What does Isaiah 21:1 mean?

This is a message about the desert by the sea: Like a storm sweeping in from the south, trouble is coming from the desert, from a land of terror. Isaiah 21:1 - Modern Text Bible

(Isaiah is warning about disaster coming from the desert, likely referring to Babylon. The 'desert by the sea' points to a region near Babylon, and the storm imagery shows how sudden and unstoppable this trouble will be.)