GYX has gone from Advisory to Warning, ft
12z deterministic guidance as well as many ensemble
members have increased QPF some. In addition, coastal
frontogenesis tonight looks to enhance snowfall on portions of
the coastal plain through a period of stronger low level forcing
and better snow growth. Low pressure will likely form along the
coastal front off the southernmost ME coast as the short wave
trough continues to approach. This low will move northeastward
overnight and Sunday morning very near the Maine coast and
likely act to locally enhance snowfall rates. As such we have
bumped up snowfall totals a bit across some of the area (mainly
on the Maine coastal plain northeastward to the Midcoast). Have
therefore converted the winter weather advisory to a winter
storm warning where zone averages are 6 inches or more.
w.