184
FXUS62 KCHS 020958
AFDCHS

Area Forecast Discussion
National Weather Service Charleston SC
558 AM EDT Tue Sep 2 2025

.SYNOPSIS...
High pressure will extend across the area through late week. A
cold front will approach from the northwest late in the
weekend.

&&

.NEAR TERM /THROUGH TONIGHT/...
Today: Aloft, a large area of low pressure centered across the Mid-
Atlantic and Northeast states should gradually phase with an
incoming trough from Canada, supporting a westerly flow to continue
across the Southeast United States throughout the day. At the sfc,
high pressure will continue to hold across the local area while
troughing persists, but gradually nudges further offshore. The
pattern supports dry weather conditions across most areas with the
exception occurring across coastal Georgia, where moisture (PWATs
near 1.5 inches) along the western edge of low pressure could
support an isolated shower/thunderstorm this afternoon for any
coastal activity that attempts to drift onshore. The window for this
activity is likely limited to early/mid afternoon hours during peak
diurnal heating. Winds could also become a bit breezy along the
beaches (15-25 mph) mid-late morning into early afternoon prior to
the pressure gradient weakening in response to low pressure drifting
further offshore. Despite an ongoing northeasterly wind, ample
sunshine should allow temps to peak in the low-mid 80s this
afternoon, warmest across Southeast Georgia.

Tonight: Very little change occurs in the overall pattern with high
pressure persisting, but slowly weakening overnight. Expect all
areas to remain dry through the night. Light northeasterly winds
under mostly clear skies should support overnight lows generally in
the low-mid 60s inland to upper 60s/around 70 near the coast
(warmest along the beaches).

&&

.SHORT TERM /WEDNESDAY THROUGH FRIDAY/...
Weak high pressure will remain northeast of the region Wednesday
through Friday. A shortwave moving through late Thursday
afternoon could spur isolated convection across coastal
southeast GA. Otherwise, a relative lack of forcing and limited
deep moisture should maintain mostly dry conditions through the
period. Temps will rise a few degrees each day as upper heights
increase.

&&

.LONG TERM /FRIDAY NIGHT THROUGH MONDAY/...
Mainly dry and warm weather expected through Saturday due to
deep layered ridging. A backdoor cold front may drop into the
area Sunday, pushing south as a wedge of high pressure builds
from the north. A wet pattern may develop by early next week as
coastal troughing sets up.

&&

.AVIATION /10Z TUESDAY THROUGH SATURDAY/...
VFR conditions will prevail at CHS/JZI/SAV terminals through 06Z
Wednesday. North/northeast winds could gust up to 15-20 kt at all
terminals mid-late morning into early/mid afternoon.

Extended Aviation Forecast: VFR.

&&

.MARINE...
Today: The pressure gradient remains enhanced across local
waters between high pressure inland and low pressure offshore
early morning, likely to be slow to relax during the day. As a
result, Small Craft Advisories have been extended across all
nearshore waters until noon. Outer Georgia waters will continue
to see Small Craft Advisory level conditions through the day. In
general, northeasterly winds should decrease to the 15-20 kt
range across nearshore waters late morning, although a few gusts
to 25 kt are possible into early afternoon. Seas should also
subside from 4-6 ft to 3-5 ft across nearshore waters by the
afternoon. Further offshore, Small Craft Advisory level
conditions are expected to persist for much of the day as the
pressure gradient remains slightly stronger away from the coast
and seas are slower to subside. Here, northeasterly winds in the
20-25 kt along with seas in the 5-6 ft range are expected.

Tonight: Low pressure across the Atlantic will begin to drift
further offshore, resulting in a a slightly weaker pressure gradient
across local waters. Winds should decrease and seas subside as a
result. In general, northeasterly winds in the 15-20 kt range this
evening should weaken to 10-15 kt across a majority of local waters
after midnight, although a few gusts to 20 kt remain possible across
outer Georgia waters. Seas will generally range between 2-4 ft
across nearshore waters and 3-5 ft across outer Georgia waters.

High pressure will prevail Wednesday through Saturday, keeping
marine conditions below advisory levels.

Rip Currents: Moderate swell, enhanced onshore flow, and above
average tidal range will result in a Moderate Risk for rip
currents along all beaches today.

&&

.TIDES/COASTAL FLOODING...
The astronomical tide levels steadily increase through the week
though the positive anomalies should start to come down by Wed
or Thu as the NE flow turns to the SE and weakens. We could come
close to 7.0 ft MLLW at Charleston for the late afternoon/early
evening high tides Wednesday through Saturday.

&&

.CHS WATCHES/WARNINGS/ADVISORIES...
GA...None.
SC...None.
MARINE...Small Craft Advisory until noon EDT today for AMZ350-352-354.
     Small Craft Advisory until 8 PM EDT this evening for AMZ374.

&&

$$

NEAR TERM...DPB
SHORT TERM...JRL
LONG TERM...JRL
AVIATION...DPB/JRL
MARINE...DPB/JRL