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US heat wave smothers Pacific Northwest, poses extreme risk in California and Arizona

California preemptively deployed 32 fire engines, 9 water tenders, and 5 helicopters to five counties to mitigate wildfire risks amid extreme heat and dry lightning conditions.

  • About 1.2 million people were under extreme heat risk, with dangerously high temperatures expected to stay high overnight.
  • The largest area under extreme heat warning was around Tucson, Arizona, with forecast highs between 102 and 107 degrees Fahrenheit .
  • In Portland, Oregon, at least one runner lost consciousness during a relay race due to the heat, with the highest heat risk of 2025 forecast for the area.
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FOX 5 San Diego broke the news in San Diego, United States on Saturday, August 23, 2025.
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