Winter Storm Watch posted for SE Pa.

Last updated: Tuesday, November 25, 2014, 6:41 AM

The national weather service has posted a Winter Storm Watch for Southeastern Pennsylvania effective Wednesday, one of the busiest travel days of the year.

Depending on location, snow accumulations of 1 to 5 inches are expected before the storm ends late Wednesday, the NWS said.

The precipitation will fall as rain and mix of rain and snow in South Jersey.

The storm watch, which covers southeast Pennsylvania and New Jersey north of Mercer County, goes into effect Wednesday morning, when rain is predicted to mix with snow. Temperatures will be in the low 30s.

The heaviest snow is expected north and west of Philadelphia.

The day before Thanksgiving is one of the busiest travel days of the year and snow also could affect flights as well as road conditions.

'Anyone with holiday travel plans Wednesday should complete travel by mid-morning Wednesday to avoid any significant weather related delays,' the NWS advised.

'There is a small chance wet snow could knock down a few tree limbs if it accumulates more than 4 inches on branches and wires. This could result in a few power outages,' the weather service said.

In contrast, the forecast for today calls for mostly sunny skies with a high around 60.

This story will be updated during the day.