North Charleston, South Carolina 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

806
FXUS62 KCHS 182324
AFDCHS

Area Forecast Discussion
National Weather Service Charleston SC
724 PM EDT Wed Mar 18 2026

.WHAT HAS CHANGED...
The Aviation section has been updated for the 00Z TAF issuance.

&&

.KEY MESSAGES...
- 1) Frost is expected to develop overnight into Thursday,
  impacting sensitive vegetation.

- 2) Rain-free conditions and warming temperatures into
  the weekend.

&&

.DISCUSSION...
KEY MESSAGE 1: Frost is expected to develop overnight into
Thursday, impacting sensitive vegetation.

Out ahead an approaching surface ridge axis, another overnight
period with low temperatures in the 30s is expected. This is due to
weak cold-air advection at first, which then transitions over to
radiational cooling as winds weaken and the boundary layer
decouples. Widespread temperatures in the mid 30s are thus expected
away from the coast and when combined with the weak winds, areas of
frost are expected to form across the region prompting a Frost
Advisory for inland zones. Those along the coast have been kept out
of the Frost Advisory given the expected overnight lows in the upper
30s to lower 40s.

KEY MESSAGE 2: Rain-free conditions and warming temperatures
into the weekend.

The southeastern states will remain under the influence of broad
troughing along the Eastern Seaboard until the end of the week when
the troughing pushes into the Atlantic waters. Then, through the
weekend, ridging will build into the region aloft from the
southwest. At the surface high pressure will dominate, centered over
the southeastern states. This synoptic pattern will yield quiet
weather with gradually warming temperatures into the weekend. High
temperatures Thursday in the 60s will warm to the low to mid 80s by
Sunday. The next chance of rain across the region will be Monday as
a weak cold front advances towards the region.

&&

.AVIATION /00Z THURSDAY THROUGH MONDAY/...
00Z Thursday: Prevailing VFR at KCHS, KJZI, and KSAV.

Extended Aviation Outlook: VFR conditions are expected to
prevail.

&&

.MARINE...
Tonight through Sunday: Overall, wind and sea conditions are
expected to remain below Small Craft Advisory thresholds through
Saturday. The exception for this in the near-term are the outer
Georgia waters, where wind gusts of 25 to 30 knots are possible
as the surface pressure gradient tightens tonight into
Thursday. In addition to the winds, 6-7 foot seas are expected
to form and linger in the outer Georgia waters, subsiding below
SCA criteria overnight into Friday morning.

A dissipating front may briefly bring winds back up to near 20 knots
Saturday morning, with winds picking up on Sunday ahead of an
approaching cold front, bringing the next chance for a Small Craft
Advisory. NBM 5.0 probabilities for wind gusts greater than 25 knots
are currently in the 40-60% range for the nearshore waters, closer
to 70% in the outer Georgia waters though the southern extent
remains unclear.

&&

.EQUIPMENT...
Radome panel replacement maintenance has started at the KCLX
radar and is scheduled to continue through Friday March 20th.
The radar will be down during this time. Users are encouraged to
use data from the following nearby radar sites during the
maintenance outage:

KCAE - Columbia, SC
KLTX - Wilmington, NC
KJAX - Jacksonville, FL
KVAX - Moody AFB, GA
KJGX - Robbins AFB, GA

&&

.CHS WATCHES/WARNINGS/ADVISORIES...
GA...Frost Advisory from midnight tonight to 9 AM EDT Thursday for
     GAZ087-088-099>101-114>116-137-138.
SC...Frost Advisory from midnight tonight to 9 AM EDT Thursday for
     SCZ040-042>045-047.
MARINE...Small Craft Advisory until 5 AM EDT Friday for AMZ374.

&&

$$

BRS