What an amazing start to the year for yen crosses.

The Australian dollar is the best performer so far in 2013 while the yen is the laggard.

The weekly chart highlights the incredible move since the breakout at the end of November.

These moves are so tempting to chase but the weekly RSI is at its most extreme since 2008.

Eventually, this pair will make it all the way to 104 but the interim volatility will be harsh.