A weather report is read as a reading of the emotional climate, your own or that of people around you. Dream books link sunny maps to calm and storm warnings to tension being sensed.
When this appeared in your dream, what were you feeling?
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.