There must be some major malfunction going on in the studio that they had to pull an emergency... It could be a number of things... one of the 3 screens on the video wall could be not working, the entire video wall being down (although they can use whatever chromakey walls are in the studio as a backup, I don't see why not), camera malfunctions, a similar situation to last weekend's Sunrise Weather could be occurring, short staffed, among any of many other possibilities.
But I have to agree, if you're going to repeat an airing of a live program, make sure you don't show any live radar imagery...