Landspout or Gust Tornado ?

[Damien49]

Thank you for your reports. Concerning the very particular case of this type of vortex and the set of presumptions that are now constituted, I was surprised for a long time that official weather organism such as the noaa were not interested more in this type of event. The explanation in the formation of this type of vortex seems moreover easy enough to explain finally and it is not very surprising that one can find at this precise site of a shelf cloud and in this type of conditions a whirlwind capable of touch the ground. It is neither a gustnado nor a landspout of cold air, nor a shear funnel. It is indeed a new class of tourbillon. In France we decided to call it a tornado of outflow front.

But after looking for a more suitable name and typing gustspout in google, (gustnado + landspout) I was pleasantly surprised to find that this type of vortex had been very recently studied and validated. Maybe I should contact this Matthew Cappucci.

https://ams.confex.com/ams/41BC2WxWarn/webprogram/Paper225816.html

 

[MikeD]

@Damien49, the original and first photo you took looks like hybrid tornado (gustspout), like others have said. No offense, but I think you might have gotten that photo mixed with the one over water.

The one over water looks like a supercellular thunderstorm, with a very definite shelf cloud. Can you maybe give us the unedited photos over water because one of the photos looks like it has a clear slot in the background. I’m thinking low-topped supercell that is in the process of transitioning to a squall line. The supposed tornado over the water picture seems like there is no water being lifted, leading me to think that it is a beaver’s tail or tail cloud. You can almost see the faint HP characteristics.