Hundreds of thousands of people across Puerto Rico are still waiting for water and power to be restored following Hurricane Fiona. Fiona was just a category 1 hurricane when it hit. But it moved slowly and dropped more than 30 inches of rain on some areas, and the flooding washed out roads, isolating some mountain communities.

Hurricane Fiona intensified into a powerful Category 4 early Wednesday as it headed in Bermuda's direction after lashing the Turks and Caicos Islands Tuesday. Fiona was packing sustained winds of 130 mph.

It's expected to approach Bermuda late Thursday, the U.S. National Hurricane Center said. The U.S. State Department issued an advisory Tuesday night telling U.S. citizens to "reconsider travel" to Bermuda.

Fiona was forecast to weaken before running into easternmost Canada over the weekend. It isn't expected to threaten the U.S. mainland.

When Hurricane Fiona struck Puerto Rico on Sept. 19, it damaged transmission lines and other power infrastructure, leaving more than a million people without electricity. The island’s electric grid has barely recovered from the catastrophic damage it suffered in 2017, when Hurricane Maria hit. Puerto Rico’s reliance on imported oil for electricity production is heavy, and the public utility is groaning under $8.2 billion in debt. As a result, Puerto Ricans have some of the most expensive and least reliable electricity in the US.

Hurricane Fiona blasted the Turks and Caicos Islands on Tuesday as a Category 3 storm after devastating Puerto Rico, where most people remained without electricity or running water. Hurricane conditions slammed Grand Turk, the small British territory's capital island, on Tuesday morning after the government imposed a curfew and urged people to flee flood-prone areas.

Hurricane Fiona is continuing its ruinous path Tuesday after devastating Puerto Rico with flooding rain then ripping through the Dominican Republic, where more than a million people were left without running water and dozens of homes were destroyed.

Nearly 800 people were brought to safety by emergency workers in the Dominican Republic, according to the country's emergency management director of operations, Juan Manuel Mendez. At least 519 people were taking refuge in the country's 29 shelters Monday, he said.

Hurricane Fiona made landfall in southwestern Puerto Rico on Sunday afternoon, as the entire island continues to reel from the knockout of its electricity grid.

Puerto Rico Gov. Pedro Pierluisi said the damage on the island is "catastrophic in many areas," calling it a "very delicate and sad situation." Heavy rainfall and catastrophic flooding was continuing across the island Sunday evening, according to the National Hurricane Center.

The Category 1 hurricane was predicted to produce dangerous landslides and heavy flooding on an already storm-battered island.

An intensifying Hurricane Fiona is bringing heavy rains and high winds to Puerto Rico, knocking out power to the entire island.

The latest: The eye of Fiona was approaching the coast of the Dominican Republic, near the town of Punta Cana, as heavy rainfall and "catastrophic flooding" continued across much of Puerto Rico, the National Hurricane Center tweeted early Monday.

Hurricane Fiona landed on Puerto Rico Sunday bringing with it strong wind gusts and rain that knocked out power for the whole island.

Luma, the private consortium that manages Puerto Rico’s electrical transmission and distribution system, said the situation on the island was “extremely dangerous and impeding our ability to evaluate the entire situation,” the Washington Post reported. The company added it could take several days to restore power and asked customers for “patience,” according to the Post.

Puerto Rico was without power as nightfall approached Sunday amid catastrophic flooding, hurricane force winds and the destruction of at least one bridge, five years nearly to the day after Hurricane Maria devastated the island.

Hurricane Fiona made landfall at 3:20 p.m. and quickly caused upheaval, with government officials saying they were prepared to evacuate residents of hard-hit areas.