Inky Black Gust Front

I found myself watching an incoming storm from work on Friday morning, June 21, 2013 without my regular camera on hand, being caught unaware of the weather potential approaching from the northwest. I therefore resorted to using my cell phone's panoramic camera feature to capture these images of a menacing looking shelf cloud on the leading edge of a gust front. The top image was captured at 9:04 AM, the bottom at 9:19 AM. The building at left in both images is the Sport Zone, located on North 18th Street in Hiawatha, Iowa. As the storm blew through, it turned the sky inky black and dropped copious amounts of rain.