This photo of a front was taken in the summer of 1997. The diagonal line of cumulus clouds along the lower half of the page indicates the approach of a cold front.
As the cold front moved through the area, winds picked up from 15 to 40 knots. The temperature dropped 5 degrees, and large cumulus clouds turned into cumulonimbus. A thunderstorm began to form and later ravished a town 15 miles away from where this photo was taken.
Courtesy of Angie J Venturato