Tropical Storm Igor's winds were blowing at 70 mph (110 kph) and strengthening Saturday, and the storm was likely to reach hurricane strength before the night is over, the National Hurricane Center said.

At 10 a.m. ET, Igor was about 1,470 miles (2,365 km) east of the Leeward Islands, headed west at 20 mph (32 kph), the center in Miami, Florida, said. The storm has the potential to reach Category 4 strength, forecasters said, but it isn't expected to reach the islands of the Caribbean sea for several days.