Storm

Slate cloud, charcoal, stormy blue, lightning yellow, and rain-wet stone.

Pre-thunderstorm sky colors with one bright accent — lightning yellow — to give it a heartbeat. The other four are greys with intent: slate cloud up high, charcoal where the rain starts, stormy blue in the gap between, rain-wet stone on the ground. Works for dashboards, high-contrast UIs, and anything that wants to feel weighty.