Several analysts are warning of a significant downturn in the stock market, particularly for the S&P 500. JP Morgan has projected a 23% plunge in the S&P 500 by the end of the year. Market analyst John Hussman has also cautioned about a major downside for the S&P 500. Additional reports from Citi suggest that stocks are headed for a 'summer squall,' indicating potential short-term volatility. Another analyst has predicted a 30% fall in stocks as the US faces a deep recession, citing elevated valuations as a key factor.