Fiona would then cross the Dominican Republic on Monday with the same threat of extreme rainfall in places that could cause flash flooding and mudslides.
The US National Hurricane Center in Miami said Fiona is likely to strengthen into a hurricane near the Bahamas Tuesday night.
Meanwhile, Tropical Storm Lester in the eastern Pacific Ocean was on a projected path that could make landfall Saturday evening near the Acapulco area on Mexico’s southwest coast.
Fiona was forecast to bring 10 to 20 centimeters of rain in eastern and south Puerto Rico, with as much as 30 centimeters in isolated spots. Rain was forecast from 15 to 25 centimeters (6 to 10 inches) for the Dominican Republic, with up to 16 inches (41 centimeters) in places. Life-threatening surf was also possible from Fiona’s winds, forecasters said.
Fiona, the sixth storm of the Atlantic hurricane season, had maximum sustained winds of about 60 mph (95 kph) late Friday, the center said. It was moving westward at a speed of 22 km/h and was about 90 kilometers west of Guadeloupe.
In the Pacific, Lester was expected to remain a tropical storm until it hit the Mexican coast, but forecasters warned of potential dangers from heavy rain.
The storm had maximum sustained winds of 40 mph (65 kph) at the end of Friday. It was centered 200 miles (325 kilometers) southeast of Acapulco and was moving northwest at 19 mph.
There was a tropical storm warning from Puerto Escondido to Zihuatanejo. The Hurricane Center said Lester could receive from 8 to 12 inches (20 to 30 centimeters) of rain on the coasts of upper Guerrero State and Michoacan State, with isolated areas reaching 16 inches (41 centimeters).