(S (S (S (BASENP (DT A) (NN tornado) (NN warning)) (VP (VBD was) (VP (VBN issued) (PP (IN for) (BASENP (DT the) (NN downtown) (NN area)))))) (SBAR (BASENP (DT a) (JJ few) (NNS minutes)) (SBAR (IN before) (S (BASENP (DT the) (NN storm)) (VP (VBD hit)))))) (PERIOD .))