
Western US Heatwave Breaks March Records, Study Attributes It to Climate Change
Key Takeaways
- All-time March heat records shattered across Western states.
- Scientists say the heatwave is virtually impossible without climate change.
- Forecast predicts expansion eastward with continued heat through the weekend.
Heatwave Shatters Records
An unprecedented early spring heatwave gripped the western US, shattering March records across eight states.
Four stations recorded 112°F while Martinez Lake reached 110°F—the highest March temperature ever in the US.
The heat dome was the strongest ever observed over the Southwest in March.
Study Links Heatwave to Climate Change
A study concluded the heatwave would have been virtually impossible without human-induced climate change.
The event was classified as a one-in-500-years occurrence in the modern climate.

Heat waves in the western US have grown about 4°C hotter since the industrial era began.
Heatwave Presents Health Risks
The extreme temperatures pose a significant public health threat.
The heat dome is creating stable atmospheric conditions, suppressing precipitation.
Limited overnight cooling and lack of air-conditioning add to heat stress.
Environmental Impacts Loom
The heatwave is expected to accelerate snowmelt in the mountains.
Snowpack levels are already low due to a warm winter.

Environmental consequences could include higher wildfire risk.
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