Hurricane Roslyn grew into a major Category 4 storm on Saturday as it headed for a collision with Mexico’s Pacific coast, likely north of the resort of Puerto Vallarta.

Roslyn’s maximum sustained winds reached 130 mph early Saturday, and it is expected to strengthen further, the U.S. National Hurricane Center said. The storm was centered about 170 miles south-southwest of Cabo Corrientes — the point of land jutting into the Pacific south of Puerto Vallarta — and moving north-northwest at 8 mph.

“On the forecast track, the center of Roslyn will move parallel to the southwestern coast of Mexico through midday today, then approach the coast of west-central Mexico, likely making landfall along the coast of the Mexican state of Nayarit Sunday morning,” the hurricane center said early Saturday.

“Although some weakening is possible beginning tonight, Roslyn is expected to still be near or at major hurricane strength when it makes landfall on Sunday,” it said.

The National Water Commission said rains from Roslyn could cause mudslides and flooding. and the U.S. hurricane center warned of dangerous storm surge along the coast, as well as 4 to 6 inches (10 to 15 centimeters) of rain..

Jalisco state Gov. Enrique Alfaro said on Twitter that any school activities in the region would be cancelled Saturday and he urged people to avoid touristic activities at beaches and in mountainous areas over the weekend.