Garner, North Carolina 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

975
FXUS62 KRAH 142025
AFDRAH

Area Forecast Discussion
National Weather Service Raleigh NC
425 PM EDT Sat Mar 14 2026

.WHAT HAS CHANGED...
As of 425 PM Saturday...

* There is a Marginal risk (low probability and coverage) for severe
  storms Sunday afternoon through Monday morning

* There is an Enhanced 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 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 425 PM Saturday...

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) Enhanced 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) Tuesday and Wednesday will be much cooler than normal across
central NC, with highs running 1520 degrees below mid-March
averages and lows Tuesday night dropping into the 20s.

&&

.DISCUSSION...
As of 425 PM Saturday...

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

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... Enhanced 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.

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... Tuesday and Wednesday will be much cooler than
normal across central NC, with highs running 1520 degrees below mid-
March averages and lows Tuesday night dropping into the 20s.

Deep mid/upper troughing will set up over the Eastern US on Tuesday
and Wednesday, as Canadian high pressure moves NE from the lower MS
Valley into the Mid-Atlantic behind Monday`s cold frontal passage.
This will result in temperatures that would be below normal for
January, let alone mid-March. Tuesday`s highs will be in the lower-
40s to 50 with blustery WNW winds gusting to 15-20 mph. Under mostly
clear skies and light winds with the surface high moving over or
just north of our region, Tuesday night`s lows will drop into the
lower-to-mid-20s, coolest in outlying spots. Wednesday`s
temperatures will be slightly milder, reaching the mid-40s to lower-
50s, and winds will be lighter. Lows Wednesday night will still drop
into the upper-20s to lower-30s. Conditions will turn milder from
Thursday into at least Saturday as the high moves to the NE and away
from the area.

&&

.AVIATION /18Z SATURDAY THROUGH THURSDAY/...
As of 150 PM Saturday...

24 hour TAF period: High confidence VFR conditions will prevail
through this evening. Northwesterly winds, with some gusts to around
20 kts, will veer around to more sely this aft. High clouds should
move ewd across the area, becoming sct to bkn this aft/eve (highest
coverage north). The biggest uncertainty is timing the development
of MVFR cigs Sun morning. Most, if not all, terminals should be MVFR
by the end of the TAF period. Ely winds may become gusty toward the
end of the TAF period, mainly at the ern terminals.

Outlook: Cigs should lower to IFR and perhaps LIFR Sun eve through
Sun night, with periods of rain/showers possible (highest chances in
the Triad) as low-level moisture increases in a return flow pattern.
Some gusty winds will be possible with showers where they occur. A
strong cold front will bring showers and thunderstorms along with
gusty winds (potentially strong) on Monday, accompanied by the usual
cig/vsby restrictions where storms impact a terminal. Showers and
storms should move out of the area Mon eve/early Mon night, with dry
weather and VFR conditions expected thereafter.

&&

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

&&

$$

DISCUSSION...MWS/JD
AVIATION...10