This is an experimental UDK project that was built for an exploration experience.  The trees were created in SpeedTree and the other static meshes were used from UDK.  I created the rain particle effect as a texture and added them to mesh planes.  The envirnoment textures were made in Photoshop and imported into UDK.  The portal takes you to the second half of the level which is the snow experience.  Snow particles created in Kismet and snow textures created in Photoshop.  Trees were created and imported from SpeedTree.