After a few days of quiet weather, a stout
trough swings into the
area, returning the chances for showers and thunderstorms. Current
guidance depicts a developing low over the central plains and
ejecting northeast and dragging a strong cold
front toward the
CWA
Sunday night into Monday. Ahead of the
front on Sunday, pre-frontal
isentropic lift looks to occur, increasing
PoP chances across much
of the region. This is expected to remain more showery than
convective as guidance doesn`t have much in the way of
instability
on Sunday. Additionally, southeasterly winds pick up across the
area, increasing gusts across the entire area. Though 15-25 mph
gusts are possible, winds should remain well below any Wind Advisory
criteria. As the
front approaches and provides better lift of
parcels, the severe threat increases. At of this forecast, the
timing of the
front has slowed down from previous model runs,
meaning the
probability of severe weather is increasing. Since the
front is looking to cross into the area during the daytime hours,
this increases the chances for better
instability, especially east
of the mountains. Current guidance shows a 40-50% chance of
sbCAPE
of 500
J/kg or higher, with the eastern fringe of the
NC Piedmont
and portions of SC highlighted. This lines up with the current Day 4
outlook from the Storm Prediction Center. Additionally,
shear with
this system also packs 50-60kts at the 850mb level and plenty of
moisture at the surface. So, for the time being at this current
forecast, all hazards are possible. As for any
tornado potential,
guidance does show a decent amount of 200-250
SRH during the later
afternoon period on Monday. What this indicates is the environment
is supportive of spinning up the lower levels, which could lead to
the development of a brief
tornado along the leading edge of the
convective line.
Thoughts from GSP.
Edit : this came out before the new SPC outlook for Monday came out and expanded the enhanced and slight risk farther west I think.