Alert archive / Tennessee / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 283, NWS Morristown, TN

August 20, 1997Blount County, Sevier County, Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Aug 20, 1997, 12:10 AM EDT for Blount County, Sevier County, Tennessee. It was in force for 65 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 20, 1997, 12:10 AM EDT (04:10 UTC)
Expired: Aug 20, 1997, 1:15 AM EDT
In force: 65 min
Issued by: NWS Morristown, TN
Area: Whole counties

Counties Blount County, TN, Sevier County, TN

The radar

The Knoxville radar (KMRX), 56 km from the middle of the area, began a volume at 04:15 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 00:00Z, 4.2 hours before the alert went out and 273 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: 1249 J/kg
Mixed-layer CIN: -10 J/kg
Mixed-layer LCL: 1276 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: -7 m²/s²
0-3 km storm-relative helicity: 57 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.2

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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 19, 7:53 PM EDT, 4 hours 17 minutes earlier.

Area forecast discussion, Aug 19, 7:53 PM EDT, 4 hours 17 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE KNOXVILLE/TRI-CITIES TN
750 PM EDT TUE AUG 19 1997

SVR TSRA MOVG STEADILY E ACRS MID TN AND SOME TSRA ALREADY ON THE
PLATEAU SO WE MIGHT CHANGE MAINLY AFT MIDNITE WORDING HERE.
UNSTABLE AIRMASS AND DECENT DYNAMICS WL COMBINE FOR AN ACTIVE
NITE ACRS E TN (MOST OF FA AFT MIDNITE).  REMAINDER OF FCST FINE
BUT MINS MAY NEED TO BE RAISED A CAT AS CLOUDS INCREASE AND
PRES GRAD TIGHTENS AHD OF SFC LOW PROXGGED TO SHIFT ENE THRU KY.

In the hours before

Local storm report, Aug 19, 9:44 PM EDT, 2 hours 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>

Local storm report, Aug 19, 11:16 PM EDT, 54 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 19, 8:16 PM EDT	Severe Thunderstorm Warning	MRX	Cumberland	59 min
Aug 19, 9:15 PM EDT	Severe Thunderstorm Warning	MRX	Cumberland	60 min
Aug 19, 9:34 PM EDT	Severe Thunderstorm Warning	MRX	Morgan, Roane	56 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 1997 Every severe thunderstorm warning in 1997

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.