From the Congressional Research Service, this new, 5 page report: Climate Change, Slow-Onset Disasters, and the Federal Emergency Management Agency

The United States is already experiencing certain effects of climate change, including high temperature extremes and heavy precipitation events. The U.S. Global Change Research Program, among other bodies, expects these trends to continue and intensify, likely resulting in more severe and frequent “slow-onset” events (e.g., drought; sea level rise), compound disasters (e.g., extreme rainfall combined with coastal flooding), and cascading events (e.g., mudslides caused by flooding after wildfires). Such events may not have clearly defined start or end dates, and cumulative damage may not be immediately apparent