By Debarati Roy Bloomberg January 28, 2011 Coffee futures surged to a 13-year high on signs that supplies from Colombia, the world’s second- largest producer, may be shrinking. Colombia’s National Federation of Coffee Growers said the harvest in Antioquia, the largest producing region, may drop below last year’s levels after excessive rainfall. Before today, futures jumped 77 percent in the past 12 months as adverse weather reduced global crops. “There is a production deficit, and we hear that several coffee traders and brokers are demanding higher prices from companies,” said George Kopp, a senior market analyst at International Futures Group in Chicago. “Also, there is technical buying.” Arabica coffee for March delivery advanced 6.6 cents, or 2.8 percent, to $2.4355 a pound at 9:54 a.m. on ICE Futures U.S. in New York. Earlier, the price reached $2.4635, the highest since June 1997. The commodity may rise to $2.50 should the settlement top $2.42, Kopp said. Brazilian ...