Scattered to numerous thunderstorms developed during the evening along a near-stationary front across the North Carolina Piedmont. Several of the storms produced gusty winds, with damage reported to a home from a downed tree in Lincoln County.
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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 to numerous thunderstorms developed during the evening along a near-stationary front across the North Carolina Piedmont. Several of the storms produced gusty winds, with damage reported to a home from a downed tree in Lincoln County.
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 Sep 1, 9:23 PM EST, 1 hour 22 minutes earlier.
Area Forecast Discussion
National Weather Service Greenville-Spartanburg SC
1023 PM EDT Tue Sep 1 2020
.SYNOPSIS...
Developing Bermuda high pressure will lead to an increase in heat
for the latter part of this week. With a cold front expected to pass
through by Saturday, unsettled and cooler weather will be seen this
weekend.
&&
.NEAR TERM /THROUGH WEDNESDAY/...
As of 1020 PM: Scattered showers and isolated thunderstorms continue
across the northern foothills and NW piedmont along the weak surface
boundary. Convection associated with an approaching weak short wave
is diminishing as it moves into the mountains. Expect the piedmont
convection to move east of the area by 06Z. An isolated shower will
be possible elsewhere as the weak short wave moves through.
Stratocu likely will form again overnight over much of NC into the
northern Upstate. Min temps will be a muggy 8-12 degrees above
normal in most spots. Overnight, a trough crossing the Great Lakes
will drag a weak cold front into the upper TN Valley. With that, and
as the ridge continues to strengthen, the low level flow will turn
westerly into our NC mountains, possibly allowing light precip or
even a stray storm in the early morning hours. The front basically
stalls along the Appalachians, leaving the weak upslope forcing in
play thru the day. While the ridge looks quite likely to suppress
convection over the Piedmont, no significant capping inversion is
expected over the mountain zones, so we will maintain a isolated to
widely scattered shower/storm mention there. Profiles will be
comparatively dry, so heavy rain will be of less concern (except
perhaps if storms anchor on ridges). NAM sfc-midlevel delta-theta-E
and DCAPE values are enough that we can't rule out an isolated
severe downburst, though the threat is not that remarkable. Max
temps will rise back 6-9 degrees above normal. Those muggy dewpoints
will continue, likely not mixing out all that much on account of the
subsidence, so heat indices are expected to break 100 over much of
the lower Piedmont, including parts of the Charlotte metro.
&&
.SHORT TERM /WEDNESDAY NIGHT THROUGH FRIDAY/...
As of 300 AM Tuesday: By Tuesday the forecast area will be under
the full influence of the Bermuda High with southeast flow aloft
acting to suppress most disturbances to our north. The net result
will be mostly sunny skies and seasonably hot conditions with
widespread low to mid 90s with heat index values peaking around 100
for the piedmont with highs in the 80s in the mountains. Increased
subsidence and warming at mid-levels associated with the Bermuda
High will greatly limit afternoon to evening showers and
thunderstorms, especially on Thursday. A disturbance passing to the
north later Wednesday may support an uptick of convection across the
northern mountains and adjacent foothills where moderate DCAPE
values and an inverted-V sounding could be supportive damaging
microburst winds. A new development in the guidance is a secondly
impulse passing to our north may nudge a frontal boundary near the
mountains Thursday night, potentially providing increasing shower
and thunderstorm chances overnight across the mountains.
&&
.LONG TERM /FRIDAY NIGHT THROUGH TUESDAY/...
As of 200 PM Tuesday...An early season cold front will push through
the area Friday night bringing a more comfortable air mass into the
region. Surface high pressure will move east of the Appalachians to
our north creating a weak damming scenario for the weekend. High
temperatures outside the higher mountains will be in the lower to
middle 80s on Saturday and the upper 70s to lower 80s on Sunday. A
few showers will be possible.
Deep mid level troffing will develop across the central part of the
country early next week. Southerly flow will lead to an increase in
convective activity and cloud cover keeping high temperatures in the
lower to middle 80s through that period.
&&
.AVIATION /03Z WEDNESDAY THROUGH SUNDAY/...
At KCLT and elsewhere: Convection has remained mainly near KAVL and
KHKY. Have kept TEMPO at KHKY where cells are very close with VCSH
elsewhere. Convection should end before midnight. Guidance coming
into better agreement on at least IFR across NC overnight with MVFR
to IFR possible over SC. Have followed these trends for TAFs
overnight and early Wednesday. Should be a quick improvement before
noon as the near-stationary front looks to be north of the area.
Stronger high pressure over the area Wednesday will preclude any
afternoon precip mention at any TAF site, but isolated convection
possible at KAVL from a front impinging on the Appalachians. SE to
SW wind this evening becomes light and variable overnight. Higher SW
wind expected Wednesday. Exceptions: KHKY will see a NE wind this
evening and KAVL will see a NW wind Wednesday.
Outlook: Afternoon/evening SHRA/TSRA remain possible again Thu,
although coverage will be below average due to strong high pressure
over the Southeast. Early morning low cloud/fog restrictions
will also be possible over the mountain valleys for several more
days. A cold front will approach from the northwest on Friday and
pass to the southeast by Saturday; drier and more settled wx may
briefly follow.
Confidence Table...
02-08Z 08-14Z 14-20Z 20-00Z
KCLT High 100% Low 55% High 100% High 100%
KGSP High 93% Low 52% High 100% High 100%
KAVL High 87% Low 42% High 100% High 100%
KHKY Med 76% Med 75% Med 77% High 100%
KGMU High 100% Low 45% High 100% High 100%
KAND High 100% High 100% High 100% High 100%
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...SCW
NEAR TERM...RWH/08
SHORT TERM...SCW
LONG TERM...SCW
AVIATION...RWHHazardous Weather Outlook National Weather Service Greenville-Spartanburg SC 1045 PM EDT Tue Sep 1 2020 NCZ035>037-056-057-068>072-082-030245- Alexander-Iredell-Davie-Catawba-Rowan-Cleveland-Lincoln-Gaston- Mecklenburg-Cabarrus-Union NC- 1045 PM EDT Tue Sep 1 2020 This Hazardous Weather Outlook is for piedmont North Carolina. .DAY ONE...Tonight. There will remain the possibility of a round of heavy showers and possibly a thunderstorm into the first half of the overnight hours before storms dissipate. Localized heavy runoff or ponding of water is probable. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. Hazardous weather is not expected at this time. .SPOTTER INFORMATION STATEMENT... None. GAZ010-017-018-026-028-029-NCZ033-048>053-058-059-062>065-501>510- SCZ001>014-019-030245- Rabun-Habersham-Stephens-Franklin-Hart-Elbert-Avery-Madison-Yancey- Mitchell-Swain-Haywood-Buncombe-Graham-Northern Jackson-Macon- Southern Jackson-Transylvania-Henderson-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- 1045 PM EDT Tue Sep 1 2020 This Hazardous Weather Outlook is for northeast Georgia, western North Carolina and upstate South Carolina. .DAY ONE...Tonight. No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... None.
The national radar mosaic for the moment the first event began.
1 heavy rain, 1 thunderstorm wind. Local standard time, as filed.
Spotter reported that poor drainage caused water to enter and damage a home on Dale Ave after 2 to 3 inches of rain fell across central Lincoln County in just a couple of hours.
Amateur radio reported a tree blown and causing extensive damage to a house on Lands End Trail in the Alexis community.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in North Carolina in 2020Every state in 2020This day in weather historyWarnings in North Carolina, September 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 2026-09-24. Each event’s entry at NCEI: 922138, 921842.