"Why? Well, according to "renowned trading expert" Larry Williams and his reading of this chart, the end of the month could also mean the end of the rally.

Williams focuses on seasonal patterns of the market to chart his course, noting that July tends to be a bullish month for stocks. So far, it's living up to its historical billing.

CNBC's Jim Cramer highlighted the chart during his "Mad Money" show on Tuesday.

"The charts, as interpreted by the legendary Larry Williams, suggest the S&P could climb another 4% or 5% over the next two weeks, but come July 28, he expects the market to start rolling over," he said. "Given that the expanded unemployment insurance benefits from Washington expire at the end of the month, well, I wouldn't be surprised" if his call turns out to be correct".

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