Alert archive / Tennessee / Severe Thunderstorm Warnings in 2020
Severe Thunderstorm Warning 99, NWS Morristown, TN
NWS Morristown, TN issued this severe thunderstorm warning at Jul 5, 2020, 1:28 PM EDT for Claiborne County, 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
- Jul 5, 2020, 1:28 PM EDT (17:28 UTC)
- Expired
- Jul 5, 2020, 2:15 PM EDT
- In force
- 47 min
- Issued by
- NWS Morristown, TN
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
County Claiborne County, TN
The radar
The Knoxville radar (KMRX), 42 km from the middle of the area, began a volume at 17:27 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, 5.5 hours before the alert went out and 266 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.
- Mixed-layer CAPE
- 797 J/kg
- Mixed-layer CIN
- -107 J/kg
- Mixed-layer LCL
- 1278 m above ground
- 0-6 km bulk shear
- 6 kt
- 0-1 km storm-relative helicity
- 31 m²/s²
- 0-3 km storm-relative helicity
- 37 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 Jul 5, 1:13 PM EDT, 15 minutes earlier.
Area forecast discussion, Jul 5, 1:13 PM EDT, 15 minutes before
AREA FORECAST DISCUSSION National Weather Service Morristown TN 113 PM EDT Sun Jul 5 2020 .UPDATE... FOR 18Z AVIATION. && .DISCUSSION... The forecast is still largely on track with only minor edits made. Over the past 2 hours, observed temperatures have been running higher than previously forecasted. Hourly temperatures were raised for the next few hours with interpolation to afternoon temperatures from the previous forecast. Overall high temperatures were kept the same as current and future sky cover trends look to moderate the rate of temperature increase this afternoon. Although values remained largely the same, dew points were also updated with the latest, best performing model guidance. Sky cover was also increased to more than 50% from the central Cumberland Plateau into the Central Valley per latest satellite imagery. Diurnal cumulus development is still anticipated area- wide this afternoon, so the overall sky cover forecast was kept the same. Since specific areas of enhanced cumuliform development have yet to take place across the area, chance PoPs were kept the same into the afternoon to account for areal uncertainty of convective initiation/progression. BW && .AVIATION... 18Z TAF DISCUSSION. The current expectation is for a seasonally eventful TAF period with VCTS this afternoon into the early evening, along with reductions to MVFR and potentially IFR tonight. Currently, convection has initiated near and along higher terrain in east Tennessee and southwest Virginia with VCTS already being reported at TRI. The expectation is for further development by 19Z this afternoon with diurnal diminishing during the evening. With limited synoptic-scale features, winds largely remain light and variable into tonight. Based on occurrences from this morning, a similar meteorological environment, and more widespread convection expected today, patchy fog is anticipated with reduction to at least MVFR included in all 3 TAFs. Reduction to IFR was included at TRI based on stronger model guidance indication for calm winds and proximity with Boone Lake. The 11Z to 13Z timeframe is the most likely window for fog development at the sites, but future trends could indicate earlier development and possibly longer presence of fog. However, confidence is still not too high for extent and duration of impact. By midday tomorrow, diurnal cumulus development is expected ahead of more anticipated convection just after the TAF period. BW && .PRELIMINARY POINT TEMPS/POPS... Chattanooga Airport, TN 71 90 71 86 71 / 20 30 30 80 30 Knoxville McGhee Tyson Airport, TN 71 91 70 88 71 / 20 30 20 60 30 Oak Ridge, TN 71 92 70 88 71 / 20 30 20 60 20 Tri Cities Airport, TN 68 90 67 88 67 / 20 40 10 50 20 && .MRX WATCHES/WARNINGS/ADVISORIES... NC...NONE. TN...NONE. VA...NONE. &&
Hazardous weather outlook, Jul 5, 3:05 AM EDT, 10 hours 23 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>In the hours before
