Investment institution BTIG analyst Jonathan Krinsky: U.S. stocks may continue to rise before the end of the year, pushing the S&P 500 index to new highs above 6100 points. However, looking ahead to January, market volatility will reappear. If the S&P 500 index indeed reaches a new high, there will be a significant divergence in breadth and momentum, which is another warning signal as we approach January.