Ocean water temperatures around the U.K. and Ireland are over 9 degrees Fahrenheit (5 degrees Celsius) above long-term averages for this part of the year, sparking concerns of marine life die-off later this year.
Satellite measurements show that the unexpected marine heatwave hit particularly hard around the northeastern coast of the usually cool Scotland and northwestern Ireland. Similar extremes have been detected in the Baltic Sea off the coast of Germany and Poland.
