I have Xfinity-X1 and for the last two days have a black screen on The Weather Channel. Both 32 and 832 are black with no sound but do show information. I am not asking about channel 101 as I understand that channel has been deleted from the lineup (bummer). This is the main Weather Channel. I rebooted but that made no difference.
The local overlay generally means the channel itself is working and your box is receiving it. What is wrong is that the IntelliStar device that adds the overlay onto the national video feed is either not getting the feed, or is not passing it through.