Similar to forecasting highs, the first step in forecasting a low is in applying Lindsay's 12y interval. The 12y interval stretches 12y, 2m-12y, 8m from an important high.
The next 12y interval is counted from the high in 2004 and points to a low in Apr-Oct 2016.
A decline which begins in the first half of this year will have time to fit Lindsay's rule of thumb which calls for 1yr down followed by 2yrs up; a low in 2016 followed by a high at point J in 2018.
Point J can be higher or lower than point H. If the pattern of alternating long cycles continues (bear, bull, bear bull) the 2002 cycle should see a lower point J.
The end of the long cycle (point A/M) should be roughly 12 years from point D. It forecasts a low in late 2019 or early 2020.