Strong storms rolled in across 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 tracked across the region. Separate warning targeted Yellowhead County as the cell ramped up. Heavy rain caused 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 rushed to blocked intersections. Travel plans were thrown into chaos across the city, with drivers trapped by the sudden downpour.