Flash Flooding Triggers Evacuations Across U.S. Southwest; Pagosa Springs Faces Catastrophic Flood Warning

Mountain communities in San Bernardino County are preparing for flooding and mudslides after Wrightwood was hit hard in winter 2025.

Flash flooding has escalated across the U.S. Southwest, prompting mandatory evacuation orders in multiple areas. In Colorado, officials in Pagosa Springs issued a dire warning Sunday of potentially catastrophic flooding, with the San Juan River forecast to crest at extremely high levels — underscoring the severity of the ongoing weather event. The flooding is part of a broader pattern of heavy rainfall striking the region, including San Bernardino County's mountain communities in California. Wrightwood, a mountain community in the San Gabriel Mountains, was struck by severe flooding during the winter 2025 rainstorms, and that experience has been driving preparation efforts across the county ahead of anticipated El Niño conditions. The National Weather Service had issued flash flood warnings for already-saturated areas of the Southwest ahead of the weekend, with heavy rains expected from Saturday evening through Monday and forecasts of up to 4 inches (10 centimeters) of rainfall across the region. The Southwest had already been struck by multiple weather systems this autumn, leaving soils saturated and drainage systems under stress — conditions that dramatically amplify flash flood risk when additional rainfall arrives. El Niño refers to a periodic warming of Pacific Ocean surface temperatures that tends to shift storm tracks southward, delivering heavier-than-average rainfall to California and the broader Southwest. When rain falls on mountain terrain — particularly areas with fire-scarred or unstable soil — the risk of mudslides increases significantly alongside flooding. The preparations unfolding across San Bernardino County reflect lessons from recent winters and awareness that El Niño seasons can compress significant rainfall into short windows, overwhelming infrastructure and natural drainage systems quickly.

Why it matters

Mountain communities in San Bernardino County face heightened risk during El Niño years, when concentrated rainfall can rapidly trigger flooding and mudslides in steep terrain. Wrightwood's 2025 flooding illustrates how quickly conditions can become dangerous for residents in these areas.

What's next

Watch for specific county or local agency preparedness measures and any updated El Niño forecasts from the National Weather Service as the season approaches.

Key facts

Bias & framing notes

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