The "S&P 500" rallied so strong with a 1% daily gain four consecutive trading sessions in a row for only 15 times since the "S&P 500" exists according to Bloomberg. The Connors RSI also shows a very high value, last seen last October. And the current trading day (Wednesday) closed at the highs of the session, which will create pivot points which be difficult to exceed one more time.
Therefore a sharp decline for at least one day is possible. Also because I think the fast rally was mostly a short squeeze / short covering rally and less driven by real natural demand from buyers - yet. Maybe next week after some profit taking I see a real strong rally to emerge.
P:S: Here is how rare such a large index move upwards was in recent months, as measured by the Connors RSI. Only three times since Summer 2013:
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Actually when I set the Connors RSI to 93.7 (current value) the current spike up is even more rare, more extreme than last October:
And here more data:
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The current rally is even more rare when adding moving averages in the calculation. Since 2007 this it the SECOND TIME ever that the Connors RSI had such an extreme overbought value while the price is in a bear market below the SMA 50, below the SMA 100 and below SMA 200:
last time the same happened (very high CRSI, price trend below SMAs) was in the first week of October 1981:
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Sorry: I overlooked this event. So it overall happened only three times so far ever. This was the other time in July of 2010, which is also most similar to what I expect will happen in the next days. A slow profit taking decline creating a dip, later followed by a strong rally.