From GSP
.LONG TERM /THURSDAY THROUGH SUNDAY/...
As of 330 am Monday: A rather progressive upper air pattern will
result in unsettled weather during much of the medium range, as a
series of short wave troughs are forecast to interact with a
baroclinic zone draped across the Southeast. The extended period
will begin dry and cool, but pops will gradually ramp up late Thu
into Friday, during which time moisture and upglide associated with
a developing Gulf Coast surface wave are expected to overspread the
Southeast. Owing to the cool and dry conditions, and precip falling
Fri morning could fall as light freezing rain, mainly across the
mountain valleys near the Blue Ridge and along the I-40 corridor in
the Piedmont and foothills. While light accums cannot be ruled out,
and pronounced in-situ/hybrid cold air damming will likely develop
in response to any falling precip, current guidance indicates that
parent surface high pressure will be in an unfavorable location to
lock in sub-freezing temps for any significant length of time. Thus,
a quick transition to rain is forecast by Fri afternoon. Likely pops
will otherwise be advertised by Friday afternoon, continuing into
Saturday before slowly tapering off late Sat/Sat night. Dry
conditions should return by Day 7. Temps will begin the period below
normal, possibly ending up well below normal under Friday`s cold air
damming regime, then return to above-normal levels by Day 7.
