Dollar's erratic rise from last week's 15-year low at 84.72 is seen as a minor correction and reckon intra-day upside would falter below 86.89 and yield decline, however, below 85.18 is needed to signal downtrend has resumed, 84.94, then re-test of 84.72.  
On the upside, above 86.89 may risk stronger retracement toward 87.41/46.