987
FXUS62 KCHS 250843
AFDCHS

Area Forecast Discussion
National Weather Service Charleston SC
343 AM EST Mon Nov 25 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 Thursday night. Cold high
pressure will build in late week into the weekend.

&&

.NEAR TERM /THROUGH TONIGHT/...
The forecast area will remain between high pressure centered over
the western Atlantic and an approaching cold front from the west
today. This pattern will provide the region with steady return flow
and rising LLVL thicknesses. The mild LLVL thicknesses combined with
sunny conditions and steady SW winds should result in high
temperatures to range in the low to mid 70s.

Tonight, the cold front is timed to push east of the southern
Appalachians by daybreak Tuesday. Forecast soundings indicate that
high and mid clouds will gradually increase from the west through
tonight. Southwest winds around 5 mph should remain through the
overnight hours. Low temperatures should generally range in the mid
50s. Any rainfall associated with the cold front should remain west
of the forecast before sunrise Tuesday.

&&

.SHORT TERM /TUESDAY THROUGH THURSDAY/...
On Tuesday, an upper shortwave will rotate from the Great Lakes
into southeast Canada while a surface cold front moves through
the local area. There will be little in the way of forcing for
precipitation, though some guidance shows isolated showers ahead
of the front across the Charleston Metro area Tuesday afternoon.
Warm advection ahead of the front will maintain above normal
temperatures.

High pressure will briefly build over the area on Wednesday,
though temperatures will remain above normal. A more prominent
shortwave will cross the Central United States on Thursday,
pushing a cold front into the area late Thursday afternoon.
Strong warm air and moisture advection expected during the day.
In addition to above normal temperatures on Thursday, scattered
showers will spread in from the west later in the afternoon.
Guidance indicates there could be enough instability for
isolated thunderstorms over inland areas as well.

&&

.LONG TERM /THURSDAY NIGHT THROUGH SUNDAY/...
Scattered showers and isolated thunderstorms are expected to
accompany the frontal passage Thursday night. Cool and dry high
pressure will then build over the area. Overnight low
temperatures Friday night through Sunday night expected to dip
below freezing farther inland.

&&

.AVIATION /09Z MONDAY THROUGH FRIDAY/...
VFR at KCHS, KJZI, and KSAV through 06Z Tuesday.

Extended Aviation Outlook: VFR.

&&

.MARINE...
Today and Tonight: The marine zones will remain between high
pressure centered over the western Atlantic and an approaching cold
front from the west. Winds should remain from the west today, speeds
generally around 10 kts. Tonight, winds are forecast to back from
the southwest and increase to 10 to 15 kts. Seas should remain
between 1 to 2 ft. Wave heights may build to 3 ft across portions of
the Charleston County nearshore waters late tonight.

The next chance for advisory conditions will be Thursday ahead
of the strong cold front, particularly the Charleston nearshore
waters where 25 kt gusts look possible. Thursday night and
Friday we could have marginal Small Craft Advisory conditions
over the Charleston nearshore and GA offshore waters.

&&

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

&&

$$

NEAR TERM...NED
SHORT TERM...JRL
LONG TERM...JRL
AVIATION...JRL/NED
MARINE...JRL/NED