( CNN ) -- Severely soggy weather soaked the East Coast to the West over the weekend , stranding travelers , washing out roads and claiming two lives . And while the U.S. mainland cleared , Hawaii braced Monday for Tropical Storm Flossie , as the weakening , but still potent system closed on the island chain . Life-threatening flash floods and mud slides are forecast as the storm threatens to dump up to 15 inches of rain , the National Hurricane Center said . On the mainland . In North Carolina , flood waters washed away two people in the state 's Piedmont region . The drownings happened Saturday after 4 inches of rain fell over five hours , prompting officials to declare a state of emergency in Catawba County . Delilah Lovett , 10 , of Charlotte and Juan Alberdi , 48 , of Huntersville -- members of different families who were visiting the area together -- were both swimming in what is known as the `` bathtub '' on Wilson 's Creek in Caldwell County around 6:15 p.m. , the Caldwell County Sheriff 's Office said . Rain , which had already stopped , raised Wilson Creek 2 feet above normal levels and created `` very swift currents '' and carried them away , according to a statement from the sheriff 's department . Kayakers found Delilah 's body nearly an hour after she disappeared , it said . Search and rescue crews found Alberdi on Sunday , about a quarter mile north of where they were first told he went into the water , according to LouAnne Kincaid , a spokeswoman for Caldwell County . In Lincoln County , a swiftwater rescue team saved two people found hanging Sunday onto a tree after their canoe tipped over in Lincolnton , North Carolina , according to emergency mangement spokesman Dion Burleson . Catawba County officials reported 10 swiftwater rescues . Record-setting hit Philadelphia International Airport , dumping nearly 8 inches of rain in just 6 hours . The storm knocked out power to parts of the airport , leaving some folks in the dark . At least 33 roads in Catawba and Lincoln counties will remain closed on a long-term basis due to storm damage , officials said . Out West . The heavy rains inundated area interstates , leaving cars stranded and traffic backed up for miles . It was more of the same out West as heavy rain mixed with hail pounded the Las Vegas area . The system also triggered a flash flood near the Grand Canyon , flipping a tour bus on its side and sweeping it 300 yards downstream . All 33 passengers crawled out a window to safety . In Hawaii . Tropical Storm Flossie weakened but still brought the treat of torrential rains to the Hawaiian islands on Monday . The storm , with 45 mph winds , prompted officials to close beaches , backcountry trails and some government offices . Tropical storm warnings were up across the islands despite a weakening trend and a slight northwestern shift that could spare parts of the islands a more significant dousing . CNN 's Janet DiGiacomo and Greg Botelho contributed to this report .
NEW : At least 33 North Carolina roads will remain closed long-term due to storm damage . North Carolina flooding claims two lives ; others rescued . Bus near Grand Canyon flips on side , washes downstream . All 33 passengers climb to safety .