Just where the turn to downwind occurs is usually determined by wind and terrain conditions but occasionally traffic may require turns sooner or later.
(the turn to downwind; occurs; ) (Just where the turn to downwind occurs; is determined; by wind and terrain conditions; T:usually) (traffic; may require; turns sooner or later; T:occasionally)
the turn to downwind Just where the turn to downwind occurs traffic
occurs is determined may require
by wind and terrain conditions T:usually
turns sooner or later T:occasionally