4485 is the approximate apex of two short-term trendlines on this daily chart of the SPX.
We'll see whether price makes it up that high, and if so, whether it will hold as resistance.
However, there are a couple of gaps below today's price, so we'll see what happens.
Keep an eye on the Balance of Power indicator for possible clues of gathering strength in either direction.
My post of August 27 provides further details of what I'm also monitoring with respect to the SPX.