MIAMI, Florida (CNN) -- Hurricane Fred quickly strengthened into a Category 2 storm early Wednesday, after initially reaching hurricane status six hours earlier, the National Hurricane Center reported.
"Some additional strengthening is forecast and Fred could become a major hurricane later today," forecasters said. "Weakening is expected to begin on Thursday."
Fred is the second hurricane of the Atlantic season, which runs through November 30.
In the Pacific, Tropical Storm Linda churned through open waters.
Neither storm was expected to make landfall before dissipating.
At 5 a.m. ET, Fred was packing winds of 105 mph (165 km/hr) -- up from 75 mph -- and was located about 500 miles (805 km) west-southwest of the southernmost Cape Verde Islands.
Fred was moving toward the west-northwest near 13 mph (20 km/hr). The storm was expected to turn toward the northwest and then the north-northwest over the next few days as its forward speed decreases.
A National Hurricane Center forecast map shows Fred becoming a tropical depression by Monday.
At 2 a.m. PT (5 a.m. ET), Linda was located about 1,300 miles (2,095 km) west-southwest of the southern tip of Baja California and was more than 1,700 miles (2,800 km) east of Hawaii.
The storm had maximum sustained winds near 65 mph (100 km/hr) and was drifting to the north-northwest at 2 mph (4 km/hr).
"Some additional strengthening is possible today," the hurricane center said. Linda is forecast to begin weakening on Thursday.