[GGG]

Originally Posted by surferguy

Lafarge Canada ‏@Lafarge_Canada 2m ...dry conditions and cold air resulted in an unusual cloud of dust. This was a routine, permitted effort. #yyc #Calgary


Can anybody comment on the science behind this explanation?

That only explains the muchroom cloud. It doesn't explain the why the shockwave was so powerful which is a function of the size/speed of the explosive. So the blast must have used more explosive than a typical blast.

Or blasts of this size while routine are infrequent enough we don't remember them.