If the weather.com projected temperatures are not at least 50 degrees for two hours out from the start time of the match, then unless the coaches agree to play outdoors, the match is to be moved indoors.
If there is no indoor backup and one or both of the coaches refuse to play, the match is to be cancelled. The problem with the CS "indoors" is that they cannot be heated to 51 degrees so under the ITA rules they don't qualify as a viable indoor backup in case of cold weather.
The same thing happened in Waco...it was 48 and sunny but the Ohio State coach refused to play the match. It was really nice weather - the funny thing is that the Ohio State team had been out earlier practicing in t-shirts!