One storm weakens, another strengthens in Atlantic

MIAMI, Florida (Reuters) -- As Hurricane Isaac weakened, Tropical Storm Joyce strengthened and forecasters said it could be a hurricane in a day or two.

Isaac was losing power and posed no threat to land, Eric Blake, a forecaster at the National Hurricane Center in Miami, said.

CURRENT ISAAC INFO Click here for the latest Isaac information     CURRENT JOYCE INFO Click here for the latest Joyce information

At 11 a.m. EDT, Joyce -- with winds of 65 mph (100 km/h) -- was located at 11.8 north latitude, 36.5 west longitude or about 1,555 miles, 2,500 km east of the Windward Islands. The storm was moving towards to the west near 12 mph (19 km/h) and was expected to continue that movement through Wednesday.

Tropical-storm force winds extended 60 miles (95 km) from Joyce's center.

"The Caribbean islands should monitor it but it's still a long ways away -- six days if it moves at its current speed," he said.

At 11 a.m. EDT, Isaac was located near 20.1 north latitude, 46.2 west longitude or 1,020 miles (1.640 km) east of the Northern Leeward Islands. With winds near 90 mph (150 km/h), Isaac was moving toward the west-norhtwest near 13 mph (20 km/h) and was expected to continue the same motion for the next 24 hours. Hurricane-force winds extended outward upto 30 miles (45 km) from the center. Tropical-storm force winds extended upto 140 miles (220 km) from the center.

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