Convergence zone lift can at times be somewhat turbulent   especially if air from different sources is mixing  such as  along a sea-breeze front. The general roughness may be  the only clue of being along some sort of convergence line.  There can also be narrow and rough (but strong) thermals  within the convergence line. Work these areas like any other  difficult thermals  using steeper bank angles and more speed  for maneuverability. Finally  lift sources have been categorized into four types:  thermal  slope  wave  and convergence. Often  more than  one type of lift exists at the same time  such as thermals  with slope lift  thermaling into a wave  convergence zones  enhancing thermals  thermal waves  and wave and slope lift.  In mountainous terrain  it is possible for all four lift types  to exist on a single day. The glider pilot needs to remain  mentally nimble to take advantage of various types and  locations of rising air during the flight.  Nature does not know that it must only produce rising air  based on these four lift categories. Sources of lift that do  not fit one of the four lift types discussed probably exist.  For instance  there have been a few reports of pilots soaring  in travelling waves  the source of which was not known. At  some soaring sites  it is sometimes difficult to classify the  type of lift. This should not be a problem. Simply work the  mystery lift as needed  then ponder its nature after the flight. Combined Sources of Updrafts 10-24