USDJPY stays in the upward price channel on 4-hour chart and remains in uptrend from 100.08. As long as the channel support holds, the uptrend could be expected to continue, and next target would be at 106.00 area. Key support is at 102.81, only break below this level will indicate that the uptrend is complete, then the following downward movement could bring price back to 100.00 zone.
