Well he protected Lot and his daughters, who reached the Mountains before the fiery destruction of the cities in the Valley. Abraham was earlier taken by one of the three men, who had accepted Abraham’s invitation to have their feet washed, and to sit in the shade of a tree and be fed with fresh bread baked by Sarah, and the meat of a fatted calf, killed especially for them, plus cream and milk supplied by Abraham, and that messenger of the Lord, who was one in the body of the Lord, had taken Abraham from his camp to a high point from where he could Look down into the valley, where the cities of Sodom and Gomorrah were. Later Abraham went back to his camp, where early on the next day, he would have heard the blast and undoubtedly felt the shock waves, ect.
Genesis 19: 23- 25; The sun was rising when Lot reached Zoar. Suddenly the LORD rained burning sulphur on the cities of Sodom and Gomorrah and destroyed them and the whole valley, along with all the people there and everything that grew on the land.
27 Early the next morning Abraham hurried to the place where he had stood in the presence of the LORD. He looked down at Sodom and Gomorrah and the whole valley and saw smoke rising from the land, like smoke from a huge furnace.
The following Link, has the accounts of those who witnessed the Tunguska event.
Tunguska event - Wikipedia