Driving to Windsor on June 18 when an amazing scene developed before our eyes as a storm front headed into Canada from Michigan. Clear and distinct ridges of clouds which appeared like a giant mushroom cloud above our heads. Within moments winds hit upwards of 50-75 km/hour estimated. Trucks, cars and other vehicles pulled over as the wind hit and the rain came straight across. Within 15 minutes it had passed over and calm prevailed. WOW!