(CNN) — Erin was a Category 3 hurricane Sunday, the National Hurricane Center said in its 2 p.m. ET update, with sustained winds of 125 mph, with tropical storm-force winds reaching out 205 miles.

The storm is expected to continue to fluctuate in intensity, and could double or even triple in size as it moves north and west, causing rough 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 Saturday, before weakening and becoming a larger system on Sunday as it churns through the Atlantic Ocean north of the Caribbean.

Erin went from a Category 1 hurricane with 75 mph win

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