US STOCKS-Wall St drops on global economic worries
* World Bank cuts global growth forecasts
* JPMorgan falls after earnings
* Freeport McMoRan drops on copper weakness
* Retail sales fall short of estimate
* Indexes off: Dow 1.3 pct, S&P 1.01 pct, Nasdaq 0.71 pct (Updates to market open)
By Chuck Mikolajczak
NEW YORK, Jan 14 (Reuters) - U.S. stocks slumped shortly after the opening bell on Wednesday to extend recent declines, as worries over weak economies globally continued to pressure commodities and as U.S. retail sales for December fell short of expectations.
Copper touched its lowest since July 2009 and were last down 5 percent at $5,571.50 a tonne after the World Bank cut its global forecast for economic growth in 2015 and next year. Shares of Freeport McMoRan Inc lost 9.6 percent to $19.01 as the worst performer on the S&P 500.
Oil prices remained volatile, struggling to find a floor. Brent crude fell to a low of $45.59 before rebounding to trade up 1 percent to $47.06, while U.S. crude was up 1.3 percent at $46.50 after falling as low as $45.01. The Energy Information Administration's oil inventory report is due at 10:30 a.m. EST (1530 GMT). Continuación...