(S (S (ADVP (RB However)) (COMMA ,) (S (BASENP (NNS meteorologists)) (VP (ADVP (RB also)) (VP (VP (VBP express) (BASENP (NN caution))) (PP (IN in) (S (VP (VBG saying) (SBAR (IN that) (S (NP (BASENP (RB even) (DT a) (JJ slight) (NN change)) (PP (IN in) (BASENP (NN course)))) (VP (MD could) (VP (VP (VB take) (BASENP (DT the) (NN storm))) (ADVP (RBR closer) (PP (TO to) (BASENP (NN land))))))))))))))) (PERIOD .))