-- Discussion containing changed information from previous version are highlighted. --
320
FXUS62 KCAE 171943
AFDCAE

Area Forecast Discussion
National Weather Service Columbia SC
343 PM EDT Mon Jun 17 2024

.SYNOPSIS...
-- Changed Discussion --
High pressure, drier conditions, and near normal temperatures
are expected through late this week. Unsettled conditions are
possible by late in the week into the weekend as moisture moves
in from the Atlantic. Well above normal temperatures are
expected by Saturday and Sunday.
-- End Changed Discussion --

&&

.NEAR TERM /THROUGH TONIGHT/...
-- Changed Discussion --
Plenty of low level moisture and stratus this morning has mixed
out and continues to transition into cumulus. Satellite imagery
shows developing cumulus with a few showers in the CSRA. Expect
these to move out in the next hour or two and remain relatively
light. With sunset the cumulus will dissipate with partly cloudy
skies persisting overnight. Some patchy fog is possible near
daybreak however much is expected to be mitigated by the
remaining clouds. High temperatures this afternoon remain on
track for the upper 80s to low 90s with lows tonight in the
upper 60s to around 70.
-- End Changed Discussion --

&&

.SHORT TERM /TUESDAY THROUGH WEDNESDAY NIGHT/...
-- Changed Discussion --
The region will be positioned along the southern periphery of a
strong high pressure ridge centered over New England and the
northern Mid Atlantic Tuesday and Wednesday. At the surface, an
onshore flow off the Atlantic will prevail. Despite the onshore
flow, deep layered moisture will be lacking. Looking at the
forecast soundings very little deep moisture to mention any
isolated shra/tsra. Long range ensemble mean precipitable water
values are around 1 inch on Tuesday and 1-1.25 inches on
Wednesday, well below normal for this time of year. Given the
dry atmosphere and subsidence aloft, expect rain-free conditions
during the short term period. Temperatures will be slightly
moderated some by the cooler onshore flow. Therefore, this
period will likely consist of the coolest temperatures of the
week, with seasonable highs in the upper 80s to around 90.
-- End Changed Discussion --

&&

.LONG TERM /THURSDAY THROUGH MONDAY/...
-- Changed Discussion --
Strong upper level ridging will begin to sink south across the
Mid-Atlantic and Carolinas Wednesday afternoon through Friday.
The upper level ridging will shift west of the area by later
Friday into the weekend. Operational long-range models and to
some extent long-range ensembles suggest an inverted upper
trough retrograding toward the southeast US coast on Friday
beneath the strong ridge. While the signal has been weakening
with recent model runs, there is the potential for a trough or
area of low pressure to develop offshore and move toward the
southeast US coast Friday into Saturday. The latest NHC 7 day
Tropical Weather Outlook indicates a 30% chance of tropical
formation. Despite any potential tropical development, there
does appear to be at least a notable increase in moisture across
the area supportive of unsettled conditions in terms of diurnal
convection on Friday and to a lesser extent on Saturday.


Ensembles then support strengthening ridging at the surface and
aloft over the western Atlantic later Saturday and Sunday.
However, by early next week a weakness develops over the Great
Lakes and a s/w trough will move just north of the area across
the OH Valley and Northeast. This will lead to well above normal
temperatures over the weekend. In fact, the long range ensemble
forecast shows the probability of temperatures reaching or
exceeding 100 degrees to be 25-35% by Sunday. The NWS HeatRisk
also shows Category 3/Red conditions across much of the area on
Sunday, indicating a potential Major Risk of heat- related
impacts.
-- End Changed Discussion --

&&

.AVIATION /18Z MONDAY THROUGH SATURDAY/...
-- Changed Discussion --
VFR conditions expected through the period with low potential
for early morning fog and stratus.

Cumulus and a few showers around AGS/DNL will continue over the
next couple hours. Have included a TEMPO for showers in and
around AGS/DNL through 20z. With sunset cumulus will diminish
with partly cloudy skies overnight. The clouds will suppress fog
development so not mention of fog ATTM. Winds will remain
easterly at 7 knots or less through early tonight then become
light and variable finally returning to easterly around 8 knots
from 15z through the end of the period.

EXTENDED AVIATION OUTLOOK...Moisture and chances of showers and
thunderstorms and associated restrictions return Friday and
Saturday.
-- End Changed Discussion --

&&

.CAE WATCHES/WARNINGS/ADVISORIES...
SC...None.
GA...None.

&&

$$