Condense & crystallize
Water changes phase and collects into droplets or ice crystals.
Cirrus, cirrostratus, cumulus, fog and snow crystal records show how phase and environment shape visible form.
How it forms
Follow process, not just appearance.
Weather forms are temporary structures made by moving air, changing phase, falling particles, light geometry and electrical processes. Similar-looking scenes can arise from different mechanisms.
Rise & organize
Buoyancy and vertical motion build cloud depth.
Cumulus and cumulonimbus make vertical structure legible, from small heaps to deep storm towers.
Fall & transform
Hydrometeors descend through changing air.
Rain shafts and virga separate surface-reaching precipitation from fallstreaks that disappear aloft.
Bend, reflect & disperse light
The observer becomes part of the geometry.
Rainbows and halos require different particle types and different relationships among light source, particles and viewer.
Separate charge & discharge
Storm microphysics creates electrical structure.
Lightning links precipitation collisions, charge separation and rapid electrical discharge.
Couple Sun, field & atmosphere
Upper-atmosphere light can begin beyond tropospheric weather.
Aurora is included as a nature/atmosphere boundary case and explicitly separated from ordinary weather.
Evidence rule. Process explanations here are sourced synthesis. A visual observation alone is not automatically sufficient to infer the full process history of a real scene.