( ( In ( the ( late afternoon ) ) ) ( , ( ( as ( ( ( the ( earth 's ) ) surface ) ( begins ( to cool ) ) ) ) ( , ( ( ( the direction ) ( of ( air movement ) ) ) ( ( changes ( to downslope ) ) . ) ) ) ) ) )
(ROOT (S (PP (IN In) (NP (DT the) (JJ late) (NN afternoon))) (, ,) (SBAR (IN as) (S (NP (NP (DT the) (NN earth) (POS 's)) (NN surface)) (VP (VBZ begins) (S (VP (TO to) (VP (VB cool))))))) (, ,) (NP (NP (DT the) (NN direction)) (PP (IN of) (NP (NN air) (NN movement)))) (VP (VBZ changes) (S (VP (TO to) (VP (VB downslope))))) (. .)))
In the late afternoon, as the earth's surface begins to cool, the direction of air movement changes to downslope.
(ROOT (S (NP (NP (DT The) (NN movement)) (PP (IN of) (NP (NP (DT an) (NN air) (NN mass)) (PP (IN over) (NP (NP (NN earth) (POS 's)) (NN surface)))))) (VP (VBZ causes) (NP (JJ local) (NN weather) (NNS changes))) (. .)))