Pete Draper has made an 11-part tutorial on creating a tornado using Particle Flow in 3ds Max.
Autodesk 3ds Max 2014 Service Pack 3
Autodesk have released Service Pack 3 for 3ds Max 2014 and 3ds Max 2014 Design.
Take a look at several previews for Project Excalibur, something every 3ds Max should be looking forward to. (Thanks for posting, mushimushi)