The Wall Street firm believes the U.S. economic data is poised to continue to deteriorate, threatening the market's bull run.
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The near-term outlook suddenly looks precarious for a stock market near all-time highs.
August was very good for Wall Street. September is shaping up to be the opposite.
September is typically the worst month of the year for the market.
Investors are cautious heading into what's historically the worst month for equities, as big challenges lie ahead.
Even after a positive August, historical performance suggests the coming weeks could be challenging.
Wall Street may want to go to sleep and wake up when September ends.
