SPX made a marginal lower low yesterday as expected and then rallied back into main resistance at the daily middle band, which closed yesterday at 2158/9, with the 5dma and 50 hour MA slightly above in the 2161/2 area. SPX closed a handle above the middle band but in practical terms I count a close less than two handles away from the band as a close on it.
One thing you often see in this kind of situation is a kind of symmetry where unusual setups can repeat several times in a short period and we might have a situation like that here. The last two times that the middle band was tested SPX gapped through it and at the open today SPX has gapped through it again. Both of the last two gaps were breakaway gaps that did not fill that day or the day after. We may see that again today and, if so, that would be a strong start to the ATH retest that we are expecting. SPX daily chart:



