Hurricane Otis slammed into the southern Pacific coast of Mexico as a catastrophic Category 5 hurricane early Wednesday, bringing dangerous winds and torrential rains to Acapulco and nearby cities, awakening memories of the 1997 storm that claimed dozens of lives.

The hurricane, now downgraded to Category 4, is expected to rapidly weaken as it moves into the steep mountains of the state of Guerrero. However, the predicted rainfall of five to 10 inches, with some areas receiving up to 15 inches, has heightened the threat of landslides and flooding.

Otis was located about 25 miles north-northwest of Acapulco, with maximum sustained winds decreasing to 130 mph (215 km/h), moving at a speed of 10 mph (17 km/h). It is expected that by Wednesday evening, Otis' center will move further inland over southern Mexico.

Otis rapidly intensified, going from a tropical storm to a Category 5 hurricane in just 12 hours on Tuesday. Residents of Guerrero's coast scrambled to prepare, but the sudden strength of the storm caught many off guard.

"We are in maximum readiness," said Acapulco Mayor Abelina Lopez on Tuesday evening, urging residents to stay home or seek shelter in the city.

According to Lopez, "Otis" is stronger than Hurricane "Pauline," which struck Acapulco in 1997. Pauline devastated parts of the city and claimed over 200 lives, with hundreds more injured due to flooding and landslides.

Between the world-famous resorts of Acapulco and Zihuatanejo lie two dozen small towns and villages nestled between the mountains and the ocean.

Otis' arrival comes just days after Hurricane Norma hit the southern tip of the Baja California Peninsula in Mexico to the north.

Acapulco is a city with a population of over 1 million people, situated at the base of steep mountains. Luxury homes and slums cover the hillsides overlooking the sparkling Pacific Ocean.

Guerrero is one of the poorest and most violent states in Mexico. Just on Monday, the local police chief and 12 officers were killed and found on a highway in El Papayo, located in the Guerrero village of Coyuca de Benitez, not far from Otis' impact area.

In the Atlantic, Hurricane "Tammy" continued to move northeast over open waters with winds of 85 mph (140 km/h) after passing through the Lesser Antilles over the weekend. Tammy was located approximately 570 miles (915 kilometers) southeast of the Bermuda Islands. According to the National Hurricane Center, it is expected to become a powerful extratropical cyclone by Thursday.