It seems to contradict the prediction of Our Lady of Akita -- which way will 3/4 of the world's population be destroyed? By demons from hell, or by fire from the sky?
Our Lady of Akita says nothing about boarding up the windows, etc.
Fr. Doran (one of my old seminary professors) said the Three Days of Darkness would rank as "tolerated opinion" on the Theological Scale of Certainty (De Fide, De Fide Proxima, etc.) which is about the lowest ranking -- basically opinions that have nothing un-Catholic in them.
The way the prophecy says that scoffers, even doubters (which, in my opinion, is always a good thing when it comes to private revelation and prophecy -- the Church herself advises us to be that way!) will be lost. Sounds a bit fishy to me.
Those who spread the message will be protected, but the scoffers, the skeptics, and those who dismiss the message because they are frightened, will not escape the chastisement.
I wouldn't reject anything just because I was afraid -- I think most readers of CathInfo.com would agree with that :)
But I want to be cautious about believing just anything, especially when it doesn't "fit" with other things much more certain.
God bless,
Matthew