Climate experts at NASA believe they have found a way of forecasting droughts and floods months in advance, the New Scientist magazine reported. The magazine said until now forecasting more than a week ahead had proved impossible because the atmosphere is so unpredictable. But it said NASA's Goddard Space Flight Center in Maryland had located a series of "hotspots" in the middle of continents where changes in the moisture content in soils may signal droughts or floods to come.