Gray clouds are a mystery. I've seen them in the night sky. It could mean something is covered or obscure, yet to be known, future behind it. Why the color gray? A mix of white and black (and it's color meanings)? Or it could be relating to a black and white image, one thought being another level, or a level in between.That associated with materialism.More possibilities maybe.
Silver may represent gifts (after the clearing). Silver is often associated with the moon or lunar. Therefore, night or dark time, or power.
One of my last dreams had a funnel cloud and tornado in it. It was my first time seeing this in a dream. Before this, I thought of it being chakra activity. It can also mean disturbance I guess. I'm observing what this means in my life right now. It so far it has meant disturbance for me. Someone had a funnel cloud in a dream, but I don't recall any mention of difficulty following it. So, maybe it has to do with chakra activity, and it depends on the person, how the message or funnel plays out? I haven't had a clear dream since this one to help me understand more, or feel at more ease. The woman in my dream who took off into a storm, spoke of getting out of school and continuing her education.
She's the sort of person that is happy and cheery when you don't stand in her way, but will turn into a nasty beast if you defy, confront or annoy her in the least little bit.
Hmmm...At least your learning early about these kind.There are many of these kinds of people in the world. This kind is to be avoided the best you can.I have a friend who actually causes a little disruption with new acquaintances to see the person's reaction,in order to screen them out of his life. If the person doesn't get upset (forgiving), he continues the relationship. If the person gets out of sorts and has a tantrum, he breaks off ties with the person. For you, since it's your sister, just keep a distance the best you can. Things will get better for you. It's too bad your sister is the way she is.