A slump in the final hour Thursday turned most major market indexes from green to red, although the Dow Jones industrial average hung on to a tiny gain. The Nasdaq fell 0.2% and the S&P 500 dropped 0.1% in the stock market today. Volume on both exchanges ended considerably lighter than Wednesday’s action, according to preliminary data. After the close, Nordstrom (JWN) was higher. It reported Q2 earnings excluding items of 93 cents a share vs.