In mid-September 2026, Hurricane Polo began as a tropical disturbance off the Pacific coast of Mexico. By September 20, it had organized enough to qualify as a tropical depression, and by the next day, it was classified as a tropical storm. The storm then entered a phase of rapid intensification, described by meteorologists as “jaw-dropping,” “astonishing,” and “absolute insanity.” Gary Partyka, an atmospheric scientist with NASA’s Global Modeling and Assimilation Office (GMAO), noted that Polo experienced “explosively rapid intensification.”
Conditions for Intensification
The environment surrounding Hurricane Polo was nearly ideal for strengthening, characterized by weak wind shear, high moisture, warmer ocean temperatures, and significant atmospheric instability. Observers noted that Polo underwent extreme rapid intensification, defined as an increase in wind speeds of at least 60 knots (111 kilometers or 69 miles per hour) within a 24-hour period. By September 22, the storm’s maximum sustained wind speed had risen by 90 knots (167 kilometers per hour or 104 miles per hour), reaching category 5 strength. The National Hurricane Center described this intensification as “truly remarkable.”
Record-Breaking Strength
On September 22, NOAA’s Hurricane Hunter aircraft estimated winds of nearly 285 kilometers (180 miles) per hour, making Polo the third-strongest storm on record in the eastern Pacific by maximum sustained winds. It also set a record for the fastest transition from a tropical depression to a category 5 storm. By September 23, when NASA’s Aqua satellite captured an image of Polo, the storm had maximum sustained winds of 230 kilometers (145 miles) per hour, indicating it had weakened slightly after undergoing an eyewall replacement cycle.
Sea Surface Temperatures and Storm Dynamics
Polo developed over areas where sea surface temperatures reached as high as 32 degrees Celsius (90 degrees Fahrenheit), which is 2 to 3 degrees warmer than usual for that time of year. The presence of warm water at greater depths likely contributed to the storm’s sustained intensity. Atmospheric scientists cautioned against attributing Polo’s rapid intensification solely to El Niño’s warm surface temperatures, noting that similar rapid intensifications have occurred during La Niña and neutral conditions in the past.
As of September 24, the accumulated cyclone energy in the eastern Pacific was nearly twice the norm, indicating an increase in tropical cyclone activity in the region. Forecasters expect Hurricane Polo to remain over the Pacific until the following week, when it may curve toward the northeast and approach Baja California.
For more detailed information, visit science.nasa.gov.
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