Alert archive / South Carolina / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 31, NWS Greenville-Spartanburg, SC

May 6, 1999Greenwood County, South Carolina

NWS Greenville-Spartanburg, SC issued this severe thunderstorm warning at May 6, 1999, 1:50 PM EDT for Greenwood County, South Carolina. It was in force for 25 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: May 6, 1999, 1:50 PM EDT (17:50 UTC)
Expired: May 6, 1999, 2:15 PM EDT
In force: 25 min
Issued by: NWS Greenville-Spartanburg, SC
Area: Whole counties

County Greenwood County, SC

The radar

The Greer radar (KGSP), 82 km from the middle of the area, began a volume at 17:49 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 watch it was issued in

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

Issued	Product	Office	Lasted
May 6, 12:00 PM EDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 5.8 hours before the alert went out and 236 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: 736 J/kg
Mixed-layer CIN: -11 J/kg
Mixed-layer LCL: 690 m above ground
0-6 km bulk shear: 62 kt
0-1 km storm-relative helicity: 166 m²/s²
0-3 km storm-relative helicity: 189 m²/s²
Significant tornado parameter: 0.8
Supercell composite: 3.0

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 Greenville-Spartanburg, SC wrote its last area forecast discussion before this severe thunderstorm warning went out at May 6, 10:10 AM EDT, 3 hours 40 minutes earlier.

Area forecast discussion, May 6, 10:10 AM EDT, 3 hours 40 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

Local storm report, May 6, 11:53 AM EDT, 1 hour 57 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 Greenville-Spartanburg, SC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 6, 1:52 AM EDT	Severe Thunderstorm Warning	GSP	Macon	48 min
May 6, 1:59 AM EDT	Severe Thunderstorm Warning	GSP	Swain	51 min
May 6, 2:28 AM EDT	Severe Thunderstorm Warning	GSP	Jackson	47 min
May 6, 2:49 AM EDT	Severe Thunderstorm Warning	GSP	Haywood	36 min
May 6, 5:05 AM EDT	Severe Thunderstorm Warning	GSP	Jackson	35 min
May 6, 5:30 AM EDT	Severe Thunderstorm Warning	GSP	Haywood	30 min
May 6, 6:04 AM EDT	Severe Thunderstorm Warning	GSP	Buncombe	36 min
May 6, 6:22 AM EDT	Tornado Warning	GSP	Buncombe, McDowell, Yancey	33 min
May 6, 11:39 AM EDT	Severe Thunderstorm Warning	GSP	Laurens	46 min
May 6, 12:00 PM EDT	Severe Thunderstorm Warning	GSP	Union	50 min
May 6, 1:18 AM EDT	Severe Thunderstorm Warning	GSP	Rabun	32 min

Nearby

Severe Thunderstorm Warnings in South Carolina, 1999 Every severe thunderstorm warning in 1999

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.