Generation of heat... [How best to explain. She's already learned that what passes for tech at home is often called magic elsewhere.] Each section of my staff has its own properties that I can combine. This one's the cold one. [She holds the staff section up to show that it's not solid.] The staff itself is hollow. It's...bubble technology, for want of a better word. Here.

[And with a quick shake, a bubble forms at the end of the staff section, before wafting up toward the ceiling. Nami reaches up with a fingernail and pops it, sending a rush of frigid air across the table, just strong enough to ruffle Minato's bangs.]

Heat works the same way. A large introduction of hot or cold air in an area, combine it with wind or moisture, and you can get a lot of effects if you know how pressure systems work.