This summer’s first heatwave has developed across the eastern half of the United States with most places having recorded their hottest temperature of the year so far on Sunday, which will then probably be beaten on Monday and Tuesday.
High pressure across the eastern US has funnelled up hot air from southern parts of the the country, resulting in what is known as a heat dome, initially across central regions on Friday, before spreading eastwards over the weekend. The temperatures rose significantly on Saturday, with Huron regional airport in South Dakota recording a high of 39.4C (102.9F), 13C above the average high in June for the region.
