After the deadly Lake Tahoe boat accident, here's what to know about sudden changes in Sierra weather, whether you’re hiking, ...

Scientists and officials say they need to figure out why the famed alpine lake isn't improving despite decades and billions ...

An 18-year study reveals dramatic year-to-year variations in ultraviolet radiation penetration tied to Sierra Nevada ...

Mountain storms can change quickly. Here’s a breakdown of the weather event that caused tragedy over the weekend.