While the markets opened down in a big way they have been rallying all morning. As of this writing the SPYs are down 3.83%.
The big issue is the last hour or so of trading. If traders are really concerned about any possible bad news that could come out over the weekend, expect heavy volatility and lots of sales.
In addition, there may be some traders who are playing the intra-day gap fade day. That simply means day traders are trading in the opposite direction of the market's open. If that is a big reason why the market is moving higher, then look for possible sales to lock in profits.