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Good morning.

Here’s what you need to know:

Beware the “bomb cyclone”

• Icy winds and heavy snow are expected today in the Mid-Atlantic and Northeast as a powerful winter storm that delivered rare snowfall to Florida heads north. Our live briefing has the latest.

The storm is being called a “bomb cyclone” for its sudden drop in atmospheric pressure (our video explains). Flights have been canceled, and schools have been closed up and down the East Coast.

• The bitterly cold weather has heating-oil providers working overtime. Power generators are switching from natural gas to coal and petroleum to meet demand.