Any chance of a cancelation tomorrow?

My wife and I are flying tomorrow from RIC-EWR-LHR. We were able to change our flight to EWR to an earlier time in the morning so we wouldn't have any chance to miss the flight to LHR.

I just saw that the flight waiver was expanded for tomorrow to include several other airports, which makes me think that the snow tomorrow will be worse then they originally thought. Is there any chance that our 6:00pm flight to LHR gets canceled outright? I was thinking at worst it could get delayed a few hours but now I'm wondering about the possibility of it getting canceled.

edit.

Lol I guess I was right to worry, United has completely rebooked me to go through IAD