A meteogram records what the sky did. This one records a twenty-four-hour synthetic storm: pressure falling for the warm front, recovering through the warm sector, falling again for the cold front, then climbing into clearing.
Three traces stack on the canvas — pressure (violet), temperature (cream), wind speed (orange). The vertical bar is now. Everything left of it has happened.
Click to inject a new low. Press space to restart the day. Drag to scrub.