Hurricane Erin strengthened into a powerful Category 4 storm Saturday in the Caribbean, where it threatened to dump flooding

Erin is the first hurricane to develop over the Atlantic this year, and meteorologists are closely tracking its path and forecast.

CNN By CNN Meteorologist Mary Gilbert, Allison Chinchar, Rebekah Riess, Andrew Freedman, CNN (CNN) — Powerful Hurricane Erin has undergone a period of astonishingly rapid intensification — a phenomenon that has become far more common in recent years as the planet warms.