A vast dark figure that rises from calm seas, the umibozu is read as sudden overwhelming emotion from the depths. Tradition takes it as a fear that appears when everything seemed still.
Has this come up in your dreams before? What was going on in your life then?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.