After dissipating over Mexico's mountainous terrain, the remnant upper-level energy and moisture from Willa will eventually enhance rainfall in Texas and perhaps the northern Gulf Coast Wednesday into Thursday.
The Hurricane Center said that large storm swells off the coast are also "likely to cause life-threatening surf and rip current conditions".
Mexican authorities are rushing to evacuate low-lying areas and set up shelters as an "extremely dangerous" Hurricane Willa with winds of 145 miles per hour (230 kph) heads toward a Tuesday afternoon landfall along a stretch of Pacific coast dotted with high-rise resorts, surfing beaches, and fishing villages.
The US National Hurricane Centre said that the eye of the unsafe Category three storm was about to make landfall, and little variation in strength was expected beforehand.
There were no immediate reports of deaths or missing people, but the storm's 120 miles per hour (195 kph) winds damaged a hospital, knocked out power, toppled wood-shack homes and ripped metal roofing off other houses in the Sinaloa state municipality of Escuinapa when it came ashore Tuesday evening.
Mexican weather authorities said those two states and Durango and Jalisco were going to have torrential downpours.
The storm's core was hitting a stretch of coast about 80km south of Mazatlan, a resort city that is home to high-rise hotels and about 500,000 people, including many U.S. and Canadian expatriates.
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After landfall, Willa is expected to weaken quickly as it runs into the mountains, and it will be a rainmaker by the time it crosses the US-Mexico border Wednesday. There could be life-threatening flash floods and mudslides. A decree of "extraordinary emergency" was issued for 19 municipalities in Nayarit and Sinaloa states, the federal Interior Department announced.
Willa has been a danger for forecasters as well.
It was due to weaken fast as it moved inland, the National Hurricane Center (NHC) said. "This would bring significant amounts of rain and wind Saturday and Sunday in cities like Washington, D.C., Philadelphia, New York City and Boston".
Southwest Airlines canceled all flights at Puerto Vallarta's worldwide airport.
The storm is churning in the warm waters of the Gulf Coast, partially fueled by monster storm Hurricane Willa, and is expected to reach its full, frightening potential once it hits the Carolina coastline. American Airlines canceled all flights from Mazatlan.
The back-to-back systems of Willa and Vicente have helped make the 2018 hurricane season in the northeast Pacific one for the record books. The ocean waters off Mexico's western coast are running 1 to 2 degrees Fahrenheit above average for late October.