Weather Authority: Sunday 9 a.m. Forecast

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The Brief

A wave of Arctic air is sliding into the Mid-Atlantic this week, set to bring the coldest temperatures of the season so far to the Philadelphia area.

While heavy snow isn’t a sure bet locally, the forecast raises the risk of overnight freezes, icy surfaces and early winter disruptions.

The pattern is tied to the strengthening La Niña event — which could mean a longer, tougher winter ahead for the region.

The Philadelphia region may be trading fall for winter a bit earlier than normal. Meteorologists warn that a sharp push of Arctic air will arrive by this weekend, sending overnight lows into the 20s and 30s, and keeping daytime highs stuck in the 40s for several days.

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