Alert archive / South Carolina / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 126, NWS Greenville-Spartanburg, SC

May 28, 2020Greenville County, Laurens County, South Carolina

NWS Greenville-Spartanburg, SC issued this severe thunderstorm warning at May 28, 2020, 7:48 PM EDT for Greenville County, Laurens County, South Carolina. It was in force for 42 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 28, 2020, 7:48 PM EDT (23:48 UTC)
Expired: May 28, 2020, 8:30 PM EDT
In force: 42 min
Issued by: NWS Greenville-Spartanburg, SC
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Greenville County, SC, Laurens County, SC

The radar

The Greer radar (KGSP), 22 km from the middle of the area, began a volume at 23:52 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, 11.8 hours before the alert went out and 259 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: 528 J/kg
Mixed-layer CIN: -11 J/kg
Mixed-layer LCL: 525 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 93 m²/s²
0-3 km storm-relative helicity: 170 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 2.0

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 May 28, 4:56 PM EDT, 2 hours 52 minutes earlier.

Area forecast discussion, May 28, 4:56 PM EDT, 2 hours 52 minutes before

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Hazardous weather outlook, May 28, 4:31 PM EDT, 3 hours 17 minutes before

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In the hours before

Special weather statement, May 28, 1:57 PM EDT, 5 hours 51 minutes before

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Special weather statement, May 28, 1:59 PM EDT, 5 hours 49 minutes before

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Special weather statement, May 28, 5:51 PM EDT, 1 hour 57 minutes before

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Special weather statement, May 28, 6:58 PM EDT, 50 minutes before

Special Weather Statement
National Weather Service Greenville-Spartanburg SC
658 PM EDT Thu May 28 2020

NCZ035-502-282330-
Greater Caldwell NC-Alexander NC-
658 PM EDT Thu May 28 2020

...A STRONG THUNDERSTORM WILL IMPACT WESTERN ALEXANDER AND EASTERN
CALDWELL COUNTIES UNTIL 730 PM EDT...

At 658 PM EDT, Doppler radar was tracking a strong thunderstorm 9
miles west of Taylorsville, or 6 miles east of Cedar Rock, moving
north at 25 mph.

Locations to be impacted include...
Cedar Rock, Ellendale, Kings Creek and Little River In Alexander
County.

Wind gusts up to 45 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.

&&

LAT...LON 3605 8139 3604 8137 3602 8134 3600 8133
      3601 8131 3601 8129 3603 8127 3603 8121
      3584 8122 3583 8144 3603 8148 3607 8141
TIME...MOT...LOC 2258Z 177DEG 22KT 3591 8134

RWH

Special weather statement, May 28, 7:26 PM EDT, 22 minutes before

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Special weather statement, May 28, 7:36 PM EDT, 12 minutes before

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The office that day

Everything else NWS Greenville-Spartanburg, SC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 27, 8:39 PM EDT	Areal Flood Advisory	GSP	Iredell, Lincoln, Mecklenburg	3 hr
May 27, 9:46 PM EDT	Areal Flood Warning	GSP	Cabarrus	24 hr
May 27, 10:06 PM EDT	Areal Flood Warning	GSP	Mecklenburg	4 hr
May 28, 2:47 AM EDT	Areal Flood Advisory	GSP	Mecklenburg	3 hr
May 28, 3:29 AM EDT	Areal Flood Advisory	GSP	Rowan	29 hr
May 28, 5:50 AM EDT	Areal Flood Advisory	GSP	Davie, Iredell	6 hr
May 28, 3:09 PM EDT	Severe Thunderstorm Warning	GSP	Cabarrus, Mecklenburg, Union	51 min
May 28, 3:28 PM EDT	Areal Flood Advisory	GSP	Mecklenburg, Union	3 hr
May 28, 6:58 PM EDT	Special Weather Statement	GSP	Caldwell	32 min
May 28, 7:26 PM EDT	Special Weather Statement	GSP	Cabarrus	34 min
May 28, 7:43 PM EDT	Areal Flood Advisory	GSP	Cabarrus, Mecklenburg, Union	2 hr
May 28, 7:55 PM EDT	Severe Thunderstorm Warning	GSP	Cabarrus, Rowan	50 min
May 28, 11:42 AM EDT	Special Weather Statement	GSP	Anderson	33 min
May 28, 12:04 PM EDT	Special Weather Statement	GSP	Greenville	26 min
May 28, 12:27 PM EDT	Special Weather Statement	GSP	Greenville	33 min
May 28, 12:54 PM EDT	Special Weather Statement	GSP	Spartanburg	36 min
May 28, 1:21 PM EDT	Special Weather Statement	GSP	York	24 min
May 28, 1:30 PM EDT	Special Weather Statement	GSP	Pickens	30 min
May 28, 1:37 PM EDT	Severe Thunderstorm Warning	GSP	York	22 min
May 28, 1:57 PM EDT	Special Weather Statement	GSP	Greenville	33 min
May 28, 1:59 PM EDT	Special Weather Statement	GSP	York	31 min
May 28, 2:42 PM EDT	Areal Flood Advisory	GSP	York	6 hr
May 28, 5:51 PM EDT	Special Weather Statement	GSP	Abbeville	24 min
May 28, 7:36 PM EDT	Special Weather Statement	GSP	Greenville	24 min

Nearby

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.