The S&P opened Friday well above Thursday's close and within the first couple of hours plummeted to its lowest of the day, ending 462 basis points below its open. It closed with a 0.08% daily and 0.30% weekly loss.
The U.S. Treasury puts the closing yield on the 10-year note at 2.21%.
Here is a daily chart of the S&P 500. Today's selling puts the volume exactly at its 50-day moving average.
A Perspective on Drawdowns
Here's a snapshot of record highs and selloffs since the 2009 trough.
Here is a more conventional log-scale chart with drawdowns highlighted.
Here is a linear scale version of the same chart with the 50- and 200-day moving averages.
A Perspective on Volatility
For a sense of the correlation between the closing price and intraday volatility, the chart below overlays the S&P 500 since 2007 with the intraday price range. We've also included a 20-day moving average to help identify trends in volatility.