On my 60 min NDX chart at 3:30:  I look at a 60 min PPO 12-26-3 on top, combined with an ADX 7 below it to get a "squeeze pattern". The ADX portion is currently above the 80 line, and the PPO has rolled over slightly to the downside. The ADX above 80 is only the second time it has hit that level in the last 2+ years. The last one occurred right at the start of the move up in Nov of 2016. This combination fits historically as a pretty reliable signal for a potential reversal. One pause, though, to consider,  comes from the "outside event" of the recent tax bill passage, which certainly can skew the normal 2-5  consecutive day RSI-2 patterns that usually occur in my data. Today is a day #5 pattern for the RUT, SPX, and NDX. The election (another outside event) in 2016 helped trigger a 16 day low to high move in the RUT that saw 9 days in a row above 99% for the RSI-2, and concluded with a 100 reading on the 16th day. In 15+ years worth of data that I keep, this length of pattern had never happened before.  

The NDX 60 minute chart also has RSI-14 and RSI-21 levels above the upper line for 3 consecutive days - a rare technical pattern on a historic basis.  On a daily chart, the CCI,20 is right at the +200 level, another piece that has a good track record of warning of a reversal. The daily 20,2 %B indicator is above the upper 1.00 line, and adds to the extreme overbought picture.