( ( Chinook winds ) ( ( are ( ( ( ( warm ( , ( dry winds ) ) ) ( that ( occur ( on ( the lee ) ) ) ) ) - ) ( side ( of ( high ( mountain ranges ) ) ) ) ) ) . ) )
(ROOT (S (NP (NN Chinook) (NNS winds)) (VP (VBP are) (NP (NP (NP (JJ warm) (, ,) (JJ dry) (NNS winds)) (SBAR (WHNP (WDT that)) (S (VP (VBP occur) (PP (IN on) (NP (DT the) (NN lee))))))) (: -) (NP (NP (NN side)) (PP (IN of) (NP (JJ high) (NN mountain) (NNS ranges)))))) (. .)))
Chinook winds are warm, dry winds that occur on the lee-  side of high mountain ranges.
(ROOT (S (NP (NN Chinook) (NNS winds)) (VP (VBP occur) (SBAR (WHADVP (WRB when)) (S (NP (NN air)) (VP (VBZ is) (VP (VBN forced) (PP (IN over) (NP (DT a) (NN mountain) (NN range)))))))) (. .)))