Bomb cyclones to atmospheric rivers: what’s causing the California deluge?

Torrential rains are driving rivers of mud and debris in the Golden State – but what exactly is ailing the parched west?

More destructive downpours are in store for California next week as the sodden state continues to grapple with the effects of a very wet start to the year.

The torrential rains have caused rivers and streams to overflow, sent cascades down street and highways, and submerged vehicles, homes, and businesses. Strong storms whipped waves to historic heights along the California coast, which was also pelted with wind-strewn debris and tossed trees. Tens of thousands lost power during the storm siege and six fatalities have been confirmed in the onslaught.