See retrace areas on the chart below, there are two areas into which to look for strength and go long:
- 4260s to 4280s: this is the preferred area, we also have the 7 day weighted moving average in the 4270s.
- A larger retrace could takes to the 4200s - 4230s, an area that has provided resistance recently.
In either case, a small countertrend on the short side could be taken, but I would wait for a confirmation on intraday charts: yesterday's strength was impressive and retraces did not occur even on the smallest timeframes.