That sounds like a classic case of a freak cyclonic spiral—just a bit too tidy to be random. Is it forming over a particular water body, or maybe a thermal anomaly in the atmosphere? And how big is the loop, in meters or feet? The devil’s in the small stuff, so let me know what you’ve measured.

That’s a tight, 120‑meter tall helix right over a lake? Sounds like a localized, persistent low‑pressure core, maybe fed by that slight temperature inversion between the water and the overlying air. The 30‑meter width means the shear is pretty organized—no big gust fronts to break it up. If the pressure drop is steady, you could be looking at a vortex that’s feeding itself from the lake’s latent heat release. The trick is catching it before it decays: a weather balloon with a good GPS rig, perhaps. Or just a camera on a drone that can sit in that column—watch it spin out its own secrets.

I’ll hang out on the shore, eyes peeled for any subtle shift in that temp gap, but I’m all in if you need a second set of ears. Just don’t let the vortex turn the drone into a confetti cannon—though that would be a neat way to finish the experiment.