Volatility clustering: quiet begets quiet, wild begets wild

[Amanhasnoname]

Volatility does not arrive randomly. Calm periods tend to follow calm periods, and violent ones follow violent ones. The pattern is called clustering, and it shows up reliably in forex.

For scalpers, it offers a practical tool. If the last hour was unusually quiet, the next is likely quiet too, and ranges will be small, which affects targets and costs. If the last hour was wild, expect more of the same, with wider stops needed.

Using a measure like average true range over the last few hours, compared with its typical value, helps set expectations. A strategy tuned for moderate volatility can be switched off when conditions leave that range.

Many losses come from using the same parameters in every regime. A 3 pip target works nicely in an active market and sits unreachable in a dead one.

Adjusting target and stop to the current volatility, or standing aside, often improves results without changing the core idea.

How is volatility measured in the moment, and how do targets adapt?