Mexico has issued an alert for parts of its Pacific seaboard as it prepares for the "life-threatening" Hurricane Willa.
Willa is expected to make landfall on Mexico's west-central coast later on Tuesday and is "potentially catastrophic", forecasters say.
Currently a Category Three – out of five – storm, it threatens to bring torrential rains and major flooding.
Earlier this month areas of the US were devastated by Hurricane Michael, which left at least 27 people dead.
Willa is heading northwards with maximum sustained winds of about 205km/h (125mph), said the US National Hurricane Center (NHC).
It warned that the storm could cause "life-threatening flash flooding and landslides".
A hurricane warning is in effect for areas from San Blas to Mazatlan, including Las Islas Marias.
"While gradual weakening is forecast today [Tuesday], Willa is expected to be a dangerous major hurricane when it reaches the coast of Mexico," the NHC said.
It added that rapid weakening was expected after landfall on Tuesday night and continuing into Wednesday.
Hurricane Michael, which made landfall on 10 October, was the most powerful ever to hit north-west Florida.
Residents of Mexico Beach, one of the areas worst affected, described the aftermath as a "war zone".