Look for these 3 bullish catalysts to see a sustained S&P 500 rally as stocks head into their worst month of the year

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• After the August pullback, investors should prepare for the historically bumpy month of September.
• The market hasn't hit the bottom yet, Jeffrey Buchbinder of LPL Financial believes.
• Buchbinder shares 3 signs of a market turnaround and how to invest in the meantime.

After a rocky start to August, the S&P 500 has all but clawed back its losses.

However, LPL Financial's Chief Equity Strategist Jeffrey Buchbinder warns that...