AUDUSD on D1 at 2017.09.13 00:00. The chart shows: that the fast average crossed below the medium average. This sign of short term momentum changing from up to down acts as a possible first sign of trend change from up to down, particlularly if there is an angular ‘elbow joint’ showing on the short term moving average (potential short). Check the strength of the move, whether there has been a turn on strong resistance, a candlestick pattern, or test/restest off the top bollinger band or 20SMA and consider selling.
The chart is attached.