(S (S (PP (IN In) (BASENP (NNP Massachusetts))) (COMMA ,) (S (S (BASENP (JJ heavy) (NN snow) (CC and) (NN blizzard) (NNS warnings)) (VP (VBD were) (PP (IN in) (BASENP (NN effect))))) (SBAR (IN as) (S (BASENP (NN visibility)) (VP (VBD had) (VP (VBN been) (VP (ADVP (RB greatly)) (VP (VBN hindered) (PP (IN by) (BASENP (DT the) (VBG falling) (NN snow))))))))))) (PERIOD .))