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675
FXUS62 KGSP 080128
AFDGSP

Area Forecast Discussion
National Weather Service Greenville-Spartanburg SC
928 PM EDT Fri Jun 7 2024

.SYNOPSIS...
Dry high pressure over the area Saturday gives way to a a cold front
and returning shower and thunderstorm chances on Sunday. Forecast
confidence lowers starting next week as the overall pattern is
uncertain by the end of the seven day period, but trends are for a
dry start to the work week then increasing rain chances through
Friday.

&&

.NEAR TERM /THROUGH SATURDAY/...
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Key Messages:

1) Dry Conditions Expected Today

2) Lower Humidity Lingers Through the Period

3) An MCS May Impact the Area Late Saturday but Confidence is Low

As of 930 PM EDT Friday: No major changes for this update as the
weather remains quiet and clear in the CWA.

Dry high pressure will build in from the west into tonight leading
to dry weather, lower humidity, and mostly clear skies. Lows tonight
will be much cooler compared to last night, thanks to great
radiational cooling conditions, and around a few degrees below
climo. Dew point depressions should remain too high for fog
formation overnight.

The sfc high will gradually weaken on Saturday as upper shortwaves
track overhead late Saturday afternoon into Sunday evening. This
will mainly allow for a slight increase in upper cloud cover
Saturday afternoon into Saturday evening. The only caveat is that an
MCS will make a run for the western Carolinas late Saturday
afternoon but it`s expected to gradually weaken as it approaches the
forecast area. CAMs show the potential for some spotty light showers
developing in association with the MCS late Saturday afternoon into
early Sunday evening. However, with confidence too low on whether
activity will be able to hold together, maintained dry conditions on
Saturday for now. Highs temps on Saturday will be a few degrees
warmer across the mountains but similar to today`s highs east of the
mountains.
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&&

.SHORT TERM /SATURDAY NIGHT THROUGH MONDAY/...
As of 150 PM EDT Friday: Short waves carve out a trough from the
northwest flow over the area this period. At the surface a cold
front crosses the area Sunday night with high pressure attempting to
build in from the NW on Monday. The guidance still shows agreement
on showers and scattered thunderstorms for the mountains on Sunday,
with scattered showers and isolated storms elsewhere. Isolated
showers linger Sunday night. Although the latest guidance runs are
trending toward a potentially dry Monday, they have been flip
flopping back and forth between Chance PoP and dry. Have kept low
chance PoP in for Monday in line with the guidance blend, but this
could change should the drier trend continue. Lows will be near to
slightly above normal both nights. Highs will be around 90 along and
south of the I-85 corridor and above normal elsewhere. Highs Monday
drop back to around normal.

&&

.LONG TERM /MONDAY NIGHT THROUGH FRIDAY/...
As of 210 PM EDT Friday: The Monday trough moves east Tuesday as a
short wave ridge builds in. The ridge moves east on Wednesday as a
southern stream low pressure moves into the Gulf Coast and stalls
there while a northern stream short wave traverses the Great Lakes
by Friday. Dry high pressure builds in Tuesday then moves east
Wednesday as a moist southerly flow develops. This flow remains over
the area through Friday as a surface low develops along the Gulf
Coast and stalls while a cold front moves toward the area from the
NW by Friday. This will set up the potential for a protracted period
of at least scattered diurnal convection with the potential for non-
diurnal convection as well. Of course, there is some uncertainty
with the strength and location of these features. Therefore, have
trended toward the guidance blend which keeps scattered mainly
diurnal convection each day. Temps below normal on Tuesday slowly
rise to above normal by Friday.

&&

.AVIATION /02Z SATURDAY THROUGH WEDNESDAY/...
At KCLT and elsewhere: VFR conditions will continue to prevail
across all sites through the end of the TAF period. CIGS are
expected to remain SKC through the night and into Saturday morning
as drier air and high pressure settle into the region. There could
be some upper cirrus clouds Saturday afternoon with SCT250 the
likely CIG. No VSBY issues as no low stratus or FG is expected. The
main element of note for this period is a wind shift. All sites will
prevail N/NW through at least 20z-23z, when winds will back to the
SW once again. During this toggle in direction, wind speeds will be
light.

Outlook: A cold front brings shower and thunderstorm chances back on
Sunday. Activity may linger into early next week due to the front
stalling along the Southeast Coast.

&&

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

&&

$$

SYNOPSIS...RWH
NEAR TERM...AR/CP
SHORT TERM...RWH
LONG TERM...RWH
AVIATION...CP