MIAMI, Aug 23 (Reuters) - A tropical system north of Haiti and the Dominican Republic is expected to gather strength over the weekend as it moves over the warm open waters near the Bahamas, the National Hurricane Center (NHC) said.
Forecasters gave an 80 percent chance of it becoming a tropical depression in the next 48 hours and a 90 percent chance in the next five days.
"The environment that it's going to be moving into later today and the next day should be more favorable to it becoming a tropical depression or storm," said Michael Brennan, a NHC hurricane specialist.
On Friday, heavy rains and tropical storm force winds of about 40 miles per hour drenched Puerto Rico and Hispaniola.
Federal forecasters in August downgraded their outlook for the 2014 Atlantic hurricane season, predicting below normal activity with seven to 12 named storms, and no more than two expected to reach major hurricane status.
A major hurricane is considered to be Category 3 or above with winds hitting at least 111 miles per hour (178 km per hour).
A typical season has 12 named storms, with six hurricanes, and three becoming Category 3 storms.
In its August outlook, the agency said cooler than average temperatures in the tropical Atlantic Ocean would make it difficult for larger storms to develop.