In the U.K., the Met Office has issued a level three amber alert, warning people to stay out of the sun this week, particularly during the hottest hours of the day.

?????????BREAKING NEWS - it's the #hottestdayoftheyearsofar with 33.3 °C recorded at Santon Downham in Suffolk ????????? pic.twitter.com/wMsPfCvAsx

— Met Office (@metoffice) July 23, 2018

The Met Office alert lasts until 9 a.m. on Friday morning. The agency published guidelines on how to prevent overheating:

\"Stay out of the sun. Keep your home as cool as possible –- shading windows and shutting them during the day may help. Open them when it is cooler at night. Keep drinking fluids.\"

\"PHOTO:
Getty Images
PHOTO: Beachgoers gather on West Wittering Beach during hot weather, July 23, 2018, in Chichester, England.
>

The heat wave, which has included the U.K.'s highest temperatures in 50 years, has also extended through northern Europe.

Blistering temperatures and an ongoing drought has turned fields dry and brown from Poland and Latvia to Finland and Sweden.

Many European farmers are dipping into their winter food supplies already. They have also warned that crop yields and milk quality will be lower due to the lower quality of the grass.

\"PHOTO:
Mats Andersson/EPA via Rex/Shutterstock
PHOTO: The burnt out forest around Angra, Ljusdal municipality, after a wildfire ravaged central Sweden, July 22, 2018.
>

In Sweden, temperatures have been the highest in a century, spurring dozens of wildfires, some even inside the Arctic Circle. An international team of firefighters has come together the fight the blazes.

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