Droughts and floods will get worse as global warming occurs, according to the to government experts associated with the United States Climate Science Program. The joint effort on the part of more than a dozen government agencies indicate that heat waves and heavy downpours are very likely to further increase in frequency and intensity. According to the experts, hurricane wind speeds, rainfall intensity and storm surge levels are likely to increase. The strongest cold season storms are likely to become more frequent, with stronger winds and more extreme wave heights. A senior scientist at the National Center for Atmospheric Research expressed there has been a trend toward increasing power in hurricanes since the 1970s in the Atlantic and western Pacific. He believes that change can be linked to rising sea surface temperatures.