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For decades, code devised by Shian-Jiann Lin, a scientist at the National Oceanic and Atmospheric Administration, has powered many of the United States's climate models. Now, his program, which describes with canny accuracy the swirl of air around the globe, will expand into a new domain: the short-term weather forecasts of the National Weather Service. By 2018, Lin's program will power a unified system for both climate and weather forecasting, one that could predict conditions tomorrow, or a century from now. It represents a coming merger between weather and climate scientists, who have discovered common ground in seeking rapid progress on "subseasonal to seasonal" predictions—forecasts from a month to 2 years out.