Strong storms swept through Edmonton late Saturday, pushing very large hail near the city limits. A tornado warning was issued for Stony Plain, west of Edmonton, as rotating clouds tracked across the region. Another warning covered Yellowhead County as the cell ramped up. Heavy rain caused flash flooding across low-lying areas of the metro. Whitemud Drive in west Edmonton was left closed under standing water. Major arteries shut down as crews rushed to blocked intersections. Travel plans fell apart across the city, with drivers trapped by the sudden downpour.