A cold front backed down the Northeast coast yesterday, first chilling Boston, then Providence, before reaching New York City overnight. Today and tonight, some of the cool damp air takes over from Philadelphia to Washington, DC.
As the easterly flow weakens late tomorrow and Friday, the cool air will start to erode. Then, as a pocket of cold air aloft takes over in New England, we expect afternoon and evening showers and perhaps thunderstorms to dot the the region Friday and perhaps Saturday.
A ridge over the Midwest appear likely to expand eastward to promote a warming trend for the Middle and North Atlantic states later in the weekend. This video has more.
Using a detailed pressure analysis, we can determine the locations of frontal boundaries that help determine the temperature regimes controlling various places.
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