( ( ( Torrential downpours ) ( from thunderstorms ) ) ( ( ( ( caused ( ( rapid flooding ) ( of ( small creeks ) ) ) ) and ) streams ) . ) )
(ROOT (S (NP (NP (JJ Torrential) (NNS downpours)) (PP (IN from) (NP (NNS thunderstorms)))) (VP (VP (VBD caused) (NP (NP (JJ rapid) (NN flooding)) (PP (IN of) (NP (JJ small) (NNS creeks))))) (CC and) (VP (VBZ streams))) (. .)))
Torrential downpours from thunderstorms caused rapid flooding of small creeks and streams.
(ROOT (S (NP (DT A) (NN stream) (NN flooding)) (VP (VBZ is) (ADVP (RBS most) (RB likely)) (VP (VBN caused) (PP (IN by) (NP (DT a) (NN thunderstorm))))) (. .)))