FFC AFD
.LONG TERM /Thursday through Tuesday/...
Long term forecast largely overshadowed with winter weather
potential for late Friday into Saturday. As previously mentioned,
many contributing factors must align for accumulations to occur,
but models seem to be coming into better alignment with the
potential for accumulations. Winter precip looks to begin Friday
evening (well after school release time), and continue into the
overnight period. Have opted to increase pops for the 00z- 18z
period Saturday, and with model temperatures cooler than
previously forecast, this spreads snow chances farther south and
east with this forecast package. For now, given the uncertainty
with the placement of the moisture axis and the timing of the cold
air into the state, have opted to not include accumulations at
this time. Several ensemble model members are suggesting a couple
inches of snow, but others are going with no accumulations at all.
As far as the more mainstream deterministic models, the CMC has
the moisture axis farther north, across the Atlanta metro area and
northward, with the better chances across the far northern metro
counties. The GFS suggests accumulations are possible across the
Atlanta metro, but keeps the best axis south of the southernmost
metro counties. For the ECMWF, the contributing ingredients do
not appear to line up to promote snowfall accumulations.
Confidence in the forecast is increasing as the latest model runs
(and run- to- run solutions) seem to converge to a similar
solution, and expect this to continue into into late week.
After the winter system moves out of the area, temperatures remain
chilly, and any accumulations would likely stick around into late
weekend.