Upwardly moving markets or stocks all eventually move up into overbought conditions. Then ... they cool down in order to let some of the steam off.

How do you measure the steam level? One way is to look at a very short term Relative Strength reading. On a daily chart, I personally like to look at an RSI of 3.

The chart below shows a RSI 3 chart going back to last August. I drew a horizontal red dotted line across the RSI where it was at a level of 84 or higher. Traditionally, a reading of 70+ is regarded as an overbought condition. An 84+ reading is an extreme overbought reading.

If you follow the red vertical lines, you can see that each 84+ RSI reading had an intra-day pull back the next day, or shortly thereafter.

What was the RSI 3 reading on the S&P 500 during the last two days?

It was 88.21 on Friday's close, and then 82.53 on a pullback at yesterday's final close. If the market had seen a strong pull back yesterday, it would have dissipated a lot of that overbought level. It didn't ... so the market remained with an extreme RSI level again yesterday. That now leaves the S&P with more steam to blow off in order to reach an equilibrium level on the RSI.

RSI (Relative Strength Indicator) tools like this are helpful indicators for investors. However, they should be used in conjunction with other indicators to take into account the trending movement's profile and important Red Flag divergences that tell more of the story. (A more extensive RSI 3 study with an additional indicator can be found on our paid subscriber site today.)