Havana, Cuba - Tropical Storm Fiona headed for Puerto Rico on Saturday, with forecasters warning it likely would grow into a hurricane before hitting on Sunday with extremely heavy rains with the potential to cause landslides, severe flooding and power outages.

The storm lashed several eastern Caribbean islands, with one death reported in the French territory of Guadeloupe. Regional prefect Alexandre Rochatte said the body was found on a roadside after a home washed away in the capital of Basse-Terre. More than 20 other people were rescued amid high winds and heavy rain that left 13,000 customers without power, with the storm tearing up roads, downing trees and destroying at least one bridge.

Fiona was centered 120 kilometers south of St. Croix on Saturday evening with maximum sustained winds of 95 kph. It was moving west at 13 kph on a path forecast to pass near or over Puerto Rico on Sunday night. Fiona was expected to become a hurricane before reaching Puerto Rico's southern coast.

This satellite image provided by NOAA shows Tropical Storm Fiona in the Caribbean, Sept. 17, 2022.

'We are already starting to feel its effects,' Puerto Rico Gov. Pedro Pierluisi said at a news conference in which the lights briefly went out as he spoke, prompting groans and laughs across the island. 'We should not underestimate this storm.'

Officials said the expected heavy rains would be dangerous because the island's soil is already saturated.

'We're not saying that the winds aren't dangerous, but we are preparing for a historic event in terms of rain,' said Ernesto Morales, a forecaster with the National Weather Service in San Juan.

Many Puerto Ricans worried about serious power outages since the reconstruction of the island's power grid razed by Hurricane Maria in 2017 only recently began. The grid remains fragile and power outages occur daily.

Luma, the company that operates the transmission and distribution of power on the island, said it flew in an extra 100 workers ahead of the storm but warned of significant outages over the weekend.

Fiona was forecast to swipe past the Dominican Republic on Monday as a potential hurricane and then Haiti and the Turks and Caicos Islands with the threat of extreme rain.

Forecasters posted a hurricane watch for the U.S. Virgin Islands as well as the southern coast of the Dominican Republic from Cabo Engano westward to Cabo Caucedo and for the northern coast from Cabo Engano westward to Puerto Plata.

In Puerto Rico, authorities opened shelters and closed public beaches, casinos, theaters and museums as they urged people to remain indoors. Officials also transferred hundreds of endangered Puerto Rican parrots to their shelter.

'It's time to activate your emergency plan and contact and help your relatives, especially elderly adults who live alone,' said Dr. Gloria Amador, who runs a nonprofit health organization in central Puerto Rico.

The governor said an elderly man died shortly after arriving at a shelter in the tiny island of Culebra that lies just east of Puerto Rico. He said that the man was living in squalid conditions and that the mayor had been trying to relocate him.

Pierluisi said $550 million in emergency funds were available to deal with the storm's aftermath along with enough food to feed 200,000 people three meals a day for 20 days.

At least one cruise ship visit and several flights to the island were canceled, while authorities in the eastern Caribbean islands canceled school and banned aquatic sports as Fiona battered the region.

On Guadeloupe, authorities said they recorded wind gusts of up to 120 kph. They also said 23 centimeters of rain fell in three hours in the Gros Morne area.

Fiona, which is the Atlantic hurricane season's sixth named storm, was predicted to bring 13 to 25 centimeters of rain in eastern and southern Puerto Rico, with as much as 51 centimeters in isolated spots. Rains of 10 to 20 centimeters were forecast for the Dominican Republic, with up to 30 centimeters in places. Life-threatening surf also was possible from Fiona's winds, forecasters said.

Meanwhile, Tropical Storm Lester in the eastern Pacific dissipated Saturday afternoon after making landfall to the south of Acapulco on Mexico's southwestern coast.

The hurricane center said Lester's remnants could still drop from 20 to 31 centimeters of rain on the coasts of upper Guerrero state and Michoacan state, with isolated areas getting 41 centimeters.

Meanwhile, Tropical Storm Madeline formed deeper in the Pacific, but forecasters predicted it would not pose any threat to land as it moved farther out to sea.