A weather phenomenon that was caught on camera in Au Train, Michigan, looked like a giant tsunami rolling in from the ocean. But it was really a shelf cloud rolling over Lake Superior. The ominous cloud stayed close to the lake water, sucking up moisture and growing bigger as it moved toward shore. Holly Belongie Marenger caught the weather event on camera. Marenger said it was about 85 degrees, but the presence of the shelf cloud made the temperature drop, and created an eerie effect over the lake. The cloud pulled lake water into itself, but didn't drop it.