Hurricane Polo strengthens off Mexico Pacific coast with Category 5 winds forecast

Storm formation and current trajectory

On Monday, 21 September 2026, tropical storm Polo strengthened into a Category 1 hurricane over the Pacific Ocean off Mexico's southwestern coast. At 12:00 local time (18:00 GMT), the National Hurricane Center and Mexico's National Water Commission (Conagua) located the center of the storm approximately 305 kilometers south-southwest of Zihuatanejo, Guerrero, and 435 kilometers south-southeast of the port city of Manzanillo, Colima. The hurricane packed maximum sustained winds of 130 kilometers per hour (80 mph), with recorded gusts reaching 155 kilometers per hour. Moving eastward at a slow pace of seven kilometers per hour, Polo is expected to alter course by Tuesday night, executing a sharp turn toward the west-northwest or northwest. Although meteorological models indicate the storm's eye will remain offshore, its expansive circulation is set to pass close to the coasts of Guerrero, Michoacán, Colima, and Jalisco.

Projections for rapid intensification

Meteorological agencies warn that Polo is undergoing rapid intensification as it gathers strength over warm Pacific waters. The US National Hurricane Center expects the system to develop into a Category 3 storm or higher by Tuesday, reaching Category 4 strength with sustained winds near 222 kilometers per hour. Between Wednesday and Thursday, forecasts project wind speeds could climb to 259 kilometers per hour, matching Category 5 intensity on the Saffir-Simpson scale. This trajectory represents the highest hurricane strength modeled in the region since Hurricane Otis struck Guerrero in October 2023. Private forecasting service AccuWeather noted that the storm's outer bands could affect tourist centers such as Acapulco, Puerto Vallarta, and Guadalajara, while southern Baja California Sur, including Los Cabos, faces rough seas later in the week.

Rainfall, marine hazards, and alerts

Mexico's National Meteorological Service (SMN) and the NHC established a tropical storm watch extending from Tecpan de Galeana in Guerrero to Punta San Telmo in Michoacán. Coastal areas in Guerrero and Michoacán are forecast to receive between 10 and 20 centimeters (4 to 8 inches) of rain through Thursday, with isolated peaks reaching up to 30 centimeters (12 inches). The SMN projected 75 to 150 millimeters of rain across southern Guerrero and Oaxaca, 50 to 75 millimeters in coastal Michoacán, and 25 to 50 millimeters in eastern Jalisco and Colima. Conagua cautioned that the heavy downpours threaten to trigger landslides in mountainous terrain, swell river basins, and cause widespread flooding in low-lying zones. Ocean conditions are also deteriorating, with wave heights expected to reach two to four meters along the coasts of Guerrero and Michoacán, and up to 2.5 meters in Oaxaca.

Emergency precautions and broader conditions

In response to the deteriorating weather, Guerrero Civil Protection authorities suspended school classes in Acapulco, Costa Chica, and Costa Grande. Governor Evelyn Salgado Pineda emphasized the need for preventive measures to protect coastal communities from potential flooding and mudslides. The atmospheric influence of the storm extends well beyond Mexico's coastline, with AccuWeather warning that tropical moisture drawn northward will increase the risk of flash flooding across parts of the southwestern United States later in the week. Meanwhile, the heightened storm activity in the Pacific contrasts with the Atlantic basin, where the US National Oceanic and Atmospheric Administration (NOAA) recorded zero hurricanes through late September 2026. NOAA attributed this unusually calm Atlantic season, unmatched since satellite records began in 1966, to prevailing atmospheric disruptions caused by a strong El Niño event.