Area Forecast Discussion
Issued by NWS Raleigh/Durham, NC

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FXUS62 KRAH 210146

Area Forecast Discussion
National Weather Service Raleigh NC
945 PM EDT Wed Sep 20 2017

A mid to upper level trough will drift across the Carolinas through
Thu, then linger while weakening through the end of the week.
Surface high pressure will otherwise ridge south across the middle
Atlantic states for the next several days.


As of 945 PM Wednesday...

Convection continues to linger across the forecast area as an upper
level disturbance moves through. Some isolated thunderstorms have
cropped up mainly across the Triangle and points south but there are
also a few showers moving into the Triad area at this time. At this
point in the evening all convection is expected to be short lived
and of little consequence with the exception of some heavy rain and
possible cloud to ground lightning. As activity continues to
decrease, some clearing is expected to occur and MVFR visibilities
will be possible during the early morning hours. Lows overnight in
the middle 60s.


As of 245 PM Wednesday...

A vorticity disturbance will drift slowly eastward across eastern NC
on Thursday, and will eventually feed into the broad upper trough
extending SW from TC Jose off of the southern New England Coast.
This feature will support an isolated to slight chance of
weak/shallow convection, mainly across southern/southeastern
portions of the area.

H8 temps and low-level thickness drop off ever so slightly, so
perhaps a degree or two cooler when compared to today, but still in
the same ballpark with afternoon highs in the 85-90 degree range.
Any convection will die off with loss of heating. Overnight lows in
the mid to upper  60s.


As of 257 PM Wednesday...

Friday through Sunday will feature fair weather thanks to ridging to
our north, and the flow assoc with this ridge resulting in a drying
trend during that time. Thus we can expected decreasing clouds on
Friday, then mainly clear skies for the weekend.  Models also show
subtle low level thickness decreasing trend during this same time,
so expect temps in the low to mid 80s, rather than the mid to upper
80s that we`ll see in the near and short term periods.  Lows in the

Still quite a bit of uncertainty regarding the first half of next
week related to the track and possible impacts with Hurricane Maria.
Right now most models suggest that Maria will stay well to our east
with little or no impacts on our weather across central NC Tuesday
into Wednesday, other than perhaps a few passing showers on the far
western periphery of the storm and perhaps a period of breezy
conditions. However, there`s still plenty of time for things to
change, so continue to stay tuned!


As of 825 PM Wednesday...

Generally VFR conditions are expected, though with a chance of MVFR
visibility restrictions in fog at all cntl NC TAF sites Thu morning,
and with some brief periods of IFR restrictions at KRWI.

Otherwise, the presence of a mid to upper level trough, and
associated pocket of colder temperatures aloft, may result in the
development of a few showers and/or storms mainly around FAY and RWI
on Thu, followed by another chance of MVFR-IFR fog Fri morning, also
mainly at FAY and RWI.





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