AccuWeather: Arctic Air Moving In Tonight

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Cecily Tynan has the latest with AccuWeather. (WPVI)

The leading edge of the coldest air of the season pressed in today. Despite mostly cloudy skies, we've managed to hit 46 degrees this afternoon, which is seasonably chilly. Meanwhile, off to our west, temperatures in Pittsburgh as of mid afternoon have already dropped into the 20's as arctic air is bleeding eastward.

TONIGHT: It will be breezy out of the west-northwest at 12-20 mph ushering in those cooler temps. Lows will range from 26 in the outlying suburbs to 29 here in Center City. When you factor in the wind, what you will wake up to tomorrow is wind chills in the mid teens northwest and wind chills near 20 here in the metro area.

FRIDAY: Bright morning sunshine will quickly give way to a deck of stratocumulus clouds for the afternoon. Temps will struggle to hit 39 with wind chills during the afternoon only reaching the mid to upper 20's. Winds out of the west-northwest will be sustained at 12-25mph with gusts 30-35mph. Hats, scarves, gloves and winter coats are all smart ideas.

SATURDAY: Winds relax some, but it remains cold and breezy with a high of 38. A decent amount of sunshine is expected with some instability clouds popping in the afternoon.

SUNDAY: We'll start the day with clouds and end the day with clouds, which should keep temps to 39 for yet another day. A lead piece of energy will die out as it spreads eastward, but could give us a few flurries during the afternoon.

MONDAY: A stronger piece of energy will lead to the development of low pressure to our west and that will then cut northward during the night into Monday. What this means for us is warming southerly winds out ahead of it across our area. Initially enough cold air will be in place for the northwest suburbs that they see a period of snow or mix Sunday night into Monday morning before transitioning over to rain in the mid to late morning. A light accumulation of snow could cause problems for the Monday morning commute in these areas. Here in Philadelphia and areas south and east we will see a mainly rain event with 1/4" to 1/2" possible. The exact details of this system will depend on its strength and track so some changes are anticipated, but this gives you an idea of what we are thinking at this point. Right now, we're calling for a high of 46.

TUESDAY: Its partly cloudy, brisk and chilly with a cooler high of 42. Some additional afternoon rain is possible.

WEDNESDAY: The next Arctic front arrives, with the opportunity for more rain and snow showers. The high: 41

THURSDAY: Look for a mostly sunny, very cold day with a high of only 34.

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