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PolskiCloud Seeding Lab (2D)
Silver-iodide aerosol nucleates supercooled cloud droplets; ice crystals then grow by vapor deposition until their fall speed beats the updraft holding the cloud up and they precipitate out.
This 2D companion turns the 3D cloud-seeding lab into a readable side-view microphysics model: aerosol particles drift through a cloud layer and can nucleate any liquid droplet they touch, nucleated droplets turn into ice crystals that grow heavier through vapor deposition, and a crystal only falls out as rain once its terminal velocity overtakes the updraft holding the rest of the cloud aloft — turn seeding to zero and precipitation almost stops.
2D cloud-seeding microphysics lab: aerosol-triggered ice nucleation, Bergeron-Findeisen deposition growth, and a mass-dependent fallout threshold against the updraft.
2D · HTML5 Canvas 2D · 60 FPS target · runs fully client-side, no install
A droplet's terminal fall speed depends on its mass. Ordinary cloud droplets are far too light — their fall speed never exceeds the updraft holding the cloud up. Only droplets that freeze onto a seeding nucleus and grow heavy enough via vapor deposition can eventually out-fall the updraft.
Silver iodide only nucleates ice efficiently within a narrow supercooled range, roughly -6°C to -20°C, peaking near -12°C. Outside that band the aerosol still drifts through the cloud but barely converts any droplets to ice.
It is a simplified, visual model of two real mechanisms: ice nucleation by an aerosol and the Bergeron-Findeisen process, where ice crystals grow at the expense of surrounding liquid water because saturation vapor pressure is lower over ice than over water.