( ( The ( fohn-wind family ) ) ( ( consists ( of ( winds ( that ( ( are ( ( warm and ) dry ) ) ( because ( ( their air ) ( has ( been ( ( warmed ( by compression ) ) ( as ( they ( ( ( flow over ) ( the mountain ) ) ( ( ( ranges and ) ( then down ) ) ( the ( leeward slopes ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (JJ fohn-wind) (NN family)) (VP (VBZ consists) (PP (IN of) (NP (NP (NNS winds)) (SBAR (WHNP (WDT that)) (S (VP (VBP are) (ADJP (JJ warm) (CC and) (JJ dry)) (SBAR (IN because) (S (NP (PRP$ their) (NN air)) (VP (VBZ has) (VP (VBN been) (VP (VBN warmed) (PP (IN by) (NP (NN compression))) (SBAR (IN as) (S (NP (PRP they)) (VP (VBP flow) (PRT (RP over)) (NP (DT the) (NN mountain)) (NP (NP (NNS ranges)) (CC and) (ADVP (RB then) (RB down)) (NP (DT the) (JJ leeward) (NNS slopes))))))))))))))))) (. .)))
The fohn-wind family consists of winds that are warm and dry because their air has been warmed by compression as they flow over the mountain ranges and then down the leeward slopes.
(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)))))))) (. .)))