( ( ( ( Low pressure ) or ) ( falling pressure ) ) ( generally ( ( ( means ( ( cloudy ( , ( ( unsettled or ) wet ) ) ) weather ) ) ( while ( ( ( ( high pressure ) or ) ( rising pressure ) ) ( means ( ( ( calm and ) clear ) weather ) ) ) ) ) . ) ) )
(ROOT (S (NP (NP (NNP Low) (NN pressure)) (CC or) (NP (VBG falling) (NN pressure))) (ADVP (RB generally)) (VP (VBZ means) (NP (ADJP (JJ cloudy) (, ,) (JJ unsettled) (CC or) (JJ wet)) (NN weather)) (SBAR (IN while) (S (NP (NP (JJ high) (NN pressure)) (CC or) (NP (VBG rising) (NN pressure))) (VP (VBZ means) (NP (ADJP (JJ calm) (CC and) (JJ clear)) (NN weather)))))) (. .)))
Low pressure or falling pressure generally means cloudy, unsettled or wet weather while high pressure or rising pressure means calm and clear weather.
(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.