Temperatures in parts of the North Atlantic Ocean are soaring off the charts, with an exceptional marine heat wave happening off the coasts of the United Kingdom and Ireland, sparking concerns about impacts on marine life. According to the National Oceanic and Atmospheric Administration, parts of the North Sea are experiencing a category 4 marine heat wave defined as extreme. In some areas, water temperatures are up to 5 degrees Celsius or 9 Fahrenheit hotter than usual.