Tuesday, September 29, 2026

Polo Weakens as Its Moisture Fuels Flooding in the Southwest

Hurricane Polo, which became the third Category 5 hurricane of the Pacific season last week, made landfall late Monday night in Baja California Sur as a strong Category 2 storm with maximum sustained winds of 110 mph.

After crossing the Gulf of California, Polo came ashore again just east of Guaymas, Sonora, as a Category 1 hurricane, bringing flooding, power outages and fallen trees before weakening to a tropical storm inland. Before Polo reached Baja, the Santa Elena River in Jalisco overflowed and swept away a family's home in Talpa de Allende, killing both parents and two children. .

In the US, Polo and a jet-stream disturbance are pushing atmospheric moisture near or above record levels for late September across parts of the Southwest. Storms had already caused flash flooding Monday, prompting several water rescues in Bullhead City, Arizona. Flood watches covered about 28 million people early Tuesday, and Maricopa County sheriff's deputies performed several water rescues in and around Phoenix. Forecasters expect the threat to spread into the Plains and Midwest over the week.

 

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