Maybe tornados form from landspouts or gustnados that get pulled into the mesocyclone. Is there some way to look for a correlation between number of tornados on a given day and how conducive conditions are to producing gustnados or landspouts?
Edit: We all know how severe storms form. But some severe storms produce tornados and some dont. Nobody knows why. I am suggesting that maybe the reason some dont is because conditions at that time were not conducive to producing landspouts or gustnados. It might be possible to look at the statistics and see if that is the case. If so then that might help forecasters to predict when tornados are more likely to form.
Edit2: A gustnado is a short-lived, shallow surface-based vortex which forms within the downburst emanating from a thunderstorm. The name is a portmanteau by elision of "gust front tornado", as gustnadoes form due to non-tornadic straight-line wind features in the downdraft (outflow), specifically within the gust front of strong thunderstorms. As these eddies very rarely connect from the surface to the cloud base, they are very rarely considered as tornadoes.
Landspouts are a type of tornado which forms during the growth stage of an ordinary cumulus congestus cloud
Edit3: changed dust devil to landspout