At the time of landfall, the wind shear could pick up prompting debilitating of the system, however, it should still remain a strong and risky hurricane while moving inland late Tuesday and into Wednesday.
CITY-Hurricane Willa strengthened into a Category 5 storm with sustained winds up to 160 miles per hour Monday as it headed toward Mexico's western coast, where it is expected to make landfall as a major hurricane Tuesday.
Willa was about 225 miles (365 kilometers) south-southwest of Cabo Corrientes with maximum sustained winds of 140 mph (220 kph). Hurricane-force winds extend up to 25 miles from the centre of the storm.
Even at Category 4, Willa is "extremely dangeorus", forecasters warned, adding that it was likely to strengthen slightly into a Category 5 Monday morning.
Forecasters said Willa is expected to produce storm total rainfall accumulations of 6 to 12 inches, with local amounts up to 18 inches, across portions of western Jalisco, western Nayarit, and southern Sinaloa in Mexico.
It will then weaken slightly before making landfall but will still be a risky hurricane when it does hit.
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The U.S. National Hurricane Center says Willa could become a major hurricane by Monday morning and near the coast by Tuesday night.
The southwestern Mexican coast is warned to brace for unsafe storm surges which will impact on Tuesday. The rainfall could cause life-threatening flash flooding and landslides.
A Hurricane Watch is in effect for San Blas to Mazatlan meaning tropical-storm-force winds that make being outside anywhere from hard to unsafe could arrive within 48 hours.
A hurricane warning was posted for Mexico's western coast between San Blas and Mazatlan, including Las Islas Marias.
Farther to the south, Tropical Storm Vicente weakened but was still expected to produce heavy rainfall and flooding over parts of southern and southwestern Mexico.
Heavy rainfall will also cause unsafe conditions, as six to twelve inches are forecast to fall.