York and Lancaster are very
close to warning criteria and we considered an upgrade with the
afternoon cycle, but will hold the line for now at 3-5" in
collab with WFO PHI.
Snow rates/intensity should taper off Monday afternoon, as the
low level jet and plume of deepest moisture shifts east of PA.
However, lingering light snow is expected into Monday evening
over the southern part of the forecast area associated with the
passage of the 500mb trough. Any snow from the departing low
pressure system should be over by 05Z Tuesday. A cold northwest
flow will then generate scattered late night lake-enhanced snow
showers over the NW Mtns and Laurels. However, low inversion
height suggest any accumulations will be very light.
Temperatures throughout the event will be cold (in the 20s)
which will keep precip types all snow (no ice/mix expected).
This will translate into a relatively dry/fluffy snow character
and allow for more blowing and drifting as the wind picks up
Monday night.