North Charleston, South Carolina 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

484
FXUS62 KCHS 301050
AFDCHS

Area Forecast Discussion
National Weather Service Charleston SC
650 AM EDT Thu Jul 30 2026

.WHAT HAS CHANGED...
All sections have been updated.

&&

.KEY MESSAGES...
- 1) Hot and humid conditions are expected to persist along
  portions of the coast today. Heat index values will be most
  elevated along the southeast Georgia coast and a Heat Advisory
  is in effect for McIntosh County.

- 2) Isolated to scattered thunderstorms are expected to
  develop along the southeast Georgia coast this afternoon. A
  couple of strong to severe storms will be possible into the
  evening hours, especially further south near the Altamaha
  River.

&&

.DISCUSSION...
KEY MESSAGE 1: Hot and humid conditions are expected to persist
along portions of the coast today. Heat index values will be
most elevated along the southeast Georgia coast and a Heat
Advisory is in effect for McIntosh County.

A noticeable airmass change will take place today for much of
southeast Georgia and southeast South Carolina. In fact,
precipitable water values are progged to drop to near one inch
across far inland areas including Allendale, inland Colleton,
inland Dorchester, and northern Berkeley counties. However,
further south along the southeast Georgia coast dewpoints will
remain elevated in the mid to upper 70s. The portion of the
coast from Beaufort County south will see persistent heat index
values around 105, with up to 110 down near the Altamaha.
Therefore, a Heat Advisory is in effect for McIntosh County.

KEY MESSAGE 2: Isolated to scattered thunderstorms are expected
to develop along the southeast Georgia coast this afternoon. A
couple of strong to severe storms will be possible into the
evening hours, especially further south near the Altamaha River.

A boundary, primarily of the moisture variety, will continue to
sit across the forecast area today. The boundary will generally
run along and south of I-16 through the Savannah River
entrance. North of the boundary, dewpoints will fall into the
low to mid 60s while south of the boundary there should be
enough moisture pooling along the Georgia coast to support
isolated to scattered convective development. The near storm
environment will be similar to Wednesday with plenty of DCAPE
(>1,000 J/kg) and 25-30 knots of mid-level flow. This should be
sufficient to create a low end risk of a strong to severe storm
along the Georgia coast, with the main threat being damaging
wind gusts. A small portion of the southeast Georgia coast
remains in the Marginal Risk area of SPC`s Day 1 Severe Weather
Outlook. Storm activity shouldn`t linger too long into the
evening, and storm motion should push storms out into the
coastal waters where a few strong gusts will be possible.

&&

.AVIATION /12Z THURSDAY THROUGH MONDAY/...
The 12z TAF period begins with VFR conditions at KCHS, KJZI,
and KSAV. VFR conditions will then generally prevail through the
entire TAF period. The only real forecast issue will once again
be the potential for thunderstorms near KSAV this afternoon.
Current thinking is that most of the thunderstorm activity will
be to the east along the coast or to the south near the
Altamaha. Therefore, we will not mention any thunder in the TAF
for now.

Extended Aviation Outlook: Primarily VFR. Less thunderstorm
coverage is expected through Friday before coverage increases
this over the weekend.

&&

.MARINE...
Today and Tonight: A weak stationary front will linger in the
vicinity of the marine waters today. Variable winds are expected
this morning, generally around 10 knots. Winds will shift to
the SW late this afternoon into tonight. Seas will average 2 to
3 ft.

Friday through Tuesday: The aforementioned stationary front
will linger into the start of weekend before a stronger front
moves through late this weekend. Wind gusts could approach 25
knots across the waters on Sunday, associated with the front.
Small Craft Advisories could be required late Sunday into
Monday.

&&

.CLIMATE...
Record High Minimum Temperatures:

August 1:
KCHS: 81/1999
KCXM: 86/1999
KSAV: 79/2020

August 2:
KCHS: 79/2022
KCXM: 84/1999
KSAV: 80/1886

&&

.CHS WATCHES/WARNINGS/ADVISORIES...
GA...Heat Advisory from 11 AM this morning to 7 PM EDT this evening
     for GAZ240-241.
SC...None.
MARINE...None.

&&

$$

BSH/CPM