( ( ( Ferrel Cell ) ( Some ( of ( ( the ( diverging air ) ) ( at ( ( the surface ) ( near ( 30N moves ) ) ) ) ) ) ) ) ( ( ( poleward and ) ( is ( deflected ( to ( ( the ( ( east ( by ( the Coriolis ) ) ) force ) ) ( resulting ( in ( ( the ( prevailing ( westerly winds ) ) ) ( at ( the surface ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP Ferrel) (NNP Cell)) (PP (NP (DT Some)) (IN of) (NP (NP (DT the) (VBG diverging) (NN air)) (PP (IN at) (NP (NP (DT the) (NN surface)) (PP (IN near) (NP (CD 30N) (NNS moves)))))))) (VP (VP (VBD poleward)) (CC and) (VP (VBZ is) (VP (VBN deflected) (PP (TO to) (NP (NP (DT the) (ADJP (JJ east) (PP (IN by) (NP (DT the) (NNPS Coriolis)))) (NN force)) (VP (VBG resulting) (PP (IN in) (NP (NP (DT the) (VBG prevailing) (NN westerly) (NNS winds)) (PP (IN at) (NP (DT the) (NN surface))))))))))) (. .)))
Ferrel Cell Some of the diverging air at the surface near 30N moves poleward and is deflected to the east by the Coriolis force resulting in the prevailing westerly winds at the surface.
(ROOT (S (NP (NP (DT The) (JJS best) (NN explanation)) (PP (IN for) (SBAR (WHADVP (WRB how)) (S (NP (NN air) (NNS masses)) (VP (VBP move) (PP (IN across) (NP (DT the) (VBN united) (NNS states)))))))) (VP (VBZ is) (SBAR (IN that) (S (NP (DT the) (VBG prevailing) (NNS westerlies)) (VP (VP (VBP move) (NP (NN air) (NNS masses)) (PP (IN from) (NP (NN west))) (PP (TO to) (ADJP (JJ east))) (PP (IN across) (NP (DT the) (VBN united) (NNS states)))) (CC but) (VP (MD may) (VP (VB be) (VP (VBN deflected) (PP (IN by) (NP (DT the) (NN jet) (NN stream)))))))))) (. .)))