Why"s Rachel's hair wet when she comes into Central Perk on the first episode of Friends?

And why'd she go there or even know to go there when she hadn't seen Monica in years, fell so much out of touch with her that she didn't even invite Monica to her wedding that day?
Update: Don't guess. Of course if it had been raining, we'd know that because we've got a street view when she comes in. But it wasn't raining. I mean, I'm not retarded.
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