That was crazy, I saw one of those before, albeit much weaker, on a hot day in Ft. Stewart, GA. It was quite high, but still weak. It rolled across a hot expanse of black top on a low humidity day. I actually accidentally walked through it because it had formed behind and to the left of me. The wind inside the weak funnel was much stronger than the sustained wind at the time which was only 10-15 mph. I would guess 30-35 or higher.
The vortex in that video was much stronger, I would say low end F0.
Holy sh!t that is one crazy dust devil! That one is easily compared to a F0 tornado.
I've only seen one fair sized DD... it was a few years back, we were camping at Pinery Park on Lake Huron... well we were at the beach, I see this big swirl of dust on the beach parking lot, probably about 4 feet wide, and about 8 feet tall. Well it seemed to have dispeared once it reached the end of the parking lot, but the parking lot is on a steep hill. All of a sudden, my sister is struggling to hold down our chairs, so I run over, the wind was really strong, it was almost difficult to hold the umbrella. Then everything just went dead calm. It was the best DD experience I ever had so far.
You guys need to come out to west Texas. We regularly have dust devils out here that have put many tornadoes I have seen to shame!
I seem to recall Howie Bluestein at the convention comparing tornadoes and dustdevils that although the circulation was smaller and weaker, the vorticity was much the same. I would have to go back and look at the video for the direct quote.