Additional waves of cool air will take the Northeast into the middle of September. Each will bring a taste of early Autumn and frost could again touch the coldest spots.
Temperatures dipped to 34 degrees Friday morning in Bradford, Pa., Houlton, Maine, and Lyndonville, Vt. Meanwhile, Saranac Lake, N.Y., dropped into the upper 20s.
More fall weather is in store before the official start of autumn on Sunday, Sept. 22, 2013. The next wave of cool air will arrive Sunday with the next chance of frost for the normally colder spots of the interior Northeast set for Monday morning.
According to Long Range Weather Expert Joe Lundberg, "Temperatures are likely to average a few degrees below normal into the middle of the month."
While a weather pattern for the next two weeks may not be liked by warm weather fans, it will bring great air quality most days and comfortable conditions for those doing manual labor.
The pattern will translate to many cool nights and days with low humidity.
It will also mean only a few days with warmth and moderate humidity. These will generally be limited to the day before a new push of cool air is on the way.
Only a few opportunities for rainfall are likely with the pattern. Most of these rain dates will also be limited to the day a cool front is coming through.
According to Northeast Weather Expert Dave Dombek, "The setup will bring another chance of frost for frost in the normally cold spots of the central Appalachians northward to interior New England Monday morning."
Temperatures could dip into the middle and upper 30s in some of the valleys.
"With the chilly air Sunday night into Monday morning, the coldest spots of northern Pennsylvania to upstate New York could dip into the upper 20s and lower 30s," Dombek added.
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.
A persistent southward dip in steering winds, high in the atmosphere, known as the jet stream, will direct one Canadian air mass after another across the eastern Great Lakes, New England and the mid-Atlantic into the middle of the month.
The same southward dip in the jet stream in the Eastern states will tend to keep tropical storms and hurricanes away through much of next week.
Meanwhile, a northward bulge in the jet stream over the middle of the nation will allow heat to build over the Central states into the middle of September.
According to Long Range Weather Expert Jack Boston, "Some warmth is likely to return to the Northeast during the second half of September into part of October."
While the pattern a few weeks from now may not bring record warmth, it could result in stretches of above-normal temperatures, before colder air works in during November.
During that next warmup, the door to the tropics could be opened along the Atlantic coast of the U.S.
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