USD: Looking toppish

Chart 1: USD Index's daily chart as at April 24, 2015 (Source: Stockcharts.com)
The weekly chart below also shows weakness in the uptrend, with MACD just cutting below the MACD signal line and the ADX weakening alongside a declining +DI and a rising -DI. We can see the USD index has been well-supported by the 10-week SMA line since the rally began in July 2014. The 10-week SMA line (currently at 97) will be another important marker to check for the direction of USD index for the next few days or weeks.

Chart 2: USD Index's weekly chart as at April 24, 2015 (Source: Stockcharts.com)
The question is why is USD weakening now. Is it due to technical reason, such as overbought? Or, is it due to economic weaknesses which may delay the much-anticipated monetary tightening in the US? We will have to wait & see.
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