A wave-like pattern of mid-level clouds that followed the development of mid-level mammatus over the

alt="A wave-like pattern of mid-level clouds that followed the development of mid-level mammatus over the western San Fernando Valley. View is southeast from the Simi Hills near Sage Ranch Park. January 7, 2011 at about 4:37 p.m." border="0">

A wave-like pattern of mid-level clouds that followed the development of mid-level mammatus over the western San Fernando Valley. View is southeast from the Simi Hills near Sage Ranch Park. January 7, 2011 at about 4:37 p.m.

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