Mammatus Clouds Over Dallas
September 04, 2003
This stunning photo of mammatus clouds was captured earlier this summer over Dallas, Texas. The extraordinary sky that evening caused those who saw it to immediately look for their camera. These clouds generally look more evil than is actually the case. Though they're generally associated with storms and instability, mammatus clouds aren't necessarily indicative of severe weather. They typically form as a result of cold downdrafts within mature thunderstorm cells. See the Earth Science Picture of the Day for June 13, 2003.