Strong storms swept through 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 covered Yellowhead County as the cell ramped up. Heavy rain sparked flash flooding across low-lying areas of the metro. Whitemud Drive in west Edmonton ended up closed under standing water. Major arteries shut down as crews pushed through blocked intersections. Travel plans collapsed across the city, with drivers slogging through the sudden downpour.