ORLANDO, Fla. -

Tropical Depression Alberto is expected to stay well offshore as it moves up the Atlantic.

Alberto's maximum sustained winds early Tuesday are near 35 mph (55 kph). Additional weakening is expected and the U.S. National Hurricane Center in Miami says Alberto could dissipate Thursday.

Alberto is centered about 340 miles (550 kilometers) south of Norfolk, Va., and is moving northeast near 15 mph (24 kph).

Meanwhile in the Pacific, Tropical Storm Bud's maximum sustained winds have increased to near 40 mph (65 kph). Additional strengthening is expected and Bud could become a hurricane by Wednesday night.

Bud is centered about 515 miles (825 kilometers) south of Zihuatanejo, Mexico, and is moving west-northwest near 12 mph (19 kph).