Sabina Ehmann and her daughter Vivian, visiting Seattle from North Carolina, are prepared with umbrellas to shield the sun during a heat wave hitting the Pacific Northwest, Sunday, June 27, 2021, in Seattle. Yesterday set a record high for the day with more record highs expected today and Monday. (AP Photo/John Froschauer)
Sabina Ehmann and her daughter Vivian, visiting Seattle from North Carolina, are prepared with umbrellas to shield the sun during a heat wave hitting the Pacific Northwest, Sunday, June 27, 2021, in Seattle. Yesterday set a record high for the day with more record highs expected today and Monday. (AP Photo/John Froschauer)

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What is a 'heat dome'?

The "heat dome" weather phenomenon can trigger record breaking temperatures.
Source: CNN

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What is a 'heat dome'?

The "heat dome" weather phenomenon can trigger record breaking temperatures.
Source: CNN