Rolling Dark Clouds of the Stormline

It was the usual afternoon last week, clouded but not stormy, and we were standing on the deck, when suddenly the dark clouds started rolling toward us. They came suddenly, with a burst of wind. Above our heads the clouds churned with boiling air currents, forming a dark line all the way across the sky, passing by quickly; the rain didn’t start til after they’d passed.

I went and looked at the radar, and it showed the longest stormline I’d ever seen, stretching all the way across southwest Ontario, from Sarnia to Orillia, and moving southeast steadily.