116
FXUS62 KMHX 170618
AFDMHX

Area Forecast Discussion
National Weather Service Newport/Morehead City NC
218 AM EDT Fri May 17 2024

.SYNOPSIS...
High pressure briefly builds overhead to end the work-week with
another unsettled weekend ahead with low pressure system
impacting the area into early next week.

&&

.NEAR TERM /UNTIL 6 AM THIS MORNING/...
As of 200 AM Friday...Upper ridging continues to build in from
the SW tonight, resulting in mostly clear skies and calm winds
for much of mainland ENC. Sern and Wern zones currently forecast
to see some patchy fog develop in the early morning hours with
clearing skies and decoupling winds allowing decent rad cooling
and ample SFC moisture from the rainfall we`ve had the last two
days providing the fuel. Currently not expecting widespread
dense fog, but select sheltered spots could see periods of dense
fog. Lows in the upper 50s inland, low 60s for beaches. High
cirrus is moving in from the west, which will help keep temps
from dropping any lower than the forecasted lows.


&&

.SHORT TERM /6 AM THIS MORNING THROUGH 6 AM SATURDAY/...
As of 200 AM Friday...No major changes with the forecast. Area
of highest moisture convergence and instability in the
afternoon and evening Friday continues to be
Duplin/Onslow/Jones/Lenoir counties as the sea breeze advances.

Previous Discussion...As of 1515 Thursday...Ridging crests over
the area Friday but shortwave energy will be approaching that
could aid in initiating a few showers during the afternoon,
generally along the seabreeze as it migrates inland. Instability
will be meager with MUCAPE less than 1kJ/kg and the ridging
aloft keeping kinematics less than impressive, in turn limiting
any severe potential, however a rumble of thunder or two can`t
be ruled out. MaxTs a few ticks warmer than Thursday for inland
zones, low 80s most. Cooler Ts expected along the coast where
marine air will be felt as the seabreeze penetrates further
inland than Thurs.

&&

.LONG TERM /SATURDAY THROUGH THURSDAY/...
As of 300 PM Thursday...Regarding the unsettled weather this
weekend, deterministic, ensemble, and analog guidance all show
at least a weak to modest signal for severe weather, especially
on Saturday. The signal isn`t as strong on Sunday, but is still
present. The Storm Prediction Center (SPC) has outlooked all of
Eastern NC in a "Marginal" risk of severe weather for Saturday,
and this seems reasonable given all of the above. Of note, one
potential complicating factor is the evolution of a warm front
Friday night into Saturday, which could support an increased
coverage of showers and thunderstorms Saturday morning. If this
occurs, it could have an impact on how much instability can
develop later in the day and into the evening. The key message
here is to be aware of the potential for strong to severe
thunderstorms on Saturday. We`ll continue to refine the risk
area and potential hazards in the coming couple of days.

Previous Discussion...High pressure will be across the area
Friday but another low pressure system will impact the area this
weekend. High pressure builds back in toward the middle of next
week.

Friday night through Sunday night...A complex low pressure
system will impact the region through the weekend. A southern
stream wave will transport ample gulf moisture into the region
Friday night into Saturday with sfc low pressure moving across
the region late Saturday or early Sunday. The system then
transitions into a vertically stack low as it slowly pushes
across the Mid-Atlantic and off the coast through the latter
half of the weekend. As with most cut-off systems, there are
differences among the models with the evolution, timing and
track with this system but unsettled weather will impact the
region through much of the period. Beneficial rainfall is
expected with much of the area forecast to receive around 1.5-2"
with locally higher amounts possible.

Monday through Wednesday...The upper low slowly slides southward
early next week with high pressure building across the Mid-
Atlantic. There could be a few lingering showers into Monday but
expect dry conditions into Wednesday. A mid level shortwave and
attendant cold front approaches the area late Wednesday but
moisture looks limited at this time with deep layer westerly
flow providing subsidence to the lee of the Appalachians.

&&

.AVIATION /06Z FRIDAY THROUGH TUESDAY/...
SHORT TERM /through Thursday night/...
As of 200 AM Friday...Shallow fog development has begun for OAJ,
fluctuating between IFR and MVFR categories. Remainder of TAF
terminals are currently VFR. Southern regions of the CWA (KOAJ)
are where most of the rain has fallen over the past 2 days. The
presence of ground moisture in this region and calm winds
result in an increasing chance of fog formation through 12Z. OBX
will be experiencing sub-VFR ceilings through the morning extending
from the deepening low offshore. After fog subsides this
morning, we have a slight chance of thunderstorms developing
along and ahead of the sea breeze this afternoon and evening.

LONG TERM /Friday through Monday/...
As of 330 PM Thursday...Pred VFR expected through Friday but
could see isolated showers during the afternoon bringing brief
periods of sub-VFR. A low pressure system will impact the area
through the weekend bringing periods of sub-VFR conditions
Friday night through Sunday.

&&

.MARINE...
SHORT TERM /Today and Tonight/...
As of 1515 Thursday...Seas continue subsiding from 2-4ft
presently becoming 2-3ft overnight. Winds currently light and
variable. Overnight, winds S of Hatt become predominantly Werly
10-15kt with Nern waters seeing NNEerly winds around 10-12kt.
These Nerly winds continue working S down the coast to become
Nerly 5-10kt S of Hatt, Nerly 10-15G20kt N of Hatt in the early
morning hours. Seas respond to winds Fri becoming 2-4ft from N
to S, 3-5ft over outer central waters.

LONG TERM /Friday through Monday/...
As of 315 PM Thursday...High pressure will be over the waters
Friday with winds generally less than 15 kt and seas around 2-4
ft, but could be locally higher near the Gulf Stream. A complex
low pressure system will impact the region Friday night through
Sunday bringing unsettled weather through the period. Guidance
for the most part keeping conditions below SCA criteria through
Saturday night as low pressure transits the Southeast. The best
opportunity for SCA conditions will develop sometime Sunday and
continue into early next week with N to NE winds as low pressure
deepens as it pulls offshore. There are differences among the
models the timing and track of this system, so be sure to follow
updates as details come into focus.

&&

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

&&

$$
SYNOPSIS...MHX
NEAR TERM...RJ
SHORT TERM...CEB/RJ
LONG TERM...SK
AVIATION...SK/RJ
MARINE...SK/CEB