349
FXUS62 KCHS 010619
AFDCHS

Area Forecast Discussion
National Weather Service Charleston SC
219 AM EDT Mon Sep 1 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 will attempt to become
cutoff across the Mid-Atlantic states, supporting a dry westerly
flow across the Southeast United States. At the sfc, high pressure
will continue to strengthen while building south into the local
area, while broad troughing prevails offshore. The pattern will
support dry conditions for all areas while north/northeasterly winds
favor below normal temperatures despite ample sunshine. In general,
high temps should range in the low-mid 80s, warmest across Southeast
Georgia away from the beaches. These temps along with a fairly
pinched pressure gradient across the local area should result in
breezy conditions along the coastal corridor late morning and
afternoon, with wind gusts peaking near 20-25 mph.

Tonight: Very little change will occur in the overall pattern with
high pressure persisting locally. 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/lower 70s near the coast (warmest along the
beaches).

&&

.SHORT TERM /TUESDAY THROUGH THURSDAY/...
Surface high pressure to the north will gradually weaken Tuesday
through Thursday. Relatively dry PWs will persist inland Tuesday
and Wednesday before things start to moisten back up on
Thursday. Temps will return to near normal by Thursday. Little
in the way of convection is expected Tuesday and Wednesday with
isolated showers/tstms confined to coastal areas. Greater
moisture and some upper shortwave energy may allow for scattered
diurnal convection on Thursday.

&&

.LONG TERM /THURSDAY NIGHT THROUGH SUNDAY/...
Atlantic high pressure will rebuild Friday and Saturday, then a
cold front could move through Sunday morning. Above normal
temperatures expected Friday and Saturday though there will be
little forcing for convection. A few showers or tstms will be
possible Sunday as the front drops into the area.

&&

.AVIATION /06Z MONDAY THROUGH FRIDAY/...
VFR conditions are expected to prevail at CHS/JZI/SAV terminals
through 06Z Tuesday. North/northeast wind gusts around 20 kt are
possible at all terminals starting mid-late morning and should
persist into late afternoon.

Extended Aviation Forecast: Mainly VFR.

&&

.MARINE...
Today and Tonight: The pressure gradient will remain enhanced across
local waters between strengthening high pressure inland and low
pressure offshore. The pattern will continue to support Small Craft
Advisory level conditions across all waters outside the Charleston
Harbor through this evening, before the pressure gradient begins to
show signs of relaxing during the second half of the night.
North/northeasterly winds gusting up to 25-30 kt will be common for
a good portion of the day off the coast, but then will weaken late
day and generally range between 15-20 kt during the night. Seas will
be slower to respond once winds weaken, but will generally range in
the 5-8 ft range this morning through the afternoon (largest across
outer Georgia waters), before subsiding to 3-5 ft across nearshore
waters and 4-6 ft across outer Georgia waters overnight. For this
reason, Small Craft Advisories should eventually come down across
nearshore waters around midnight tonight, then near daybreak across
outer Georgia waters.

NE flow will continue through Thursday as surface high pressure
remains to the north, however the gradient and thus wind speeds
should remain below advisory thresholds. The flow turns
southerly late week into the weekend.

Rip Currents: Moderate swell, enhanced onshore flow, and above
average tidal range will result in a high risk for rip currents
today and a moderate risk on Tuesday.

&&

.TIDES/COASTAL FLOODING...
Persistent NE flow will maintain positive tidal anomalies of
+1.0 to +1.4 ft through at least Wednesday. These could push
tide levels at Charleston within a few tenths of a foot of minor
flood stage during the afternoon high tides. A slight increase
in the anomalies may result in flooding.

&&

.CHS WATCHES/WARNINGS/ADVISORIES...
GA...High Risk for Rip Currents from 8 AM EDT this morning through this
     evening for GAZ117-119-139-141.
SC...High Risk for Rip Currents from 8 AM EDT this morning through this
     evening for SCZ048>051.
MARINE...Small Craft Advisory until midnight EDT tonight for AMZ350-352-
     354.
     Small Craft Advisory until 8 AM EDT Tuesday for AMZ374.

&&

$$

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