Alert archive / Tennessee / Special Weather Statements in 2018

Special Weather Statement, NWS Morristown, TN

July 17, 2018Roane County, Tennessee

NWS Morristown, TN issued this special weather statement at Jul 17, 2018, 4:02 PM EDT for Roane County, Tennessee. It was in force for 43 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 17, 2018, 4:02 PM EDT (20:02 UTC)
Expired: Jul 17, 2018, 4:45 PM EDT
In force: 43 min
Issued by: NWS Morristown, TN

County Roane County, TN

The radar

The Knoxville radar (KMRX), 106 km from the middle of the area, began a volume at 20:03 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

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 8.0 hours before the alert went out and 282 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: 832 J/kg
Mixed-layer CIN: -22 J/kg
Mixed-layer LCL: 668 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: 30 m²/s²
0-3 km storm-relative helicity: 46 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Jul 16, 7:35 PM EDT, 20 hours 27 minutes earlier.

Area forecast discussion, Jul 16, 7:35 PM EDT, 20 hours 27 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.
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</body>
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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 16, 8:04 PM EDT	Special Weather Statement	MRX	Hamilton	41 min
Jul 16, 8:46 PM EDT	Special Weather Statement	MRX	Bradley	44 min
Jul 16, 9:11 PM EDT	Special Weather Statement	MRX	Bradley	49 min
Jul 17, 3:03 PM EDT	Special Weather Statement	MRX	Loudon	42 min
Jul 17, 3:11 PM EDT	Special Weather Statement	MRX	Knox	49 min
Jul 17, 3:57 PM EDT	Areal Flood Advisory	MRX	Anderson, Blount, Knox	2 hr
Jul 17, 3:59 PM EDT	Special Weather Statement	MRX	Blount	46 min
Jul 17, 4:03 PM EDT	Areal Flood Advisory	MRX	Bradley, Hamilton, McMinn, Meigs, Polk	117 min
Jul 17, 4:08 PM EDT	Special Weather Statement	MRX	Polk	37 min
Jul 17, 4:10 PM EDT	Special Weather Statement	MRX	Carter, Johnson	50 min
Jul 17, 4:11 PM EDT	Special Weather Statement	MRX	Monroe	49 min
Jul 17, 4:45 PM EDT	Special Weather Statement	MRX	Hamilton	45 min
Jul 17, 5:33 PM EDT	Areal Flood Advisory	MRX	Hamilton, Marion	117 min
Jul 17, 6:03 PM EDT	Special Weather Statement	MRX	Sullivan	42 min
Jul 17, 4:37 PM EDT	Special Weather Statement	MRX	Cherokee	53 min

Nearby

Special Weather Statements in Tennessee, 2018 Every special weather statement 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.