The Tunguska Disaster

"At breakfast time I was sitting by the house at Vanavara Trading Post, facing north. I suddenly saw that directly to the north, over Onkoul's Tunguska Road, the sky split in two and fire appeared high and wide over the forest . The split in the sky grew larger, and the entire northern side was covered with fire. At that moment I became so hot that I couldn't bear it as if my shirt was on fire; from the northern side, where the fire was, came strong heat. I wanted to tear off my shirt and throw it down, but then the sky shut closed, and a strong thump sounded, and I was thrown a few meters. I lost my senses for a moment, but then my wife ran out and led me to the house. After that such noise came, as if rocks were falling or cannons were firing, the earth shook, and when I was on the ground, I pressed my head down, fearing rocks would smash it."

30 June 1908, Stony Tunguska River, Yeniseysk Governorate

People saw a column of bright bluish light streaking across the sky. Then came the flash and the thunder. People were knocked off their feet and windows shattered hundreds of kilometers away.

The Tunguska Event was a meteor explosion that occured in Siberia. There were no casualties. What if we weren't that lucky? What if the meteor had just differed in size or angular velocity?

Point Of Divergence
The meteor that caused the Tunguska event was larger than OTL, surviving the atmospheric entry and impacting the earth.