Area Forecast Discussion
Issued by NWS Wilmington, NC

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FXUS62 KILM 251437

Area Forecast Discussion
National Weather Service Wilmington NC
1030 AM EDT Sun Jun 25 2017

A surface trough near the coast will interact with tropical
moisture to produce a few showers and thunderstorms through
early Monday. Another weak front may bring a few showers or
a thunderstorm on Tuesday, followed by drier and cooler air
through mid-week. A warming trend will develop late week through
next weekend along with returning humidity.

As of 1030 AM Sunday...Some conflicting signals maybe developing in
this morning`s guidance. The front has made some progress across the
CWA, now through Florence and Lumberton despite the latter`s lack of
wind shift. This is a bit quicker than even the latest 12Z WRF,
though it seems the boundary has likely about ground to a halt. Now
to figure out where this setup will yield the best rain chances.
Ostensibly they should be along and ahead of the front as per the
current forecast. The WRF has come in with an interesting solution
however showing little to none as expected (save for Gtown Cty)
through evening and then blows up activity along and behind the
boundary tonight. Unless the 12Z GFS and/or some SREF data starts
supporting this the forecast will remain as-is in showing mainly a
diurnal convective signal slightly favoring coastal areas ahead of
the boundary.


As of 3 AM Sunday...Heating and marginal moisture may produce a sea
breeze shower Monday but Tuesday appears to offer better chances of
rain, as an upper trough axis brings short-wave energy and deepening
mositure late in the day Tuesday. Cool air advection will follow
this feature into early Wednesday and few cool spots daybreak
Wednesday may even dip into the very upper 50s. Expect lower
dewpoints into mid-week as well, removing the muggy edge to the air.
Exceptionally dry air aloft will arrive.
No severe weather signatures in the cards for Monday/Tuesday and low
level winds will remain weak during this time frame. Tuesday will be
the warmest day with downslope wind flow ahead of a short-wave
passage late in the day.


As of 300 PM Saturday...Longwave 5h trough over the eastern CONUS at
the start of the period lifts east-northeast Wed. Surface high
building in from the north will move overhead Wed and off the coast
by Thu. As the Bermuda High sets back up Thu the pattern aloft will
transition from flat/progressive flow late Wed into Thu to weak, but
strengthening 5h ridging over the western Atlantic late in the week.
Arrival of the 5h trough will be accompanied by an anomalously dry
airmass. Forecast soundings drop precipitable water values under
half an inch Tue night into Wed. The exiting trough and then the
building 5h ridge will produce a significant amount of subsidence
through at least Thu which, combined with dry air, should keep the
region dry. Moisture starts to creep back in Fri as the surface and
mid level ridge setup in a more typical summer time location.
Moisture return may not be enough to support much more than isolated
sea breeze convection on Fri. Coverage will increase Sat with both
the sea breeze and the Piedmont trough becoming more active. Temps
early in the period will run about 5 degrees below climo as an
unseasonably cool and dry air mass builds in. Development of return
flow Thu will return temperatures to climo late in the period.


As of 1020z...A mixed bag this period, initially areas of IFR cigs
across inland terminals becoming MVFR to VFR after 14Z.
Surface trough inland and ample moisture will set the stage for
scattered showers and TSTMS into the afternoon hours as heating
gears up. This will produce areas of MVFR ceilings and VSBYS and
will persist until middle evening before coverage and intensity
decrease. Overnight areas of IFR ceilings inland as low level
saturation and wet ground conspire.

Extended Outlook...Flight restrictions possible with isolated
showers and thunderstorms early Monday and again Tuesday during the
afternoon hours.


NEAR TERM /THROUGH TONIGHT/... As of 1030 AM Sunday...No changes to
the forecast at this time.

As of 3 AM Sunday...Winds and seas are in a much more summer like
pattern this morning unlike this time last night when a strong low
level jet was in place. Currently a southwest flow of 10-15
knots is  in place with seas of 2-4 feet is being reported and
this should more or less continue through the forecast period.
Winds may actually drop a little more according to most
guidance. The southerly component should remain however as a
front well to the west will have a difficult time moving across
the waters. Seas will drop to a more narrow range of 2-3 feet.

As of 3 AM Sunday...Changeable winds this period but it won`t be
a problem since speeds will hold at 15 KT or less. A series of
weak cold fronts will bring N winds, with winds veering briefly
ahead of each front. Seas should hold in a 2-3 foot range this
period and likely closer to 2 feet, in a mix of weak SE swell
and light to moderate chop. Showers or a storm will impact
mainly the outer waters this period and mostly Monday and Monday

As of 300 PM Saturday...Northeast flow Tue following passage of
a cold front prior to the start of the period will continue
into Wed. Northeast flow starts a slow veering trend later Wed,
becoming easterly Wed night and ultimately southeast on Thu.
Gradient will remain weak for much of the period with speeds 10
kt or less. Exception will Tue night when a surge of cooler air
spreading down the coast pushes northeast flow close to 15 kt.
Seas will be around 2 ft through the period.





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