MIAMI (CBSMiami) – Tropical Storm Isaac is passing through the north coast of Cuba and the Andros Island as it continues to approach Florida and the Florida Keys.

The National Hurricane Center says a hurricane hunter aircraft is entering the system to collect more data.

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Across South Florida, emergency managers have opened shelters and issued voluntary evacuations for high risk areas.

Hurricane watches and warnings remain in effect for South Florida and the Keys.

At 2 a.m., the center of the storm was located about 35 miles east northeast of Camaguey, Cuba and about 265 miles east southeast of Key West. The storm’s maximum sustained winds remained 60 mph with some higher gusts and it was moving to the northwest at 17 mph.

A HURRICANE WARNING is in effect for: the Florida Keys, including the Dry Tortugas; the west coast of Florida from Bonita Beach southward to Ocean Reef and to Florida Bay and Andros Island.

A HURRICANE WATCH is in effect for: the Florida East Coast from Golden Beach southward, Florida’s West Coast from Indian Pass southward,  Andros Island in the Bahamas.

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A TROPICAL STORM WARNING is in effect for:  the Cuban provinces of Ciego de Avila, Sancti Spiritus, Villa Clara, Camaguey, Las Tunas, Granma, Holguin, Santiago De Cuba, and Guantanamo, the Bahamas, Turks and Caicos Islands, The Florida East Coast from Sebastian Inlet Southward, Lake Okeechobee, the Florida east coast from north of Sebastien Inlet to Flagler Beach, and for the west coast north of Bonita Beach to Tarpon Springs.

A TROPICAL STORM WATCH in in effect for: Cuban provinces of Matanzas, Cienfuegos,

The increase in speed could mean the the center of Isaac should be over the Florida Keys by mid-afternoon Sunday, most likely still as a tropical storm but possibly as a category 1 hurricane.

The storm could drop as much as 12 inches of rain across the Florida Keys and on South Florida.

Storm Surge across the southwest Florida coast will be 5-7 feet, while the southeast coast and the Keys will be 1-3 feet.

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Here’s how to use the CBS4 site to prepare for and monitor Isaac: