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755
FXUS62 KMHX 241906
AFDMHX

Area Forecast Discussion
National Weather Service Newport/Morehead City NC
306 PM EDT Fri May 24 2024

.SYNOPSIS...
A surface trough will reside across the piedmont while a series
of upper level shortwaves will generate multiple rounds of
shower and thunderstorm activity through the weekend. A stronger
cold front will move through early next week.

&&

.NEAR TERM /THROUGH TONIGHT/...
-- Changed Discussion --
As of 3 PM Fri...Latest analysis shows weak low pressure over
the Delmarva with sfc trough extending through the NC coastal
plain this afternoon. Boundary will continue to push eastward
into the area tonight as another weak low develops along it,
coupled with diurnal heating and the seabreeze providing lift
and focus for tstm development.

Strong to severe thunderstorms possible through late this
evening. The main hazards of concern are heavy rainfall, strong
winds, large hail and frequent lightning. Scattered showers and
storms beginning to blossom along and south of Hwy 70 this
afternoon, along differential heating boundaries where skies
have cleared from early convection. Environment will remain
favorable for convection with mesoanalysis showing SB CAPEs
2-3000 J/kg, bulk shear 30-35 kt and modest mid level lapse
rates. High PWATs (around 1.75") and potential for training
cells will pose a threat for locally heavy rainfall. Convection
will begin to wane with loss of heating this evening, grad
pushing off the coast late. Other forecast challenge overnight
is the fog and/or stratus potential. Most guidance continues to
show fog and low stratus spreading from NE to SW overnight as
weak boundary moves in and low level flow becomes light N/NEly.
Patchy dense fog will be possible, though confidence is low at
this time.
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&&

.SHORT TERM /SATURDAY/...
-- Changed Discussion --
As of 3 PM Fri...Weak boundary/trough and low pressure will grad
shift off the coast through the day. Main change to previous
forecast was to lower pops more towards climo, with most of the
12z CAMs coming in much drier. Environment will still be
supportive of diurnal convection with SB CAPEs up to 1500 J/kg,
though shear will be the limiting factor, bulk shear 10-20 kt.
Still expecting scattered diurnal convection to develop with
best chances likely focused along the seabreeze. With weak
boundary and low pressure over the area, light onshore winds may
support low clouds and patchy fog lingering along the Outer
Banks through much of the day. Highs in the mid/upper 70s for
the beaches and mid/upper 80s inland.
-- End Changed Discussion --

&&

.LONG TERM /SATURDAY NIGHT THROUGH FRIDAY/...
As of 230 AM Friday...

 - Periods of thunderstorms through Tuesday

 - Above to well above normal temps Sunday and Monday

 - Trending drier and not as hot mid to late-week

An anomalous mid/upper level ridge will extend west to east from
Mexico to Florida through the middle of next week, with a mostly
zonal flow aloft to the north across the southern US. Within this
flow, several shortwaves originating over the Plains will traverse
the Carolinas, interacting with a moist and unstable airmass,
producing periods of showers and thunderstorms. In this type of
setup, thunderstorms are possible just about anytime of day or
night, and will be highly dependent on the track and timing of each
wave that moves through, as well as any impact from the previous
day`s convection. Each day, guidance suggests MLCAPE as high as 1000-
2000j/kg, with deep layer shear of 25-35kt. This shear/instability
combination is at least marginally conducive to severe weather, and
this is something we`ll have to keep an eye on each day. At the
moment, it appears that Sunday and Monday may carry the best
potential for a risk of strong to severe thunderstorms (thanks to
the potential for higher instability and slightly higher shear).
Additionally, Monday should feature stronger forcing, which may also
aid in the thunderstorm/severe risk.

A cold front is forecast to move through Monday night, but this may
not completely shut down the thunderstorm risk right away. Some
guidance has trended a bit slower with the front, with the potential
for a wave to ride up along the front on Tuesday with another chance
of showers and thunderstorms. There isn`t yet a solid signal for
additional precip on Tuesday, but something to watch. Eventually, a
strong upper level trough is forecast to move through, providing
more of a clean sweep of low-level moisture and instability. This
will also usher in lower temperatures. Some areas inland may see
lows back in the 50s for a day or two late next week.

Prior to the arrival of the lower temps and dewpoints, there will be
a period of above to well above normal temps through Monday thanks
to warm low-level thicknesses and, in the absence of thunderstorms,
strong heating. This appears supportive of highs in the upper 80s to
low 90s inland, with low to mid 80s along the coast. Lows will be in
the upper 60s to low 70s. Near-record warm lows are possible,
especially Sunday night/Monday morning.

&&

.AVIATION /18Z FRIDAY THROUGH WEDNESDAY/...
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SHORT TERM /through Saturday/...
As of 3 PM Fri...Mix of VFR and MVFR currently across the
terminals, with scattered showers and tstms beginning to blossom
early this afternoon. Scattered to numerous showers and storms
expected through late this evening, which could bring periods of
sub-VFR. Better signal for fog and stratus development late
tonight into early Sat morning. There is potential for several
hours of IFR between 6-12z, with highest probabilities at PGV,
ISO and EWN. Conditions will return to VFR by mid Sat morning,
with scattered showers and thunderstorms developing in the
afternoon. Sub-VFR conditions could linger through much of the
day east of the terminals, mainly over the Outer Banks.

LONG TERM /Saturday night through Wednesday/...
As of 230 AM Friday...There will be an increased risk of TSRA
and accompanying sub- VFR conditions through early next week.
Gusty southerly winds can be expected as well, especially on
Monday.
-- End Changed Discussion --

&&

.MARINE...
-- Changed Discussion --
SHORT TERM /through Saturday/...
As of 3 PM Fri...Latest obs show SW winds 5-15 kt with seas 2-3
ft. Winds will shift tonight into Saturday as weak boundary and
low pressure push into the area. Light and variable winds 10 kt
or less expected Sat, mainly N/NE north of Lookout and S/SW
south. Seas 1-3 ft into Sat. Scattered tstms possible through
the first part of tonight, with more isolated chances Saturday.
Some storms have the potential for moderate to heavy rain,
lightning, gusty winds and hail.

LONG TERM /Saturday night through Wednesday/...
As of 230 AM Friday...

 - Approaching Small Craft conditions Monday/Monday night

 - Periods of thunderstorms through early next week

Several upper level waves will move through the ENC coastal waters
through early next week. Each wave will bring with it a chance of
showers and thunderstorms. A stronger wave, and associated cold
front, then moves through Monday/Monday night. Southerly winds will
increase to 15-20kt ahead of this front, and may approach 25kt for
some waters. Right now, though, the risk of widespread 25kt winds
appears low (<10% chance). Seas of 1-3 ft over the weekend will
increase to 3-4 ft Monday with the building winds. The highest seas
are expected south of Cape Hatteras.
-- End Changed Discussion --

&&

.MHX WATCHES/WARNINGS/ADVISORIES...
NC...None.
MARINE...None.

&&

$$
SYNOPSIS...MHX
NEAR TERM...CQD
SHORT TERM...CQD
LONG TERM...RM
AVIATION...CQD/RM
MARINE...CQD/RM