Who is this, and what is here?

Picture taken out my bedroom window, after camera grabbing was sufficiently speedy for a change.
The mostly-dead tree is in the back yard of one of the units in the row across the parking lot; the background is a very snowy roof, rather than a cloudy sky.
Given the perceptual size—much larger than the mourning doves who usually sit in that tree, something that you'll just have to take my word for—and the profile, I am saying female Cooper's Hawk.