Yeah, when I was having a miscarriage I went to the ER at Anderson and it was after 6 PM so they had to call their on-call ultrasound tech. It was March, so no weather there.
Sounds like they're basically cancelling the appointments for stuff that's elective or at least not urgent. I would be thankful if I were a patient scheduled for an MRI or the like that I didn't have to worry about getting out and keeping the appointment, since many times they charge you whether or not you show up.