186
FXUS62 KCHS 242308
AFDCHS

Area Forecast Discussion
National Weather Service Charleston SC
608 PM EST Sun Nov 24 2024

.SYNOPSIS...
High pressure will remain the primary feature through Monday
night. A cold front will move through Tuesday night, then a
stronger cold front will move through late week.

&&

.NEAR TERM /THROUGH MONDAY/...
Surface high pressure will remain more or less overhead through
tonight. Lots of clear skies anticipated, and with surface winds
that have already decoupled in most places, good radiational
cooling conditions will once again occur. However, starting
from warmer temps (~5F) and slightly higher dewpoints, low
temperatures will not be as chilly tonight; the upper 30s/lower
40s inland and mid 40s/low 50s closer to the coastline. A touch
of frost is not completely out of the question at the coldest
locations, but no headline is planned. Maybe some steam fog in
marshy areas, near rivers, and ponds during the overnight
period.

&&

.SHORT TERM /MONDAY NIGHT THROUGH WEDNESDAY/...
Southwesterly flow will prevail aloft on Monday with a mid-level
trough placed just west of the Great Lakes. At the surface high
pressure will begin to push off the southeastern coast as a cold
front approaches from the west. The trough aloft will continue to
push eastward Tuesday, exiting off the New England coast on
Wednesday. The surface cold front will push through the forecast
area Tuesday night. The forecast remains rain-free as moisture looks
rather limited ahead of the front. Little change in airmass is
expected with FROPA, with highs in the low to mid 70s each day.
Overnight lows will be a few degrees above normal, generally in the
upper 40s inland and mid to upper 50s along the coast.

&&

.LONG TERM /WEDNESDAY NIGHT THROUGH SUNDAY/...
A large mid-level low pressure will be present just to the north of
New England. Wednesday night into Thursday a short wave trough will
ripple across the southern periphery of the larger scale low
pressure, generally in the vicinity of the Mid-Atlantic states. At
the surface high pressure will briefly build into the region before
a strong cold front pushes through Thursday night. Isolated to
scattered showers are possible Thursday into Thursday night. The
main forecast highlight with FROPA will be the chilly airmass on the
backside of the front. Low temperatures Friday night could drop
near/below freezing away from the coastline. Chilly temperatures
will persist into the weekend.

&&

.AVIATION /23Z SUNDAY THROUGH FRIDAY/...
VFR at KCHS, KJZI, and KSAV through 00Z Tuesday.

Extended Aviation Outlook: VFR.

&&

.MARINE...
Tonight: Despite weak warm advection across the coastal waters,
SW winds will reach as high as 15 kt and gusty early on. Then
as land breeze influences develop and the pressure gradient
slackens, winds turn more W and drop to mainly 10 kt or less
overnight. Seas no higher than 1 or 2 feet throughout.

Monday through Friday: A weak cold front is forecast to push
through the region Tuesday/Tuesday night, with a stronger cold
front pushing through Thursday/Thursday night. SW winds
generally around 10 knots with seas 1 to 2 feet are forecast
through the middle of the week. A slight surge in winds is
expected after FROPA on Tuesday with winds increasing to 10 to
15 knots with a few gusts to 20 knots. An additional surge in
winds is expected with the stronger cold front Thursday, with
winds 15 to 20 knots with gusts around 25 knots and seas
building to 3 to 4 ft. Small Craft Advisories may be required
for all marine zones late in the week.

&&

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

&&

$$

NEAR TERM...Adam
SHORT TERM...CPM
LONG TERM...CPM
AVIATION...
MARINE...Haines