yes, the clouds are very dark.
A thunderstorm WILL be coming. The meteorologists know for sure.
Either when the weather channel shows a large cloud mass that says thunderstorm, you see thunderheads (cloud formations), there are lots of signs. You can get more from the internet.
Prior to a Thunderstorm, the sky will turn gray. There may be a noticeable change in temperature. The wind may start or get worse. You might see distant lightning or hear rolls of thunder without lightning. Light rain may start and stop even before the main storm comes. If the wind is coming toward you, the storm is coming you.
Wind Direction
Dark gray and flat or really dark almost black and puffy
A sign that a thunderstorm is coming is a large amount of humidity in the air. This is a proven cause of joint pain or discomfort.
Thunderstorm
This is his first sighting of the creature after its creation.
A thunderstorm does not strike anything, it is "lightening" that does that.
coming..
The cumulus stage, in which the thunderstorm develops, the mature stage, in which the thunderstorm is most intense, and the dissipating stage, in which the thunderstorm declines and ends.
Yeah... The thunderstorm caused the power to go out. The thunderstorm startled the dog. The weatherman warned that a thunderstorm was on its way.