Hurricane Erin could 'at least double or triple in size' next week and the track has shifted south, but remains likely to turn away from the East Coast.

Erin has intensified to a Category Four Hurricane as it makes its way toward the East Coast of the United States.

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. It is now a rare Category 5, churning through the Atlantic Ocean north of the Caribbean.

Spaghetti models predict Erin will skirt the U.S. East Coast by hundreds of miles as it moves north through next week.

According to meteorologist Sam Lillo, Erin deepened by 70 millibars in 24 hours from Friday morning to Saturday morning. This makes Erin the most rapidly intensifying hurricane, before Sept. 1, ever measured in the Atlantic Ocean.

The NHC said it currently expected Erin to become a Category 4 storm later Saturday but to eventually swerve away from the continental United States.