Hanahan, South Carolina 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

163
FXUS62 KCHS 112231
AFDCHS

Area Forecast Discussion
National Weather Service Charleston SC
631 PM EDT Mon Aug 11 2025

.SYNOPSIS...
A hot and humid air mass will build over the region through
mid-week, then will likely linger through this weekend.

&&

.NEAR TERM /UNTIL 6 AM TUESDAY MORNING/...
Early this evening: We seem to be starting to feel the impact of
the ridge aloft nosing in from the east as the coverage of
showers and isolated thunderstorms has diminished significantly
across the coastal waters and along the coast. There are still
clusters of showers impacting interior southeast GA, but this
activity should lift into central GA and the SC Midlands over
the next couple of hours. Overnight, there is good model
agreement that we should see considerably less activity. There
could be isolated to scattered showers over the coastal waters
that attempt to push onshore, but nothing like what we have seen
the past few nights. Due to the very low risk of additional
rainfall, we have allowed the remaining Flood Watch to expire.

&&

.SHORT TERM /6 AM TUESDAY MORNING THROUGH THURSDAY/...
Tuesday, the forecast area will remain between high pressure
over the western Atlantic a broad low pressure over the lower
Mississippi River Valley. This pattern should support steady SSE
winds across the CWA. High resolution guidance indicates that
as temperatures reach the upper 80s to low 90s across the
region, a sea breeze will develop during the early afternoon
hours. Forecast soundings indicate that CAPE is forecast to
range from 1500-2000 J/kg. Scattered to numerous showers and
thunderstorms may develop along the sea breeze, tracking inland
between 10 to 20 mph. Given dewpoints in the mid to upper 70s,
heat index values should peak between 100-106 degrees.

Wednesday and Thursday, the center of a 595 dm ridge will build
over FL and the eastern Gulf. High temperatures are forecast
range in the low to mid 90s. Forecast soundings indicate a weak
subsidence inversion around H7 should be overcome during the
heat of the afternoon, yielding scattered convection along the
sea breeze. In addition, heat index around 105 degrees should be
common each afternoon. It is possible that conditions could
reach Heat Advisory levels across coastal GA both days.

&&

.LONG TERM /THURSDAY NIGHT THROUGH MONDAY/...
Friday into early next week, H5 ridge will shift over the Deep
South. GFS indicates that a shortwave could ripple across
forecast area early next week. This pattern should yield a
typical summer-time pattern with afternoon thunderstorms and
hot and humid conditions. Heat index values may peak at or near
Heat Advisory criteria across coastal GA and the lower SC coast
on Friday.

&&

.AVIATION /00Z TUESDAY THROUGH SATURDAY/...
The 00z TAF period begins with VFR conditions and no shower
activity near KCHS, KJZI, and KSAV. Overall, VFR conditions
should prevail through the night and the remainder of the TAF
period. While there could be an occasional shower pushing
onshore overnight, we aren`t anticipating anything like what we
have seen the past few nights. For the afternoon, there could be
isolated to scattered showers and storms that develop along the
sea breeze in the early afternoon, but this activity should move
quickly inland and any threat to the terminals will be short-
lived.

Extended Aviation Forecast: Brief flight restrictions will be
possible due to afternoon showers/thunderstorms.

&&

.MARINE...
Through Tonight: No concerns. East/southeast winds 15 kt or
less will prevail with seas 2-4 ft.

Tuesday through Saturday: The pattern should generally support
south winds between 10 to 15 kts with seas between 2 to 3 ft.

&&

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

&&

$$

NEAR TERM...BSH
SHORT TERM...NED
LONG TERM...NED
AVIATION...BSH/NED
MARINE...NED/SST