDT Mon Jun 29 2020

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN KNOX AND
NORTHEASTERN BLOUNT COUNTIES UNTIL 645 PM EDT...

At 558 PM EDT, Doppler radar was tracking a strong thunderstorm near
Knoxville, moving southeast at 15 mph.

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

Locations impacted include...
Knoxville, Maryville, Alcoa, Louisville, Rockford, Eagleton Village,
Lake Forest, Bearden, Seymour and Wildwood.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 3593 8409 3604 8393 3583 8368 3566 8393
TIME...MOT...LOC 2158Z 322DEG 11KT 3594 8400

Diegan

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 28, 8:01 PM EDT	Special Weather Statement	MRX	Bradley	44 min
Jun 28, 8:17 PM EDT	Severe Thunderstorm Warning	MRX	Bradley, Hamilton	28 min
Jun 29, 2:58 AM EDT	Special Weather Statement	MRX	Union	47 min
Jun 29, 3:49 AM EDT	Special Weather Statement	MRX	Union	41 min
Jun 29, 4:29 AM EDT	Areal Flood Advisory	MRX	Campbell, Claiborne, Grainger, Scott, Union	4 hr
Jun 29, 4:08 PM EDT	Areal Flood Advisory	MRX	Sullivan	3 hr
Jun 29, 4:44 PM EDT	Special Weather Statement	MRX	Hamilton	46 min
Jun 29, 4:59 PM EDT	Special Weather Statement	MRX	Bradley	46 min
Jun 29, 5:07 PM EDT	Areal Flood Advisory	MRX	Anderson, Campbell, Union	3 hr
Jun 29, 5:34 PM EDT	Special Weather Statement	MRX	Jefferson	41 min
Jun 29, 5:37 PM EDT	Special Weather Statement	MRX	Monroe	53 min
Jun 29, 5:58 PM EDT	Special Weather Statement	MRX	Blount, Knox	47 min
Jun 29, 6:23 PM EDT	Areal Flood Advisory	MRX	Anderson, Blount, Knox, Sevier	3 hr
Jun 29, 6:30 PM EDT	Special Weather Statement	MRX	Sevier	45 min
Jun 29, 6:44 PM EDT	Severe Thunderstorm Warning	MRX	Blount, Knox, Sevier	46 min
Jun 29, 6:51 PM EDT	Special Weather Statement	MRX	Campbell	39 min
Jun 29, 6:17 PM EDT	Special Weather Statement	MRX	Clay	43 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 2020 Every 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.