Hurricane Isaac strengthens, Tropical Storm Joyce forms in the Atlantic Ocean

The busy Atlantic hurricane season continued Friday with Isaac strengthening into a category 1 storm in the open waters of the Atlantic Ocean. Forecasters said the storm could cause dangerous waves in the Azores.

Meanwhile, Tropical Storm Joyce formed and is not threatening land.

Isaac was about 1,080 miles west of the Azores, with maximum sustained winds of 75 mph. It was heading east-northeast at 18 mph. Forecasters said Isaac is expected to strengthen before gradually weakening by the end of the weekend.