Winston-Salem, North Carolina 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

058
FXUS62 KRAH 151020
AFDRAH

Area Forecast Discussion
National Weather Service Raleigh NC
620 AM EDT Sun Mar 15 2026

.WHAT HAS CHANGED...
As of 256 AM Sunday...

* The severe risk on Monday has been upgraded to a Moderate Risk
  (higher coverage than usual and with isolated instances of
  significant severe, eg. EF2 or stronger tornado and 75 mph or
  greater gusts), with timing of greatest risk between 10A-7P.
  Residents should act this weekend to implement their severe
  weather preparedness plans and ensure means to receive severe
  weather alerts. More info at www.weather.gov/rah/severeprep

&&

.KEY MESSAGES...
As of 256 AM Sunday...

1) Marginal risk (low probability and coverage) for shallow,
rotating cells capable of an isolated spin-up/tornado or strong to
locally damaging wind gust Sunday afternoon through Monday morning

2) Moderate Risk for severe storms Monday (higher coverage than
usual and with isolated instances of significant severe, eg. EF2 or
stronger tornado and 75 mph or greater gusts), with potential for
mixed mode (discrete or semi-discrete supercells with all hazards
ahead of a QLCS with widespread strong to locally damaging wind
gusts and corridors of significant wind and/or mesovortex tornadoes)
and with timing of greatest risk between 10A-7P.

3) Cooler than normal temperatures expected early Tuesday through
Wednesday night across central NC, with highs running 1520 degrees
below mid-March averages.

&&

.DISCUSSION...
As of 256 AM Sunday...

KEY MESSAGE 1... Marginal risk (low probability and coverage) for
shallow, rotating cells capable of an isolated spin-up/tornado or
strong to locally damaging wind gust Sunday afternoon through Monday
morning

Sunday Morning Update: Sfc analysis this morning depicted a warm
front draped across the northern/western Piedmont.  Further south,
regional mosaic radar indicated a developing area of convection off
the Florida/GA coastline embedded within a plume of higher PWAT and
low-level moisture transport. With time, this plume of richer
moisture will advect across central NC this afternoon and evening.
Latest guidance continues to highlight associated showers and
possibly a few storms moving into the southern Piedmont/Sandhills
this afternoon/evening before moving north and decaying later
tonight. The low-end threat for mini supercells and associated
isolated wind/tornado threat detailed  below in the previous
discussion remains valid given latest trends in observations and
model guidance.

Previous discussion:

A couple of shortwave troughs now over the nrn Great Basin/nrn
Rockies and cntl AB/SK, respectively, will become increasingly-
phased as they amplify a synoptic trough sharply across the Plains
and MS Valley Sun-Sun night. Standardized 500 mb height anomalies
within the trough are forecast to be negative 4-5 sigma over the
lwr/mid MS Valley by 12Z Mon. Preceding height falls and
strengthening lwr/mid-tropospheric flow will result downstream of
the trough and throughout much of the ern US, including into cntl NC
late Sun and particularly Sun night.

At the surface, a ~1022 mb high now over ern NC will be overtaken by
a stronger one that will strengthen from ~1025 mb over the Great
Lakes this afternoon to 1030-1035 mb off the New England and nrn
Middle Atlantic coast through early Sun, while extending swwd across
the srn Middle Atlantic Piedmont. A warm front will strengthen on
the periphery of the ridge and retreat nwwd across cntl NC, where
ely/sely and onshore flow will favor modification of the antecedent
continental/dry airmass and with surface dewpoint recovery into the
50s F Sun afternoon. Richer, more-maritime low-level moisture, along
a separate frontal zone now extending across the ern Gulf and cntl
FL peninsula, will be transported nwd and across the srn Middle
Atlantic Piedmont and Coastal Plain Sun night-Mon morning, in
response to the aforementioned strengthening wind fields/low-level
jet.

Given the only modest low-level moisture recovery coincident with
afternoon heating, instability will remain weak and confined
primarily to the srn Piedmont and Sandhills; and point forecast
soundings to varying degrees depict a warm/dry layer based around
700-800 mb. As such, any cells that develop in that environment,
probably invof the warm front, will be shallow but modestly sheared
amid veering wind profiles in that layer, with an associated
conditional risk of at least transient mini-supercells capable of
strong to locally damaging gusts and/or an isolated spin-up/tornado.
The latter risk would be more likely toward evening, as LCLs lower
with nocturnal cooling, and strengthening low-level wind fields
yield stronger SRH. As cells progress nwwd across the nrn Piedmont
through evening, they should become increasingly elevated and/or
weaken, through associated rain may briefly diabatically-strengthen/
reinforce the (wedge) front as it slows over w-cntl NC/VA.

A couple of additional, low probability/risks of severe will exist
through Mon morning from 1) scattered cells moving onshore over
sern/ern NC and into the vicinity of RAH`s srn-cntl Coastal Plain and
2) with a risk of other scattered cells more-broadly throughout cntl
NC, amid warm/moist advection and beneath the strengthening height
falls aloft. Each regime would pose a risk of isolated tornadoes and
strong to locally damaging gusts.


