For the crew arriving from Milliways:

The door from Milliways opens onto what would ordinarily be a picture-perfect day in early October over Central Park West. The air ought to be crisp and clear this high up. Certainly the view of Central Park, its leaves beginning to turn all kinds of colors, would support that...

... only anyone who actually pokes a head or hand or limb out the door will feel that it's not. It's warm- unseasonably so- and the air is tight somehow, shivering against the skin. There's an unpleasant, greasy feel to it, a sense of something about to precipitate out of nowhere at all. And far, far overhead, the sky roils and writhes in livid bruise-purple colors, torn open in a ferocious act of metaphysical savagery.

Looking up for too long is probably not a good idea.