RedactedNarrative: Vessel 1 was traveling at about 10 miles per hour in a congested narrow area in the Mud Creek area on Weiss Lake.  Vessel 2 was traveling at about 25 miles per hour going in the opposite direction.  Vessel 2 was behind several other personal watercraft vessels.  He did not see Vessel 1 until he struck the vessel with his personal watercraft.  The impact was on the port side of vessel 1.  All involved stated that the wake from the other personal watercraft helped to push vessel 1 into vessel 2.  The primary cause seems to be  operator inattention.  I responded by vehicle from the Gadsden area, approximately 50 minutes.  Vessel 1 was on the trailer and vessel 2 was still in the water. Vessel 2 operator was wearing his PFD, Vessel 1 occupants were not, but had them available.