Special weather statement, Jul 5, 12:35 PM EDT, 53 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, Jul 5, 1:02 PM EDT, 26 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, Jul 5, 1:16 PM EDT, 12 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, Jul 5, 1:25 PM EDT, 3 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 |
|---|---|---|---|---|
| Jul 5, 12:35 PM EDT | Special Weather Statement | MRX | Campbell | 25 min |
| Jul 5, 1:16 PM EDT | Special Weather Statement | MRX | Claiborne | 29 min |
| Jul 5, 1:25 PM EDT | Special Weather Statement | MRX | Campbell | 50 min |
| Jul 5, 1:41 PM EDT | Special Weather Statement | MRX | Campbell | 34 min |
| Jul 5, 1:43 PM EDT | Special Weather Statement | MRX | Grainger | 32 min |
| Jul 5, 1:51 PM EDT | Special Weather Statement | MRX | Sevier | 39 min |
| Jul 5, 2:04 PM EDT | Special Weather Statement | MRX | Johnson | 41 min |
| Jul 5, 2:11 PM EDT | Special Weather Statement | MRX | Hamblen | 34 min |
| Jul 5, 2:12 PM EDT | Special Weather Statement | MRX | Unicoi | 33 min |
| Jul 5, 2:14 PM EDT | Special Weather Statement | MRX | Grainger | 31 min |
| Jul 5, 2:17 PM EDT | Special Weather Statement | MRX | Campbell | 43 min |
| Jul 5, 2:20 PM EDT | Special Weather Statement | MRX | Claiborne | 40 min |
| Jul 5, 2:24 PM EDT | Special Weather Statement | MRX | Scott | 51 min |
| Jul 5, 2:34 PM EDT | Areal Flood Advisory | MRX | Johnson | 116 min |
| Jul 5, 2:59 PM EDT | Special Weather Statement | MRX | Scott | 46 min |
| Jul 5, 3:04 PM EDT | Special Weather Statement | MRX | Carter | 26 min |
| Jul 5, 3:09 PM EDT | Special Weather Statement | MRX | Blount | 36 min |
| Jul 5, 3:15 PM EDT | Special Weather Statement | MRX | Blount | 45 min |
| Jul 5, 3:31 PM EDT | Special Weather Statement | MRX | Hawkins | 44 min |
| Jul 5, 3:51 PM EDT | Special Weather Statement | MRX | Bradley | 39 min |
| Jul 5, 3:54 PM EDT | Special Weather Statement | MRX | Loudon | 51 min |
| Jul 5, 4:06 PM EDT | Special Weather Statement | MRX | Sullivan, Washington | 39 min |
| Jul 5, 4:07 PM EDT | Special Weather Statement | MRX | Sullivan | 53 min |
| Jul 5, 4:10 PM EDT | Severe Thunderstorm Warning | MRX | Sullivan, Washington | 50 min |
| Jul 5, 4:12 PM EDT | Special Weather Statement | MRX | Roane | 48 min |
| Jul 5, 4:15 PM EDT | Severe Thunderstorm Warning | MRX | Jefferson, Knox, Sevier | 45 min |
| Jul 5, 4:20 PM EDT | Special Weather Statement | MRX | Loudon, Roane | 40 min |
| Jul 5, 4:37 PM EDT | Severe Thunderstorm Warning | MRX | Greene, Sullivan, Washington | 38 min |
| Jul 5, 4:42 PM EDT | Severe Thunderstorm Warning | MRX | Anderson, Loudon, Roane | 48 min |
| Jul 5, 4:46 PM EDT | Severe Thunderstorm Warning | MRX | Hawkins, Sullivan | 44 min |
| Jul 5, 5:02 PM EDT | Special Weather Statement | MRX | McMinn | 43 min |
| Jul 5, 5:10 PM EDT | Severe Thunderstorm Warning | MRX | McMinn, Meigs | 50 min |
| Jul 5, 5:17 PM EDT | Special Weather Statement | MRX | Bledsoe | 43 min |
| Jul 5, 5:51 PM EDT | Severe Thunderstorm Warning | MRX | Bledsoe, Hamilton, Meigs, Rhea | 24 min |
| Jul 5, 6:10 PM EDT | Special Weather Statement | MRX | Bradley | 50 min |
| Jul 5, 6:44 PM EDT | Special Weather Statement | MRX | Hamilton | 46 min |
| Jul 5, 7:08 PM EDT | Special Weather Statement | MRX | Bradley, Hamilton | 52 min |
| Jul 5, 1:02 PM EDT | Special Weather Statement | MRX | Smyth | 28 min |
| Jul 5, 1:38 PM EDT | Special Weather Statement | MRX | Wise, City of Norton | 52 min |
| Jul 5, 2:30 PM EDT | Special Weather Statement | MRX | Wise | 30 min |
| Jul 5, 5:07 PM EDT | Severe Thunderstorm Warning | MRX | Russell, Scott | 38 min |
| Jul 5, 5:44 PM EDT | Severe Thunderstorm Warning | MRX | Russell, Scott, Wise | 46 min |
| Jul 5, 5:58 PM EDT | Special Weather Statement | MRX | Russell | 47 min |
| Jul 5, 6:13 PM EDT | Severe Thunderstorm Warning | MRX | Russell | 33 min |
| Jul 5, 3:10 PM EDT | Special Weather Statement | MRX | Graham | 35 min |
Nearby
Severe Thunderstorm Warnings in Tennessee, 2020Every 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.