Fifteen years ago the Chinese government made it snow by seeding the clouds. They have a Beijing Weather Modification Office. See here: http://en.wikipedia.org/wiki/Beijing_Weather_Modification_Office
The U.S. Government has been involved in some publicly released weather modification dating back as far as the 1950s. http://en.wikipedia.org/wiki/Weather_modification There has been some legislation proposed but not passed back in 2005 and 2007.
Either we dropped the ball on the technology that could potentially weaken these deadly storms or the U.S. government is less forthright than red China.
On a side note, it is certainly interesting that the climate change propagandists seem to revel in these monster storms.