thick clouds in the blue sky and lightning in it

Background, Clouds, Sky, Cloudy, Nature, Summer, Rain, Weather, Overcast, Outdoors, Stormy, Landscape, Light, Natural, Cloud, Atmosphere, Wind, Heaven, Square, Texture, Black, Dramatic, Dark, Danger, Climate, Smoke, Turbulence, Power, Thunder, Cloudscape, Storm, Thunderstorm, Dusk, Scene, Nobody, Heavy, Grey, Gray, Moody, Pressure, Disaster, Bad, Cumulonimbus, Ominous, Meteorology, Hurricane, Gloomy, Gale, Windstorm