Welp, yesterday's recap gave a good warning for what happened today.  The trend table went from about 2/3 red

 to almost all red

and the one box that's yellow could actually be red because the Nasdaq-100 is slightly below its 50-day moving average.  

More clear signs of an ugly day, here are some of the top signals triggered:

Also, the "% of Stocks Above Their 50-Day Moving Averages" is approaching the low 20s.  Once it gets there the market is always under a lot of stress.  That's an area where it's probably too late to sell for anyone with an intermediate to long term focus.   I also know that when the trend table is all red it's a time to look for buying opportunities and when it's all green that's a time to think about locking in long-side gains.

And in the Strength Scans for Expansion Breakout and for Expansion Pivot Buy setups a grand total of one (1).