For terral and the others

[JBeukema]

Space Shuttle Science Shows How 1908 Tunguska Explosion Was Caused By A Comet

 

[editec]

"There is a mean transport of this material for tens of thousands of kilometers in a very short time, and there is no model that predicts that," Kelley said. "It's totally new and unexpected physics."
This "new" physics, the researchers contend, is tied up in counter-rotating eddies with extreme energy. Once the water vapor got caught up in these eddies, the water traveled very quickly -- close to 300 feet per second.

source

300' x 60 x 60 = 1,080,000' per hour

1,080,000/5280' = 204.54 mph.

In a day, therefore, this water vapor could have traveled 4,909 miles.

Makes sense, I guess.