Forecast uncertainty increases by Wednesday. The GFS has been
very persistent over the past few days in bringing a notable
clipper system across the Great Lakes, with a shield of
accumulating snow crossing our region. The ECMWF has been
equally persistent in keeping this feature much weaker and
suppressed, with no more than a few light snow showers in our
area. The Canadian GEM continues to be a compromise solution
with a light snowfall across the region. Given the continued
model uncertainty, will keep POPS in the chance range for now.
If this snow does materialize, it will end later Wednesday night
as the system moves to the eastern seaboard.
A strengthening area of low pressure will track from the western
Ohio Valley and cross the Central Great Lakes Friday night into
Saturday afternoon. With this system precipitation will overspread
the area, initially as snow then changing to rain as warm air
advection increases ahead of an accompanying cold front. Winds
behind this area of low pressure will increase and wind headlines
may be needed for Sunday. Behind this area of low pressure a large
trough will persist through this time period with the potential for
snow showers across the area and lake effect snow off of both lakes,
especially the more ice free Lake Ontario, where a multi lake
connection looks possible.