KEY MESSAGE 2... Moderate Risk for severe storms Monday (higher
coverage than usual and with isolated instances of significant
severe, eg. EF2 or stronger tornado and 75 mph or greater gusts),
with potential for mixed mode (discrete or semi-discrete supercells
with all hazards ahead of a QLCS with widespread strong to locally
damaging wind gusts and corridors of significant wind and/or
mesovortex tornadoes) and with timing of greatest risk between 10A-
7P.

Sunday Morning Update: Little change in thinking with this forecast
package with pretty steady model progs over last several days. Given
the expected extreme shear profiles, SPC has introduced a Moderate
Risk driven primarily by a 60% SIG WIND, although strong tornadoes
and large hail will certainly be possible as well. The detailed
previous discussion below including potential severe hazards and
timing remain valid at this juncture.

Previous Discussion:

An intense synoptic trough will pivot and lift across the TN/OH
Valleys and Appalachians and Middle Atlantic Mon-Mon night. Strong,
50-150 meter mid-level height falls will result across cntl NC
(strongest nw) through Mon evening, during which time mid-level flow
will increase to around 100 kts in the right entrance region of an
intense (~125 kt), 500 mb speed max.

At the surface, a QLCS will likely to be ongoing at 12Z Mon near the
spine of the Appalachians, along or probably slightly preceding a
strong, polar front. An effective cold front will likely result from
the QLCS; and this boundary will probably serve as the wrn bound of
severe risk, with weaker convection possible along the synoptic,
polar/cold front during the evening. Timing of the QLCS will be most
favorable for strongest diurnal heating from the ern Piedmont ewd,
and especially in the Coastal Plain (I-95 corridor). Widespread,
strong to locally damaging wind gusts will probably result along the
length of the QLCS, with corridors of 55-75 mph and locally >75 mph
in embedded bowing segments and/or mesovortices. The latter will
also favor the development of isolated tornadoes, a couple of which
could be strong. There is a lower predictability for discrete or
semi-discrete supercells ahead of the QLCS and effective and
synoptic cold fronts, also favored over the Coastal Plain of NC/VA.
Should some occur, they would pose a risk of all hazards, including
large hail and also a risk of a strong tornado or two.

It will turn sharply colder behind the polar front Mon evening-
night, with CAA-driven lows in the upr 20s-mid 30s.


KEY MESSAGE 3... Cooler than normal temperatures expected early
Tuesday through Wednesday night across central NC, with highs
running 1520 degrees below mid-March averages.

In the wake of Mondays cold front, cooler and drier air will filter
into central North Carolina late Monday night into Tuesday. A broad
upper-level trough settling over the eastern US will reinforce cold
air advection through the day Tuesday, keeping temperatures below
mid-March climatology.

High temperatures are expected to reach the mid 40s to near 50
across the region Tuesday, which is roughly 15-20 degrees below
normal for this time of year. Breezy west to northwest winds may
also persist through much of the day Tuesday, with early morning
wind chills in the 20s. Tuesday night lows will be in the mid to
upper 20s with some cooler spots in NW the low 20s.

&&

.AVIATION /12Z SUNDAY THROUGH THURSDAY/...
As of 620 AM Sunday...

VFR conditions continue through at least 15Z with some mid to high
clouds entering the region across the region. Conditions deteriorate
mid-day as southerly flow increases moisture ahead of the
approaching system. Low-to-medium confidence on exact timing of
initial precipitation; expect isolated to scattered storms between
15Z18Z. TEMPO groups were added to all terminal sites to account
for the intermittent activity. Ceilings trend to MVFR from west to
east between 18Z21Z, with medium confidence in for IFR/LIFR
conditions after 00Z Monday. Surface visibilities will degrade as
the boundary layer saturates, with BR/FG likely reducing
visibilities from 1/2 to 1 1/2 miles at most sites late Sunday
night. A potent 4050 kt LLJ at 2,000 ft will override a stable
surface layer with light winds. Therefore medium to high confidence
for LLWS at all terminals starting around 00Z Monday continuing
through Monday morning. LIFR/IFR persists through the morning with
widespread SHRA/TSRA. LLWS remains a primary concern until frontal
passage late Monday night. Winds will shift SW and become gusty (30+
kts) ahead of a line of storms.

Outlook: Monday:  Rapid improvement to VFR after 00Z/Tues as the
front clears the region.
Tuesday-Wednesday: High confidence VFR. Strong high pressure builds
in, bringing clear skies and drier air. Blustery WNW winds on
Tuesday (1520 kts) will diminish by Wednesday.
Thursday: Continued VFR. High pressure shifts offshore with winds
veering southerly. Increasing high clouds, but no category
restrictions expected through  Thursday.

&&

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

&&

$$

DISCUSSION...Luchetti/MWS/CA
AVIATION...CA