-- Discussion containing changed information from previous version are highlighted. --
650
FXUS62 KGSP 101352
AFDGSP

Area Forecast Discussion
National Weather Service Greenville-Spartanburg SC
952 AM EDT Mon Jun 10 2024

.SYNOPSIS...
A cold front moves south of the CFWA becoming stationary through mid
week with dry conditions under weak high pressure for Monday through
Thursday. Isolated to widely scattered showers and thunderstorms are
expected by next weekend as a weak cold front approaches from the
north. Temperatures are expected to be well above normal at end of
the week.

&&

.NEAR TERM /THROUGH TONIGHT/...
-- Changed Discussion --
As of 945 am Monday: Radar continues to show the slow progression of
showers sagging toward the south along a weak frontal boundary.
Slightly drier air behind it is reducing moisture for any new rain
development. Satellite also shows clearing skies behind the front as
well. Adjusted PoPs down (15-45%) toward the far southern counties,
which will taper off to non-mentionable PoP (<15%) by this
afternoon.

A series of short waves will carve out a long wave trough across the
East through the period. The leading edge of an attendant, quasi-
stationary frontal zone is located just south of the forecast area.
The upper trough is expected to deepen enough to send the frontal
boundary comfortably southeast of the area by afternoon, bringing
clearing skies and an end to shower chances for much of the area,
although some isolated terrain-induced diurnal showers are possible.
Falling heights will result in max temps about a category below
climo. Under rather good radiational cooling conditions and dry air,
min temps tonight will be around 5 degrees below normal.
-- End Changed Discussion --

&&

.SHORT TERM /TUESDAY THROUGH WEDNESDAY NIGHT/...
As of 200 AM EDT Monday: Frontal boundary will be located well south
of the CFWA by the beginning portions of the short term as a weak
continental surface high builds in from the northwest. Lingering
cyclonic flow aloft will gradually shift eastward Tuesday into
Tuesday night as a shortwave rounds the base of the upper trough
and pushes the trough axis offshore by Tuesday night. Temperatures
on Tuesday will likely be the lowest from D2-D7 as lower thicknesses
remain in place overhead with near-normal values. Height rises will
work back into the region for Wednesday in response to the exiting
trough axis, which will help to moderate the airmass and allow
afternoon highs for Wednesday to uptick a category or so to slightly
above normal values across the CFWA. Model guidance generally agree
with shifting the surface high just offshore the Mid-Atlantic and
Carolina Coast Wednesday night to bring in a light Atlantic fetch,
which could initiate a shower or thunderstorm along the favorable
facing slopes on the eastern Blue Ridge Escarpment. Only shallow
low-level moisture and weak forcing keeps forecast confidence low
and will maintain non-mentionable PoPs for now until the CAMs pick
up on this development over the next 12-24 hours. Otherwise, the
sensible weather will be mostly dry with temperatures rebounding
by midweek.

&&

.LONG TERM /THURSDAY THROUGH SUNDAY/...
As of 320 AM EDT Monday: Run to run consistency beginning to get
better compared to the previous few forecast updates. Sensible
weather remains dry through Thursday before diurnal convection
enters back into the forecast by Friday as a weak backdoor
front slips into the area. At the same time, the airmass will
continue to get warmer as an upper anti-cyclone deepens over the
central CONUS and shifts over the eastern CONUS by the end of the
upcoming weekend. Very warm thicknesses (590+ dm) will likely
cause temperatures to rise well above average with some of the
guidance indicating afternoon highs in the low to mid 90s east of
the mountains by D6/D7. Surface low that develops over the Gulf
will struggle to shift this far north without a clear steering
flow as it meanders over the eastern Gulf with a semblance of a
Rex Block forming over the southeastern CONUS. A warming trend
will continue through the extended forecast period with highs ~10
degrees above normal for both highs and lows by Saturday and Sunday.

&&

.AVIATION /14Z MONDAY THROUGH FRIDAY/...
At KCLT and elsewhere: Scattered, mainly light SHRA from KAND to
KGSP will move southeast of the terminals by late morning. Brief
MVFR cigs remain possible around KAND for the first couple of hours
of the period or so. Otherwise, VFR is forecast through the period.
Mid/high level cloud cover is expected to steadily clear from the
northwest through the morning, with mostly SKC conditions expected
at all terminals by early afternoon. This could be followed by VFR
stratocu development this evening, but that`s open to debate at this
point. Light winds with a northerly component are anticipated
through much of the period, except for a brief excursion to light SW
this afternoon.

Outlook: Dry sfc high pressure will become established this
afternoon, and generally remain through the end of the work week,
with little chance for convection or restrictions.

&&

.GSP WATCHES/WARNINGS/ADVISORIES...
GA...None.
NC...None.
SC...None.

&&

$$

SYNOPSIS...CAC
NEAR TERM...CP/JDL
SHORT TERM...CAC
LONG TERM...CAC
AVIATION...JDL