Ahead of what forecasters described as a “tranquil” weekend, parts of Massachusetts could see isolated thunderstorms beginning around midday Friday.

The thunderstorms will arrive on the back of a cold front moving into the Berkshires Friday morning, then slowly drifting east across the rest of the Bay State. As the front moves toward Central Massachusetts, it will collide with an axis of deeper moisture and instability, creating a “solid or nearly solid line of thunderstorms,” National Weather Service forecasters wrote.

The storms should start developing between 1 and 3 p.m. in central Massachusetts and eastern Connecticut, then head east or southeast to the Metrowest-Greater Boston-Providence corridor around rush hour, or between 3 and 7 p.m.

From there, the storms should drift down to

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