Thunderclap
A single sharp burst of thunder — sound that announces a storm already in progress.
A thunderclap in a dream is the dream's image of sound that announces a storm already in progress. The clap arrives with no warning; the lightning that produced it has already happened. The dream brings the thunderclap when something in your life — a sudden public announcement, a loud piece of news from elsewhere, an emotional release that broke over the house — has arrived as a single jarring sound whose source was already at work before you heard it. A thunderclap heard and prepared for in the next minute is the dream affirming the honest response. A thunderclap that leaves the household frozen, with no one moving to close the windows, is the dream noting that the warning was given and the response stopped at the noise.