414
FXUS62 KRAH 031040
AFDRAH

Area Forecast Discussion
National Weather Service Raleigh NC
640 AM EDT Sat Oct 3 2026

.WHAT HAS CHANGED...

* Forecast storm total precipitation amounts through the weekend
  have trended lower, particularly over the Piedmont.

&&

.KEY MESSAGES...
As of 310 AM Saturday...

1) A cold front will move across central NC today bringing showers
and possible thunderstorms to the area.

2) While periods of rain and cold air damming remain likely through
the weekend, mesoscale influences from convection and related MCVs
forecast to develop across the Carolinas through tonight may tend to
suppress heavier, isentropically-driven rain on Sunday.

&&

.DISCUSSION...
As of 310 AM Saturday...

KEY MESSAGE 1...

1) A cold front will move across central NC today bringing showers
and possible thunderstorms to the area.

A cold front just east of the mountains attm will steadily move
south and east today, reaching a position near the SC border and
east toward the NC coast by this evening. Low- and mid-level
moisture transport from the southwest ahead of the front will
interact with this boundary resulting in one or more bands or rounds
of showers and possible tstms which will develop invof the front,
mainly along and south of the Hwy 64 corridor staring this afternoon
and lasting off-and-on through this evening. Tstms chances will be
highest south and east of RDU where fropa will occur later and the
greatest prefrontal instability will be located. It`s possible that
some very localized minor poor drainage flooding could occur where
cells train or brief heavy downpours occur, but that hazard risk
looks fairly limited right now.  Otherwise, some light rain, more
stratiform in nature on the cool stable side of the boundary, is
also possible across our north and northwest zones later today and
tonight, but given its light and patchy nature, will keep PoPs
limited to chance through the daytime hours and slightly higher
overnight as the cooler CAD regime continues to set up along with
ongoing isentropic above the CAD.

So in summary, highest tstm and localized flooding chances today and
this evening across the southern half of central NC, with lighter
amounts farther north and west in the cooler more stable airmass.
It`s worth noting that temps will be highly variable depending on
where you are in relation to the front. High temps today will range
from the lower 70s across the NW Piedmont to mid 80s across our far
SE zones.


KEY MESSAGE 2... While periods of rain and cold air damming remain
likely through the weekend, mesoscale influences from convection and
related MCVs forecast to develop across the Carolinas through
tonight may tend to suppress heavier, isentropically-driven rain on
Sunday.

A positively-tilted trough and plume of deep moisture characterized
by PWs 150-200% normal, evident in GOES-E water vapor satellite data
from the Canadian Maritimes to Baja CA, will translate sewd and
across the Southeast through early Mon. A series of convectively-
amplified mid-level disturbances from the Gulf to the Carolinas will
track through the prevailing swly mid-level flow along and ahead of
the trough. One such feature now over sern GA, and others that may
develop in-situ within frontal convection forecast to develop across
the Carolinas through tonight, will likely be in the process of
exiting cntl NC by Sun morning, per an increasing signal of such in
model guidance this morning. Following subsidence and veering of the
flow to swly or even wly/nwly for a time, trailing the related
low/mid-level vorticity maxima, will likely weaken what would
otherwise be a favorable synoptic pattern of isentropic ascent over
cntl NC on Sun. Another, probably larger disturbance originating
from larger clusters of deep convection over the Gulf, will
meanwhile track across the Gulf Coast and Southeast through Sun
night. While this feature will likely enhance ascent and
precipitation along its track, there are indications that a
progressive nrn stream trough forecast to pivot across James Bay and
surrounding ern Canada and Great Lakes will limit the nwwd extent of
its related precipitation shield and possibly confine it to the srn
and sern portions of NC later Sun through Sun night.

At the surface, a wavy synoptic front and slightly preceding outflow
boundary, now progressing swd across srn and cntl VA, will settle
ssewd across cntl NC today, then become quasi-stationary across SC
and southeastern NC later tonight and Sun. A following, ~1026-1028
mb cP high now over the Great Lakes will progress across and
offshore sern Canada through the weekend, while extending swd across
the Middle Atlantic and Carolinas. Though progressive, the high will
be favorably strong and located for cold air damming to develop over
the srn Middle Atlantic and Carolinas.

Given the mesoscale and subsequent nrn stream influences noted
above, precipitation amounts have trended lower across model
guidance in the past 24 hours for cntl NC, particularly over the
Piedmont. While they may yet change further given remaining
uncertainties on the mesoscale, there is greater confidence that
precipitation amounts over the nw Piedmont, where the ongoing drought
has become extreme to exceptional, may struggle to reach 0.50-0.75".
Amounts in adjacent portions of the Piedmont may be similarly
reduced if not impacted by convective, frontal precipitation prior
to Sun. Meanwhile to the south and across the Sandhills and srn-cntl
Coastal Plain, 1-2" amounts, with locally higher ones to 3-4",
appear likely given an overlap in those areas of convective, frontal
precipitation through tonight and steadier/heavier stratiform rain
along the track of the disturbance(s) forecast to emerge from the
Gulf and track across the Southeast later Sun-Sun night.

&&

.AVIATION /12Z SATURDAY THROUGH WEDNESDAY/...
As of 640 AM Saturday...

Through 12Z Sunday:  Satellite and obs show VFR conditions currently
across most of central NC, but as the late-morning progresses, we`ll
see VFR deteriorating to MVFR from SW to NE as initial light to
moderate rain showers develop and/or move in. After 16Z, scattered
to numerous showers and embedded tstms will result in local IFR/LIFR
ceilings and MVFR/IFR visibilities, with heavy downpours temporarily
dropping VIS to 1SM or lower, especially at FAY/RWI/RDU where
instability will be greatest with highest chance for tstms with
brief heavy downpours. Winds becoming NE 8-12 kt with gusts to 18 kt
behind the front. For this evening, the front will be mainly to our
south with patchy light rain remaining possible, eventually becoming
more drizzle in nature, but with LIFR/IFR ceilings and low stratus
remaining in place through Sunday morning across all central NC TAF
sites.

Outlook: Widespread adverse aviation conditions due to low cigs/vsby
will continue across the area into early Monday. A drier air mass
will build into the region midday Monday, followed by a return to
VFR conditions by late Monday the lasting through mid week.

&&

.RAH WATCHES/WARNINGS/ADVISORIES...
None.

&&

$$

DISCUSSION...np/MWS
AVIATION...np