Alert archive / Tennessee / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 104, NWS Morristown, TN

August 13, 2019Carter County, Johnson County, Sullivan County, Tennessee; Washington County, City of Bristol, Virginia

NWS Morristown, TN issued this severe thunderstorm warning at Aug 13, 2019, 1:43 PM EDT for Carter County, Johnson County, Sullivan County, Tennessee; Washington County, City of Bristol, Virginia. It was in force for 40 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, 1:43 PM EDT (17:43 UTC)
Expired: Aug 13, 2019, 2:23 PM EDT
In force: 40 min
Issued by: NWS Morristown, TN
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Carter County, TN, Johnson County, TN, Sullivan County, TN, City of Bristol, VA, Washington County, VA

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Aug 13, 1:23 PM EDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 5.7 hours before the alert went out and 202 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: 560 J/kg
Mixed-layer CIN: -74 J/kg
Mixed-layer LCL: 941 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 93 m²/s²
0-3 km storm-relative helicity: 107 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 0.8

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 Aug 13, 1:42 PM EDT, 1 minute earlier.

Area forecast discussion, Aug 13, 1:42 PM EDT, 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>

Hazardous weather outlook, Aug 13, 11:48 AM EDT, 1 hour 55 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, 1:09 PM EDT, 34 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>

Local storm report, Aug 13, 1:13 PM EDT, 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>

Special weather statement, Aug 13, 1:13 PM EDT, 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>

Special weather statement, Aug 13, 1:29 PM EDT, 14 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, Aug 13, 1:29 PM EDT, 14 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, Aug 13, 1:37 PM EDT, 6 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>

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 13, 11:07 AM EDT	Special Weather Statement	MRX	Campbell	38 min
Aug 13, 11:39 AM EDT	Special Weather Statement	MRX	Roane	51 min
Aug 13, 11:43 AM EDT	Special Weather Statement	MRX	Union	47 min
Aug 13, 11:55 AM EDT	Special Weather Statement	MRX	Hancock	50 min
Aug 13, 12:05 PM EDT	Severe Thunderstorm Warning	MRX	Anderson, Blount, Knox, Loudon, Roane	40 min
Aug 13, 12:16 PM EDT	Special Weather Statement	MRX	Hancock, Hawkins	44 min
Aug 13, 12:36 PM EDT	Special Weather Statement	MRX	Grainger, Hamblen, Jefferson, Knox	39 min
Aug 13, 12:46 PM EDT	Special Weather Statement	MRX	Blount, Loudon	44 min
Aug 13, 12:47 PM EDT	Special Weather Statement	MRX	Hawkins, Sullivan	73 min
Aug 13, 12:53 PM EDT	Severe Thunderstorm Warning	MRX	Blount, Loudon, Monroe	26 min
Aug 13, 1:09 PM EDT	Special Weather Statement	MRX	Cocke, Jefferson, Sevier	51 min
Aug 13, 1:13 PM EDT	Special Weather Statement	MRX	Blount	47 min
Aug 13, 1:37 PM EDT	Special Weather Statement	MRX	Carter, Unicoi, Washington	68 min
Aug 13, 1:44 PM EDT	Special Weather Statement	MRX	Cocke	31 min
Aug 13, 3:05 PM EDT	Special Weather Statement	MRX	Loudon	40 min
Aug 13, 3:34 PM EDT	Special Weather Statement	MRX	Sequatchie	41 min
Aug 13, 6:19 PM EDT	Special Weather Statement	MRX	Scott	56 min
Aug 13, 6:30 PM EDT	Special Weather Statement	MRX	Bledsoe, Sequatchie	45 min
Aug 13, 6:40 PM EDT	Special Weather Statement	MRX	McMinn	50 min
Aug 13, 7:00 PM EDT	Special Weather Statement	MRX	Campbell	45 min
Aug 13, 7:17 PM EDT	Special Weather Statement	MRX	Claiborne	58 min
Aug 13, 7:18 PM EDT	Special Weather Statement	MRX	Hamilton	42 min
Aug 13, 7:23 PM EDT	Special Weather Statement	MRX	Loudon, McMinn, Meigs, Monroe, Roane	67 min
Aug 13, 7:32 PM EDT	Special Weather Statement	MRX	Polk	43 min
Aug 13, 12:27 PM EDT	Special Weather Statement	MRX	Russell, Washington	33 min
Aug 13, 12:32 PM EDT	Severe Thunderstorm Warning	MRX	Russell, Washington	58 min
Aug 13, 1:29 PM EDT	Special Weather Statement	MRX	Washington, City of Bristol	76 min
Aug 13, 2:43 PM EDT	Special Weather Statement	MRX	Cherokee	47 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 2019 Severe Thunderstorm Warnings in Virginia, 2019 Every 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.