Kling 2.1 (pro)
Subtle cinematic animation: The dark, turbulent clouds visibly churn and swirl, their immense forms slowly shifting and roiling across the sky. Faint, internal flashes of light subtly pulse from within the cloud mass, hinting at distant lightning. The overall illumination of the sky subtly darkens and brightens, creating a living, breathing sense of a vast storm. The camera can perform an imperceptible, ultra-slow push-in or subtle vertical drift, emphasizing the overwhelming scale of the celestial phenomenon. The animation is minimal in explicit action but maximal in conveying immense, atmospheric power and foreboding energy."