The Pacific Northwest's extraordinary heat wave

The Pacific Northwest is experiencing record-high temperatures due to a “heat dome” that should be a once every-few-thousand-year event — but which could occur more often and with more severity due to climate change.

Dan digs in with Axios climate reporter Andrew Freedman, to better understand this weather event's science, the dangers posed to human health and infrastructure, and how the definition of a "normal climate" is changing.

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