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yesterday

Extreme Heat Warnings Expand Across Arizona as Temperatures Rise Toward 120–121°F

The heat dome is pushing power use and public‑health systems to strain and officials say relief should arrive early next week when the dome weakens.

Powerful high pressure will lead to elevated heat risk and record temperatures across the U.S. West on Sunday, Aug. 2. A multitude of cities may break temperatures records for the specific day or the month of the August.
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Overview

  • National Weather Service offices issued Extreme Heat Warnings on July 31 that run through the first days of August for most of Arizona and parts of southern Nevada and southeast California.
  • Forecasters expect afternoon highs generally between 108 and 120 degrees with isolated readings to 121 degrees and little overnight cooling in places such as Phoenix where lows will stay unusually warm.
  • State health officials opened cooling centers and warned people to avoid strenuous outdoor activity as emergency calls and heat‑related illnesses have already risen and at least one hiker died on a South Mountain trail.
  • Arizona utilities reported record peak electricity demand during the heat, increasing the risk of outages and placing extra strain on residents who lack reliable air conditioning.
  • Forecasts show the heat dome weakening around Aug. 3–4, which could bring higher humidity and more storm chances next week but also end the most extreme daytime temperatures.