Millions in the Northeast and Mid-Atlantic are in the zone of severe weather potential today as a cold front slices into what has been an unseasonably warm and humid early-October air mass.
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As the cold front marches toward the Eastern seaboard, a band of rain and thunderstorms along the front is expected to intensify Monday afternoon as strong low-level winds overspread the region and the storms move into an environment with high dewpoints (atmospheric moisture). This combination will be favorable for damaging wind gusts to develop with some of these storms. An embedded spin-up tornado cannot be ruled out in this situation.
This activity is expected to sweep east into western New England by early this evening before starting to weaken farther east.
http://www.weather.com/news/tornado-central/severe-weather-tracker-page