I am an enthusiast for analyzing fx options markets which can sometimes tell you what could happen in forex markets before big moves actually occur.

Do you remember Aug 12th 2013 when there was a biggest 2 day drop in spot price of gold in last 33 years?!?

Looking at trading charts for spot gold or gold futures and even fx pair XAU/USD nothing could predict such sigma 5 event to happen BUT analyzing options market there was a trading signal just 1 day earlier that gold is set for a big drop.