A man and child watch strong swells on Bahoruco beach in Barahona, Dominican Republic, before the expected arrival of Tropical Storm Isaac. (Orlando Barria / EPA)
Meteorologists are tracking the storm Isaac as it approaches the U.S., where it could affect the Republican National Convention, which begins Monday in Tampa.
Children look out at the beach as Tropical Storm Isaac approaches in Barahona, Dominican Republic. (Ricardo Arduengo / Associated Press)
Strong swells hit Bahoruco beach, in Barahona, Dominican Republic, before the expected arrival of Tropical Storm Isaac. (Orlando Barria / EPA)
Volunteers move balloons that will be dropped from the ceiling of the Tampa Bay Times Forum in Tampa, Fla., during the Republican National Convention. Tropical Storm Isaac is threatening possible disruptions due to its proximity to the Florida peninsula. (Win McNamee / Getty Images)