A massive winter storm passed through Thunder Bay Wednesday night, dumping snow throughout the city, cancelling school bus service and closing one highway in the region. According to Environment Canada, about 15 cm of snow fell in Thunder Bay. Some communities to the west of the city, including Atikokan and Upsala, received between 10 and 20 cm. Highway 11 between Hearst and Longlac was closed for several hours Thursday morning.