( ( When ( seagulls ( fly high ) ) ) ( , ( ( stormy weather ) ( ( is expected ) . ) ) ) )
(ROOT (S (SBAR (WHADVP (WRB When)) (S (NP (NNS seagulls)) (VP (VBP fly) (ADJP (JJ high))))) (, ,) (NP (JJ stormy) (NN weather)) (VP (VBZ is) (VP (VBN expected))) (. .)))
When seagulls fly high, stormy weather is expected.
(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.