It tells you two things: whether the market is overbought or oversold (the waves pushing into the upper/lower bands), and the turn in momentum (the two waves crossing each other). The blue area between the waves is just a visual cue for how strong/fading that momentum is.
It shines in ranging or choppy markets and for timing entries/exits within a trend — catching short-term reversals and pullbacks. It's a swing-trading and intraday tool more than a long-term one. Its weakness is strong trending markets, where it can sit "overbought" for a long time and fire early signals — so it works best as a timing layer on top of a directional bias from something else (trend, structure, fundamentals).
green (the solid line — the faster, main wave)
red (the dashed line — the slower, smoothing wave)
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