Mid November 2017 I detected signals that were pointing to a potential drop of UJ to a value of 100 JPY to the Dollar which would happen as a series of falls over a period of 4 to 6 weeks. Between then and now I have seen numerous interferences to stop the USD from falling and UJ hasn't fallen since then .. yet. March this year it became more obvious that the USD had to make place for other currencies and I suspect the FED started purchasing operations to reposition the USD and avoiding it from losing too much value, see FED implementation note; https://www.federalreserve.gov/newsevents/pressreleases/monetary20180502a1.htm
So technically we already have had a few drops that could be part of the UJ drop to 100 overall process. Today it actually looked again like it would fall substantially and then before London session started, which would definitely kick of the fall, the most brutal purchasing operation ever was started. It lasted for a few hours and sucked away all EU and GU buying pressure so there is none left to complete the final moves. This is a unique situation and it's hard to predict what we can expect next. If it continues it will take the previously predicted 4 to 6 weeks, however I noticed that the fall would be with more force than previously anticipated, that much it could happen in only two weeks time, i.e. from the moment it starts falling.
If UJ falls it may be balanced with a rise of EU or GU. It's a rise and not another fall because the USD sits on the opposite side of the pair name.