From Upton:
The trend with the track however, has been farther south and
east, meaning a colder solution and therefore more in the way of
snow, even along the coast. Much of the area will see plain
rain for Monday, with perhaps a rain/snow mix across the higher
elevation inland. As the low tracks east of the area, and
strengthens, strong cold air advection will ensue, allowing a
changeover to snow from northwest to southeast late Monday night
into Tuesday morning. This time frame is also a period of when
the heavier precipitation is expected. Heavy snow is expected
across the interior, while there will be heavy rain for the
coast.
By early Tuesday morning, the changeover continues, even towards
coastal areas, but by this point, the heavier precipitation will
have ended. This changeover continues moving south and east.
The snowfall forecast will be quite challenging as accumulating
snowfall is possible, even along the coast.