Accumulating snow is on the way for tomorrow night in the Philly metro region as well as across much of southern New Jersey and northern Delaware. Weak high pressure will lose control of the weather around here early tomorrow as it shifts off the east coast while a low pressure system heads northeast from the southeastern part of the country towards the Virginia Capes. The air will be only moderately cold for this system; consequently, precipitation that begins during the afternoon hours should be in the form of rain. However, once the low scoots to the coast and our winds shift to a more northerly direction, colder air will move in and the rain will mix with sleet and snow and then the precipitation will change to all snow early tomorrow night (perhaps around 6 or 7pm). Accumulations are likely by late tomorrow night in the 2-4 inch range as temperatures drop to just below the freezing mark.