Winter storm brings snow to Northeast, causing travel disruptions and school cancellations

NEW: More than 1,000 flights canceled so far Tuesday morning , mostly at the airports in the New York City area and in Boston .

NEW: Massachusetts Gov. Maura Healey told all non-essential Executive Branch employees to not report to work Tuesday .

The Pennsylvania Department of Transportation temporarily reduces the speed limit on several interstates to 45 mph (72 kph) in the east-central region.

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