Tropical Storm Roslyn is expected to strengthen into a hurricane when it makes landfall on Mexico's Pacific coast by Saturday night or Sunday morning.
Reuters quoted the U.S. National Hurricane Centre (NHC).
The storm, now some 290 km south-southwest of the Mexican port city Manzanillo, is predicted to follow the coast before turning inward near the famous resort town Puerto Vallarta, an NHC map shows.
The NHC said that the slow-moving storm is recording maximum sustained winds near 110 kph with higher gusts.
A Category 1 hurricane packs winds of at least 119 kph; however, the NHC forecasts that Roslyn will reach 169 kph as it nears Puerto Vallarta, making it a Category 2 before it dissipates inland.
The NHC also expects Roslyn to cause a dangerous storm surge, producing "significant coastal flooding" near and to the east of where the storm makes landfall, bringing "large, destructive waves."
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