North Charleston, South Carolina 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

737
FXUS62 KCHS 200138
AFDCHS

Area Forecast Discussion
National Weather Service Charleston SC
938 PM EDT Wed Aug 19 2026

.WHAT HAS CHANGED...
The Aviation section was updated for the 00z TAFs.

&&

.KEY MESSAGES...
- 1) Heat will remain a concern into late week.

- 2) Afternoon and evening thunderstorm coverage will remain
  isolated through Thursday. An increase in thunderstorm
  coverage is expected Friday through the weekend.

&&

.DISCUSSION...
KEY MESSAGE 1: Heat will remain a concern into late week.

Coastal troughing at the surface with ridging aloft will continue
the heat wave into the end of the week. Temperatures are in the mid-
upper 90s this afternoon, with a few more degrees likely before peak
heating ends. Areas along/west of the I-95 corridor will continue to
see a westerly component to the winds this afternoon, which will
advect and mix in some drier air into the environment. This will
result in dew points dropping down into the upper 60s to lower 70s,
keeping heat index values in the 100-107 degree range this
afternoon. Areas along the coast will see a sea-breeze push ashore
this afternoon, keeping dewpoints in the mid to upper 70s which will
result in heat index values of 108-112 deg F this afternoon. While
we may end up on the upper end of guidance today, the previously
issued Heat Advisory looks to be in good shape. Daily highs and
daily high minimums are both possible today, for more see the
climate section below.

Rinse and repeat for Thursday and Friday. Given the continuation of
similar conditions, have issued another Heat Advisory for the
coastal corridor and inland Berkeley county Thursday from 11 AM to 8
PM, where heat index values will peak from 108 to 112 deg F. Friday
looks be a touch cooler given slightly earlier shower/thunderstorm
initiation and more areal coverage, but will likely see similar
coverage of heat prior to showers/storms starting.

An increase in shower and thunderstorm activity this weekend looks
to cool us off enough to possibly go without any heat
advisories/warnings,  though high temperatures look to still peak in
the lower to mid 90s.

KEY MESSAGE 2: Afternoon and evening thunderstorm coverage will
remain isolated through Thursday. An increase in thunderstorm
coverage is expected Friday through the weekend.

Coastal troughing at the surface and ridging aloft will allow for
isolated chances for showers and thunderstorms during the afternoon
and evening hours Thursday. Showers/storms will likely initiate
off of either the coastal trough or the expected sea- breeze,
but as neither will be particularly fast moving, only a few
isolated showers and storms are expected. Models continue to
suggest portions of southeast South Carolina are the primary
region where rainfall is possible, with probabilities in the
20-40% chance range. Similar to the past couple days, while the
environment has 2000-2500 J/kg of CAPE resulting in the
possibility of an isolated strong- severe thunderstorm, the lack
of forcing and the lack of shear and upper level flow has kept
such activity from occurring which should continue today. Expect
a similar repeat of shower and thunderstorm chances for
Thursday.

Friday and into the weekend, a slow moving trough begins to move
across the region, increasing rainfall chances into the weekend.
With temperatures remaining near/above normal, SBCAPE and DCAPE
values could still get quite elevated. Strong to severe
thunderstorms remain possible each afternoon with the main
threat being damaging winds. Heavy rainfall will also be concern
due to the very weak steering winds and elevated PWATs.

&&

.AVIATION /01Z THURSDAY THROUGH MONDAY/...
20/00z TAFs:
KCHS/KJZI/KSAV: VFR through 21/00z.

Extended Aviation Outlook: Isolated afternoon flight
restrictions are possible in showers and thunderstorms on
Thursday. Shower and thunderstorm chances increase Friday into
the weekend, bringing additional chances for brief flight
restrictions.

&&

.MARINE...
There are no large-scale marine concerns. Mornings will generally
start out with south-southwesterly winds, increasing in strength as
they become southeasterly in the afternoon, and back to south-
southwesterly overnight. Seas mostly in the 2-3 ft range. There may
be some isolated showers/storms that move out into the waters today
and Thursday afternoon, with coverage increasing Friday into the
weekend.

&&

.CLIMATE...
Record High Temperatures:

August 19:
KCHS: 98/1983
KCXM: 98/1895
KSAV: 99/1900

August 20:
KCHS: 97/2005
KCXM: 99/1902
KSAV: 102/1900

August 21:
KCHS: 100/1983
KCXM: 99/1900
KSAV: 101/1902

Record High Minimum Temperatures:

August 19:
KCHS: 79/2010
KCXM: 83/2021
KSAV: 79/1878

August 20:
KCHS: 78/2017
KCXM: 82/2017
KSAV: 82/1878

August 21:
KCHS: 79/2010
KCXM: 82/2023
KSAV: 80/1902

August 22:
KCHS: 79/2023
KCXM: 82/2014
KSAV: 79/1902

August 23:
KCHS: 80/2014
KCXM: 81/2019
KSAV: 78/2016

&&

.CHS WATCHES/WARNINGS/ADVISORIES...
GA...Heat Advisory from 11 AM to 8 PM EDT Thursday for GAZ217>219-
     239>241.
SC...Heat Advisory from 11 AM to 8 PM EDT Thursday for SCZ045-
     148>152.
MARINE...None.

&&

$$