Hurricane Roslyn strengthened into a severe Category 4 storm on Saturday as it approached Mexico’s Pacific coast, the US National Hurricane Center said, warning of potentially damaging winds, dangerous storm surges and flash floods.

The storm was about 150 miles (240 kilometers) west-southwest of Manzanillo with maximum sustained winds of 130 miles per hour and is expected to hit the coast of Nayarit state on Sunday at or near the strength of a major hurricane, the NHC said at 1500 GMT -Update.

“An additional reinforcement is forecast for today. Although some weakening is possible as of tonight, Roslyn is still expected to be near or at the strength of a major hurricane when it makes landfall on Sunday,” the NHC said.

“On the forecast route, the center of Roslyn will be moving parallel to the southwest coast of Mexico by noon today, then approaching the coast of west-central Mexico and likely making landfall along the coast of Mexico’s Nayarit state by Sunday morning.”

The NHC warned of flash flooding and landslides caused by the storm.

“A dangerous storm surge near and east of the center landfall is expected to cause significant coastal flooding,” it said.

Authorities have issued a precautionary alert in the Pacific coastal states of Jalisco, Colima, Nayarit and Sinaloa.

Tropical cyclones hit Mexico on both the Pacific and Atlantic coasts each year, usually between May and November.

In October 1997, Hurricane Pauline hit the Pacific coast of Mexico as a Category 4 storm, killing more than 200 people.