California Isn’t Ready for a Megaflood. Or the Loss of Daniel Swain.

By Liza Gross

Powerful storms drenched California last week, as massive rivers in the sky unleashed destructive downpours and winds that caused widespread flooding and mudslides, toppled trees that killed four people in Northern California, cut power to nearly 900,000 people statewide and dumped record-setting rainfall on Southern California, which is under a state of emergency.