Neighbors, volunteers dig out from thick volcanic mud after Hawaii floods

Hawaii’s worst flooding in 20 years damaged hundreds of homes, crops and infrastructure, forcing rescues and causing losses over $1 billion.

The worst flooding to hit Hawaii in two decades has swept homes off their foundations, floated cars out of driveways and left floors, walls and counters covered in thick, reddish volcanic mud.

Authorities said hundreds of homes had been damaged, along with some schools and a hospital. On Monday, new downpours set off a fresh round of flooding on Oahu's south side while residents on the island's North Shore cleaned up and assessed the destruction from last week's torrents.

No deaths have been reported, but more than 230 people had to be rescued. The National Weather Service said showers and thunderstorms were expected to wane but the Big Island remained under a flash flood watch.

Here's what to know about the heavy rains battering Hawaii:

Gov. Josh Green said the cost of the storm could top $1 billion, including damage to airports, schools, roads, homes and a Maui hospital in Kula. He called it the state’s most serious since flooding since 2004, when floods in Manoa inundated homes and a University of Hawaii library.