From LWX: Forecast Discussion
An upper-level trough will eject out of the southwest overnight
Friday night into Saturday. An area of surface low pressure will
form over Texas in response to this upper-level feature, and
move into the southeastern U.S by Saturday night. Ahead of the
main surface low pressure system moving across the southeast,
another weak area of upper-level energy will be moving across
our area Saturday afternoon into Saturday night, which will
provide some extra lift ahead of the main system. At the same
time, a strong surface high will funnel cold air in from the
north, while southwesterly flow above the surface overruns the
wedge of cold air. This combination of moisture and enhanced
lift will result in a period of snow starting late Saturday
morning, continuing into Saturday night. Snow associated with
the main surface low looks to move in early Sunday morning and
continue throughout the day on Sunday.
On Sunday, the primary surface low pressure system will slide
by to our south through the Carolinas. The precipitation from
this system will stretch northward and affect areas as far north
Pennsylvania. Temperatures will be plenty cold enough for snow
for the entire duration of this system, so precipitation types
will not be an issue. Latest runs of the operational Euro and NAM
are in fairly good agreement that the low will move off the
coast around Cape Hatteras, while the operational GFS took a
slightly more southern track. However, GEFS and EPS ensembles
seem to be in fairly good agreement that more closely resembles
that of the operational Euro and NAM. While some uncertainty
remains in terms of the exact track, it seems as though most
guidance is in decent agreement.