Puerto Rican governor Ricardo Rosselló echoed the warning, saying: "If you are in a flood zone, your life is in danger". "We have not experienced an event of this magnitude in our modern history".
In its 8 a.m. advisory, the National Hurricane Center placed the center of the storm 15 miles south-southwest of San Juan and moving northwestward at 10 mph.
Puerto Rico is home to roughly 3.3 million people, a number of which took shelter from the storm in emergency shelters.More news: Russian military refutes rumors of journalists hit at Zapad-2017 exercise
"We were asking him to have more resources in terms of electrical teams that can help us out to solve the situation and recover the infrastructure of the power grid on the island".
Hurricane Irma destroyed homes and knocked down trees less than two weeks ago.
"It's just one after another", he said during a meeting with the king of Jordan at the United Nations in NY.
He expects the entire island to lose power and be in a blackout for days.More news: J&K: One killed, five injured as Pakistan violates ceasefire in Arnia Sector
"Without electricity, communications for a while with our family so that I worry about but I want to tell my family that I'll be OK", said Hernandez. Other than that, mostly sunny skies are expected through the weekend.
Dominica's internet service appeared to have gone completely offline by midday on Tuesday, according to Akamai Technologies, a company that tracks the status of the internet around the world. Maria made its first official landfall on the eastern Caribbean island of Dominica Monday night and, as of early Tuesday evening, is operating as a wicked Cat. "The winds are merciless!" "That is not going to happen because we are blessed, we're a blessed island and I think it's not going to happen as long as God is in front of it", said Chef Sio of Boricua Kitchen. We could see a few storms on Wednesday.
Hurricane Maria is the latest powerful storm of the hurricane season.
Airport group Guadeloupe Pole Caraibes said Guadeloupe's main global airport would be closed until at least 14:00 local time (1800 GMT) on Tuesday.More news: Alvarez, Golovkin poised to do battle for place in boxing history