Bearish Signal: Not a Good Day for Market Bellwethers

Daytrends tweets:

Of the "market bellwethers" I follow, $AAPL, $NVDA, $GOOG, $XOM, $JPM are the bottom 5 for today... wow!

I emailed Vic Scherer, the brains behind DayTrends to get a sense for how these bellwethers fit in with the other bellwethers he follows, and what those are bellwethers are. He emailed back:

...lots of ETFs and a few stocks. most of the stocks, surprisingly, were among those listed. a very bearish day.