A powerful low pressure system over North Carolina will move off the Mid Atlantic coast over the next 36 hours leading to periods of heavy rain, snow, strong winds, and coastal flooding for the Philadelphia and New York City metropolitan areas.
Periods of rain will develop throughout the Philadelphia and New York City metropolitan areas with a mix of rain and snow over the interior. Winds will increase from the east to 15 to 30 mph with gusts over 40 mph expected. Temperatures will rise into the upper 30′s to lower 40′s over the interior and lower to mid 40′s along the coast.
The rain will gradually mix with and change over to snow from west to east tonight as the intensifying low pressure system tracks due east into the Atlantic Ocean. The most significant snow accumulations are expected over south-central Pennsylvania with up to 12 inches of snow will be possible. The snow accumulations over the Philadelphia and New York City metropolitan areas will depend on how fast the rain changes over to snow throughout the region. If the change over is fast, up to 6 inches will be possible for the Philadelphia metropolitan area and up to 3 inches over the New York City metropolitan area and Long Island. There is a potential for higher snowfall totals over southeastern Connecticut and eastern Long Island if mesoscale banding develops tonight. Wind will back from the east to northeast at 20 to 40 mph with gusts over 60 mph. Temperatures will fall into the upper 20′s to lower 30′s over the interior and lower to mid 30′s along the coast.
The low pressure system will gradually exit the region tomorrow with lingering rain and snow showers through tomorrow evening. Winds will back to the northwest at 10 to 20 mph with gusts over 40 mph. Temperatures will rise into the lower to mid 40′s throughout the region.
High pressure will take hold Friday on through Monday with tranquil weather conditions and above normal temperatures. A cold front will approach on Tuesday with periods of rain expected. Temperatures Friday through Monday will range from the lower to mid 30′s for lows and lower to mid 50′s for highs. Temperatures on Tuesday will fall into the mid to upper 30′s for lows and mid to upper 40′s for highs.