MIAMI — Hurricane Irma was downgraded to a Category 4 storm early Saturday, as the eye of the storm moves along Cuba and inched closer to South Florida, the National Hurricane Center said.

The center extended a hurricane warning along the Florida West coast from Anclote River to Chassahowitzka, the National Hurricane Center said, as well as northward along the Florida East coast.

Governors of four Southeast states declared emergencies ahead of Irma making landfall in the U.S. Here is what we know:

Where is Hurricane Irma now?

As of 5 a.m. ET, Irma was downgraded to a Category 4 storm as it moved over Cuba's Camaguey Archipelago. The storm's winds were measured at 155 mph, according to the National Hurricane Center. The center of the storm was located 245 miles south-southeast of Miami and was moving northwest at 12 mph.

Where is Irma heading?

Current tracking shows the center of the storm moving near Cuba's north coast on Saturday, near the Florida Keys early Sunday morning, and then traveling near the southwest coast of Florida on Sunday afternoon, the National Hurricane Center said.

What part of Florida is under the hurricane warning?

The National Hurricane Center had initially issued a hurricane warning for most of South Florida. Early Saturday morning, the hurricane warning had been extended northward toward the central part of the state, including Lake Okeechobee. A hurricane watch has been extended north of the Volusia/Brevard County line to Fernandina Beach and north and west of Anclote River to Indian Pass, the National Hurricane Center said.

Will Irma hit Florida?

The National Hurricane Center’s forecast path for Irma moving toward the west, hitting the Florida Keys and southwest Florida on Sunday. The storm is "still expected to remain a powerful hurricane as it approaches Florida," the center said early Saturday.

"I'm afraid Irma is going to track too far west and put most of South Florida right in the eyewall," Colorado State University meteorologist Phil Klotzbach said.

Contributing: Doyle Rice, Bart Jansen, Alan Gomez, Gregory Korte, Caryn Shaffer, Joseph Bauccum and The Associated Press