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Crisp fall air to bring first frost of season to parts of northeastern US

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Fall air has finally arrived in the northeastern United States and may yield the first frost of the season in parts of the region this weekend.

An area of high pressure will dive southward from Canada and promote sunny and dry afternoons and clear, chilly nights.

"For many locations, this weekend will deliver the lowest temperatures since last spring," according to AccuWeather Meteorologist Brett Rathbun.

While temperatures will hover within a few degrees of average, it will feel much cooler after the summer warmth to end this past week.

Highs in the 50s and 60s F will be common across New England, New York and northern Pennsylvania, through Monday. Highs in the 70s are expected across much of the mid-Atlantic.

Lows will dip into the 30s across most of New England and eastern and central New York on Saturday and Sunday nights. Portions of the Adirondack, Green and White mountains may dip into the 20s.

The brunt of the cool air will fail to reach areas west of the Appalachians, including the cities of Pittsburgh and Charleston, West Virginia, Rathbun explained.

The increasing length of the overnights as well as clear skies and calm winds will create an ideal environment for frost to develop in some of the coldest interior locations.

The first frost of the season may visit the countryside from northern Pennsylvania to upstate New York and western and northern New England during Sunday and Monday mornings, Rathbun stated.

The first frost typically occurs during late September in northern New England and upstate New York, and early October across the rest of the interior Northeast. Along the Interstate-95 corridor, the date of the first frost typically occurs during the middle of October.

Residents may want to bring potted plants indoors and/or place a protective covering over the most sensitive vegetation overnight.

Extra time may be needed when heading out the door in the morning to clean off frosty windshields.

While frost will not be a concern for most across the Northeast, jackets and sweatshirts may need to be brought out after the sun dips below the horizon.

The dry weather accompanying the cool push is expected to come to end from west to east late on Monday into Tuesday.

The same system that will threaten the central U.S. with flooding this weekend will bring the return of showers and heavier thunderstorms and a brief uptick in humidity across the Northeast early next week.