(S (S (S (BASENP (NNP Sahkalin) (NNP Island)) (VP (VP (VBD was) (PP (IN under) (BASENP (DT a) (FW tsunami) (NN warning)))) (PP (IN on) (BASENP (NNP Friday))))) (COMMA ,) (S (ADVP (RB however)) (COMMA ,) (S (BASENP (PRP it)) (VP (VBD was) (VP (VP (VBN lifted) (ADVP (RB soon))) (ADVP (RB after))))))) (PERIOD .))