Roslyn is expected to cause significant coastal flooding and damaging winds before making landfall on Sunday.
Hurricane Roslyn has strengthened into a Category 4 hurricane and is expected to strengthen as it reaches the Mexican coast, bringing with it strong winds, high tides and flash floods.
Maximum sustained winds increase to nearly 215kmph (130mph), and about 100-200mm (4-8 inches) of rain is forecast on the upper coast of Colima, Jalisco and western Nayarit.
The US National Hurricane Center (NHC) said preparations to protect lives and property “need urgent completion” for hurricane warning areas.
“Although some weakness may begin this evening, Roslyn is expected to remain near or at major hurricane intensity when it makes landfall on Sunday,” it said.
Officials in Nayarit, home to popular beach destinations such as Sayulita and Punta Mita, warned of flash floods and landslides caused by the storm.
“A dangerous high tide is expected to cause significant coastal flooding near and to the east of where the center makes landfall,” the NHC said.
Roslyn is forecast to make landfall near San Blas, a town with a population of about 40,000.
Usually every year between May and November, tropical cyclones make landfall in Mexico on both the Pacific and Atlantic coasts of the country.
In the May, AgathaThe first Pacific storm of the season, made landfall on the coast of Oaxaca state, killing 11 people.
In October 1997, Hurricane Pauline hit the Pacific coast of Mexico as a Category 4 hurricane, killing more than 200 people.
