Anderson, South Carolina 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

312
FXUS62 KGSP 201111
AFDGSP

Area Forecast Discussion
National Weather Service Greenville-Spartanburg SC
611 AM EST Sat Dec 20 2025

.SYNOPSIS...
Dry high pressure builds in today, then a dry cold front cross
the area from the north on Sunday. A warm front may bring small
chances of mountain precipitation in the middle of next week,
otherwise, dry weather can be expected with a warming temperature
trend through the end of the week.

&&

.NEAR TERM /THROUGH TONIGHT/...
As of 1230 am Saturday: A fast, quas-zonal upper flow pattern will
prevail across the Conus through the near term, with a low-amplitude
trough expected to become established across the East late in
the period, as a speed max brushes the northeast quadrant of
the country. The leading edge of an associated frontal zone is
expected to be on the CWA`s doorstep at the end of the period,
but with broad surface ridging over the Southeast and Gulf cutting
off any substantive pre-frontal moisture return, the front will
be dry. Speaking of dry, low afternoon RH will be the headline
for the near term, as some of the very dry air aloft should mix
down to the surface this afternoon, with RH likely dipping into
the 22-27% range across much of the area. Temps this afternoon
through tonight are forecast to be slightly above normal.

&&

.SHORT TERM /SUNDAY THROUGH MONDAY NIGHT/...
As of 1200 AM EST Friday:

Key Message #1: Warm and dry Sunday. A dry cold front will bring
a brief cooldown and low RH for Monday.

A flat upper trough will cross the Ohio Valley to the Mid-Atlantic
Coast Sunday, with an associated dry cold front slipping in from the
northwest during the day. No mentionable PoPs will be carried with
this fropa, due to lack of moisture. Breezy conditions expected thru
Sunday aftn and evening, mainly in the mountains. Temps will be near
normal in the mountains, but 5 to 10 deg above normal east of the
mountains, thanks to downslope warming negating the low-level CAA.

A 1036 mb sfc high will slide from the Ohio Valley to eastern NC on
Monday. This should result in less wind than Sunday, with a return
to slightly below normal temps under sunny skies. The air mass will
be very dry, and aftn RH values may drop below 25% across most of
the Piedmont and lower mountain valleys. This may cause increased
fire danger if fuels have dried out enough since recent rainfall.

Key Message #2: Small precip chances may return to the mountains
before daybreak Tuesday.

The center of the cool, dry high pres will slide off the Carolina
Coast Monday night, allowing increased SWLY return flow to set up
atop the forecast area. A plume of Gulf moisture will extend from
the Lower MS Valley into KY and TN around the western periphery
of the high. Forecast soundings near the TN/NC show deep enough
moisture to support at least a slgt chc of precip before 12z
Tuesday. Temps will likely fall below freezing Monday evening
across most of the mountains before clouds and WAA increase
overnight. Pockets of sub-freezing temps may overlap PoPs just
enough for a non-zero threat of patchy freezing rain. But temps
will quickly warm above freezing early Tuesday morning and QPF
will be spotty and very light. So no little to no ice accretions
are expected. Dry conditions with increasing clouds elsewhere with
lows near normal.

&&

.LONG TERM /TUESDAY THROUGH FRIDAY/...
As of 1230 AM EST Friday:

Key Message: Significant warming trend through the week, with
well-above normal temperatures for Christmas Day and the day
after Christmas.

An upper ridge will steadily build over the central CONUS with the
axis remaining nearly stationary through at least Thursday. A warm
and generally dry westerly to northwesterly flow regime will persist
across the region. There will be some moisture banking up against
the NC mountains near the TN border at times, mainly Tuesday thru
Tuesday night. Temps look too warm for any wintry p-type concerns,
with just some spotty light rain possible. Downslope flow will
limit PoPs elsewhere thru the end of the week. The bigger story
will be the temps. Tuesday looks to be a few deg above normal,
then warm to 10-15 deg above normal Wednesday and 15-20 deg above
normal for Christmas Day. Friday (day after Christmas) may be
the warmest day of the week, with the latest National Blend of
Models showing temps in the low to mid 70s east of the mountains
(about 20+ deg above normal). Unfortunately, this pattern means
no white Christmas for any part of the forecast area this year.

&&

.AVIATION /12Z SATURDAY THROUGH WEDNESDAY/...
At KCLT and elsewhere: A dry air mass will support continued VFR
conditions through this forecast period. In fact, other than FEW/SCT
thin high clouds, SKC is expected to prevail. Light/variable winds
early will become light S/SW by early afternoon...becoming briefly
light variable again late tonight/early Sunday, with light NW
winds expected to develop late Sunday morning.

Outlook: Generally VFR conditions continue through Monday. Low
end gusty winds possible with a dry cold front Sunday. A weak
front may bring small chances for rain and restrictions Tuesday
into Wednesday.

&&

.GSP WATCHES/WARNINGS/ADVISORIES...
GA...None.
NC...None.
SC...None.

&&

$$

SYNOPSIS...ARK
NEAR TERM...JDL
SHORT TERM...ARK
LONG TERM...ARK
AVIATION...JDL