( ( ( Sunday 's ) forecast ) ( ( calls ( for ( ( ( ( mostly cloudy ) but ) pleasant ) ( weather conditions ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP Sunday) (POS 's)) (NN forecast)) (VP (VBZ calls) (PP (IN for) (NP (ADJP (ADJP (RB mostly) (JJ cloudy)) (CC but) (ADJP (JJ pleasant))) (NN weather) (NNS conditions)))) (. .)))
Sunday's forecast calls for mostly cloudy but pleasant weather conditions.
(ROOT (S (NP (JJ Cloudy) (NNS conditions)) (VP (MD will) (ADVP (RBS most) (RB likely)) (VP (VB result) (PP (IN from) (NP (DT a) (JJ low-pressure) (NN weather) (NN system))))) (. .)))
Cloudy conditions will most likely result from a low-pressure weather system.