Tropical Storm Priscilla to Bring Heavy Rain and Flood Risk Across Southwestern US
Oct 10, 2025
Parts of the southwestern United States are bracing for torrential rains and potential flash floods as Tropical Storm Priscilla, though downgraded from a hurricane, continues to push inland after weakening over Mexico’s Baja California peninsula.
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Storm’s Remnants Still Pose Major Threat
Despite losing hurricane strength, Priscilla’s remnants carry significant moisture, and meteorologists warn that areas across Arizona, Utah, New Mexico, and Colorado could receive a year’s worth of rainfall in just a few hours.
Flood warnings were issued Thursday, with authorities urging residents to stay alert as the storm moves northward. The potential for flash floods, which can develop rapidly and turn deadly within minutes, remains extremely high.
“We don’t want to see people caught up in the hazards we are going to be seeing,” said Robert Rickey, meteorologist at the National Weather Service (NWS) in Flagstaff, Arizona.
Northern Arizona Faces Greatest Risk
Northern Arizona, particularly Flagstaff and surrounding regions near the Grand Canyon, is expected to face the heaviest rainfall, with 2 to 3 inches (5 to 8 cm) predicted — and possibly more in isolated areas.
Flagstaff usually receives around 2 feet (60 cm) of rain annually, but not typically in such short bursts. In contrast, southern Arizona and Phoenix average only 7–8 inches (18–20 cm) per year, meaning the sudden influx could overwhelm drainage systems.
Flash Flood Dangers in Desert Areas
Meteorologists warn that desert terrain and urban areas with poor drainage are especially vulnerable. Downpours can quickly transform dry canyons and city streets into dangerous flood zones.
Rickey said the NWS has been inundated with calls from hikers and outdoor enthusiasts asking whether to cancel trips.
“I had to have that kind of frank conversation with them,” he noted. “Is the risk worth the reward?”
Safety First: Avoid Flooded Roads
After extreme heat, flooding is the second-deadliest weather hazard in the United States, claiming 145 lives in 2024, many of them motorists attempting to cross flooded roads.
Arizona enforces a “stupid motorist law,” which allows authorities to fine drivers up to $2,000 if they ignore flood barricades and require rescue.
Experts urge residents to stay updated through official weather alerts and never attempt to drive or walk through floodwaters, no matter how shallow they may appear.
