"The spell? I was simply asking the clouds to appear and the rain to start." It's said as if it's the most obvious thing in the world. That's just how magic is done in England. One asks the elements and asks nature to move and hopes that they're willing to listen.

"Unless you were asking about the technical text?" It's still raining, despite the fact that Strange seems to be paying no attention to the actual rain and is instead talking to Syrlya.