https://rumble.com/vsnure-donald-j.-trump-rally-in-florence-arizona-11522.html
https://www.newsmaxtv.com/trumprally (click the LIVE button)
This is a volcano. The visual difference would be a flash of light and hot ball of gas in the center.
Both are dangerous to aircraft.
newsmax has one but doesn't present a direct link.
>https://www.newsmaxtv.com/trumprally (click the LIVE button)
In that case, you usually get significant steam, cloud size varying on depth, instead of smoke
You can see all of these on youtube you know.
> it was underground? (not exactly familiar with the subject
Yes. Underground doesn't get very high into the atmosphere. There are dozens of these videos on youtube.