A spring snowstorm brought two highways in Alberta, Canada, to a standstill and left 300 vehicles stranded overnight into Friday as the authorities mobilized to bring them provisions, an official said. Two highways, 63 and 881, were closed because of the weather, according to the Royal Canadian Mounted Police. An emergency helicopter service that flew over the highways had estimated that 300 vehicles were stranded, according to a news release from the RCMP. On Friday, Highway 63 was closed around 1 a.m. and Highway 881 was closed around 9 a.m. As of Friday evening, Highway 63 remained closed and parts of 881 were open, though travel was not recommended. “We’ve had dozens of calls from stranded motorists,” said Cpl. Teri-Ann Bakker, a spokesperson for the RCMP. The storm, which stretched from the Northwest Territories through Alberta and part of Saskatchewan, had created rapid whiteout conditions and dropped more than 1 foot of snow, Bakker said.…