Thousands of residents lost power and vehicle crashes slowed the evening commute Monday as heavy rainfall and thunderstorms struck Clark County and other parts of the Portland metro area.The first storms moved in late Monday afternoon. Around 4:30 p.m., the Bonneville Power Administration lost its feed with Clark Public Utilities, causing an estimated 14,325 customers to lose electricity in Camas and Washougal, Clark Public Utilities spokeswoman Erica Erland said. She said the outage was weather-related. Customers started to get their power back just after 7 p.m.About half an inch of rainfall was recorded Monday evening at Pearson Field, said Steve Pierce, a Salmon Creek resident, Columbian weather blogger and president of the Oregon chapter of the American Meteorological Society. “That’s a good amount of rainfall for one day in the month of June,” Pierce said. Although rain and thunderstorms aren’t unheard of in the spring, Monday’s thunder, lightning and downpours (and reports of marble-sized hail in Oregon) were more than what forecasters expected, he said. During the storms, the Washington State Patrol reported several vehicle spin-outs on highways around the county, Trooper Will Finn said.Just after 5:30 p.m., a tractor-trailer crashed on state Highway 14 eastbound near Evergreen Boulevard. As the tractor-trailer traveled uphill in the right lane, its driver apparently noticed too late that traffic had stopped, Finn said.