$S&P 500(.SPX)$ thoughts: Momentum Interruptions. Momentum has been the market's best friend from November through year end. This is being subtly interrupted. In the lower panel of the chart is the Percentage Price Oscillator. This oscillator offers a quick insight into trend momentum. The red dots within the panel signify negative crossover events, a slowdown in momentum. In my analysis, momentum interruption occurs when the initial negative crossover is not succeeded by a corrective price move. Instead, price continues to climb with successive negative crossovers, creating a pattern of interruptions. Based on my observations, the decline that follows such an interruption cycle tends to erase most of the earlier advance. Previous instances ar