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Story summary
- A polar-vortex cold air mass is forecast to reach central and northeastern United States this weekend, potentially triggering the first major snowstorm along the Interstate 95 corridor.
- Snow is expected to begin in the Midwest on Saturday and reach Northeast by Sunday, contingent on cold air.
- Current models indicate a weakening polar vortex, which may allow colder temperatures to spread and lead to snowfall in Boston, Philadelphia, and New York.
