GSP trying to play catch up:
.NEAR TERM /THROUGH TONIGHT/...
As of 1100 AM: Light to moderate snow, with some areas of +SN
continues to overspread the Upper Savannah River Valley and the NC
mtns late this morning. The latest high res/ short term models
indicate partial thickness values are more than favorable for snow
across all but perhaps the extreme southeast part of the forecast
area, so p-type will hinge largely on surface temps. Mid clouds
overspreading the western part of the area just after sunrise
resulted in surface temps not warming as fast as previously
anticipated. While some warming from the south is expected to occur
into the afternoon, which could force a changeover to rain south of
I-85, it`s looking increasingly like locations across the western
half of the area, and along/north of I-85 will see mostly snow. The
Winter Weather Advisory has been expanded to include another row of
zones to the south of the old advisory. Even outside of the advisory
area, accumulating sub-advisory snowfall (< 1 inch
Piedmont/foothills), < 2 inches mountains are likely. The only
exception may be the I-77 corridor, where temps have warmed to
around 40, and guidance strongly agrees that liq equivalent precip
will only be around 0.05". Nevertheless, with surface wet bulb temps
still just below freezing, especially north of I-85, some dustings
will be possible in those areas.
The wave responsible for this mess will move rapidly east this
evening, with lingering precipitation paring back to the typical
west to northwest flow moisture areas before ending overnight. This
airmass will support max temps today some 15 to 20 degrees below
climo, with mins 1 to 2 categories below climo tonight.