Hurricane Erin is a Category 4 hurricane again, the National Hurricane Center said in its 11 p.m. ET update Sunday, with sustained winds of 130 mph and tropical storm-force winds reaching out 230 miles. The storm was just under a thousand miles southeast of Cape Hatteras, North Carolina, as of Sunday evening.

Erin is expected to continue to strengthen and could double or even triple in size as it moves north and west, causing rough, dangerous ocean conditions across much of the western Atlantic, the Hurricane Center said.

The powerful storm has undergone astonishingly rapid changes - a phenomenon that has become far more common in recent years as the planet warms. It quickly became a rare Category 5 for a time on Saturday, before weakening and becoming a larger system on Sunday as it ch

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