.FOR CALIFORNIANS it thought that familiarity. Last year a ceremony of tornados, fuelled by atmospheric waterways, eliminated at the very least 21 individuals and also created virtually $5bn-worth of harm around the state. On February fourth this year the very same kind of storm again ravaged. Hurricane-strength winds buffeted the core coast near Big Sur. In Los Angeles personalities were soaked as they arrived at the Grammy awards' red carpet. Estates in the Hollywood Hillsides were covered in dirt. A minimum of three individuals have actually passed away. What are actually atmospheric waterways, and also are they a danger beyond The golden state?