Scattered thunderstorms moved into portions of the South Carolina Piedmont during the evening. Several storms produced brief severe weather in the form of damaging winds.
Every event with a place to put it. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS GSP wrote it up.
Scattered thunderstorms moved into portions of the South Carolina Piedmont during the evening. Several storms produced brief severe weather in the form of damaging winds.
The local office's own words before the first event, 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 the first event at Aug 13, 4:09 PM EST, 1 hour 51 minutes earlier.
Area Forecast Discussion
National Weather Service Greenville-Spartanburg SC
509 PM EDT Thu Aug 13 2020
.SYNOPSIS...
Scattered to numerous showers and thunderstorms are expected over
the next few days. High temperatures will be slightly below normal
through the weekend due to ample moisture and increased cloud cover.
&&
.NEAR TERM /THROUGH FRIDAY/...
As of 5 pm EDT Thursday: Thunderstorm coverage has focused most
strongly over the NC foothills and Piedmont late this afternoon, but
outflows moving southward should permit another round of numerous
storms to develop along the southern foothills, Upstate SC, and
northeast GA through the evening hours. Although sbCAPE values
remain near 3000 J/kg late this afternoon, warm temperatures aloft
and modest lapse rates are keeping most thunderstorms from becoming
severe. Heavy rainfall will remain the primary threat given the weak
steering flow. With the residual boundaries and SELY upslope flow,
expect activity to linger well into the overnight hours.
Another similar day is expected on Friday, with comparable
instability to the past few days and a continued threat of isolated
severe thunderstorms. The bigger threat will once again be localized
flash flooding from slowly moving cells. Otherwise, high temps will
be near normal for mid-August.
&&
.SHORT TERM /FRIDAY NIGHT THROUGH SUNDAY/...
As of 200 PM EDT Thursday: A mid level trof will traverse the area
this weekend. Friday night, Saturday and Saturday night will feature
scattered to numerous showers and thunderstorms. With precipitable
water values near 2 inches and slow storm motion, some areas could
receive heavy rain and localized flooding is possible. The trof axis
will move through the area by Sunday leading to west to northwest
flow and drying across the area. Pops will be much lower on Sunday.
Due to the increased cloud cover on Saturday, highs will be limited
to the mid 80s in the Piedmont and to around 80 in the mountain
valleys. Highs will climb back into the upper 80s in the Piedmont
and lower 80s in the valleys on Sunday.
&&
.LONG TERM /SUNDAY NIGHT THROUGH THURSDAY/...
As of 200 PM EDT Thursday: Another mid level trof will develop
across the Ohio and Tennessee Valley for the early to middle part of
next week. The atmosphere will start out drier on Monday but then
moisture quickly for Tuesday and Wednesday. Thus, pops will be on
the increase through the period with locally heavy rainfall possible.
Highs will be near climo on Monday and then a few degrees below
climo for the middle part of the week due to increased clouds and
rain.
&&
.AVIATION /21Z THURSDAY THROUGH TUESDAY/...
At KCLT and Elsewhere: Another round of thunderstorms this evening
has a good chance of affecting any of the TAF sites with temporary
IFR conditions. Timing is similar to recent days, with thunderstorms
from now until after sunset. Outside of gusts from storm outflows,
winds are light and variable as a weak upper pattern is in place.
Upper pattern becomes less weak Friday afternoon as a mid-level
shortwave organizes west of the region. This is expected to increase
coverage and duration of storms for Friday afternoon, and give a
more general southwesterly wind direction in areas south of I85.
Some fog and low CIGs are also possible Friday morning, similar to
the pattern seen this morning, especially in mountain valleys
affected by recent rains.
Outlook: Above normal coverage of diurnal convection is expected thru
the upcoming weekend and into early next week. Fog and low stratus
restrictions will be possible each morning, especially over the usual
mountain valleys.
Confidence Table...
21-03z 03-09Z 09-15Z 15-18Z
KCLT High 100% High 100% Med 73% High 86%
KGSP High 100% High 100% Med 69% High 81%
KAVL High 100% High 80% Med 68% High 86%
KHKY High 100% High 97% Low 36% High 94%
KGMU High 100% High 94% High 81% Med 79%
KAND High 100% High 100% High 83% High 86%
The percentage reflects the number of guidance members agreeing
with the scheduled TAF issuance flight rule category. Complete hourly
experimental aviation forecast consistency tables are available at
the following link:
www.weather.gov/gsp/aviation
&&
.GSP WATCHES/WARNINGS/ADVISORIES...
GA...None.
NC...None.
SC...None.
&&
SYNOPSIS...SW
NEAR TERM...HG/WJM
SHORT TERM...SW
LONG TERM...SW
AVIATION...HG/WJMHazardous Weather Outlook National Weather Service Greenville-Spartanburg SC 459 PM EDT Thu Aug 13 2020 GAZ010-017-018-026-028-029-NCZ033-035>037-048>053-056>059-062>065- 068>072-082-501>510-SCZ001>014-019-142100- Rabun-Habersham-Stephens-Franklin-Hart-Elbert-Avery-Alexander- Iredell-Davie-Madison-Yancey-Mitchell-Swain-Haywood-Buncombe-Catawba- Rowan-Graham-Northern Jackson-Macon-Southern Jackson-Transylvania- Henderson-Cleveland-Lincoln-Gaston-Mecklenburg-Cabarrus-Union NC- Caldwell Mountains-Greater Caldwell-Burke Mountains-Greater Burke- McDowell Mountains-Eastern McDowell-Rutherford Mountains- Greater Rutherford-Polk Mountains-Eastern Polk-Oconee Mountains- Pickens Mountains-Greenville Mountains-Greater Oconee- Greater Pickens-Greater Greenville-Spartanburg-Cherokee-York- Anderson-Abbeville-Laurens-Union SC-Chester-Greenwood- 459 PM EDT Thu Aug 13 2020 This Hazardous Weather Outlook is for northeast Georgia, Piedmont North Carolina, western North Carolina, and Upstate South Carolina. .DAY ONE...Tonight. Scattered to numerous showers and thunderstorms will continue to develop across the region through the evening hours, with coverage slowly diminishing through the early morning hours. The primary threats with these storms will be frequent cloud to ground lightning, locally heavy rainfall, and gusty winds. Storms and heavy rain showers will occasionally become stationary, posing a threat of excessive rainfall and flash flooding, especially in locations that have received heavy rainfall over the past few days. .DAYS TWO THROUGH SEVEN...Friday through Wednesday. No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... None. HG
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</html>The Greer radar (KGSP), 30 km away, was scanning. The volume nearest the first event began at 22:58 UTC.
6 thunderstorm wind. Local standard time, as filed.
County comms reported trees blown down at the intersection of E Main St and Haywood Ave and on Beechwood Dr in east Spartanburg and on Crocker Rd east of the city.
County comms reported trees blown down on Bonner Rd.
County comms reported trees blown down on Sizemore Rd and on Stein City Rd.
County comms reported trees and power lines blown down on Zion Church Rd.
County comms reported trees blown down on Maryland Dr and on Parker Rd.
County comms reported trees blown down at the intersection of Wham Lawn Rd and Tractor Dr.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in South Carolina in 2020Every state in 2020This day in weather historyWarnings in South Carolina, August 2020
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-30. Each event’s entry at NCEI: 919402, 919404, 919416, 919408, 919412, 919424.