Escalation: National Weather Service warns of U.S. flash floods

Hurricane Polo made landfall early Tuesday in Baja California, Mexico, near Las Barrancas with maximum sustained winds around 110 mph. As the storm moves across Mexico, heavy rain will spread into the United States, putting more than 30 million people from Arizona to Iowa at risk of flash flooding.

Heavy rain tied to Polo has already flooded roads in southern New Mexico, trapping drivers in their cars until waters receded. The rain is expected to persist as the system moves through the region after landfall.

AI-synthesized from multiple reported sources