A cloud gets a very huge charge by clashing with other clouds.
I was going to help you but the clouds got in the way.
However clouds can get in the way of electro-optical sensors.
The clouds were getting thicker or, much more likely, night was falling.
The closer the clouds got, the more intense they looked.
Maybe the clouds just got sick of all the publicity.
And that red cloud has got the admiral badly worried.
The clouds are getting much thicker, I wish they'd go away.
At last the evil cloud got disgusted and stormed away.
The clouds were getting darker as the day was drawing to an end.