Charleston, South Carolina Weather Forecast Discussion

245
FXUS62 KCHS 100025
AFDCHS
Area Forecast Discussion
National Weather Service Charleston SC
825 PM EDT Tue Sep 9 2025
.SYNOPSIS...
Surface high pressure will prevail into the weekend.
&&
.NEAR TERM /UNTIL 6 AM WEDNESDAY MORNING/...
Tonight: The mid/upper levels will consist of weak troughing across
the Southeast United States through the night. At the sfc, a
stationary front will remain south of the region while high pressure
centered over New England builds in from the north. The pattern will
yield a dry forecast for all areas, but also cooler conditions under
few high clouds, due to light northeasterly winds and cold air
advection occurring overnight. In general, temps should dip into the
mid-upper 50s well inland to low-mid 60s for remaining areas,
warmest near the beaches.
&&
.SHORT TERM /6 AM WEDNESDAY MORNING THROUGH FRIDAY/...
Wednesday through Friday: Aloft, troughing will prevail across the
region with the trough amplifying from the Mid Atlantic southward
into Friday. At the surface, high pressure will prevail inland along
the Eastern Seaboard through the end of the week. Model consensus
continues to favor dry conditions across the forecast area with
gradually warming temperatures. For Wednesday we anticipate low to
mid 80s for southeast SC and upper 80s for southeast GA. Then for
Thursday and Friday, mid to upper 80s will be common with a few
spots hitting 90 across interior southeast GA.
&&
.LONG TERM /FRIDAY NIGHT THROUGH TUESDAY/...
Troughing should prevail through the weekend before attempting to
shift offshore early next week as ridging starts to extend in from
the west. Still not much change expected at the surface as high
pressure remains the dominant feature and we remain in a relatively
dry pattern. Overall the forecast is dry with temperatures returning
to the upper 80s and low 90s by late this weekend or early next
week.
&&
.AVIATION /01Z WEDNESDAY THROUGH SUNDAY/...
VFR conditions are expected to prevail at CHS/JZI/SAV terminals
through 00Z Thursday. Northerly winds could top out in the 10-15 kt
range at all terminals late Wednesday morning, but should gradually
weaken Wednesday afternoon.
Extended Aviation Outlook: Mostly VFR though there is a low end
potential for few periods of restricted ceilings due to late
night/early morning stratus.
&&
.MARINE...
Tonight: A stalled front will be positioned just south of the local
waters while high pressure builds in across land zones. This will
yield a pinched pressure gradient into evening hours, resulting in
northeast winds generally in the 15-20 kt, although a few gusts to
25 kt are possible beyond 10 nm from the coast through about
midnight. Seas ranging between 4-6 ft across nearshore waters will
slowly subside to 3-5 ft overnight. The improving trend should favor
Small Craft Advisories coming to an end across nearshore waters
during the second half of the night, possibly several hours prior
to 6 AM Wednesday. Seas near 6-8 ft across outer Georgia waters
will also subside, generally to 5-6 ft after midnight, but a
Small Craft Advisory will continue across outer Georgia waters
through the night.
Wednesday through Sunday: Northeast flow is expected to prevail
across the local waters through the weekend. Wind speeds should
diminish beginning Wednesday night, with a another surge expected to
return Friday into the weekend. Another round of advisories could be
needed during the weekend time period due to increased winds and
seas.
Rip Currents: The combination of persistent northeast winds,
astronomical factors, and elevated swell will yield a Moderate Risk
of rip currents at all beaches Wednesday. Another Moderate Risk at
all beaches is likely again on Thursday under similar
conditions.
&&
.TIDES/COASTAL FLOODING...
Astronomical tide levels will remain elevated through the rest of
the week due to the recent full moon and upcoming lunar perigee
(9/10). Total water levels will also be high with the tidal
departure increasing due to the pinched pressure gradient/elevated
northeast winds. As a result, a Coastal Flood Advisory remains in
effect across coastal zones of Southeast South Carolina and
Southeast Georgia until midnight tonight.
Additional Coastal Flood Advisories could be needed for saltwater
flooding during the mid-late morning high tide cycles through late
week, even though tidal departures will start to come down Thursday
into Friday as the pressure gradient beings to relax.
&&
.CHS WATCHES/WARNINGS/ADVISORIES...
GA...Coastal Flood Advisory until midnight EDT tonight for GAZ117-
     119-139-141.
SC...Coastal Flood Advisory until midnight EDT tonight for
     SCZ048>051.
MARINE...Small Craft Advisory until 6 AM EDT Wednesday for AMZ350-352-
     354.
     Small Craft Advisory until 8 PM EDT Wednesday for AMZ374.
&&
$$
NEAR TERM...DPB
SHORT TERM...BSH
LONG TERM...BSH
AVIATION...BSH/DPB
MARINE...BSH/DPB

NWS CHS Office Area Forecast Discussion