This link provides a list of Weather Modification companies currently operating in the US and much more.  It also contains a list of US Government agencies currently engaging in weather Modification.  In addition, it contains a list of US Patents that apply directly to weather modification and those in active use today.  Plus, much more.

Here’s a snippet of the information contained on the dutchsinse.com website:

Weather modification COMPANIES in operation today inside the USA:

http://www.wtwma.com

http://www.weathermodification.com

http://www.naiwmc.org/

http://www.just-clouds.com/

HAARP patent:

http://www.scribd.com/doc/26517997/Us-Patent-Harrp-5041834#fullscreen:on

http://www.freepatentsonline.com/4686605.pdf

http://www.freepatentsonline.com/4712155.pdf

http://www.freepatentsonline.com/5038664.pdf