Why Is the Pacific Hurricane Season So Extreme This Year?
The Pacific basin is buzzing with intense tropical activity as September ends, featuring powerful hurricanes Polo and Nolo, and developing Tropical Storm Rachel. Hurricane Polo poses an immediate, life-threatening danger to Baja California, bringing destructive winds and severe flash flooding. This unusual flurry of activity in the Pacific stands in stark contrast to an exceptionally quiet Atlantic season, highlighting a dramatic shift in global weather patterns that demands our attention and preparedness in a changing climate.
Hurricane Polo, a formidable Category 3 storm, is making a rare and dangerous approach to Baja California. With sustained winds near 115 mph (185 km/h), it's set to bring life-threatening hurricane-force winds and flash flooding across Baja California Sur and Sonora, Mexico. This intensity for a Baja landfall is highly unusual, potentially rivaling historic storms like Odile (2014) and Olivia (1967) which caused significant damage and loss of life. Already, Polo is linked to two deaths in Mexico, underscoring the immediate danger.
Even as Polo weakens over land, its deep tropical moisture will be carried far inland by steering currents. This means torrential rains and dangerous flash flooding are expected to extend across the Southwest U.S. deserts and mountains later this week. Additional heavy rains are forecast for the Southern and Central Plains, fueled by Gulf of Mexico moisture, intensifying the risk of widespread flooding across a vast region.
Further west, Hurricane Nolo remains an extremely powerful Category 4 storm, approaching Category 5 strength southwest of Hawaii. While not directly threatening the populated islands, its immense size means significant marine impacts extend far from its center. Meanwhile, Tropical Storm Rachel is gathering strength south of Mexico and is expected to become a hurricane soon. It will likely bring more rounds of heavy rainfall to coastal areas of Guerrero and Michoacan, regions already saturated by Polo's intense downpours, increasing the risk of compounded disaster.
This year’s tropical cyclone activity presents a striking contrast: the Northeast Pacific is experiencing its most active season on record since 1991, with accumulated cyclone energy (ACE) over 150% of the average. Conversely, the Atlantic is seeing its lowest ACE levels since 1966, at less than 15% of its average to date. This dramatic divergence highlights the unpredictable and often intense nature of global weather systems, emphasizing the urgent need for communities worldwide to adapt and prepare for increasingly extreme weather events linked to a warming climate.