Perishable Pileus
With the temperature reaching 100 degrees, a developing thunderstorm updraft creates a Pileus cloud. This "cap" like cloud forms as an updraft causes horizontially flowing air to rise over the rising updraft, creating an almost lenticular shaped cloud. This lasted only a few moments, as the updraft powered up throught the Pileus and developed into a full-blown thunderstorm. This developing storm, seen from O'Hare Airport, was actually along the Lake Michigan shore near Zion!
Perishable Pileus
With the temperature reaching 100 degrees, a developing thunderstorm updraft creates a Pileus cloud. This "cap" like cloud forms as an updraft causes horizontially flowing air to rise over the rising updraft, creating an almost lenticular shaped cloud. This lasted only a few moments, as the updraft powered up throught the Pileus and developed into a full-blown thunderstorm. This developing storm, seen from O'Hare Airport, was actually along the Lake Michigan shore near Zion!