Summary
The US west coast is experiencing an unusually early heatwave, with temperatures expected to exceed 100°F in some areas. This heatwave is caused by a strong high-pressure system, affecting millions of people across California, Nevada, and Arizona. Officials have issued heat advisories, warning of health risks and potential impacts on California's water supply and wildfire season.
Key Facts
- Temperatures in Phoenix, Arizona, could reach over 100°F, the earliest in nearly 40 years.
- A heat dome is trapping hot air, causing temperatures 20-30°F above normal.
- The heatwave may last several days, with limited cooling at night.
- Heat advisories are in place for parts of California, including the Bay Area.
- The heat could speed up snowmelt in California’s Sierra Nevada, risking summer water shortages.
- Wildfire risk could increase due to early snowmelt and dry conditions.
- Conditions further east may be more conducive to wildfires because of dry air and steady winds.
- High temperatures are set to extend across much of the US by the end of the week.
