( ( Low ( pressure systems ) ) ( ( tend ( to ( bring ( ( windy ( , stormy ) ) weather ) ) ) ) . ) )
(ROOT (S (NP (NNP Low) (NN pressure) (NNS systems)) (VP (VBP tend) (S (VP (TO to) (VP (VB bring) (NP (ADJP (JJ windy) (, ,) (JJ stormy)) (NN weather)))))) (. .)))
Low pressure systems tend to bring windy, stormy weather.
(ROOT (S (NP (PRP You)) (VP (MD can) (VP (VB expect) (ADJP (JJ stormy)) (SBAR (IN if) (S (NP (NP (DT a) (NN center)) (PP (IN of) (NP (JJ low) (NN pressure)))) (VP (VBZ is) (VP (VBG moving) (NP (PRP$ your) (NN way)))))))) (. .)))
You can expect stormy if a center of low pressure is moving your way.