Hurricane Rosa recalls Arizona's jaw-dropping history of flash floods

Flash floods cover desert highway in California

Flash floods: How they form and who is at risk

Nature’s haunting masterpiece in motion. Facts about southwest flash floods: Flash floods can form in under 10 minutes after desert rain. 2. That “chocolate” color? It’s sandstone and mud in motion. 3. Southwest mesas channel rain into instant waterfalls. 4. These falls can vanish within hours after the storm. 5. Beautiful from afar — deadly up close. 6. Flash floods can sweep away cars and boulders. 7. The desert’s rare waterfalls are both art and warning. 8. Just one inch of rain can unleash a