Strong storms barraged Edmonton late Saturday, packing very large hail near the city limits. A tornado warning was issued for Stony Plain, west of Edmonton, as rotating clouds advanced across the region. A second warning blanketed Yellowhead County as the cell ramped up. Heavy rain triggered flash flooding across low-lying areas of the metro. Whitemud Drive in west Edmonton ended up closed under standing water. Busy stretches of road shut down as crews rushed to blocked intersections. Travel plans collapsed across the city, with drivers trapped by the sudden downpour.