ATR Spikes

Volatility Spike Indicator (ATR based)
I read some of Adam Grimes' work and found he uses a tool called sigma spikes, his concept is to mark significance to daily bars that have returns over x standard deviations of a 20 period average of returns.
I have adapted this idea for intra day trading. I've used an ATR and marked significance to any bar with a range greater than 4 standard deviations of the ATR, this results in attention being drawn to bars with strong momentum behind them and often results in strong follow through.
Additionally, I have included a MA crossover (fast/slow) filter to the indicator, this removes any signals that are counter- short term trend/momentum.

This is a powerful tool for momentum traders as it clearly shows points when the market has significant volatility.