Hurricane Polo Stalls Off Mexico's Coast as One of the Strongest Pacific Storms on Record

Hurricane Polo, one of the most intense storms ever recorded in the Eastern Pacific, was stalled off Mexico's southwestern coast on Thursday, oscillating between Category 4 and Category 5 strength as it dumped torrential rain on Guerrero, Michoacán and Colima without making landfall. No deaths had been reported by Thursday evening, but the storm forced the closure of ports, the suspension of classes for hundreds of thousands of students and the opening of dozens of shelters along a stretch of coastline still scarred by Hurricane Otis, which the National Hurricane Center's official report attributed to at least 52 deaths in and around Acapulco in 2023.

As of 3 p.m. CST Thursday, the U.S. National Hurricane Center's afternoon advisory placed Polo about 155 miles south-southwest of Manzanillo, Colima, with maximum sustained winds of 150 mph and a central pressure of 935 millibars, moving west-northwest at just 10 mph. Forecasters said no coastal watches or warnings were in effect, though the core of the storm was expected to swing away from the Mexican mainland through the evening before curving toward the Baja California peninsula this weekend.

The Numbers

Polo's peak came Tuesday, when its winds reached 180 mph and its central pressure bottomed out near 892 millibars, according to reporting on National Hurricane Center data. That made it, by barometric pressure, the second-most intense hurricane ever recorded in the Eastern Pacific, trailing only 2015's Hurricane Patricia. The storm intensified from a 45 mph tropical storm to a 150 mph major hurricane in roughly 24 hours, one of the fastest such jumps on record for the basin.

• Peak intensity: 180 mph winds, 892 mb pressure (Tuesday, Sept. 22)
• Current intensity: 150 mph winds, 935 mb pressure (3 p.m. CST Thursday, Sept. 24)
• Rainfall: 150–250 mm (6–10 inches) forecast for coastal Guerrero and Michoacán, with isolated totals near 300 mm
• Shelters: 64 opened in Guerrero, 38 more in Jalisco

Mexico's National Water Commission warned Wednesday that the storm's bands would produce torrential rain of 150 to 250 millimeters across coastal Michoacán and Guerrero, with waves of six to eight meters battering the coastline of three states, raising the risk of mudslides and swollen rivers well beyond the storm's own footprint.

How Polo Intensified So Fast

Polo formed as a tropical depression on Sept. 20 and needed barely 48 hours to become a Category 5 hurricane, feeding on unusually warm water in a Pacific basin primed by an active El Niño pattern. Meteorologists have increasingly flagged this kind of rapid intensification — storms gaining major-hurricane strength within a single day — as a hallmark of recent Eastern Pacific seasons, following 2023's Hurricane Otis, which exploded from a tropical storm into a Category 5 in less than 24 hours before devastating Acapulco. Polo's own eyewall went through at least one replacement cycle this week, a process in which an outer ring of thunderstorms chokes off the original eye and briefly weakens the storm before it can restrengthen, which the Hurricane Center's forecasters said could push Polo back to Category 5 by Friday morning even as it pulls away from Mexico's coast.

Who Is in the Storm's Path

The heaviest effects so far have fallen on Guerrero's Costa Grande and Costa Chica, where waves reported at seven to eight meters in Zihuatanejo and Acapulco swamped waterfront restaurants and piers, and rain-swollen streets stranded vehicles. In Michoacán's Playa Azul, storm surge tore through beachfront palapas and dragged sand and debris into commercial streets, though officials said homes built with solid materials escaped structural damage. Acapulco's municipal government sent civil protection crews door to door in low-lying neighborhoods including Barra Vieja, El Revolcadero and Alfredo V. Bonfil, while classes remained suspended in five of Guerrero's eight educational regions and at the state's largest public university.

Mexico's navy shut the ports of Acapulco and Zihuatanejo to all vessel traffic and restricted smaller boats from ports in Colima, Michoacán and Oaxaca, citing swells capable of capsizing vessels and fog that was cutting visibility at sea, according to a bulletin cited by Mexican news outlets. Coastal communities in Baja California Sur, still largely untouched, were told to watch the storm's track closely as it is projected to approach the peninsula in the coming days, and seventeen flights were delayed at the airport in Los Cabos as airlines adjusted schedules in anticipation.

Mexico's Response

The federal government activated its Plan DN-III-E disaster-response protocol across six states — Oaxaca, Guerrero, Michoacán, Colima, Jalisco and Nayarit — putting army, air force and National Guard units on standby for evacuations, search and rescue, and debris clearance. Guerrero's state civil protection agency said it had completed preventive sweeps of coastal neighborhoods and rural routes leading into Acapulco, and kept an emergency hotline open around the clock.

Governor Evelyn Salgado Pineda, whose state bore the brunt of Otis two years ago, has repeatedly invoked that storm in appealing for calm rather than panic, telling reporters Wednesday that the earlier disaster remained "an experience that marked us" and committed the government to sustaining a culture of civil protection.

"Les pedimos estar muy atentos, mantener la calma y no hacer caso a noticias falsas" — "We ask people to stay very alert, remain calm and not pay attention to fake news."

Salgado's remarks, reported by regional outlets, echoed appeals from municipal officials asking residents to rely only on official forecasts rather than rumors circulating on social media.

What Happens Next

Forecasters expect Polo to track westward and then west-northwestward through the weekend, keeping its most powerful winds offshore but continuing to lash the coast with rain, surf and rip currents through Friday. Forecasters have warned of life-threatening flooding and landslides in areas of steep terrain even as the core stays over open water, and Mexican authorities have deployed roughly 15,000 security personnel along the coast as a precaution. Beyond that, the official outlook calls for gradual weakening as increasing wind shear erodes the storm before any potential approach to the Baja California peninsula and northwestern mainland Mexico late next week — a track that would put Polo's remnants, and whatever moisture they carry, on a path toward the U.S. Southwest. For now, the immediate question for coastal Guerrero, Michoacán and Colima is whether the rain bands still lashing their coastlines continue to recede, or whether a storm that has already twice reached Category 5 finds one more burst of strength before it finally moves on.