Alert archive / North Carolina / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 293, NWS Greenville-Spartanburg, SC

August 7, 2020Cleveland County, Gaston County, Lincoln County, North Carolina; Cherokee County, York County, South Carolina

NWS Greenville-Spartanburg, SC issued this severe thunderstorm warning at Aug 7, 2020, 8:51 PM EDT for Cleveland County, Gaston County, Lincoln County, North Carolina; Cherokee County, York County, South Carolina. It was in force for 39 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 7, 2020, 8:51 PM EDT (00:51 UTC)
Expired: Aug 7, 2020, 9:30 PM EDT
In force: 39 min
Issued by: NWS Greenville-Spartanburg, SC
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Cleveland County, NC, Gaston County, NC, Lincoln County, NC, Cherokee County, SC, York County, SC

The radar

The Greer radar (KGSP), 88 km from the middle of the area, began a volume at 00:55 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

Roanoke, VA (KRNK), launched 00:00Z, 0.9 hours before the alert went out and 275 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: 758 J/kg
Mixed-layer CIN: -26 J/kg
Mixed-layer LCL: 1072 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 33 m²/s²
0-3 km storm-relative helicity: 48 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.1

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 Greenville-Spartanburg, SC wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 7, 8:12 PM EDT, 39 minutes earlier.

Area forecast discussion, Aug 7, 8:12 PM EDT, 39 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>

Hazardous weather outlook, Aug 7, 6:26 AM EDT, 14 hours 25 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, Aug 7, 6:00 PM EDT, 2 hours 51 minutes before

Special Weather Statement
National Weather Service Greenville-Spartanburg SC
600 PM EDT Fri Aug 7 2020

NCZ048-049-072230-
Yancey NC-Madison NC-
600 PM EDT Fri Aug 7 2020

...A STRONG THUNDERSTORM WITH INTENSE LIGHTNING WILL IMPACT EAST
CENTRAL MADISON AND CENTRAL YANCEY COUNTIES UNTIL 630 PM EDT...

At 600 PM EDT, Doppler radar was tracking a strong thunderstorm with
intense lightning 7 miles west of Burnsville. This storm was nearly
stationary.

Locations to be impacted include...
Burnsville, Ramseytown, Swiss, Wolf Ridge, Green Mountain and Faust.

In addition to intense lightning, wind gusts up to 45 mph, pea size
hail and very heavy rainfall rates up to 2 inches per hour will be
possible in these areas.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall may flood areas with poor drainage, such as
ditches and underpasses. Avoid these areas and do not cross flooded
roads. Water levels of small streams may also rise rapidly. Seek
higher ground if threatened by flood waters.

Frequent lightning is occurring with this storm. If outdoors, try to
get indoors or into a hard topped vehicle. Otherwise, stay away from
open areas and isolated high objects such as trees. When indoors,
stay away from windows and doors and avoid using wired electronic
devices. Do not take a shower or bath. Try to unplug unnecessary
appliances before the storm approaches.

&&

LAT...LON 3602 8227 3600 8227 3599 8226 3576 8229
      3577 8234 3580 8234 3582 8236 3582 8238
      3581 8244 3581 8246 3580 8247 3582 8253
      3598 8251 3601 8247 3603 8228
TIME...MOT...LOC 2200Z 275DEG 4KT 3591 8243

RWH

Special weather statement, Aug 7, 6:21 PM EDT, 2 hours 30 minutes before

Special Weather Statement
National Weather Service Greenville-Spartanburg SC
621 PM EDT Fri Aug 7 2020

NCZ056-504-072245-
Greater Burke NC-Catawba NC-
621 PM EDT Fri Aug 7 2020

...A STRONG THUNDERSTORM WITH INTENSE LIGHTNING WILL IMPACT WESTERN
CATAWBA AND EAST CENTRAL BURKE COUNTIES UNTIL 645 PM EDT...

At 621 PM EDT, Doppler radar was tracking a strong thunderstorm with
intense lightning near Hickory, or over Longview. This storm was
nearly stationary.

Locations to be impacted include...
Hickory, Newton, St. Stephens, Longview, Icard, Hildebran, Rhodhiss,
Hickory Regional Airport, Mountain View and Lake Hickory.

In addition to intense lightning, wind gusts up to 50 mph and pea
size hail will be possible in these areas.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Gusty winds can blow down trees that are dead, or that have weakened
root systems. Outdoor furniture and similar items can be tossed
around if not anchored. Seek shelter indoors.

Torrential rainfall may flood areas with poor drainage, such as
ditches and underpasses. Avoid these areas and do not cross flooded
roads. Water levels of small streams may also rise rapidly. Seek
higher ground if threatened by flood waters.

Frequent lightning is occurring with this storm. If outdoors, try to
get indoors or into a hard topped vehicle. Otherwise, stay away from
open areas and isolated high objects such as trees. When indoors,
stay away from windows and doors and avoid using wired electronic
devices. Do not take a shower or bath. Try to unplug unnecessary
appliances before the storm approaches.

&&

LAT...LON 3557 8124 3564 8148 3579 8146 3576 8140
      3576 8138 3577 8135 3578 8136 3580 8134
      3580 8130 3581 8126 3582 8125 3581 8122
      3582 8121
TIME...MOT...LOC 2221Z 275DEG 4KT 3573 8139

RWH

Special weather statement, Aug 7, 7:00 PM EDT, 1 hour 51 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 7, 7:18 PM EDT, 1 hour 33 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 7, 7:28 PM EDT, 1 hour 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>

Special weather statement, Aug 7, 7:29 PM EDT, 1 hour 22 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
Aug 8, 5:13 PM EDT	Special Weather Statement	GSP	Caldwell	32 min
Aug 8, 6:29 PM EDT	Special Weather Statement	GSP	Polk	31 min
Aug 8, 6:58 PM EDT	Special Weather Statement	GSP	Polk	32 min
Aug 7, 9:59 PM EDT	Special Weather Statement	GSP	Union	31 min
Aug 7, 10:52 PM EDT	Special Weather Statement	GSP	Anderson	38 min
Aug 7, 10:55 PM EDT	Special Weather Statement	GSP	Anderson	50 min
Aug 8, 5:34 PM EDT	Special Weather Statement	GSP	Oconee	26 min
Aug 8, 7:15 PM EDT	Special Weather Statement	GSP	Oconee	30 min

Nearby

Severe Thunderstorm Warnings in North Carolina, 2020 Severe Thunderstorm Warnings in South Carolina, 2020 Every 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.