Sea level rise is causing record-breaking coastal flooding. It's only expected to get worse – even on days without rain.

The nation's coasts are in trouble. After a year of record-breaking coastal flooding, a new report released by the National Oceanic and Atmospheric Administration found that it's going to get more frequent, more intense and more widespread across the U.S. 

High-tide flooding, otherwise known as "king tides" or "sunny day" flooding, has already increased in frequency over the years as sea levels continue to rise. According to NOAA, it typically occurs when tides rise about 2 feet above the daily average and ocean water starts to cascade over streets and bubble up from storm drains. 

This kind of flooding used to really only happen during storms. But now, NOAA says it can happen just from a full moon or a shift in prevailing winds or currents. Decades of sea level rise is to blame and the situation has only been driven by climate change.