Hurricane Roslyn is expected to cause a treacherous storm surge in parts of Mexico on Sunday after it slammed into the Pacific Ocean as a powerful Category 4 storm near the resort of Puerto Vallarta.

Early Sunday, the U.S. National Hurricane Center said Roslyn had become “extremely dangerous” with maximum sustained winds of 130 mph.

The storm was forecast to “bring damaging winds, life-threatening storm surge and flooding to parts of western and central Mexico today,” the hurricane center said at 12 a.m. Sunday.

The center located the core of​​​​Roslin about 45 miles west of Cabo Corrientes – a point of land jutting into the Pacific Ocean south of Puerto Vallarta – and moving north at 12 mph.

Forecasters said Roslyn was likely to pass near Cabo Corrientes and the Puerto Vallarta region overnight, but warned those areas would still experience strong winds, heavy rain and rough surf.

A hurricane warning was in effect from Las Ylos Marias and Playa Perul to Esquinapa. According to the center, a hurricane watch is in effect for the area north of Esquinapa to Mazatlán.

The storm was expected to make landfall in the state of Nayarit on Sunday morning. Hurricane Orlin made landfall on Oct. 3 a little further north in roughly the same region, about 45 miles southeast of Mazatlan.

Hurricane force winds extended 30 miles from the center of Roslyn, while tropical storm force winds extended 80 miles, according to the U.S. Hurricane Center.

A hurricane warning was issued for a stretch of coast from Playa Perula south of Cabo Corrientes north to El Roblito and the Marias Islands.

Seemingly oblivious to the approaching storm, tourists ate Saturday at beachside eateries around Puerto Vallarta and smaller resorts further north on the coast of Nayarit, where the storm was likely headed.

“We are fine. Everything is calm, everything is normal,” said Jaime Canton, a porter at the Casa Maria Hotel in Puerto Vallarta. He said that if the wind picked up, the hotel would gather furniture “so nothing would fly away.”

Although the skies were beginning to darken, the waves remained normal and few seemed to be in a rush to take precautions. Swimmers were still in the sea in Puerto Vallarta

“The place is full of tourists,” said Patricia Morales, a receptionist at Hotel Punta Guayabitas in the quiet beach town of the same name, further up the coast.

Asked what precautions were being taken, Morales said: “They (the authorities) have not told us anything.”

The Nayarit state government said the hurricane was expected to make landfall in the fishing village of San Blas, about 90 miles north of Puerto Vallarta.

The head of the state’s Civil Protection Office, Pedro Nunez, said: “We are now patrolling the cities to warn people so they can keep their belongings safe and stay safe in safer areas.”

In the neighboring state of Jalisco, Governor Enrique Alfaro wrote that 270 people had been evacuated in a city near the hurricane’s expected path and that five emergency shelters had been set up in Puerto Vallarta.

The National Water Commission said rains from Roslyn could cause mudslides and flooding. and the US hurricane center warned of a dangerous storm surge along the coast, as well as 4 to 6 inches of rain.