Much of Hawaii remained under a flash flood warning Monday afternoon and evening after record rainfall as heavy as 11 inches in 24 hours slammed the island chain. The rain closed schools and damaged dozens of homes creating the threat of mandatory evacuations. Hilo on the Big Island and the states second-largest city received 10.82 inches of rain was on Sunday, breaking the 24-hour record by almost three and one-half inches. As many as 150 homes have been damaged in Hilo. As showers continued Monday, authorities warned of the potential for dangerous mudslides as hillsides became ever more waterlogged. No immediate relief from the heavy rain is expected.