Hurricane Polo has become one of the most powerful storms on Earth this year after exploding from a modest tropical storm into a Category 5 hurricane in just 24 hours off Mexico’s Pacific coast. As of Wednesday afternoon, September 23, the monster storm had eased slightly but was still menacing southwestern Mexico: forecasters warn its heavy rain could trigger life-threatening flooding and mudslides in the states of Guerrero and Michoacán, even though its destructive core is expected to remain offshore.
From 50 mph to 160 mph in just 24 hours
Polo was an unremarkable 50 mph tropical storm on Monday morning, September 21. By Tuesday morning it had reached 160 mph — full Category 5 strength — a 110 mph jump that the U.S. National Hurricane Center (NHC) described as “truly remarkable,” placing it among the fastest intensification episodes ever recorded in the Eastern Pacific, according to Signal Post News.
The storm kept strengthening through Tuesday. At 15:00 UTC on September 22 it carried maximum sustained winds of 165 mph (270 km/h), reported The Watchers citing NHC data. By Tuesday afternoon, Polo’s winds peaked at 180 mph with a central pressure of 892 hPa — tying two western Pacific super typhoons as the strongest storms on the planet so far in 2026.
NOAA/GOES-18 satellite imagery captured the hurricane’s textbook structure at peak intensity: a clear eye wrapped by a near-perfect spiral of cloud bands over the open Pacific.
Latest position: moving northwest, core forecast to stay offshore
By Wednesday morning, Polo had weakened slightly to a strong Category 4 hurricane with 150 mph winds, according to NHC Advisory 11A. The latest NHC Advisory 13, issued at 3:00 PM Central Time on Wednesday, put the storm at 145 mph with a minimum central pressure of 932 mb — located about 150 miles south-southwest of Zihuatanejo and 260 miles south-southeast of Manzanillo, moving northwest at 7 mph.
The NHC forecast calls for Polo to turn northwest and track roughly parallel to the Mexican coast through the end of the week. That is the cautiously encouraging news: the most destructive hurricane-force winds are forecast to remain over water. But forecasters stress that a near-shore track does not have to make landfall to be deadly — outer rainbands are already affecting the coast, as the Associated Press reported.
The real danger: torrential rain and mudslides
A Tropical Storm Warning is in effect from Tecpan de Galeana to Punta San Telmo, with a Tropical Storm Watch farther along the coast. Forecasters expect 4 to 8 inches (100–200 mm) of rain across coastal Guerrero and Michoacán, with isolated totals of up to 12 inches (300 mm) through Thursday, and smaller amounts in coastal Oaxaca, Colima and Jalisco.
That rainfall, dumped onto steep terrain, can produce life-threatening flooding and mudslides — the classic danger of near-miss Pacific hurricanes in this region. Mexican authorities have closed ports and suspended schools in exposed areas, while the country’s civil protection agency (CNPC) and national weather service (SMN) continue issuing guidance. WestJet has offered free rebooking for Puerto Vallarta flights scheduled September 23–25, a sign of how seriously airlines are taking the disruption risk, per travel reporting.
Why Polo grew so fast: a hot ocean and strong El Niño
Scientists link Polo’s explosive growth to very warm eastern Pacific sea-surface temperatures tied to a strong El Niño, and say the event underscores how warmer oceans are increasing the frequency and intensity of extreme rapid-intensification episodes, according to analysis by Particle.
The contrast with the Atlantic could hardly be sharper: no Atlantic hurricanes have formed yet in 2026, a record-long quiet start, with forecasters noting that this year’s El Niño tends to shear Atlantic storms apart before they can organize — while supercharging storms in the eastern Pacific.
Elsewhere in the Pacific
Polo is not the only storm the NHC is watching. Tropical Storm Odalys, far out at sea, carried 65 mph winds on Tuesday and was expected to become a hurricane by midweek, while the NHC also continued advisories for another system, Tropical Depression Fifteen-E, in the central Pacific. In the Atlantic, Tropical Storm Fay weakened to a 40 mph remnant low southwest of the Azores.
What to watch next
Residents along the Guerrero and Michoacán coasts should follow guidance from Mexico’s civil protection authorities and the SMN, keep emergency supplies ready, and avoid travel through flood-prone and steep terrain until the rain eases. Visitors to Pacific resort towns such as Zihuatanejo and Ixtapa should monitor official advisories and their airlines’ policies. For travelers planning future trips to Mexico — including football fans eyeing next summer’s World Cup matches involving Mexico — the storm is a reminder to check weather advisories ahead of any visit.
The NHC issues updated public advisories every six hours, and meteorologists will be watching closely to see whether Polo’s forecast track holds or shifts closer to the coastline. Either way, the rainfall threat is already locked in — and in southwestern Mexico, rain remains the deadliest part of a hurricane.
