Winter will make its first cameo in the eastern United States later this week as a storm ushers in the coldest temperatures in six months for tens of millions of people and the first snow for some.

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The storm will become a nor’easter when it reaches the Northeast coast, shaking up a period of relative tranquility in the region and becoming the first notable storm since September’s early season nor’easter.

Nearly 200 million people east of the Mississippi will experience their coldest temperatures since spring as a tease of winter plunges south from Canada in the storm’s wake.