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More Chill, Frost Concerns Headed to the Northeast

More Autumnlike chill is headed back to the Northeast, but there is good news for those who want summer warmth to hang on.

Following the passage of a cool front, a significant drop in temperatures will occur from Saturday to Sunday from the Great Lakes to northern New England.

The I-95 corridor from Baltimore to Philadelphia to New York City to Boston will notice cooler and less humid conditions by Monday.

Prior to the cooler air's arrival, showers and thunderstorms will continue to rumble along and ahead of the approaching front this weekend.

Showers and thunderstorms will remain most numerous with occasional downpours from Michigan to the eastern Great Lakes and northern New England through Saturday night.

The activity will become spottier as it reaches the rest of the Northeast late Saturday night into Sunday, limiting the disruptions to outdoor plans.

The core of the chill will settle across northern New England and northern and western New York, where Sunday's highs will be held roughly 10 degrees below normal. Brisk winds ushering in the cooler air will add to the chill.

As the winds calm and skies clear, a near repeat of Thursday night's chilly temperatures and frost concerns will unfold on Sunday night across the Northeast.

The frost should once again be primarily confined to the typically colder spots of the interior from northern Pennsylvania to New Hampshire, forcing residents to once again cover or move tender plants and vegetables inside.

Clouds spilling down from central Quebec should spare northern Maine from frost concerns. The air will be too "warm" for frost near the I-95 corridor and from central Pennsylvania southward, but many will likely want to wear jackets to work or school on Monday morning.

"The lengthening nights with clear skies can also create the perfect conditions for late-night and early morning fog, especially in the river valleys, where and when winds diminish," stated AccuWeather.com Expert Senior Meteorologist Alex Sosnowski.

As quick as the cool air filters into the Northeast, a surge of warmth and humidity will return for Tuesday and Wednesday. Temperatures on Wednesday are expected to reach or approach 90 degrees northward to Philadelphia.

The sticky conditions will persist through Thursday before another blast of cool air arrives late in the week. The clash of these two distinct air masses threatens to spark potentially damaging thunderstorms on Thursday afternoon.

The threat for such thunderstorms currently appears greatest from southeastern New York to Virginia, encompassing New York City and Washington, D.C.