(S (S (S (NP (BASENP (DT A) (NN tornado) (NN warning)) (PP (IN for) (NP (BASENP (NNP Cincinnati)) (CC and) (BASENP (JJ nearby) (NNS towns))))) (VP (VBD was) (VP (VBN issued) (PP (IN by) (BASENP (DT the) (NNP Tulsa) (NN weather) (NN center)))))) (SBAR (BASENP (NN nine) (NNS minutes)) (SBAR (IN before) (S (BASENP (DT the) (NN storm)) (VP (VBD struck)))))) (PERIOD .))