In the image to the right, the streaks of cloud-like material underneath the main cloud are virga. (Dry thunderstorms are those that produce virga.) A cloud that produces thunder, lightning, and rain are common in the western United States, but these clouds often do not have measurable ground-level precipitation. These dry thunderstorms are often culprits in creating massive wildfires as lightning ignites a dry fuel source on the ground during fire weather season (Usually in the hot summer months).
It is also theorized that virga are partially responsible for creating hole-punch clouds. In addition, virga high in the atmosphere can reflect sunlight creating brilliant sun pillars and other atmospheric optics associated with sunlight.