OK. Do they have any evidence to support their theory or is it just speculation on a dubious motive? There have been lots of experiments about the weather all with little effect (cloud seeding, e.g.) I'd love to have a weather weapon. I can think of a few place that need debilitating typhoons (Iran & North Korea come to mind)
I'll entertain the idea if they can demonstrate that such technology exists and that the Japanese mob is using it. Otherwise, I'm sticking with the tried and true nuke 'em 'til they glow approach.
All your weather are belong to us.