Before the bodily return of the Lord Jesus to earth, our age will be filled with outlandish wickedness, deception, war, supernatural miracles, plagues from God, suspense, etc. That spells big trouble for that generation! The unique sufferings then will come from various areas, including 100 pound hail stones! 
We can only surmise the massive damage 100 pound hail stones will create upon impact in light of what happened in Vivian, SD on July 2010, when the world record hail stone smashed its way down. It was a 1.93 pound (8 inch in diameter) hail stone. During that storm hail stones penetrated roofs, car windshields and put coffee can size dents in the ground! (See pictures.) Imagine hail stones 50 times that size crashing down on buildings and roads, and especially on people! 100 pound hail stones will be like mini bombs, which rip and pulverize whatever they hit. Such is coming to our planet and are sent from God:
And huge hailstones, about one hundred pounds each, came down from heaven upon men; and men blasphemed God because of the plague of the hail, because its plague was extremely severe. (Rev. 16:21, NASB)
God has sent destructive size hail down in Moses’ day as a Judgment on Egypt (Ex. 9) and on the Amorites in Joshua’s day:
As they fled before Israel on the road down from Beth Horon to Azekah, the LORD hurled large hailstones down on them from the sky, and more of them died from the hailstones than were killed by the swords of the Israelites. (Josh 10:11)
In Hag. 2:17, hail was an attempt by God (along with blight and mildew) to bring backslidden Israel back to the Almighty:
“I struck all the work of your hands with blight, mildew and hail, yet you did not turn to me,” declares the LORD.
Again, we learn that God controls the weather, and has used adverse conditions to prompt sinful people to repent, if they are willing. God wants the backslider back! Getting back to the time of the 100 pound hail stones yet to fall, several verses before that event the Lord Jesus said:
Behold, I come like a thief! Blessed is he who stays awake and keeps his clothes with him, so that he may not go naked and be shamefully exposed. (Rev 16:15)
That implies not all will be spiritually awake! In the Parable of the Ten Virgins all ten virgins fell asleep (Mt. 25:5). Only 50% were still known by the Lord when he did arrive. The other 50% fell away and were no longer known by the Lord in the way of salvation. Jesus said to them:
But he replied, “I tell you the truth, I don’t know you.” Therefore keep watch, because you do not know the day or the hour. (Mat 25:12,13)
Jesus didn’t say to the 5 foolish virgins, I never knew you as in Mt. 7:23, because they were previously saved! Dear reader, are you keeping watch? Is your lamp still burning? If you have eternal life now, guard it. Remember Rev. 3:11 and 1 John 2:24-26.
