Looking at the S&P 500 index, I noticed a convergence approach on two trendlines of resistance: the first one is the trendline established by the general downtrend from October forward (we have, by definition, been beneath it during the downturn of the past six months), and the second is defined by what had been the bottom in November when an uptrend seemed to be taking hold (this uptrend was terminated February 17th).
My conclusion: getting above 850 in the coming weeks looks unlikely.
