By Steve Strouss

PHILADELPHIA (CBS)–Enjoy the seasonable temperatures now because the coldest air of the season is about to invade the Delaware Valley.

Temperatures will tumble this weekend as an Arctic blast spreads over the Eastern half of the US.

The high on Sunday will be 35 degrees in Philadelphia, the coldest day since mid February. In addition to the cold, we are also talking about wind chills.

A NW wind at 15 to 25 mph will make it feel more like the teens and 20s through the day. Despite some sunshine, Monday won’t be much better as high temperatures stay in the 30s.

After the cold, our attention shifts toward a storm that could bring us heavy rain and wind on one of the busiest travel days of the year.

Moisture will gather in the southern United States on Tuesday and a developing low pressure system will spread rain up the East Coast on Wednesday.

At this time there is a lot of uncertainty as to how far north the rain gets. If the Euro forecast model is correct, we are looking a solid soaking in Philadelphia on Wednesday but if the GFS forecast model is correct, it keeps the storm to our south and east and the heaviest precipitation moves offshore.

In either case, a strong high pressure system settles back in on Thanksgiving Day giving us another shot of cold air and wind in time for the holiday.

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