Ok, so this needs to be used as a reference for actual modelers to be able to sink there teeth into.
This is not abstract, not a generic picture of particles that fill up the screen.
Think about what a blight storm might look like on the Red Mountain from a distance. Think what would it look like inside it. And remember that these will be physical models, so needs to be specific.
Same with the Ash storms, these come in at you from a distance, foreboding.
A very very hard challenge indeed as its a specific reference for modelers.

sorry for the large link, i
sorry for the large link, i just read about dust storms in alberta during the 30's, and i thought the looming branching effect of the sand and dust was exactly what an approaching ash storm would look like. instead of appearing magically in a point in the air, why not have it roll in slowly from the direction of red mountain. you could see it coming, and it would be a magnificent sight.
https://www.google.ca/search?q=dust+storm+in+alberta+1930&safe=strict&noj=1&site=webhp&tbm=isch&imgil=cDavegSmudpjMM%253A%253B3DDKA68ASJvwqM%253Bhttp%25253A%25252F%25252Fgaltmuseum.blogspot.com%25252F2012%25252F06%25252Fweird-southern-alberta-weather.html&source=iu&pf=m&fir=cDavegSmudpjMM%253A%252C3DDKA68ASJvwqM%252C_&usg=__7XmFtrfFv8dpGU71gng8ozFK4R8%3D&biw=1008&bih=639&ved=0ahUKEwjUkszzk77KAhVKx4MKHVZ3DqUQyjcILw&ei=M4OiVpStCMqOjwTW7rmoCg#imgrc=cDavegSmudpjMM%3A