Black Tide Rolls In

An ominous-looking shelf cloud appears to be rolling over on itself as it approaches the water tower in Hiawatha, Iowa just before noon on Friday, June 18, 2010. The shelf cloud was the leading edge of a squall line that produced 40 mph winds, heavy rain and dangerous lightning. The storm was the first of two similar systems that moved through the Cedar Rapids metropolitan area on June 18. This photo was shot from the Fay Clark Park in the city of Hiawatha and looks southwest.