At the Cathedral of Learning, Dorothy spent last night perched at the nest. Here she is sheltering from this morning's pre-dawn thunderstorms.
As far as I know female peregrines don't roost at the nest unless they're ready to lay eggs in a couple of days.
However my knowledge of this is very limited. I only learned about it last year when we were able to see the nests at night for the first time.
It seems too early for eggs, but who knows. We'll just have to wait and see what this means.
(photo from the National Aviary snapshot camera at University of Pittsburgh)