As I was talking my daily walk on May 5, I saw this pretty cloud. Someplace east of us, thunderstorms were forming.

On May 15, I was driving to the mall to do some shopping and saw this huge cloud. I stopped to take a picture of it and to call Ted, telling him it would be worth his time to go to the top of the hill behind our house (less than a half-mile away) to give his meteorological heart a thrill.

From near our house, the above cloud looked pretty amazing but when I got to the mall, which is on high ground with a big parking lot and no trees to block the view, I was awestruck. I couldn’t believe what I was seeing! This cloud extended 180 degrees from north to south on the eastern horizon. I have never seen a cloud that covered half of the horizon! Obviously, a line of thunderstorms was developing–probably in Illinois.

About an hour later, when I finished shopping, the sun was setting and it cast a rosy glow on the same cloud formation. The cloud still covered 180 degrees of the horizon and the thunderstorms were still developing. When I got home, Ted and I checked the radar and saw a solid line of severe thunderstorms stretching from just southeast of St. Louis to Chicago. Wow!