Thunder
Thunder is the sky's great voice, so it stands for news that carries and for authority. Hearing it roll is a good omen that your name travels or that large news arrives, and it was read as the season when something long prepared comes into the open. If lightning is the flash of insight, thunder is that news reaching other people's ears. Cowering in fear of it, by contrast, signals that the change approaching feels like too much.
Thunder is the sound that reaches you only after the lightning has already passed. Traditional reading took resounding thunder as a name becoming known and read it favourably. The quality of the sound decides the meaning.
Readings by Situation
Hearing thunder roll out
A good sign that your name becomes known. Tradition read a great sound as word spreading through the world. Take it as your work coming into view.
Waking startled by thunder
A sign that the sound inside you is loud. Tradition too read waking startled as something kept down. Seeing what nags at you brings the answer closer.
Thunder rumbling far off
A sign that change is approaching. It has not arrived, so there is time to prepare. Read it as a call to attend to what you have deferred.
Thunder with no rain
A sign of loud sound with nothing behind it. Tradition sometimes read it as empty word. If something is being said loudly, check it once more.
Thunder dreams do not forecast a real disaster. Tradition handled thunder as a symbol of name and authority, so there is no need to be alarmed. It also comes up often when your sleep is rough.