I'm not sure, Moose, if you and I are addressing the same point. So to be clear, let me say that I am talking about the newly-required 30 minute break. The CFR 352 rules you cite are talking about driving time. These are two different topics.
Again, I have researched the rules and checked with our carrier's log compliance people to verify my interpretation of the rules. While it is not a pleasant fact, it remains a fact nevertheless. That is, the adverse conditions exception that applies to driving time does not apply to the 30 minute break.
As a practical matter, this means, for example, that if you are on duty or driving for say six hours, and you plan to take your 30 minute break at the next rest area, but adverse conditions develop before you get there that prevent you from taking your 30 minute break within the mandated eight-hour period, you would be in violation. The adverse conditions might be something like the freeway being closed by a major accident, trapping you in stopped traffic for more than two hours.
There are no exceptions to the 30 minute break within eight hours rule. If circumstances develop that are out of your control that prevent you from taking your required break, you are in violation. There is nothing right or fair about it, but that's the way it is.