Weather tracker: Flash floods and landslides wreak havoc in California

<p>Two-year-old boy dies and homes buried as remnants of Tropical Storm Mario bring downpours and thunder</p><p>Flash flooding and landslides led to the <a href="https://www.theguardian.com/us-news/2025/sep/20/two-year-old-drowns-california-mudslides">death of a two-year-old boy</a> in California in the US last week, after heavy rainfall followed on the heels of Tropical Storm Mario further south. The storm skirted the Pacific coast of Mexico with minimal disruption, eventually dissipating to the west of Baja California on Tuesday, but the remnants went on to cause havoc on Thursday. Residual moist air from the tropical storm was drawn north-east towards California, bringing heavy downpours and thunder to central and southern counties.</p><p>The heaviest rainfall was in the mountains of Riverside and San Bernardino counties, where up to 68mm (2.67in) fell in a few hours. Further north, Death Valley – famously one of the driest places on Earth – received 15mm of rain, triple the average rainfall for September and a full quarter of the yearly average.</p> <a href="https://www.theguardian.com/environment/2025/sep/22/weather-tracker-flash-floods-landslides-havoc-california">Continue reading...</a>