Originally Posted by
rudestuff
You always have to commit to something in the end! You don't need to go all the way to minima at your destination before committing to the alternate.
So your answer would be you don't need any other considerations when proceeding to your alternate. Being above minima would be enough although the decision is been made long before TOD. What if the decision to proceed to the alternate was other but not the impossibility to reach your original destination?