A lot of theologians are expecting to see hail stones that are 100 pounds in weight as evidence that the Lord God Almighty has done what he said he will do. Without hailstones they are prone to disbelieve much of what the book of Revelation has said. What they fail to realize is that God does not operate on their timeline. The book of Revelation is not written in linear fashion so that everything takes place in chronological order from the beginning of Revelation to the end. The book is written as snapshots of events that will occur over a period of decades.
Nonetheless, the issue of hail stones is one that has many looking up to the sky, wondering when that 100 pound hail stone will fall, and daring anyone to force them to believe anything without the evidence of the hail stones. The laws of the universe would suggest that 100 pound hail stones are an impossibility. However, when we consider all of the filth that has been used to seed the clouds over the past few decades, 100 pound hailstones come within the realm of possibility. That we have not yet seen them does not mean they have not fallen. That we have not yet heard about them may simply mean that the news media refused to report the news.
That we would base our salvation and the chance to spend eternity with God on whether or not we had witnessed hail stones is evidence of our lack of spiritual discipline. A genuine disciple takes things one day at a time, one step at a time, and eschews the right to know the entire story from beginning to end before making a move. A genuine disciple trusts that God will reveal things in due course when the timing is right. A genuine disciple loves the excitement of not knowing what will happen next. The Lord God Almighty reigns.