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Record Heatwave Hits US West: Climate Change Amplifies Risks

3/21/2026

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Summary

Story summary

A record-breaking heatwave is hitting the US West, with temperatures 20 to 30 degrees above norms.
The National Weather Service reports 110F in Arizona and 108F in California, breaking records.
Scientists say this heat is "virtually impossible" without climate change, which has made such events four times more likely.
The heat poses risks to vulnerable populations and prompts warnings to stay hydrated and limit outdoor activities.

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Story summary

A record-breaking heatwave is hitting the US West, with temperatures 20 to 30 degrees above norms.
The National Weather Service reports 110F in Arizona and 108F in California, breaking records.
Scientists say this heat is "virtually impossible" without climate change, which has made such events four times more likely.
The heat poses risks to vulnerable populations and prompts warnings to stay hydrated and limit outdoor activities.