Key Takeaways
- Hurricane Polo intensified to category 5 in just over 24 hours, reaching maximum winds of 285 km/h (180 mph).
- The storm’s rapid growth was fueled by warm ocean temperatures and favorable atmospheric conditions.
- Forecasts indicate Polo will remain over the Pacific, potentially approaching Baja California next week.
Hurricane Polo’s Rapid Intensification
Hurricane Polo first emerged as a tropical disturbance off Mexico’s Pacific coast in mid-September 2026. By September 20, it was classified as a tropical depression, and it quickly escalated to a tropical storm the next day. Meteorologists characterized the storm’s rapid intensification as “jaw-dropping” and “astonishing.”
Gary Partyka, an atmospheric scientist at NASA, described the storm’s growth as “explosively rapid,” fueled by conditions ideal for strengthening, such as low wind shear, high moisture, warm ocean temperatures, and significant atmospheric instability. By September 22, Polo reached category 5 strength, with winds increasing by an astonishing 90 knots (167 km/h) within 24 hours. The National Hurricane Center noted this intensification as “truly remarkable.”
NOAA’s Hurricane Hunter aircraft recorded winds nearing 285 km/h (180 mph), making Polo the third-strongest storm in recorded history for the eastern Pacific. On the afternoon of September 23, satellite imagery captured Polo as a category 4 storm with sustained winds of 230 km/h (145 mph), following an eyewall replacement cycle that slightly weakened it.
Kristen Corbosiero, an atmospheric scientist at SUNY Albany, noted that the satellite imagery showcased Polo’s large, defined eye and impressive outflow pattern, bolstered by weak upper winds. The hurricane was over unusually warm waters, with sea surface temperatures as high as 32 degrees Celsius (90 degrees Fahrenheit), 2-3 degrees above September averages. High ocean heat content at deeper layers also helped sustain Polo’s strength.
While some attributes of Polo’s rapid intensification might suggest a link to the ongoing El Niño conditions, experts cautioned against attributing its development solely to these factors. Rapid intensification has occurred in past years under various climate conditions, such as La Niña. However, overall tropical cyclone activity in the eastern Pacific generally increases during El Niño years due to shifts in ocean and atmospheric patterns. By September 24, cyclone energy levels in the region had nearly doubled the norm for this time of year.
NASA’s Worldview browser and other tools provide real-time tracking of sea surface temperatures and storm data for those monitoring Hurricane Polo’s progress. Weather forecasts suggest Polo will remain over the Pacific until next week when it may shift northeast toward Baja California.
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