CTP on board:
.SHORT TERM /THURSDAY NIGHT THROUGH SATURDAY NIGHT/...
Arrival of 1030mb high pressure ends snow shower activity
Thursday evening with clearing skies. Low temps trend about 10F
lower night over night with minTs in the mid teens to low 20s
Friday morning. Fair wx to end the week with sunshine giving way
to increasing clouds Friday night ahead of weekend storm
system.
The weekend coastal storm has its origins in the Four Corners
region of the southwest US Thursday afternoon, with another area
of low pressure forming along the Mississippi Gulf Coast by
later Friday. The broad, double barrel low will track to near
the Delmarva region by 00z Sunday, when the coastal low becomes
dominant.
The potential still exists for a high end advisory to low end
warning level snow event. Snow onset timing looks like Saturday
morning to early afternoon with precip spreading from south to
north across CPA. Heaviest snowfall would most likely be in the
afternoon/evening into the first part of Saturday night with,
with lighter snow tapering off between 12-18Z Sunday. The
greatest uncertainty with rain/snow ptype is from I81/78 to the
I95 corridor.
&&
.LONG TERM /MONDAY THROUGH WEDNESDAY/...
The transition to a very active flow pattern over North America
is forecast to continue during the long term period. Monday
will be a quiet day, after what is forecast to be a considerable
coastal storm over the weekend likely bringing the first
significant snow for Central PA in some time, another wintry system
looks promising for mid week. At the current time, the mid week
storm system is forecast to be stronger and with a track of the
primary sfc low going west of PA. This presents a snow to mix
to rain scenario for the region.
Another key impact with this storm is the potential for
strong winds with MSLP anomalies (sub 990mb) reaching 3-4SD
below the mean.
Much too early for details, but much excitement for sure for
snow lovers as we plunge into the New Year.
