Hanahan, South Carolina 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

935
FXUS62 KCHS 101611
AFDCHS

Area Forecast Discussion
National Weather Service Charleston SC
1211 PM EDT Tue Jun 10 2025

.SYNOPSIS...
A cold front will approach the region and stall mid-week. High
pressure will prevail late week into the weekend.

&&

.NEAR TERM /THROUGH TONIGHT/...
A potent upper shortwave drove an MCS through the area this
morning. Only some residual light to moderate rain now exists
across northern and western portions of the area. Evaporational
cooling followed by extensive cloud cover has resulted in
surface temps now only in the lower 70s in most spots. The
boundary layer has been overturned by the convection and until
we start to see breaks in the cloud cover, airmass recovery may
not occur until late this afternoon, if at all. A few showers or
tstms could still pop up through the remainder of the afternoon,
but we expect coverage to be pretty limited.

&&

.SHORT TERM /WEDNESDAY THROUGH FRIDAY/...
Surface high pressure will reside offshore through late week,
while a weak front meanders over the region before largely
washing out. Aloft, a trough over the East Coast will continue
to lift, allowing ridging to build from the south. Expect daily
shower and thunderstorm chances with highest coverage in the
afternoon when instability is maximized. No particularly stand-
out day for severe weather, but a stronger storm or two will be
possible each day, especially where boundary interactions occur.
Highs will peak in the upper 80s to around 90. Lows on average
will be in the 70-75F range, with some spots dipping into the
upper 60s inland.

&&

.LONG TERM /FRIDAY NIGHT THROUGH MONDAY/...
Mid level ridging will largely persist over the Southeast into
the weekend and early next week, although a couple weak
disturbances could pass through the region. Surface high
pressure will reside offshore while a front possibly approaches
later in the period. Forecast is pretty much on repeat with
showers and thunderstorms possible each day, with coverage
peaking during the daytime hours. Heat indices start creeping
back up, reaching 100-105 in many spots.

&&

.AVIATION /16Z TUESDAY THROUGH SATURDAY/...
KCHS and KJZI: VFR conditions are in place and should prevail
through the TAF period. The first concern is for an area of
showers and storms that are starting to move into southeast GA
and should be on track to potentially reach the terminals around
15-16z. However, it is unclear if these showers and storms will
hold together all the through the late morning. We have
introduced prevailing showers starting at 16z. These showers and
storms could have a stabilizing effect that will have
implications for thunderstorm chances later this afternoon. We
still think the atmosphere should be able to recover and have
maintained VCTS starting at 20z, but confidence is low. If the
terminals are directly impacted by a shower or thunderstorms,
brief MVFR or IFR conditions will be possible.

KSAV: An area of IFR ceilings has settled in and we have
initialized the TAF with TEMPO IFR from 12-14z. The next issue
concerns an area of showers and storms approaching from the
southwest. These showers and storms could reach the terminal
around 13-14z and we have added a TEMPO from 14-16z for thunder
and MVFR conditions. These showers and storms could have a
stabilizing effect that will have implications for thunderstorm
chances later this afternoon. We still think the atmosphere
should be able to recover and have maintained VCTS starting at
18z, but confidence is low. If the terminals are directly
impacted by a shower or thunderstorms, brief MVFR or IFR
conditions will be possible.

Extended Aviation Forecast: Diurnally driven showers and
thunderstorms could bring temporary flight restrictions through
the week, mainly in the afternoon hours.

&&

.MARINE...
Today and tonight: Similar to the last few days, we expect
elevated southwesterly flow across the local waters today and
through the evening. However, speeds look to be a little weaker
with not quite as much gustiness. The forecast advertises winds
peaking at 15-20 knots in the Charleston County waters and
Charleston Harbor, likely just below Small Craft Advisory
thresholds. Seas should generally average 2-4 feet through the
period. Also, it is worth noting that thunderstorms are expected
along the coast and could move out into the coastal waters at
times, producing strong wind gusts.

Wednesday through Sunday: Marine conditions are expected to
stay below Small Craft Advisory criteria through the period.
Southerly flow will persist with speeds 15 knots or less. Seas
will average 2- 3 feet.

&&

.CHS WATCHES/WARNINGS/ADVISORIES...
GA...None.
SC...None.
MARINE...None.

&&

$$

NEAR TERM...JRL
SHORT TERM...ETM
LONG TERM...ETM
AVIATION...BSH/ETM
MARINE...BSH/ETM