Here is a 30 minute bar chart showing the e-mini day sessions for the past week. I am growing more confident that the high volume up move after the Fed announcement was a buying climax (green arrows). This by itself would indicate a several day pause in the up trend. But on the way down from today's high (so far) at 800.50 we saw volume as high as on the way up. (red arrows). If the market stays below 792 I think the odds are good that this is a supply shock. A supply shock in this situation would turn the short term trend down. I would then expect a drop of 50 - 75 points from today's high before a new up trend can start.
I am expecting a daytime range of about 30 points tomorrow, but I can't yet make any estimate for the location of its high and low.