Short bars on the S&P 500 retracement are a bullish sign, respect of short-term support at 1450 would suggest a strong advance.
The ASX 200 is strengthening in sympathy, despite poor performance of Chinese markets. Breakout above 4400 would strengthen the primary up-trend signal, from rising 63-day Twiggs Momentum. Follow-through above 4450 would confirm.
* Target calculation: 4450 + ( 4450 – 4000 ) = 4900