( Extensive ( ( ( ( stratus and ) stratocumulus ) ( low cloud ) ) . ) )
(ROOT (S (NP (NNP Extensive)) (VP (VBZ stratus) (CC and) (VBZ stratocumulus) (NP (JJ low) (NN cloud))) (. .)))
Extensive stratus and stratocumulus low cloud.
(ROOT (S (NP (NNP Stratus) (NNS clouds)) (VP (VBP occur) (PP (IN in) (NP (NP (DT the) (NN low)) (PP (IN of) (NP (DT the) (NNP troposphere)))))) (. .)))