Lumber Is Soaring - Timber? http://stockcharts.com/articles/chartwatchers/2018/05/lumber-is-soaring---timber.html While new highs are typically followed by new highs, this chart is clearly in blue-moon territory or rarified air. StockCharts has $LUMBER data going back to 2006. A look over the past suggests caution. In the lowest panel I have shown the PPO with a (1,40) setting. This calculates the difference between the current weekly moving average of 1-week (Friday's close) with the 40-week moving average. The price accelerated fast back in the spring of 2010. However, within a few weeks it was a rather quick transition. Notice all the extremes in price movement were quickly reversed once they started. With three recent RSI thrusts above 70, this also suggests some caution based on history.