Three Mile, North Carolina Weather Forecast Discussion

928
FXUS62 KGSP 071736
AFDGSP
Area Forecast Discussion
National Weather Service Greenville-Spartanburg SC
136 PM EDT Sun Sep 7 2025
.SYNOPSIS...
In the wake of a departing cold front, broad surface high pressure
will spread over the region and linger through most of the week.
This will bring fair weather and below normal temperatures.
&&
.NEAR TERM /THROUGH MONDAY/...
As of 135 PM EDT Sunday: An isolated shower or storm can`t be ruled
out over the Upper Savannah River valley this afternoon where a weak
inverted trough will lead to low level convergence and moisture
pooling. Otherwise, a dry forecast is expected. Gusty winds continue
across the mountains with an occasional low end gust elsewhere.
Low clouds linger across the area then dissipate by early evening.
That said, guidance is mixed on whether low clouds hold on or
redevelop overnight. Drier air does work in by evening, so show some
clouds early then dissipate them over most of the area.  Dry
conditions expected elsewhere. Winds diminish most locations during
the evening but pick back up across the Upstate and NE GA becoming
gusty overnight. Lows will be 5 to 10 degrees below normal.
Any clouds dissipate by afternoon with sunny and dry conditions for
the afternoon. Gusty NE winds expand across the NC foothills and
Piedmont as mixing takes place. Highs will be 5 to 10 degrees below
normal.
&&
.SHORT TERM /MONDAY NIGHT THROUGH WEDNESDAY/...
As of 1:20 PM EDT Sunday: The short-term forecast picks up at 00z on
Tuesday with upper trofing lifting northward with heights rebounding
over our area. Over the next couple of days, the large-scale upper lvl
pattern will gradually amplify again as broad upper trofing digs down
over Ontario and Quebec and upper ridging amplifies over the central
CONUS. At the sfc, broad high pressure will be in place across the
eastern CONUS as the period begins late Monday. Over the next couple
of days the center of the high will gradually migrate NE, yet it will
continue to control our sfc pattern thru the end of the period late
Wednesday. A weak sfc low tries to develop within the baroclinic zone
just off the SE Coast on Wednesday, however most of the latest guidance
keeps any deeper moisture associated with this system to our east. As
for the sensible fcst, we should remain dry with below-normal tempera-
tures each day.
&&
.LONG TERM /WEDNESDAY NIGHT THROUGH SUNDAY/...
As of 1:10 PM EDT Sunday: The extended fcst picks up at 00z on
Thursday with upper trofing amplifying again over New England
as stout upper ridging persists to our west over the central
CONUS. Over the next few days, most of the long-range guidance
has some amount of upper trofing lingering well to our north
as the upper ridge gradually spreads further east and into our
area by the end of the period. At the sfc, broad high pressure
will still be lingering across most of the eastern CONUS as the
period begins late Wednesday. A weak sfc low will develop within
the baroclinic zone just off the Atlantic Coast and track north-
ward on Thursday, eventually moving out over the north Atlantic
by early Friday. At the same time, another robust sfc high will
migrate SE from Canada and spread another round of dry air back
over the eastern CONUS. Overall, the fcst remains largely unchanged
with dry conditions expected thru the period. Temperatures have
trended a bit warmer, but are still fcst to remain just below
climatology for early September.
&&
.AVIATION /18Z SUNDAY THROUGH FRIDAY/...
At KCLT and elsewhere: MVFR cigs will continue until 20Z or so at
KCLT when they lift to low VFR. Low VFR cigs continue at KHKY
through the afternoon. Elsewhere, SCT low VFR through the afternoon
with a TEMPO MVFR cig through 20Z. A shower or storm is possible at
KAND this afternoon, but chance too low for the TAF. Guidance is
mixed on whether low VFR or even MVFR clouds redevelop overnight.
Have left out for now due to drier air moving in. This will also
limit fog potential to all but the normally more foggy mountain
valleys. Mostly clear skies expected on Monday. NE wind this
afternoon, with brief low end gusts, for all but KAND where ESE wind
expected, and KAVL where gusty NW wind continues. Winds diminish
overnight for all but the SC sites where NE wind and potential gusts
continue. Gusty NE wind expected with mixing on Monday, except for
KAVL where light N wind becomes light SE.
Outlook: Dry high pressure is expected through the week. Fog and/or
low stratus is possible each morning, especially in the favored
mountain valleys.
&&
.GSP WATCHES/WARNINGS/ADVISORIES...
GA...None.
NC...None.
SC...None.
&&
$$
SYNOPSIS...JK
NEAR TERM...RWH
SHORT TERM...JPT
LONG TERM...JPT
AVIATION...RWH

NWS GSP Office Area Forecast Discussion