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Technology and Science20 March, 20261 min read

Western US Heatwave Breaks March Records, Study Attributes It to Climate Change

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All-time March heat records shattered across Western states. Scientists say the heatwave is virtually impossible without climate change.

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Western US Heatwave Breaks March Records, Study Attributes It to Climate Change
Image: Yale Climate Connections

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.

Reporting for this sectionScientific AmericanPhys.orgWorld Weather Attribution

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.

Reporting for this sectionE&E News by POLITICOWorld Weather AttributionPhys.org

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.

Reporting for this sectionWorld Weather AttributionCNN

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.