With California and the rest of the Southwest still reeling from the extreme heat that shattered hundreds of records last week, the Northwest is now bracing for a sweeping multi-day heat wave that could be the region’s worst in 12 years.

About 13 million people were under heat alerts across Washington, Oregon, California, Nevada, Idaho and Montana on Thursday, with that number expected to grow.

A strong area of high pressure is expected to build in Western Canada this weekend, causing the jet stream to track far north and allow extremely hot air to engulf the Pacific Northwest. Temperatures are already forecast to be several degrees above average Thursday across the Northwest, and highs will only rise Friday through Tuesday. The dangerous heat will cause temperatures to soar 25-35 degrees above average, including for locations like Portland and Seattle.


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