stormy sky
A thunderstorm is characterized by lightning, thunder and gusts of wind, usually accompanied by rain showers or hail.
rain 
Precipitation of water droplets produced when the air temperature is higher than 32°F.
rainbow 
Luminous arc formed of bands of color; during a shower, it is visible in the opposite direction to the Sun.
lightning 
Brief but intense luminous phenomenon caused by an electrical discharge between two clouds or between a cloud and the ground.
cloud 
The very imposing cloud that generates thunderstorms is the cumulonimbus; it can reach a thickness of 6 mi and its base is very dark.