Storm Wall Lab simulates the dramatic visual spectacle of a supercell thunderstorm wall cloud — the rotating, lowered cloud base that forms beneath the main updraft of a severe thunderstorm. The shader recreates the ominous, structured appearance of a mesocyclone with layered cloud dynamics and atmospheric lighting.
The cloud structure is built from layered FBM noise fields shaped into the characteristic rotating wall cloud form — a lowered, rain-free cloud base with visible rotation. Upper cloud layers show the overshooting anvil top, while the wall cloud descends with laminar banding that reveals the inflow structure. Atmospheric perspective adds depth, with haze increasing toward the distant precipitation curtain.
Lightning flashes illuminate the cloud interior with subsurface scattering, briefly revealing the volumetric structure. Interactive controls adjust storm intensity, rotation speed, lightning frequency, and atmospheric conditions.