A ghostly hunting party sweeping across the night sky is traditionally read as forces in your life moving too fast to stop. It stands for upheaval, being swept up in something larger, or the wish to run free.
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.