Williams Volatility Channel (Full Range Breakout)

Overview
This indicator implements a volatility breakout system inspired by legendary trader Larry Williams. It plots daily breakout levels calculated as the previous day’s close ± the full previous day’s range (high – low). These levels act as extreme volatility expansion thresholds:
- Upper Level: Previous close + previous day’s range
- Lower Level: Previous close – previous day’s range

A price move beyond these levels signals a strong directional breakout driven by expanded volatility — a classic Larry Williams concept for identifying potential trend continuation or acceleration days.
This version uses the full prior range (multiplier = 1.0), making it more aggressive than Williams’ original examples (which often used smaller fractions like 0.25–0.5 × range). It is particularly useful on instruments with clear daily sessions and visible overnight gaps or volatility spikes.

Key Features
Daily breakout levels plotted as horizontal lines that update at the start of each new trading day.
Optional semi-transparent fill between upper and lower levels for better visual channel perception.
Subtle background shading on the first bar of each new day and new week for easier time orientation.
Configurable colors and visibility toggles.
Generic session duration input (informational only) to help estimate candles per day on non-standard markets (e.g., European indices ≈ 8.5h, US stocks ≈ 6.5h, crypto ≈ 24h).

How to Use the Indicator
Breakout Signals
Bullish Breakout: Price closes or sustains above the Upper Level → potential strong upward momentum. Consider long entries or adding to existing longs.
Bearish Breakout: Price closes or sustains below the Lower Level → potential strong downward momentum. Consider short entries or adding to existing shorts.

These breakouts often occur on news events, earnings, or when the market “wakes up” after low-volatility periods.

Trend Confirmation
Use the direction of the breakout to confirm the prevailing trend: In an uptrend, focus primarily on upside breakouts.
In a downtrend, focus primarily on downside breakouts.
Breakouts against the trend can signal potential reversals (use with caution and additional confirmation).

Support & Resistance
Once price has broken a level, that level often flips role: A broken Upper Level can act as support on pullbacks.
A broken Lower Level can act as resistance on bounces.

Risk Management
Place stops beyond the opposite level or use ATR-based stops.
Consider partial profit-taking at 1× or 2× the prior day’s range from entry.

Best Markets & Timeframes
Works well on: Stock indices (DAX, FTSE MIB, CAC, S&P 500 futures, etc.)
Individual stocks
Commodities and futures with defined daily sessions
Cryptocurrencies (adjust session hours to 24 for continuous markets)

Recommended intraday timeframes: 5–60 minutes. On higher timeframes (4H, daily), the levels still appear but are less frequently tested intraday.

Important Notes
This is a trend-following / momentum tool, not a mean-reversion or gap-fading strategy (unlike Larry Williams’ famous “OOPS” pattern).
False breakouts can occur in low-volatility or ranging markets — always use additional confluence (volume, trend filters, higher-timeframe context).
The session duration input is informational and allows definition of how many candles per day should be used in the calculation.

This indicator provides a clean, visually intuitive way to spot high-volatility breakout opportunities based on one of Larry Williams’ timeless volatility concepts. Add it to your charts and combine it with your existing trading system for enhanced entry timing on strong momentum days.